New USDA Plant Hardiness Zone Map for gardeners shows a warming climate

By: Dr. Jeff Masters , 2:17 PM GMT on February 01, 2012

Share this Blog
32
+

Wintertime minimum temperatures in the U.S. have risen so much in recent decades that the United States Department of Agriculture decided last week to update their Plant Hardiness Zone Map for gardeners for the first time since 1990. The Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones. Compared to the 1990 version, zone boundaries in the new 2012 edition of the map have generally shifted one 5-degree Fahrenheit half-zone warmer than the previous map throughout much of the United States. This is mostly a result of using temperature data from a longer and more recent time period. The old 1990 map was based on temperature data from only a 13-year period of 1974-1986, while the new map uses data from the 30-year period 1976-2005.


Figure 1. Comparison of the 1990 and 2012 USDA Plant Hardiness Zone Maps. Image credit: USDA and Arbor Day Foundation

Northwards, ho!
While humans are generally not attuned enough to nature's rhythms to tell if the climate is changing, plants and animals know the climate is changing. Many species of animals, insects, and plants have shifted their ranges poleward and to higher elevations in recent decades because of global warming. The 2007 IPCC report stated that "numerous studies document a progressively earlier spring by about 2.3 to 5.2 days per decade in the last 30 years in response to climate warming. That report also documented over 400 species that have moved their ranges poleward or to higher elevations because of climate change. For example, conifer trees expanded northwards into former tundra areas at a rate of 12 km per year between 1982 - 2000 in portions of Canada (Fillol and Royer, 2003.) Holly plants moved northwards by several hundred kilometers in recent decades into coastal Norway, Northeast Germany, Denmark, and coastal Sweden in response to warming temperatures (Walther et al., 2005.) As the climate continues to warm, plant and animal species previously unknown in many regions will appear, and will disappear from places they used to inhabit.


Figure 2. Change in the boundary line between conifer forest (taiga) and tundra between 1982 (grey line) and 2000 (white line) over Canada. In the grey box marked "Transect", the rate of northwards migration was 12 km per year, or 228 km (142 miles) in nineteen years. Image credit: Fillol and Royer, 2003, "Variability analysis of the transitory climate regime as defined by the NDVI/Ts relationship derived from NOAA-AVHRR over Canada", Geoscience and Remote Sensing Symposium, 2003. IGARSS '03. Proceedings. 2003 IEEE International.

Jeff Masters

Reader Comments

Comments will take a few seconds to appear.

Post Your Comments

Please sign in to post comments.

or Join

Not only will you be able to leave comments on this blog, but you'll also have the ability to upload and share your photos in our Wunder Photos section.

Display: 0, 50, 100, 200 Sort: Newest First - Order Posted

Viewing: 222 - 172

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8Blog Index

Quoting hurricanehunter27:
Nuclear energy. Solved.
Yeah baby..Fusion reactors by the year 2040. The oceans would provide millions of years worth of energy without the filth...Somethin like this, just a little bigger...he he..
Member Since: September 27, 2007 Posts: 1 Comments: 20489
Quoting hurricanehunter27:
Guess I'm on his ignore list do not sees these posts at all. Anyone want to ask him why for me?


(if u reffer 2 me)your not ignored. because you and some others, it takes alot more then simple arguement to put on ignore. because 96% of the time, you have good posts. others, LIKE TOMTAYLOR, dont.

And tom, you make yourself look reeeeal bad losing your temper like that. its not imature to use ignore. If it was, it wouldnt be there.
Member Since: August 4, 2011 Posts: 46 Comments: 4481
Quoting TomTaylor:
Are you really going to pull that one again?

It's the typical "Oh, I can't think of a good response, in fact, that response was so well though out that I'm just going to resort to simple and unintelligent tactics like accusing smart and passionate posters of having multiple accounts in a feeble attempt to undermine their credibility as a poster."

Xyrus isn't Nea. Furthermore, I respect people like Xyrus and Nea who actually take the time to think out what they are going to say, write in a cohesive and understanding manner, and provide links to back themselves up. When you do what you just did here, Pensacola, you really only discourage well written posts, so please, do us all a favor and grow up.
Guess I'm on his ignore list, do not see the posts at all. Anyone want to ask him why for me?
Member Since: July 22, 2010 Posts: 1 Comments: 3841
10 years ago on the gulf coast of florida around the suwannee river delta, you would hardly ever find a red mangrove. this area was the northern-most limit of the black mangroves, which are common and more cold-tolerant than the red mangrove. now, there's young red mangroves all over the spartina marshes - some are even old enough to flower and drop propagules - even after some hard freezes two years ago, and the black mangroves are slowly moving past the mouth of the suwannee where you never saw them even 5 years ago. the mangroves are moving north.

