The Biggest Control Knob: CO2 in Earth's Climate History

By: Dr. Jeff Masters , 9:05 PM GMT on March 24, 2010

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It's been a busy past two months of weather and climate change news, and I haven't found time to blog about the research presented at December's American Geophysical (AGU) meeting in San Francisco. That is the world's largest scientific conference on climate change, and the place to be if you want to get the pulse of the planet. The keynote speech at the AGU meeting was given by Dr. Richard Alley of Penn State University. Dr. Alley is the Evan Pugh Professor of Geosciences at the Pennsylvania State University, and one of the most respected and widely published world experts on climate change. Dr. Alley has testified before Congress on climate change issues, served as lead author of "Chapter 4: Observations: Changes in Snow, Ice and Frozen Ground" for the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), and is author of more than 170 peer-reviewed scientific articles on Earth's climate. He is also the author of a book I highly recommend--The Two Mile Time Machine, a superb account of Earth's climate history as deduced from the 2-mile long Greenland ice cores. A standing-room only audience of over 2,000 scientists packed the lecture hall Dr. Alley spoke at, and it was easy to see why--Alley is an excellent and engaging speaker. I highly recommend listening to his 45-minute talk via a very watchable recording showing his slides as he speaks in one corner of the video. If you want to understand why scientists are so certain of the link between CO2 and Earth's climate, this is a must-see lecture.


Figure 1. Dr. Richard Alley of Penn State University, delivering the keynote speech at the 2009 AGU conference on climate change.

The Biggest Control Knob: CO2 in Earth's Climate History
Earth's past climate has been shaped by a number of key "control knobs"--solar energy, greenhouse gas levels, and dust from volcanic eruptions, to name the three main ones. The main thrust of Dr. Alley's speech is that we have solid evidence now--some of it very new--that CO2 has dominated Earth's climate over the past 400 million years, making it the climate's "biggest control knob". Dr. Alley opens his talk by humorously discussing a letter from an irate Penn State alumnus. The alumnus complains that data of temperatures and CO2 levels from ice cores in Antarctica don't match:

"CO2 lags Earth's temperature...This one scientific fact which proves that CO2 is not the cause of recent warming, yet...Dr. Alley continues to mislead the scientific community and the general public about 'global warming'. His crimes against the scientific community, PSU, the citizens of this great country, and the citizens of the world are significant and must be dealt with severely to stop such shameful activities in the future".

Dr. Alley explains that the irate alumnus is talking about the Antarctic ice core record, which shows that as we emerged from each ice age, the temperature began increasing before the CO2 did, so increased CO2 was not responsible for the warmings that brought us out of these ice ages. Climate change scientists and skeptics alike agree that Earth's ice ages are caused by periodic variations in Earth's orbit called Milankovich Cycles. "There's no doubt that the ice ages are paced by the orbits", says Dr. Alley. "No way that the orbit knows to dial up CO2, and say 'change'. So it shouldn't be terribly surprising if the CO2 lags the temperature change. The temperature never goes very far without the CO2. The CO2 adds to the warming. How do we know that the CO2 adds to the warming? It's physics!"

Dr. Alley then discusses that the physics that govern how CO2 absorbs and re-emits heat energy, when plugged into state-of-the-art climate models, show that about half of the observed 5 - 6°C natural warming that occurred since the last ice age ended was due to extra CO2 added to the atmosphere. At the peak of the Ice Age, CO2 was about 190 ppm. By the end, it was about 280 ppm (Figure 1). Earth's orbital variations "forced" a warming, which caused more CO2 to escape from swamps and oceans, with a time lag of several centuries. The increased CO2 reinforced the warming, to double what it would have been otherwise--a positive feedback loop. "Higher CO2 may be forcing or feedback--a CO2 molecule is radiatively active regardless of how it got there", says Dr. Alley. "A CO2 molecule does not remember why it is there--it only remembers that it is there". In other words, the fact that higher CO2 levels did not trigger an end to the Ice Age does not mean that the CO2 had no warming effect. Half of the the observed 5 - 6°C natural warming that occurred since the last ice age ended was due to the extra CO2 added to the atmosphere. So, the irate PSU alumnus was half right. The CO2 does lag temperature. However, we can only explain approximately half of the warming since the last ice age ended if we leave out the increase in CO2 that has occurred. "If higher CO2 warms, Earth's climate history makes sense, with CO2 having caused or amplified the main changes. If CO2 doesn't warm, we have to explain why the physicists are so stupid, and we also have no way to explain how a lot of really inexplicable climate events happened over Earth's history. It's really that simple. We don't have any plausible alternative to that at this point".


