We're changing our WunderBlogs. Learn more about this important update on our FAQ page.

Unusually cold spring in Europe and the Southeast U.S. due to the Arctic Oscillation

By: Dr. Jeff Masters , 2:52 PM GMT on April 25, 2013

During March 2013, residents of Europe and the Southeast U.S. must have wondered what happened to global warming. Repeated bitter blasts of bitter cold air invaded from the Arctic, bringing one of the coldest and snowiest Marches on record for much of northern Europe. In the U.K., only one March since 1910 was colder (1962), and parts of Eastern Europe had their coldest March since 1952. A series of exceptional snowstorms struck many European locations, including the remarkable blizzard of March 11 - 12, which dumped up to 25 cm (10”) of snow on the Channel Islands of Guernsey and Jersey in the U.K., and in the northern French provinces of Manche and Calvados. The entire Southeast U.S. experienced a top-ten coldest March on record, with several states experiencing a colder month than in January 2013. Despite all these remarkable cold weather events, global temperatures during March 2013 were the 9th warmest since 1880, said NASA. How, then, did such cold extremes occur in a month that was in the top 8% of warmest Marches in Earth's recorded history? The answer lies in the behavior of the jet stream. This band of strong high-altitude winds marks the boundary between cold, polar air and warm, subtropical air. The jet stream, on average, blows west to east. But there are always large ripples in the jet, called planetary waves (or Rossby waves.) In the Northern Hemisphere, cold air from the polar regions spills southward into the U-shaped troughs of these ripples, and warm air is drawn northwards into the upside-down U-shaped ridges. If these ripples attain unusually high amplitude, a large amount of cold polar air will spill southwards into the mid-latitudes, causing unusual cold extremes. This was the case in Europe and the Eastern U.S. in March 2013. These cold extremes were offset by unusually warm conditions where the jet stream bulged northwards--over the Atlantic, the Western U.S., and in China during March 2013. In fact, the amplitude of the ripples in the jet stream reached their most extreme value ever recorded in any March during 2013, as measured by an index called the Arctic Oscillation (AO).


Figure 1. The monthly Arctic Oscillation (AO) index from 1950 - March 2013 shows that three of the six most extreme negative cases have occurred since 2009. Note that all of the six most negative AO indices on record were associated with historic cold waves and blizzards over Europe or the Eastern U.S. Image created using data from NOAA's Climate Prediction Center.

Measuring the jet stream's contortions: the Arctic Oscillation (AO)
One measure of how extreme the ripples in the jet stream are is by measuring the difference in pressure between the Icelandic Low and the Azores High. An index based in this pressure difference is called the North Atlantic Oscillation (NAO). When this index is strongly negative, it means that the pressure difference between the Icelandic Low and the Azores High is low. This results in a weaker jet stream, allowing it to take large, meandering loops. These loops allow cold air to spill far to the south from the Arctic into the mid-latitudes. A more general index that looks at pressure patterns over the entire Arctic, not just the North Atlantic, is called the Arctic Oscillation (AO). The AO and NAO are closely related about 90% of the time. According to a 2010 paper by L'Heureux et al., a strongly negative AO pattern that allows cold air to spill southwards into the mid-latitudes does nothing to the average temperature of the planet. Fluctuations in the jet stream as measured by the AO simply act to redistribute heat. It's kind of like turning off your refrigerator and leaving the refrigerator door open--the cold air from the refrigerator spills out into the room, but is replaced inside the refrigerator by warm room air. No net change in heat occurs. During March 2013, the AO index hit -3.2. Not only was this the most extreme negative March value of the AO since record keeping began in 1950, it was also the sixth lowest AO index ever measured. It was also the first time the AO index had been that extremely negative in a non-winter month (because the circulation patterns are stronger in the winter, we tend to see more extreme values of the AO index in December, January, and February.) This unusual contortion of the jet stream in March 2013 allowed Europe to have exceptional cold weather in a month when the global average temperature was among the warmest 8% of Marches on record. Why did the AO index get so extreme in March 2013? Part of the blame goes to the sudden stratospheric warming event that began in January (wunderblogger Lee Grenci has a detailed post on this event.) Sudden stratospheric warming events tend to push the atmosphere into a more negative AO configuration. Another major factor was the very active Madden Julian Oscillation (MJO), a pattern of increased thunderstorm activity near the Equator that moves around the globe in 30 - 60 days. When the area of increased thunderstorms associated with the MJO is located in the Pacific Ocean, as occurred during much of March 2013, this tends to create negative AO conditions. Finally, wintertime Arctic sea ice loss has been tied to more negative AO patterns, and sea ice was well blow average again during March.