Member Since: Posts: Comments:
Quoting PensacolaDoug:



Hi Nea.
Are you really going to pull that one again?

It's the typical "Oh, I can't think of a good response, in fact, that response was so well though out that I'm just going to resort to simple and unintelligent tactics like accusing smart and passionate posters of having multiple accounts in a feeble attempt to undermine their credibility as a poster."

Xyrus isn't Nea. Furthermore, I respect people like Xyrus and Nea who actually take the time to think out what they are going to say, write in an easy-to-understand manner, and provide links to back themselves up. When you do what you just did here, Pensacola, you really only discourage well written posts, so please, do us all a favor and grow up.
Member Since: Posts: Comments:
NASA's GCPEx Mission: What We Don't Know About Snow

ScienceDaily (Feb. 1, 2012) — Predicting the future is always a tricky business -- just watch a TV weather report. Weather forecasts have come a long way, but almost every season there's a snowstorm that seems to come out of nowhere, or one that's forecast as 'the big one' that turns out to be a total bust.

In the last ten years, scientists have shown that it is possible to detect falling snow and measure surface snowpack information from the vantage point of space. But there remains much that is unknown about the fluffy white stuff.

"We're still figuring out how to measure snow from space," says Gail Skofronick-Jackson, a specialist in the remote sensing of snow at NASA's Goddard Space Fight Center, Greenbelt, Md. "We're where we were with measuring rain 40 years ago."

Link
Member Since: Posts: Comments:
216. Skyepony (Mod)
95P is overland..
Member Since: Posts: Comments:
Member Since: Posts: Comments:
214. Skyepony (Mod)
Member Since: Posts: Comments:
NASA Mission Returns First Video from Moon's Far Side



South pole of the far side of the moon as seen from the GRAIL mission's Ebb spacecraft. (Credit: NASA/Caltech-JPL)

ScienceDaily (Feb. 1, 2012) — A camera aboard one of NASA's twin Gravity Recovery And Interior Laboratory (GRAIL) lunar spacecraft has returned its first unique view of the far side of the moon. MoonKAM, or Moon Knowledge Acquired by Middle school students, will be used by students nationwide to select lunar images for study.

GRAIL consists of two identical spacecraft, recently named Ebb and Flow, each of which is equipped with a MoonKAM. The images were taken as part of a test of Ebb's MoonKAM on Jan. 19. The GRAIL project plans to test the MoonKAM aboard Flow at a later date.

To view the 30-second video clip, visit: http://go.nasa.gov/zZXAPs .

In the video, the north pole of the moon is visible at the top of the screen as the spacecraft flies toward the lunar south pole. One of the first prominent geological features seen on the lower third of the moon is the Mare Orientale, a 560-mile-wide (900 kilometer) impact basin that straddles both the moon's near and far side.

The clip ends with rugged terrain just short of the lunar south pole. To the left of center, near the bottom of the screen, is the 93-mile-wide (149 kilometer) Drygalski crater with a distinctive star-shaped formation in the middle. The formation is a central peak, created many billions of years ago by a comet or asteroid impact.
Member Since: Posts: Comments:
Radar is also filling in quickly...hasnt rained yet.
Member Since: August 4, 2011 Posts: 46 Comments: 4481
My handheld anemometer came in today that was ordered for my birthday(last thursday) works GOOOOD. Guide says its VERY accurate at low to mid windspeeds, but too much time in high windspeeds will reduce accuracy.


I plan on taking this intrument up to the side of the road overlooking a highway by about 30 feet, no trees within 400 yards, and measure a bow echo. Guess i will have to get wet sometimes...lol.
Member Since: August 4, 2011 Posts: 46 Comments: 4481
Quoting wxmod:


Powerful argument and it bodes not well for the world. The people who are working on turning the situation around are indeed part of the problem, as are all the rest of us. Thanks.
Nuclear energy. Solved.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
Member Since: Posts: Comments:
207. wxmod
Quoting theamoeba:
When the president moves away from talking about climate change and talks more generally about energy, as he did in the State of the Union, calling for an all-out, all-of-the-above strategy that develops every available source of American energy, the impact is more than just political.