Figure 2. Ice core record from Vostok, Antarctica, showing the near-simultaneous rise and fall of Antarctic temperature and CO2 levels through the last 350,00 years, spanning three ice age cycles. However, there is a lag of several centuries between the time the temperature increases and when the CO2 starts to increase. Image credit: Marian Koshland Science Museum of the National Academy of Sciences: Global Warming Facts and Our Futures, originally provided to that site by Kurt Cuffey, University of California, Berkely.

CO2 and temperatures rise and fall in synch
Dr. Alley continues with a discussion of how CO2 and temperature levels have risen and fallen in synch over most of geologic time. But for many years there was still a mystery: occasionally there were eras when temperature changes did not match CO2 changes. But new paleoclimate research, much of it just in the past two years, has shown that nearly all of these mis-matches were probably due to suspect data. For example, the mismatch in the Miocene Era has significantly improved, thanks to a new study published this year by Tripati et al. Another example occurs during the Ordovician Era 444 million years ago, as discussed in a recent post at the excellent skepticalscience.com blog.


Figure 3. Atmospheric CO2 and continental glaciation, 400 million years ago to the present. The vertical blue bars mark where ice ages have occurred. The length of the blue bars corresponds to how close to the Equator the ice sheets got (palaeolatitude, scale on the right side of the plot). The left scale shows atmospheric CO2 over the past 400 million years, as inferred from a model (green area) and from four different "proxy" fossil sources of CO2 information. This is Figure 6.1 of the Palaeoclimate chapter of the 2007 IPCC report.

Is there anything else we should be worried about?
Dr. Alley continues with a discussion of other influences that may be able to explain global warming, such as volcanos, changes in solar output, and cosmic rays. A whole bunch of the competing hypotheses don't work", says Dr. Alley. "When there's a bunch of big volcanos, they make it cool. If volcanos could get organized, they'd rule the world. There might be a tiny bit of organization due to flexing of the crust, but they're not controlling the world".

Regarding solar changes: "When the sun changes, it does seem to show up in the temperature record. As far back as we can see well, the sun is friendly, it doesn't change much. If the sun changed a lot, it would control things hugely. But it only changes really slowly--as far as we can tell. The record doesn't go back as far as we'd like, and there's work to be done here--but it just doesn't seem to be doing much".


Figure 4. Greenland ice core proxy measurements of temperature (top curve) and cosmic ray flux (bottom curve) for the past 60,000 years. The Earth's magnetic field weakened by 90% 40,000 years ago, for a period of about 1,000 years, but there was no change seen in the temperatures in Greenland.

Regarding cosmic rays: "The sun doesn't change much, but the sun modulates the cosmic rays, the cosmic rays modulate the clouds, the clouds modulate the temperature, and so the sun is amplified hugely. It's really interesting hypothesis, there's really good science to be done on this, but there's reason to think its a fine-tuning knob". He goes on to show an ice core example from a period 40,000 years ago (Figure 4) where the Earth magnetic field had near-zero strength for hundreds of years. This allowed a massive flux of cosmic rays to penetrate to the Earth's surface, creating a huge spike in ice core Beryllium-10, a radionuclide made by cosmic rays. If cosmic rays were important to climate, we would expect to see a corresponding major swing in temperature, but the ice core shows no change during the period of enhanced cosmic ray bombardment 40,000 years ago. "We had a big cosmic ray signal, and the climate ignores it", Dr. Alley comments.