Figure 2. The Arctic Oscillation (AO) is a pattern of varying pressure and winds over the Northern Hemisphere that can strongly influence mid-latitude weather patterns. When the AO is in its positive phase, jet stream winds are strong and the jet stream tends to blow mostly west to east, with low-amplitude waves (troughs and ridges.) Since the jet stream marks the boundary between cold Arctic air to the north and warm subtropical air to the south, cold air stays bottled up in the Arctic. When the AO is in its negative phase, the winds of the jet stream slow down, allowing the jet to take on more wavy pattern with high-amplitude troughs and ridges. High amplitude troughs typically set up over the Eastern U.S. and Western Europe during negative AO episodes, allowing cold air to spill southwards in those regions and create unusually cold weather.

Are jet stream patterns getting more extreme?
We've had some wildly variable jet stream patterns in recent years in the Northern Hemisphere. Just last year, we had a strongly positive AO in March, when our ridiculous "Summer in March" heat wave brought the warmest March on record to the U.S. The first day of spring in Chicago, IL on March 20, 2013 had a high temperature of just 25°F--a 60 degree difference from last year's high of 85°F on March 20! During the past five years, we've set new monthly records for extreme negative AO index for six of the twelve months of the year:

-4.3: February 2010
-3.4: December 2009
-3.2: March 2013
-1.5: October 2009, 2012
-1.4: June 2009
-1.4: July 2009

Note that four of these months with an extremely negative AO occurred in one year--2009. This unusual event was "unprecedented in the 60-year record", according to L'Heureux et al. (2010.) Despite the unusually large negative AO in 2009, the authors found that the AO index between 1950 - 2009 had actually trended to be more positive, in both the winter and annual mean. This is in agreement with what many climate models predict: the AO index should get increasingly positive, due to increasing levels of CO2 in the atmosphere, since this tends to make the stratosphere cool and increase the strength of high altitude winds over the Arctic. However, a number of papers have been published since 2009 theorizing that the record loss of Arctic sea ice in recent years may be significantly altering Northern Hemisphere jet stream patterns (I list eleven of these papers below.) Many of these studies show a link between Arctic sea ice loss and an increasingly negative AO and NAO index in winter. Dr. Jennifer Francis of Rutgers has authored several of these papers, and wrote a very readable explanation of the theory linking Arctic sea ice loss to extreme weather in the mid-latitudes for our Earth Day 2013 microsite. Her post was called, "The Changing Face of Mother Nature." The most recent technical paper connecting Arctic sea ice loss to extreme weather was a March 2013 paper by Tang et al., "Cold winter extremes in northern continents linked to Arctic sea ice loss". The paper argued that unusual jet stream contortions in winter have become increasingly common in recent years. The scientists found a mathematical relationship between wintertime Arctic sea ice loss and the increase in unusual jet stream patterns capable of bringing cold, snowy weather to the Eastern U.S., Western Europe, and East Asia, typical of what one sees during a strongly negative Arctic Oscillation. They theorized that sea ice loss in the Arctic promotes more evaporation, resulting in earlier snowfall in Siberia and other Arctic lands. The earlier snow insulates the soil, allowing the land to cool more rapidly. This results in a southwards shift of the jet stream and builds higher atmospheric pressures farther to the south, which increases the odds of cold spells and blocking high pressure systems that can cause extended periods of unusually cold and snowy weather in the mid-latitudes. The research linking climate change impacts in the Arctic to more extreme jet stream patterns is still very new, and we need several more years of data and additional research before we can be confident that this is occurring. But if the new research is correct, the crazy winter weather we've been seeing since 2009 may be the new normal in a world with rapid warming occurring in the Arctic.