It just might get him re-elected. All talk about 'the left this' and 'the right that' discounts the fact that none of these folk elected themselves. If the discussion is moving in the "energy" direction, it's because that's where the discussion leaders think that the votes are. Our votes. That points the mirror, and the blame, squarely where they belong. At you and me.

I work at a lab where climate change and ocean acidification are major components of the work. The parking lot is full of cars, every day. I rest my case.


Powerful argument and it bodes not well for the world. The people who are working on turning the situation around are indeed part of the problem, as are all the rest of us. Thanks.
Member Since: Posts: Comments:
Day 2 Storm Prediction Center Categorical Outlook:



Day 2 Storm Prediction Center Probabilistic Outlook:



DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1123 AM CST WED FEB 01 2012

VALID 021200Z - 031200Z

...THERE IS A SLGT RISK OF SVR TSTMS OVER THE SOUTHERN PLAINS...

...OK/TX...

SIGNIFICANT INCREASE IN MID LEVEL FLOW WILL DEVELOP WITHIN THE BASE
OF TRANSITORY WRN U.S. TROUGH LATE TONIGHT. LATEST MODEL GUIDANCE
SUGGESTS STRONG H5 FLOW...ON THE ORDER OF 60-70KT...WILL OVERSPREAD
NM/TX SOUTH PLAINS BY 02/12Z WITH MAIN CORE OF JET EXPECTED TO
EXTEND INTO WRN OK BY SUNSET. IN RESPONSE TO THIS FEATURE...LLJ
WILL FOCUS OVER NWRN TX INTO WRN OK...INCREASING MARKEDLY DURING THE
EVENING HOURS TO VALUES OF 50-60KT. NET RESULT WILL BE FOR NWD
EVOLVING WARM FRONT TO REPOSITION ITSELF NEAR THE RED RIVER...WWD TO
A WEAK SFC LOW OVER THE TX SOUTH PLAINS BY PEAK HEATING. THIS WILL
SERVE AS THE PRIMARY CORRIDOR FOR LATE AFTERNOON/EVENING
THUNDERSTORM DEVELOPMENT.

LATEST MODEL GUIDANCE SUGGESTS 50S SFC DEW POINTS WILL SURGE NWWD AS
WARM FRONT RETURNS INTO SRN OK/NWRN TX...WITH NEAR 60 DEW POINTS
POSSIBLY RETURNING TO REGIONS WELL EAST OF DRYLINE PRIOR TO TSTM
ACTIVITY. 12Z NAM IN PARTICULAR SUGGESTS A NARROW ZONE OF STRONG
BOUNDARY LAYER HEATING WILL OCCUR ACROSS THE TX SOUTH PLAINS INTO
PORTIONS OF NWRN TX. IF LAPSE RATES STEEPEN AS THE NAM SUGGESTS
THEN CONVECTIVE INHIBITION WILL BE REDUCED AND SFC PARCELS WILL
REACH THEIR CONVECTIVE TEMPERATURES...WHICH APPEAR TO BE NEAR 70.
GIVEN THE LARGE SCALE FORCING/SHEAR EXPECTED IT WOULD SEEM
REASONABLE TO EXPECT ISOLATED SUPERCELLS TO INITIATE NEAR/JUST SOUTH
OF THE WARM FRONT ALONG THE ADVANCING DRYLINE AROUND 22-00Z. WITH
TIME WARM ADVECTION WILL ALSO DRIVE ELEVATED CONVECTION NORTH OF THE
WARM FRONT ACROSS THE ERN TX PANHANDLE INTO WRN/CNTRL OK. ALTHOUGH
SFC DEW POINTS ARE EXPECTED TO REMAIN MOSTLY IN THE MID-UPPER 50S
WITHIN THE INITIATING ZONE...RELATIVELY LOW TEMP/DEW POINT SPREADS
SUGGEST CLOUD BASES WILL BE REASONABLY LOW AND ISOLATED TORNADOES
CAN NOT BE RULED OUT IF DISCRETE SUPERCELLS EVOLVE. HOWEVER...THE
PRIMARY SEVERE THREAT SHOULD BE LARGE HAIL WITH UPWARD EVOLVING
THUNDERSTORM CLUSTERS...ESPECIALLY ALONG/NORTH OF WARM FRONT. THIS
ACTIVITY WILL OVERSPREAD MUCH OF WRN/CNTRL OK BY 03/12Z.