How sensitive is climate to a doubling of CO2?
The IPCC report talks extensively about computer climate models' calculations of "climate sensitivity"--how much Earth's climate would warm if CO2 doubled from pre-industrial levels of 280 ppm, to 560 ppm (we're currently at 390 ppm). A mid-range number from the 2007 IPCC report often used by climatologists is that the climate sensitivity is 3°C for a doubling of CO2. Dr. Alley takes a look at what paleoclimate has to say about the climate sensitivity to CO2. "The models actually do pretty well when you compare them to the past. The best fit is 2.8°C.

Dr. Alley concludes, "Where we really stand now, is, we're not quite at the pound on the table, this story is very clearly not done. But an increasing body of science indicates that CO2 has been the most important controller of global average climate of the Earth."

I'll have a new post Sunday or Monday.

Jeff Masters

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1226. Levi32
4:33 PM GMT on March 29, 2010
Quoting Tropicsweatherpr:
Levi,what do you make of that very warm anomaly east of Masachussetts?



That's mostly representing a warm Gulf Stream flowing southeast of New England. It's been interesting to notice how well the deep currents like the Loop Current and the Gulf Stream have been showing up on the anomaly maps this winter. This means that a lot of the cold water in the gulf and off the SE coast is just shelf water that has been hammered by the cold winter just like everything else, but the deep waters are still quite warm. That means it won't be very hard at all to warm up the gulf and SE US coastal waters.
Member Since: November 24, 2005 Posts: 635 Comments: 26661
1225. Minnemike
4:33 PM GMT on March 29, 2010
new blog :)
Member Since: July 31, 2008 Posts: 0 Comments: 1320
1224. NRAamy
4:32 PM GMT on March 29, 2010
MARCO!!!!!!
Member Since: January 24, 2007 Posts: 317 Comments: 31946
1223. Patrap
4:29 PM GMT on March 29, 2010
TC Paul Rainbow Image




WV Image



Dvorak


Member Since: July 3, 2005 Posts: 426 Comments: 128866
1222. Patrap
4:25 PM GMT on March 29, 2010
Rain at KSC.

NASA - KSC Video Feeds


Member Since: July 3, 2005 Posts: 426 Comments: 128866
1221. Tropicsweatherpr
4:22 PM GMT on March 29, 2010
Levi,what do you make of that very warm anomaly east of Masachussetts?

Member Since: April 29, 2009 Posts: 75 Comments: 14406
1220. StormChaser81
4:15 PM GMT on March 29, 2010
If anybody is in ST. Petersburg, fl. It's free admission to the Indy Car race, but it almost over so hurry.

But 1 min walk from my work and I can hear them from my desk.
Member Since: August 11, 2008 Posts: 0 Comments: 2315
1219. CycloneOz
4:06 PM GMT on March 29, 2010
One of the problems I'll have converting some of these pictures from Carlsbad Caverns is scale. From looking at Photo 1, you cannot tell how really big these formations are.

Luckily, I took a picture of my wife and daughter standing next to one of the formations in the original picture. I resized the family photo to fit the scale of the original...and Wha-La! Scale! Amy and Elena are approximately 5'6" tall.

PHOTO 1 - Without Scale
\

PHOTO 2 - With Scale
Member Since: August 26, 2006 Posts: 10 Comments: 3835
1218. Levi32
4:01 PM GMT on March 29, 2010
Morning all.

These are the sea-level pressure anomalies for the past week. The high pressures in the central Atlantic are a significant deviation from what the entire winter has been like. It is about this time of year, as we get ready to head into April, when we start to come out of winter and watch the patterns to see what the summer may have in store. We will be keeping an eye on things in the Atlantic to see what kind of foreshadowing we may be able to pick up on before the hurricane season starts.