Video 1. Using jet stream animations created by NOAA's Visualiation Laboratory, Dr. Jennifer Francis of Rutgers explains why the jet stream exists, and how the warming of the Arctic may be changing it.

Related posts
"The Changing Face of Mother Nature" by Dr. Jennifer Francis of Rutgers, April 22, 2013.
Why was the start to spring 2013 so cold? by the UK Met Office, April 2013.
Extreme jet stream causing record warmth in the east, record cold in the west (January 2013)
Arctic sea ice loss tied to unusual jet stream patterns (April 2012)
Our extreme weather: Arctic changes to blame? (December 2011)
Florida shivers; Hot Arctic-Cold Continents pattern is back (December 2010)
Jet stream moved northwards 270 miles in 22 years; climate change to blame? (June 2008)
Linking Weird Weather to Rapid Warming of the Arctic by Dr. Jennifer Francis of Rutgers University (March 2012)
From Heat Wave to Snowstorms, March Goes to Extremes by Andrew Freedman of Climate Central (March 2013)

References
L'Heureux, M., A. Butler, B. Jha, A. Kumar, and W. Wang (2010), Unusual extremes in the negative phase of the Arctic Oscillation during 2009, Geophys. Res. Lett., 37, L10704, doi:10.1029/2010GL043338.

Papers published since 2009 that link Arctic sea ice loss to an increase in negative AO or NAO conditions
Deser, C., R. Tomas, M. Alexander, and D. Lawrence (2010), "The seasonal atmospheric response to projected Arctic sea ice loss in the late 21st century," J. Clim., 23, 333–351, doi:10.1175/2009JCLI3053.1.

Francis, J.A., and S.J. Vavrus (2012), "Evidence linking Arctic amplification to extreme weather in mid-latitudes," Geophysical Research Letters, 21 February, 2012.

Francis, J. A., W. Chan, D. J. Leathers, J. R. Miller, and D. E. Veron, 2009, "Winter northern hemisphere weather patterns remember summer Arctic sea-ice extent," Geophys. Res. Lett., 36, L07503, doi:10.1029/2009GL037274.

Honda, M., J. Inoue, and S. Yamane, 2009, "Influence of low Arctic sea-ice minima on anomalously cold Eurasian winters," Geophys. Res. Lett., 36, L08707, doi:10.1029/2008GL037079.

Jaiser, R., K. Dethloff, D. Handorf, A. Rinke, J. Cohen (2012), "Impact of sea ice cover changes on the Northern Hemisphere atmospheric winter circulation", Tellus A 2012, 64, 11595, DOI: 10.3402/tellusa.v64i0.11595

Liu et al. (2012), "Impact of declining Arctic sea ice on winter snowfall", Proc. Natl. Academy of Sciences, Published online before print February 27, 2012, doi: 10.1073/pnas.1114910109

Overland, J. E., and M. Wang, 2010, "Large-scale atmospheric circulation changes associated with the recent loss of Arctic sea ice," Tellus, 62A, 1.9.

Petoukhov, V., and V. Semenov, 2010, "A link between reduced Barents-Kara sea ice and cold winter extremes over northern continents," J. Geophys. Res.-Atmos., ISSN 0148-0227.

Seager, R., Y. Kushnir, J. Nakamura, M. Ting, and N. Naik (2010), "Northern Hemisphere winter snow anomalies: ENSO, NAO and the winter of 2009/10," Geophys. Res. Lett., 37, L14703, doi:10.1029/2010GL043830.