..DARROW.. 02/01/2012

Day 3 Storm Prediction Center Categorical Outlook:



Day 3 Storm Prediction Center Probabilistic Outlook:



DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0218 AM CST WED FEB 01 2012

VALID 031200Z - 041200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF THE SRN
PLAINS...

...SRN AND CNTRL PLAINS...
AN UPPER-LEVEL LOW IS FORECAST TO MOVE EWD INTO THE CNTRL HIGH
PLAINS FRIDAY AS A 60 TO 75 KT MID-LEVEL JET ROUNDS THE ERN SIDE OF
THE LOW INTO THE SRN AND CNTRL PLAINS. THUNDERSTORMS MAY BE ONGOING
AT THE START OF THE PERIOD ALONG AN AXIS OF INSTABILITY FROM NORTH
TX NWD INTO SRN KS. A MARGINAL HAIL THREAT COULD EXIST WITH STORMS
THAT HAVE ACCESS TO MODERATE INSTABILITY. DURING THE DAY...THE
MODELS MOVE THE CONVECTION EWD ACROSS KS AND INTO ECNTRL OK WITH A
SWD EXPANSION INTO CNTRL AND EAST TX. THE MODELS ARE IN FAIRLY GOOD
AGREEMENT CONCERNING THIS SCENARIO BUT THE MAIN UNCERTAINTIES
INCLUDE TIMING THE EWD PROGRESSION OF THE SYSTEM AND GAGING HOW FAR
NORTH STRONG STORMS WILL DEVELOP.

FORECAST SOUNDINGS FRIDAY AFTERNOON SUGGEST THE BEST ENVIRONMENT FOR
SEVERE STORMS WILL EXIST ACROSS NORTHEAST TX WHERE MLCAPE VALUES ARE
FORECAST IN THE 1200 TO 1500 J/KG RANGE WITH 0-6 KM SHEAR AROUND 50
KT. FORECAST SOUNDINGS AT DALLAS CONVECT USING SFC-BASED PARCELS
SUGGESTING A WIND DAMAGE THREAT MAY EXIST. AN ISOLATED LARGE HAIL
THREAT MAY ALSO BE PRESENT ESPECIALLY IF SUPERCELLS CAN ORGANIZE.
THE HAIL THREAT COULD EXTEND NNWWD ALONG THE INSTABILITY AXIS INTO
NCNTRL OK AND SRN KS WHERE COLD AIR ALOFT IS FORECAST IN THE CORE OF
THE UPPER-LEVEL LOW. HOWEVER...THE HAIL THREAT IN THE CNTRL PLAINS
SHOULD BE KEPT MARGINAL DUE TO WEAK INSTABILITY AND ONGOING
PRECIPITATION THROUGHOUT THE DAY. FURTHER TO THE SOUTH...CONVECTIVE
COVERAGE SHOULD DECREASE WITH SWD EXTENT IN AREAS SOUTH OF DALLAS
WHERE LARGE-SCALE ASCENT IS FORECAST TO THE LIMITED.

..BROYLES.. 02/01/2012
Member Since: July 6, 2010 Posts: 113 Comments: 31430
Link

More Than 70 Die In Egyptian Football Riot

12:21am UK, Thursday February 02, 2012
At least 74 people have been killed and 1,000 injured after a football pitch invasion in Egypt, according to reports.

Clashes are said to have broken out as fans flooded the field seconds after the game in the northern coastal city of Port Said finished.

There were reports of rocks, bottles, flares and fireworks being thrown as politicians in the country criticised a lack of security at the match.

Doctors treating the victims said some had been stabbed to death. One player caught up in the rioting described it as "a war".

Troops have now been deployed on the streets and dozens of people have been arrested.

Port Said, Egypt

One player likened the scenes in Port Said to 'war'

Witnesses said most of the deaths involved people who had been trampled in the crush of panicked crowds, or who fell from terraces.

Deputy health minister Hesham Sheiha told state television: "This is unfortunate and deeply saddening. It is the biggest disaster in Egypt's soccer history."

Member Since: Posts: Comments:
203. sunlinepr


If History of Earth's Volcanic and geological past is a indicator of what could happen..I'd pay close attention to her signals from deep inside that Molten Iron-Nickel core.