Member Since: November 24, 2005 Posts: 635 Comments: 26661
1217. atmoaggie
3:51 PM GMT on March 29, 2010
I wasn't going to do this at all. I was going to just let it pass.

But little bothers me more than a forecast of uncertain parameters that contains certain words like "will". And a follow up of "I'll remember you next week when..."

So Wednesday of last week we got a forecast here that Gulf of Mexico temperatures "will" warm by 5 - 7 degrees in one week. There *has* been a little warm up along the Atlantic coast of Florida. In the Gulf? Nothing. But we do have 2 days to go before the week will have passed.

This plot covers last Thursday through current:


A lot of movement to do in the next 2 days...or...someone might need to ponder about a new/old adage from Miles Lawrence (NHC): "you should never make a forecast you don't have to make"
Member Since: August 16, 2007 Posts: 6 Comments: 12463
1216. jeffs713
3:47 PM GMT on March 29, 2010
Quoting JRRP:

yeah but a bit colder than days ago

In the GOM and western caribbean, definitely so. The ATL isn't as much of a difference.
Member Since: August 3, 2008 Posts: 16 Comments: 5886
1215. JRRP
3:40 PM GMT on March 29, 2010
Quoting jeffs713:

mmm.. toasty water..

yeah but a bit colder than days ago
Member Since: August 16, 2007 Posts: 0 Comments: 5995
1214. jeffs713
3:33 PM GMT on March 29, 2010
Quoting JRRP:

mmm.. toasty water..
Member Since: August 3, 2008 Posts: 16 Comments: 5886
1213. JRRP
3:27 PM GMT on March 29, 2010
Member Since: August 16, 2007 Posts: 0 Comments: 5995
1212. weathermanwannabe
3:16 PM GMT on March 29, 2010
1211. CycloneOz 11:11 AM EDT on March 29, 2010

Nice pictures & Nice Family..............

Member Since: August 8, 2006 Posts: 0 Comments: 9262
1211. CycloneOz
3:11 PM GMT on March 29, 2010
Hello Everyone! :)

Just got back from Carlsbad Caverns. On our way by car from the caves on Saturday early evening, an earthquake hit just west of our position on the highway. What did we feel? Not much! It was like a cheesy $.25 bed massager that only worked for 3 seconds.

USGS Report on Carlsbad, NM Earthquake of 3/27/2010

Here are a couple of pictures from the trip. In the group picture of me and my family, you can see one of my new GoPro Hero HD video cameras that I'm going to be using this upcoming hurricane season. Look how small it is! :)



Member Since: August 26, 2006 Posts: 10 Comments: 3835
1210. fireflymom
3:00 PM GMT on March 29, 2010
Thank you for the information about the Marsilli Volcano that was one I had no knowledge of.
Member Since: June 5, 2007 Posts: 0 Comments: 588
1209. AwakeInMaryland
2:46 PM GMT on March 29, 2010
Hope everyone has a decent week, despite or in spite of some weather events!

This just appeared on the Yahoo home page -- it's an ABC video piece, "Twisters in South Leave Path of Destruction." Sorry I can't locate embed...anybody savvier than me might be able to do that.

http://cosmos.bcst.yahoo.com/up/player/popup/?cl=18866127
Member Since: August 19, 2008 Posts: 32 Comments: 1918
1207. AussieStorm
2:31 PM GMT on March 29, 2010
Cyclone Paul weather batters tiny Territory communities



Strong winds and heavy rainfall courtesy of Tropical Cyclone Paul have battered the small indigenous community of Umbakumba on Groote Eylandt's east coast.

The category two cyclone is currently near Blue Mud Bay on the east Arnhem Land coast and the weather bureau expects it to move inland over the next 24 hours.

Umbakumba residents are preparing themselves for more wild weather.

A high tide this morning has added to flood levels throughout the area.