Seierstad, I. A., and J. Bader (2009), "Impact of a projected future Arctic Sea Ice reduction on extratropical storminess and the NAO," Clim. Dyn., 33, 937-943, doi:10.1007/s00382-008-0463-x.

Tang et al., "Cold winter extremes in northern continents linked to Arctic sea ice loss," Environ. Res. Lett. 8 014036 doi:10.1088/1748-9326/8/1/014036

Jeff Masters


The views of the author are his/her own and do not necessarily represent the position of The Weather Company or its parent, IBM.

Reader Comments

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

Viewing: 636 - 586

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13Blog Index

636. Andrebrooks
12:45 PM GMT on May 03, 2013
This can possibly happen.
Member Since: December 31, 1969 Posts: Comments:
634. wunderkidcayman
3:04 PM GMT on April 26, 2013
Hmm looks like we're going to start hurricane season 2013 like we did back in 2007

Subtropical Storm Andrea 2007 (first half of may)

(from wiki.)

Subtropical Storm Andrea 2013 (first half of may)


(from Crown Weather Services)
Member Since: December 31, 1969 Posts: Comments:
633. WunderAlertBot (Admin)
3:03 PM GMT on April 26, 2013
JeffMasters has created a new entry.
632. GeorgiaStormz
3:02 PM GMT on April 26, 2013



NOAA NWS National Hurricane Center

This morning, NHC hurricane specialists Stacy Stewart, Todd Kimberlain and Eric Blake are removing the names, tracks and statistics of the 2012 hurricane season from the large hurricane track map in the NHC operations area. Once done, the names will go up for the 2013 season, which begins in just five weeks.
Do you have your hurricane plan yet?

http://www.nhc.noaa.gov/prepare/
Member Since: December 31, 1969 Posts: Comments:
630. SFLWeatherman
2:52 PM GMT on April 26, 2013
Member Since: December 31, 1969 Posts: Comments:
629. SFLWeatherman
2:52 PM GMT on April 26, 2013
Member Since: December 31, 1969 Posts: Comments:
628. trHUrrIXC5MMX
2:48 PM GMT on April 26, 2013
Quoting SouthernIllinois:
The latest GFS (06Z) is also showing some heavy rainfall amounts for much of the Tennessee Valley down through the Southeastern U.S. into the Carolinas.

Below is the total precipitation amounts from the 06Z GFS out to 96 Hours.

click image to enlarge


Good morning everyone...

I agree with you on this, regardless of development (which I don't expect), this system is a big rainfall maker.

Member Since: December 31, 1969 Posts: Comments:
627. VR46L
2:44 PM GMT on April 26, 2013
The SST low is showing @ WPC day 7

Member Since: December 31, 1969 Posts: Comments:
626. LargoFl
2:36 PM GMT on April 26, 2013
Member Since: December 31, 1969 Posts: Comments:
625. indianrivguy
2:36 PM GMT on April 26, 2013
Quoting Grothar:


Wear a raincoat.


first again... and I "thought" I had you this time.... you ARE the Master.
Member Since: December 31, 1969 Posts: Comments:
624. VR46L
2:32 PM GMT on April 26, 2013
Sweet looking storm in central atlantic

Member Since: December 31, 1969 Posts: Comments:
623. LargoFl
2:29 PM GMT on April 26, 2013
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW
JERSEY...NORTHWEST NEW JERSEY...SOUTHERN NEW JERSEY...EAST CENTRAL
PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

PATCHY FROST IS POSSIBLE LATE TONIGHT INTO EARLY SATURDAY MORNING
IN THE MORE SHELTERED LOCATIONS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

$$
Member Since: December 31, 1969 Posts: Comments:
622. VR46L
2:28 PM GMT on April 26, 2013
Africa Vapour Imagery

Member Since: December 31, 1969 Posts: Comments:
621. LargoFl
2:28 PM GMT on April 26, 2013

FLZ173-280600-
/O.NEW.KMFL.CF.S.0001.130426T0753Z-130428T0600Z/
COASTAL MIAMI DADE-
353 AM EDT FRI APR 26 2013

...MINOR COASTAL FLOODING POSSIBLE ALONG BAY SIDE OF SOUTH
BEACH THROUGH THE WEEKEND...