Member Since: Posts: Comments:
Powerful energy release emanating from the Earth’s core recorded?

Posted on February 2, 2012
February 2, 2012 – TURKEY – The International Geodynamic Monitoring System, a part of GNFE (London, UK), has registered on November 15, 2011 a powerful energy release emanating from the Earth’s core. The intense three-dimensional gravitational anomaly was almost simultaneously recorded by all ATROPATENA geophysical stations separated by vast distances from each other in the following cities: Istanbul (Turkey), Kiev (Ukraine), Baku (Azerbaijan), Islamabad (Pakistan) and Yogyakarta (Indonesia). According to GNFE President Professor Elchin Khalilov, the detailed analysis of ATROPATENA station records indicates a powerful energy release emanating from the Earth’s core. According to the scientist, this fact may herald intensification of geodynamic processes in our planet and as a result, a higher number of strong earthquakes, volcanic eruptions and tsunamis. As GNFE President Professor Elchin Khalilov told WOSCO news agency, ATROPATENA earthquake forecasting stations record particular three-dimensional gravitational anomalies that occur, on average, 3-7 days before strong earthquakes. These anomalies are generated by the passing of tectonic waves (stress waves) under the stations; they are emitted by the focuses of imminent large earthquakes at the moment when the stresses in them reach critical values. These waves travel very slowly, their velocity ranging from an average of 30 km/h on the continents up to 120 km/h in the oceanic crust. The stress waves are of low frequency and their period ranges from several hours to two days on average, making it impossible for seismic stations to detect them. Of course, the ATROPATENA stations record the passing of these waves with a large time difference, which helps monitor their movement and, with quite high accuracy, calculate the location of the epicenter area of the expected earthquake. –Geochange Journal
Member Since: Posts: Comments:
201. caneswatch
12:40 AM GMT on February 02, 2012
Quoting KoritheMan:


Sex, booze, and campfire stories.

Or at least I do.


I do as well, at least with the campfire stories.
Member Since: October 8, 2008 Posts: 14 Comments: 4553
200. hurricanehunter27
12:37 AM GMT on February 02, 2012
Quoting HRinFM:
have to remember this dude is laid back and chilling and dont need to worry about spell and gram, you know hes layed back, Child, please, momma needs to whip your ass
I would change that comment ASAP.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
199. washingtonian115
12:34 AM GMT on February 02, 2012
Quoting HRinFM:
have to remember this dude is laid back and chilling and dont need to worry about spell and gram, you know hes layed back, Child, please, momma needs to whip your ass
Really...
Member Since: August 14, 2010 Posts: 10 Comments: 16383
197. Tropicsweatherpr
12:30 AM GMT on February 02, 2012
Only 120 days left for the 2012 Atlantic Hurricane Season to start. It seems far away but time goes fast and without noticing,the season will be upon us.

Link
Member Since: April 29, 2009 Posts: 75 Comments: 13995
196. TropicalAnalystwx13
12:29 AM GMT on February 02, 2012
Today's unexpected severe weather reports:

Member Since: July 6, 2010 Posts: 113 Comments: 31430
195. Xyrus2000
12:29 AM GMT on February 02, 2012
Quoting westernmob:


CFC's have nothing to do with atmospheric CO2 content. Ultraviolet Radiation and Greenhouse Gases are independent of one another.


While CFCs don't affect CO2 content, they are indeed a greenhouse gas. Their destruction of ozone also ends up increasing warming, but it is minor in comparison to their primary effect.

Like CO2, CFCs stay in the atmosphere for a long time. If they weren't banned due to their destructive effects on the ozone, we'd also be seeing more warming as a result of them.
Member Since: October 31, 2009 Posts: 0 Comments: 1448
194. CybrTeddy
12:26 AM GMT on February 02, 2012
Quoting washingtonian115:
The first pic is rather hilarious.My wife is on here more through the May-Nov period.I should expect the same this season.She said it can be pretty wild through that time(May-Nov).That's when people go mad??