Local resident, Nadia Sankovitch said the town's 350 residents were worried about further impacts from Cyclone Paul.

"There is a large hole in the road between Enerogoo and Umbakumba. It is approximately 1.5 metres deep, two metres wide and it spans right across the road," Ms Sankovitch said.

"So we are cut off at the moment form the township of Alyangula.

"The East Arnhem Shire Council has erected warning signs in problem areas.

"The local school will act as an emergency shelter is required.

"I think people are a little bit worried, we have had the shop open this morning so people were able to stock up on things out there.

"So, I think everybody knows that it is coming and we are just waiting to see what happens."

A teacher at a remote school in eastern Arnhem Land said about 90 people have been without power or water since yesterday as a result of the cyclone.

The Yilpara community has taken refuge in the school building overnight to escape heavy wind and rain being unleashed by the category two system.

Wukka Mununggur said storm surges have brought flooding within metres of homes and wind gusts have taken their toll.

"A couple of houses are alright. [In] some areas, toilets are knocked down by the wind and some trees are knocked down," Mr Mununggur said.

The Northern Territory weather bureau says the main impact of Tropical Cyclone Paul is expected to be confined to the Arnhem Land region.

It has remained almost stationary north of Cape Shield off the Territory's east coast.

Senior Forecaster Graham King said unless the system becomes highly unpredictable, the western Top End is unlikely to experience anything other than squally conditions.

"We are just going to have to see how far it drifts once it does cross the coast later today," Mr King said.

"The eastern Top End is certainly going to be very wet in coming days, particularly the coastal regions.

"The Gulf country regions down in the bottom of the Gulf I would say will also get pretty wet at some stage or continue to be wet."

- ABC
Member Since: September 30, 2007 Posts: 9 Comments: 15940
1206. AussieStorm
2:20 PM GMT on March 29, 2010
Colony Collapse Disorder continues in 2009 as bees disappear from US

THE decline in the US bee population, first observed in 2006, is continuing, a phenomenon that still baffles researchers and beekeepers.
Data from the US Department of Agriculture showed a 29 per cent drop in beehives in 2009, following a 36 per cent decline in 2008 and a 32 per cent fall in 2007.

This affected not only honey production but around $15 billion worth of crops that depended on bees for pollination.

Scientists call the phenomenon "colony collapse disorder", and it has led to the disappearance of millions of adult bees and beehives and occurred elsewhere in the world, including in Europe.

Researchers have looked at viruses, parasites, insecticides, malnutrition and other environmental factors but have been unable to pinpoint a specific cause for the population decline.

The rough winter in many parts of the United States will likely accentuate the problem, Jeff Pettis, lead researcher at Department of Agriculture's Bee Research Laboratory in Maryland, said.
Winter figures will be published in April.

But preliminary estimates already indicated losses of 30 to 50 per cent, president of the American Beekeeping Federation David Mendes said.

"There are a lot of beekeepers who are in trouble," he said.

"Under normal condition you have 10 per cent winter losses ... this year there are 30, 40 to 50 per cent losses."

He said the phenomenon probably resulted from a combination of factors but that the increased use of pesticides appeared to be a major cause.

"I don't put my bees in Florida because the last couple of years there has been tremendous increase in pesticide use in the orange crop to fight a disease," he said.

"It's a bacterium and the only way to control this disease is to use pesticide ... a few years ago they did not use any pesticide at all."

Research conducted in 23 US states and Canada and published in the Public Library of Science journal found 121 different pesticides in 887 samples of bees, wax, pollen and other elements of hives, lending credence to the notion of pesticides as a key problem.

Mr Pettis said the finding of pesticide residue was "troubling".

# From correspondents in Maryland
# From: AFP
# March 30, 2010
Member Since: September 30, 2007 Posts: 9 Comments: 15940
1205. AussieStorm
2:14 PM GMT on March 29, 2010
Undersea volcano could destroy Italy 'as soon as tomorrow', expert warns

EUROPE'S largest undersea volcano could disintegrate and unleash a tsunami that would engulf southern Italy "at any time", a prominent vulcanologist has warned.