* COASTAL FLOODING...WATER LEVELS ARE RUNNING AROUND HALF OF A
FOOT ABOVE NORMAL AND MAY LEAD TO MINOR STREET FLOODING AROUND
THE NORMAL HIGH TIDE CYCLES ALONG THE BAY SIDE OF SOUTH BEACH IN
THE TYPICALLY FLOOD PRONE AREAS EXTENDING NORTH FROM 5TH STREET.

* TIMING...AROUND HIGH TIDE...WHICH ARE SCHEDULED EARLY THIS
MORNING AROUND DAYBREAK AND AGAIN THIS EVENING AROUND SUNSET.

* IMPACTS...STANDING WATER ON ROADS ALONG THE BAY SIDE OF SOUTH
BEACH EXTENDING NORTH FROM 5TH STREET. STANDING WATER COULD
LINGER ON STREETS A FEW HOURS PAST HIGH TIDE AND LEAD TO PARTIAL
ROAD CLOSURES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY!

$$
Member Since: December 31, 1969 Posts: Comments:
620. VR46L
2:24 PM GMT on April 26, 2013
Lots of moisture about

Hello Folks

Member Since: December 31, 1969 Posts: Comments:
619. RitaEvac
2:17 PM GMT on April 26, 2013
Wrong handle, uh oh.
Member Since: December 31, 1969 Posts: Comments:
618. yonzabam
2:17 PM GMT on April 26, 2013
Off topic, but I thought this was something that might interest a few of the bloggers on here.

I read an article in the UK Guardian newspaper this morning, by a dsillusioned medical researcher who has come to the conclusion that 'SCIENCE SUCKS', because she can only get very short term contract work, has to keep moving around the country to find it, and can't get funding for her specialist line of research, because there's 'only' a million people who suffer from it. I presume that's globally. The article was titled 'I Am A Research Scientist, And That's Why I Drink'.

Anyway, I'm a bit of a medical research geek myself, and completed a blog on disease causation back in 2010. I post links to it occasionally on the comments sections of relevant medical articles in online newspapers. Usually, I'm lucky if I get half a dozen visits.

I posted the link on the comments section of the above article this morning UK time. About 5 hours later, I've had 100 visits. Here's the breakdown.

UK 73
Germany 4
Spain 3
France 3
Finland 2
Japan 2
USA 2
Ireland 2
Australia 2
Canada 1
Holland 1
Sweden 1
South Korea 1
Austria 1
South Africa 1
Switzerland 1
Member Since: December 31, 1969 Posts: Comments:
617. WXMichael
2:16 PM GMT on April 26, 2013
I'm finally glad to see the pine pollen wrapping up. What a crappy annual occurance that is! Was going to open the pool this weekend, but looking like a deluge on the way Saturday through next week here in Central Savannah River area so maybe postpone one more week.
Member Since: December 31, 1969 Posts: Comments:
616. ncstorm
2:16 PM GMT on April 26, 2013
Quoting RitaEvac:
This is my first post of 2013, good to see everyone

;-)


wrong handle?
Member Since: December 31, 1969 Posts: Comments:
615. RitaEvac
2:14 PM GMT on April 26, 2013
This is my first post of 2013, good to see everyone

;-)
Member Since: December 31, 1969 Posts: Comments:
614. Grothar
2:12 PM GMT on April 26, 2013
Quoting KeysieLife:


It is Prom night after all...

Gro, good to see you're still kicking and screaming!