Last season it was so wild that people threw their keyboards through the computer screen during Irene.
Member Since: July 8, 2005 Posts: 259 Comments: 23565
193. washingtonian115
12:25 AM GMT on February 02, 2012
Well I see my husband was trying to introduce himself and check it out around here.Looks like he made an account but warns that he will be on once in a while.Lol.
Member Since: August 14, 2010 Posts: 10 Comments: 16383
192. hydrus
12:12 AM GMT on February 02, 2012
Quoting AlwaysThinkin:


Toenail collections and Burt Bacharach. On a loop. Endlessly.
Man, you need ta quit it...lol
Member Since: September 27, 2007 Posts: 1 Comments: 20489
191. hurricanehunter27
12:12 AM GMT on February 02, 2012
Quoting washingtonian115:
Well no wonder my wife calls that the "survival season".Nice meeting some of you all.Good night.My wife is going to be back on soon.
I hope you enjoyed your stay.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
190. hydrus
12:11 AM GMT on February 02, 2012
Quoting hurricanehunter27:
What in gods name is coming off the Pacific?
Its not as bad as it looks. It is small low pressure areas rotating around a really big low. The Aleutian Low I think.
Member Since: September 27, 2007 Posts: 1 Comments: 20489
189. AlwaysThinkin
12:10 AM GMT on February 02, 2012
Quoting washingtonian115:
This is washingtonian115's husband.What do you people discuss/do on here? I just had to get on for one night and see.


Toenail collections and Burt Bacharach. On a loop. Endlessly.
Member Since: August 9, 2011 Posts: 0 Comments: 394
188. washingtonian115
12:05 AM GMT on February 02, 2012
Quoting WxGeekVA:


Sometimes. May-Nov is Troll Season....
Quoting hurricanehunter27:
We are all already mad. What goes on in that period of time you mentioned (May-Nov) is just the climax of it all.
Well no wonder my wife calls that the "survival season".Nice meeting some of you all.Good night.My wife is going to be back on soon.
Member Since: August 14, 2010 Posts: 10 Comments: 16383
187. Xyrus2000
12:02 AM GMT on February 02, 2012
Quoting htszp:
When I read this blog post, I was really interested to check Google Earth to see how drastically the landscape had changed in Canada. I fully expected to verify what's in this "Northward Expansion of Trees..." map.

Either their methodology for drawing the map is bad or the map is just terrible.

First, there are places that OBVIOUSLY have been forested for quite a long time, but are shown on the map as only gaining trees since 1982 as a result of climate change. Does anyone really think that the parts of the Côte-Nord region of Quebec next to the Saint Lawrence had no trees before 1982. Look at the following locations:
50.43510° N, 64.40846° W
51.95261° N, 62.86960° W
50.67476° N, 64.59611° W
51.31422° N, 58.47182° W
Numerous photos around these areas show that these trees form thick, fully-developed forests. And considering the growth rates of these types of trees in these cold climates, many of these trees must be at least 50 years old. If there is any truth to their map, they must have used an incredibly liberal definition of treeline.

Second, there are some areas which still show up as completely tundra, both from satellite pictures and from recent photographs.
64.512887° N, 101.361422° W appears to me to be within the 2000 treeline, but pictures from the area show complete tundra.

A quick Google search would have clued the authors in to the fact that their analysis methods, or baseline, or something was incorrect.

If the data was only good for their transect, they should have just published that ... and then written another paper for another transect ... and so forth.

Publishing a map like this destroys their credibility.


Your making a false assumption. It doesn't take 50 years for conifer forest to grow. Depending on the type of conifer, the growth rates vary between 1 and 2 feet per year. So you can easily get a full forest within 15 years, let alone 30.

The other assumption you are making is that google earth has recent high res imagery of everywhere on the globe. This is not the case. Underpopulated areas aren't updated nearly as frequently, with some areas being 3 to more then ten years old, imagery wise.

For example, your location for showing tundra vs. trees demonstrates this point exactly. That area only has low res imagery available, making it imposible to tell anything other than the blobby mass of pixels is green. There is no way you can discern one way or another whether it is tundra or trees, though the green may imply trees.

So your arguments don't hold up to scrutiny. Besides, there's no way the could have used Google Earth, since the paper was published in 2003. What they probably used instead were survey maps and fly overs to verify the tree line growth, which is a lot more scientifically valid.
Member Since: October 31, 2009 Posts: 0 Comments: 1448
186. WxGeekVA
12:00 AM GMT on February 02, 2012
Quoting washingtonian115:
The first pic is rather hilarious.My wife is on here more through the May-Nov period.I should expect the same this season.She said it can be pretty wild through that time(May-Nov).That's when people go mad??