The Marsili volcano, which is bursting with magma, has "fragile walls" that could collapse, Enzo Boschi told the leading daily Corriere della Sera.

"It could even happen tomorrow," Prof Boschi, president of the National Institute of Geophysics and Volcanology said

"Our latest research shows that the volcano is not structurally solid, its walls are fragile, the magma chamber is of sizeable dimensions," he said.

"All that tells us that the volcano is active and could begin erupting at any time."

The event would result in "a strong tsunami that could strike the coasts of Campania, Calabria and Sicily," Prof Boschi said.


The undersea Marsili, 3000m tall and located some 150km south-west of Naples, has not erupted since the start of recorded history.

It is 70km long and 30km wide, and its crater is some 450m below the surface of the Tyrrhenian Sea.

"A rupture of the walls would let loose millions of cubic metres of material capable of generating a very powerful wave," Prof Boschi said.

"While the indications that have been collected are precise, it is impossible to make predictions.

"The risk is real but hard to evaluate."


# From correspondents in Rome
# From: AFP
# March 30, 2010
Member Since: September 30, 2007 Posts: 9 Comments: 15940
1204. MarcoIsland
2:12 PM GMT on March 29, 2010
Quoting stillwaiting:
marco:up the road here on siesta key w/only picked up 1.28 inches in the last 24hrs....and here comes the sunshine,forecast for sarasota the next 5 days wall to wall sunshine and highs around 75,why I live here;)


yup, love it.
Member Since: May 15, 2009 Posts: 0 Comments: 33
1203. belizeit
2:02 PM GMT on March 29, 2010
Quoting Chicklit:
Yes, this week spring will be in full swing. Our Carribbean friends have not been so lucky. Let's hope they get some rain down there soon!
We are hoping for the best it is very dry and a small shower will not help us any more . We have a cold front moving trough today but the squall line has passed already and we just had a little drizzle pass that amounted to 10 seconds of drizzle . Link
Member Since: January 10, 2010 Posts: 0 Comments: 926
1202. AussieStorm
1:54 PM GMT on March 29, 2010
Just Issued




TROPICAL CYCLONE ADVICE NUMBER 23
Issued by the BUREAU OF METEOROLOGY, DARWIN
at 11:00 pm CST Monday 29 March 2010

A Cyclone WARNING continues for coastal and island communities from Milingimbi
to Numbulwar, including Nhulunbuy and Groote Eylandt.

A Cyclone WATCH continues for coastal and island communities west to Maningrida
and south to Port McArthur.

At 9:30 pm CST Tropical Cyclone Paul, Category 2 was estimated to be 70
kilometres northwest of Alyangula and 160 kilometres south southwest of
Nhulunbuy, moving west southwest at 4 kilometres per hour.

The cyclone is crossing the coast just south of Cape Shield. During Tuesday it
is expected to weaken as it remains over land. Late Wednesday it is likely the
cyclone will move back into Gulf of Carpentaria where it may reintensify.

DESTRUCTIVE WINDS with gusts to 140 kilometres per hour are likely on the coast
near Cape Shield as the cyclone moves inland.

GALES with gusts to 110 kilometres per hour are currently being experienced
between Nhulunbuy and Numbulwar, including Groote Eylandt. GALES may extend
north to Elcho Island and west to Milingimbi during Tuesday if the cyclone takes
a more northerly track. GALES are likely to extend south to Port McArthur or
possibly west to Maningrida late Wednesday, depending on the cyclone's future
movement.

A STORM TIDE is expected between CAPE SHIELD and PORT ROPER. Tides are likely to
rise significantly above the normal high tide, with DAMAGING WAVES and DANGEROUS
FLOODING tonight and Tuesday.