Hey, we haven't seen you in a long time.
Member Since: December 31, 1969 Posts: Comments:
613. LargoFl
2:10 PM GMT on April 26, 2013
THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST GEORGIA AND
SOUTHEAST SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

MODERATE RISK FOR RIP CURRENTS.

COASTAL FLOODING...THERE WILL BE A RISK FOR SHALLOW COASTAL
FLOODING AROUND THE TIME OF THE EVENING HIGH TIDE FOR THE SOUTH
CAROLINA COASTAL AREAS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

COASTAL FLOODING...THERE WILL BE A RISK FOR SHALLOW COASTAL
FLOODING AROUND THE TIME OF THE EVENING HIGH TIDES INTO EARLY NEXT
WEEK...MAINLY FOR THE SOUTH CAROLINA COASTAL AREAS.

RIP CURRENTS...THERE WILL BE AN ENHANCED RISK FOR RIP CURRENTS AT
AREA BEACHES THROUGH SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ASSISTANCE IS NOT ANTICIPATED AT THIS TIME.

$$
Member Since: December 31, 1969 Posts: Comments:
612. LargoFl
2:08 PM GMT on April 26, 2013
Member Since: December 31, 1969 Posts: Comments:
611. LargoFl
2:04 PM GMT on April 26, 2013
look how much the gulf water has warmed in just a few days..
Member Since: December 31, 1969 Posts: Comments:
610. LargoFl
2:02 PM GMT on April 26, 2013
Member Since: December 31, 1969 Posts: Comments:
609. LargoFl
1:59 PM GMT on April 26, 2013
Miami-Dade County
1
Coastal Flood Statement
Minor Coastal Flooding Possible Along Bay Side Of South Beach Through The Weekend
Coastal Flooding...Water Levels Are Running Around Half Of A Foot Above Normal And May Lead To Minor Street Flooding Around The Normal High Tide Cycles Along The Bay Side Of South Beach In The Typically Flood Prone Areas Extending North From 5Th Street.
Timing...Around High Tide...Which Are Scheduled Early This Morning Around Daybreak And Again This Evening Around Sunset.
Impacts...Standing Water On Roads Along The Bay Side Of South Beach Extending North From 5Th Street. Standing Water Could Linger On Streets A Few Hours Past High Tide And Lead To Partial Road Closures. Precautionary/Preparedness Actions... Do Not Drive Your Vehicle Into Areas Where The Water Covers The Roadway!
Member Since: December 31, 1969 Posts: Comments:
608. GeorgiaStormz
1:56 PM GMT on April 26, 2013
FOR LATE WEEK...THE GFS/EURO CONTINUE TO INDICATE A SUBSTANTIAL COLD
FRONT TO MOVE THROUGH THE REGION. THE ISSUE IS TIMING AS THE GFS IS
FASTER AND HAS THE FRONT MOVING THROUGH EARLY ON THU WHILE THE
SLOWER EURO HAS THE FRONT THU NGT. THERE IS MORE SUPPORT FOR THE
FASTER GFS FROM THE GFS ENSEMBLE ALONG WITH THE EURO ENSEMBLE. I
WANT TO ADD THAT BOTH THE GFS/EURO ARE INDICATING QUITE THE COLD
AIRMASS FOR FRI/SAT. THE LOW LEVEL TEMP ANOMALIES ARE IN THE -4 TO
-5 SIGMA RANGE! AGAIN...IF THIS VERIFIES EXPECT LOW TEMPS IN THE
MID/UPPER 30S AND LIKELY SEVERAL RECORD LOWS BEING SMASHED.
AT THIS
TIME...I DID TREND COLDER FOR FRIDAY.

jackson ms

Member Since: December 31, 1969 Posts: Comments:
607. LargoFl
1:56 PM GMT on April 26, 2013
Member Since: December 31, 1969 Posts: Comments:
606. ARiot
1:55 PM GMT on April 26, 2013
For all of us in the TN Valley, another 1.5 to 2 inches of rain likely in the next 48 or so hours.