Sometimes. May-Nov is Troll Season....
Member Since: September 3, 2011 Posts: 13 Comments: 3468
185. hurricanehunter27
11:59 PM GMT on February 01, 2012
Quoting washingtonian115:
The first pic is rather hilarious.My wife is on here more through the May-Nov period.I should expect the same this season.She said it can be pretty wild through that time(May-Nov).That's when people go mad??
We are all already mad. What goes on in that period of time you mentioned (May-Nov) is just the climax of it all.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
184. hurricanehunter27
11:57 PM GMT on February 01, 2012
Do we have any Redditers on this blog? If so tell me.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
183. washingtonian115
11:57 PM GMT on February 01, 2012
Quoting CybrTeddy:


Dec - May.


May - Nov.
The first pic is rather hilarious.My wife is on here more through the May-Nov period.I should expect the same this season.She said it can be pretty wild through that time(May-Nov).That's when people go mad??
Member Since: August 14, 2010 Posts: 10 Comments: 16383
182. WxGeekVA
11:56 PM GMT on February 01, 2012
Quoting washingtonian115:
This is washingtonian115's husband.What do you people discuss/do on here? I just had to get on for one night and see.


In order of commonness: Climate, Religion, Politics, Weather, and last but not least Chuck Norris.

Quoting CybrTeddy:


Dec - May.


May - Nov.


This about sums it up.
Member Since: September 3, 2011 Posts: 13 Comments: 3468
181. hurricanehunter27
11:53 PM GMT on February 01, 2012
Quoting CybrTeddy:


Dec - May.


May - Nov.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
180. washingtonian115
11:52 PM GMT on February 01, 2012
Quoting KoritheMan:


Sex, booze, and campfire stories.

Or at least I do.
Oooooookay...I quickly scanned the comments on here after I posted the comment and it would seem more like a weather/climate blog.My wife laughs sometimes and I wonder why.I see nothing on here as of now to laugh at.Seems some people were in serious discussion.
Member Since: August 14, 2010 Posts: 10 Comments: 16383
179. CybrTeddy
11:50 PM GMT on February 01, 2012
Quoting washingtonian115:
This is washingtonian115's husband.What do you people discuss/do on here? I just had to get on for one night and see.


Dec - May.


May - Nov.
Member Since: July 8, 2005 Posts: 259 Comments: 23565
178. hurricanehunter27
11:49 PM GMT on February 01, 2012
Quoting washingtonian115:
This is washingtonian115's husband.What do you people discuss/do on here? I just had to get on for one night and see.
Hard to explain. Well 50% weather, 30% general science, 10% politics & religion. 10% disagreeing. Sounds about right.
Member Since: July 22, 2010 Posts: 1 Comments: 3841
177. KoritheMan
11:48 PM GMT on February 01, 2012
Quoting washingtonian115:
This is washingtonian115's husband.What do you people discuss/do on here? I just had to get on for one night and see.


Sex, booze, and campfire stories.

Or at least I do.
Member Since: March 7, 2007 Posts: 553 Comments: 19890
176. hurricanehunter27
11:46 PM GMT on February 01, 2012
Only in Canada...

Member Since: July 22, 2010 Posts: 1 Comments: 3841
175. washingtonian115
11:45 PM GMT on February 01, 2012
This is washingtonian115's husband.What do you people discuss/do on here? I just had to get on for one night and see.
Member Since: August 14, 2010 Posts: 10 Comments: 16383
174. SPLbeater
11:36 PM GMT on February 01, 2012
92S...going downhill i believe

Member Since: August 4, 2011 Posts: 46 Comments: 4481
173. SPLbeater
11:33 PM GMT on February 01, 2012
Quoting hurricanehunter27:
Lol, I stated to you previously that I know your not. "want fun on this blog, then talk about the weather or something atleast related to it." You should really listen to your own advice. I have nothing against you at all was just trying to mess with you a little.


Ok then. thank you for not blowing up like the others :D
Member Since: August 4, 2011 Posts: 46 Comments: 4481
172. SPLbeater
11:32 PM GMT on February 01, 2012
Quoting TropicalAnalystwx13:
Tracking a confirmed tornado on the ground:



where at?
Member Since: August 4, 2011 Posts: 46 Comments: 4481

Viewing: 222 - 172

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8Blog Index

Top of Page

About

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