HEAVY RAIN may lead to localised flooding and significant stream rises over the
eastern Top End and northern Roper-McArthur Districts tonight and Tuesday.

Details of Tropical Cyclone Paul at 9:30 pm CST:
.Centre located near...... 13.4 degrees South 136.0 degrees East
.Location accuracy........ within 30 kilometres
.Recent movement.......... towards the west southwest at 4 kilometres per hour
.Wind gusts near centre... 140 kilometres per hour
.Severity category........ 2
.Central pressure......... 982 hectoPascals




Member Since: September 30, 2007 Posts: 9 Comments: 15940
1201. stillwaiting
1:45 PM GMT on March 29, 2010
marco:up the road here on siesta key w/only picked up 1.28 inches in the last 24hrs....and here comes the sunshine,forecast for sarasota the next 5 days wall to wall sunshine and highs around 75,why I live here;)
Member Since: October 5, 2007 Posts: 20 Comments: 4970
1200. taco2me61
1:35 PM GMT on March 29, 2010
Good Morning Everybody,
I sure hope that the Blog will change today because I just can't see myself chatting about "GW".....
Here's a little fact that I see about "GW" & "CC".... We are 8 degrees cooler today than yesterday and we will warm to 15 degrees above that by Friday.... There you go.....

Have A Great Day
:0)
Member Since: July 7, 2005 Posts: 6 Comments: 3261
1199. MarcoIsland
1:32 PM GMT on March 29, 2010
We've had about 3.66 inches of rain fall since 2am this morning.

Link
Member Since: May 15, 2009 Posts: 0 Comments: 33
1198. NEwxguy
1:30 PM GMT on March 29, 2010
Anyone know where I can buy a used ark,need one quick,here in the northeast
Member Since: September 6, 2007 Posts: 883 Comments: 15859
1197. PanhandleChuck
1:24 PM GMT on March 29, 2010
How's everyone doing?

Looking forward to another season of Dr. Masters' blogs and learning more about the tropics. I have learned a lot over the past couple of years from him and numerous members on this site. I just hope the Bozo's stay away (I know fat chance).
Member Since: May 13, 2008 Posts: 0 Comments: 1414
1196. StormChaser81
1:10 PM GMT on March 29, 2010
Wrestling is seriously lame. The fake acting one, not the one in high schools.

I'd rather watch paint dry...lol
Member Since: August 11, 2008 Posts: 0 Comments: 2315
1195. Chicklit
1:00 PM GMT on March 29, 2010
Quoting Skyepony:
I've got 2.02" & it's still coming down. Nice sleeping weather.

I got up early to the sound of rain to work on taxes. Happy Passover. Stay safe out there.
Many roads will be flooded this morning.
Member Since: July 11, 2006 Posts: 14 Comments: 11358
1194. BenBIogger
12:59 PM GMT on March 29, 2010
Member Since: March 19, 2009 Posts: 0 Comments: 1421
1193. help4u
12:57 PM GMT on March 29, 2010
Wrestling,daily apocalypse,ultra man,I love this site!!
Member Since: September 18, 2006 Posts: 0 Comments: 1289
1191. severstorm
12:33 PM GMT on March 29, 2010
Morning all,jeff9641 i got about 1.40 in so far. I see it should be dry for about 2 weeks.
Member Since: November 25, 2007 Posts: 0 Comments: 959
1189. BenBIogger
12:27 PM GMT on March 29, 2010
Member Since: March 19, 2009 Posts: 0 Comments: 1421
1187. KEEPEROFTHEGATE (Mod)
12:20 PM GMT on March 29, 2010
Member Since: July 15, 2006 Posts: 174 Comments: 54622
1186. stormwatcherCI
12:19 PM GMT on March 29, 2010
Quoting Chicklit:
Yes, this week spring will be in full swing. Our Carribbean friends have not been so lucky. Let's hope they get some rain down there soon!
Good morning. We could really use the rain. We have only had 1.14" since the beginning of the year. It is DRY.
Member Since: October 9, 2008 Posts: 0 Comments: 8399
1185. indianrivguy
12:15 PM GMT on March 29, 2010
welll. we have one trying to spin up.. duck and cover!