Remind your buds not to drive through the water.

Keep the kids away from the creeks.

Enjoy the above average rainfall totals!
Member Since: December 31, 1969 Posts: Comments:
605. washingtonian115
1:55 PM GMT on April 26, 2013
Quoting SouthernIllinois:

You might be in luck, but you may have to wait a few more days. The GFS is pretty certain about you receiving at least an inch further out in the 5 day (120 Hour) outlook.
I'm taking what we can get.The dry pollen has triggered my allergies and when they get really server like they are now my asthma.So I'm leaving for the Doc's office in a few.
Member Since: December 31, 1969 Posts: Comments:
604. KeysieLife
1:49 PM GMT on April 26, 2013
Quoting Grothar:


Wear a raincoat.


It is Prom night after all...

Gro, good to see you're still kicking and screaming!
Member Since: December 31, 1969 Posts: Comments:
602. indianrivguy
1:45 PM GMT on April 26, 2013
Quoting SFLWeatherman:
I have PROM that night!


Make sure you wear your raincoat.. :)
Member Since: December 31, 1969 Posts: Comments:
601. washingtonian115
1:44 PM GMT on April 26, 2013
We need rain here In D.C.The thunderstorms never came through on Tuesday.We need the pollen washed out of the air.I had a thin sheet on my car this morning.Disgusting.
Member Since: December 31, 1969 Posts: Comments:
599. Grothar
1:36 PM GMT on April 26, 2013
Quoting StormTrackerScott:


Is that model still going to replace the GFS in the future?


Still experimental, but it looks like it. It is still posted as GSI-GFS model.
Member Since: December 31, 1969 Posts: Comments:
598. Grothar
1:34 PM GMT on April 26, 2013
Quoting SFLWeatherman:
I have PROM that night!


Wear a raincoat.
Member Since: December 31, 1969 Posts: Comments:
596. StormTrackerScott
1:29 PM GMT on April 26, 2013
Quoting FunnelVortex:
Wow, people must be really pumped up for hurricane season if they are wishcasting a subtrop off of Florida.

I'm actually looking at it too...


We still need rain bad. This would help our drought significantly.

Member Since: December 31, 1969 Posts: Comments:
593. SFLWeatherman
1:27 PM GMT on April 26, 2013
From AccuWeather for WPB!! for May 4 Gusts up to 50MPH!
NW 27 mph
Gusts: 48 mph
Very windy; mainly cloudy with a couple of showers, mainly early in the day
Member Since: December 31, 1969 Posts: Comments:
591. FunnelVortex
1:25 PM GMT on April 26, 2013
Quoting SouthernIllinois:

We're all wishcasting the rain for Florida since it's been so darn dry, but I know what you're getting at! :)


Subtropical, Tropical, or Extratropical, you need a low off of the coast right now.
Member Since: December 31, 1969 Posts: Comments:
589. SFLWeatherman
1:22 PM GMT on April 26, 2013
I have PROM that night!
Quoting Grothar:
Member Since: December 31, 1969 Posts: Comments:
587. FunnelVortex
1:18 PM GMT on April 26, 2013
Wow, people must be really pumped up for hurricane season if they are wishcasting a subtrop off of Florida.

I'm actually looking at it too...
Member Since: December 31, 1969 Posts: Comments:
586. StormTrackerScott
1:16 PM GMT on April 26, 2013
Quoting Grothar:


Is that model still going to replace the GFS in the future?
Member Since: December 31, 1969 Posts: Comments:

Viewing: 636 - 586

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13Blog Index

Top of Page

Category 6™

About

Cat 6 lead authors: WU cofounder Dr. Jeff Masters (right), who flew w/NOAA Hurricane Hunters 1986-1990, & WU meteorologist Bob Henson, @bhensonweather

Ad Blocker Enabled