[Tornado Vortex Signature] C0 62 dBZ 38,000 ft. wow!!47 kg/m 30% chance heavy hail 100% chance hail 0.75 in. 21 knots WSW (247)
Member Since: September 23, 2006 Posts: 1 Comments: 2580
1184. Skyepony (Mod)
12:10 PM GMT on March 29, 2010
I've got 2.02" & it's still coming down. Nice sleeping weather.
Member Since: August 10, 2005 Posts: 178 Comments: 38313
1182. nrtiwlnvragn
12:00 PM GMT on March 29, 2010
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* TORNADO WARNING FOR...
EAST CENTRAL BROWARD COUNTY IN SOUTHEAST FLORIDA...
THIS INCLUDES THE CITIES OF...TAMARAC...SUNRISE...PLANTATION...FORT
LAUDERDALE...DAVIE...

* UNTIL 845 AM EDT

* AT 751 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
INTERSECTION I-75 AND GRIFFIN ROAD...MOVING NORTHEAST AT 30 MPH.

THIS STORM IS ALSO CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE TORNADO WILL BE NEAR...
INTERSECTION I-75 AND GRIFFIN ROAD...
DAVIE...
SAWGRASS MILLS MALL...
SUNRISE...
LAUDERDALE LAKES...
NORTH LAUDERDALE...
AND SURROUNDING COMMUNITIES.
Member Since: September 23, 2005 Posts: 14 Comments: 11222
1181. Tropicsweatherpr
11:59 AM GMT on March 29, 2010
Impressive graphic of those very warm anomalies in the MDR.Also look east of Masachussetts.

Member Since: April 29, 2009 Posts: 75 Comments: 14406
1180. Chicklit
11:44 AM GMT on March 29, 2010
Yes, this week spring will be in full swing. Our Carribbean friends have not been so lucky. Let's hope they get some rain down there soon!
Member Since: July 11, 2006 Posts: 14 Comments: 11358
1179. weathermanwannabe
11:34 AM GMT on March 29, 2010
Good Morning. Drove through some of the rain in Florida from West Palm Beach to Tallahassee yesterday but with the exception of the front exiting US on the Atlantic, and the storms associated with that frontal/low, looking like an awesome Spring week for most of the SE US once the front exits to the Atlantic.....Enjoy the upcoming beautiful weather this week....)
Member Since: August 8, 2006 Posts: 0 Comments: 9262
1178. IKE
11:17 AM GMT on March 29, 2010



Member Since: June 9, 2005 Posts: 23 Comments: 37858
1177. indianrivguy
10:21 AM GMT on March 29, 2010
Morning Gang! unbelievable amount of lightning coming across the glades

Member Since: September 23, 2006 Posts: 1 Comments: 2580
1176. CyclonicVoyage
9:43 AM GMT on March 29, 2010
Morning All.

Statement as of 5:38 AM EDT on March 29, 2010

The National Weather Service in Miami has issued a

* Tornado Warning for...
northwestern rural Broward County in Southeast Florida...
southwestern rural Palm Beach County in Southeast Florida...
east central rural Collier County in southwest Florida...

* until 630 am EDT

* at 536 am EDT... National Weather Service Doppler radar indicated a
severe thunderstorm capable of producing a tornado near Miccosukee
Indian reservation... moving northeast at 25 mph.

This storm is also capable of producing quarter size hail... and
destructive winds in excess of 70 mph.

* The tornado will be near...
Collier/Broward line and Alligator alley...
Miccosukee service Plaza...
intersection Alligator alley and Miami canal...
and surrounding communities.

Member Since: January 30, 2010 Posts: 0 Comments: 3259

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Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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