A dramatic greening of the Arctic over the past 30 years

By: Dr. Jeff Masters , 3:30 PM GMT on March 18, 2013

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A remarkable transformation in the vegetation of the Arctic has occurred over the past 30 years, according to a study of satellite data published on March 10, 2013, in Nature Climate Change. The authors found that Arctic vegetation growth and temperatures in 2011 resembled what occurred 250 - 430 miles farther to the south back in 1982. That's the approximate distance in latitude between San Francisco and San Diego, or Washington D.C. and Atlanta. More greening occurred in Eurasia than North America, and the Arctic's new greenness is visible on the ground as an increasing abundance of tall shrubs and trees. Large patches of vigorously productive vegetation now span a third of the northern landscape, an area about equal to the contiguous United States. "Higher northern latitudes are getting warmer, Arctic sea ice and the duration of snow cover are diminishing, the growing season is getting longer and plants are growing more," said co-author Dr. Ranga Myneni of Boston University's Department of Earth and Environment, in a NASA press release. "In the north's Arctic and boreal areas, the characteristics of the seasons are changing, leading to great disruptions for plants and related ecosystems." The changes in the Arctic's vegetation are being driven by human-caused global warming, which is occurring in the Arctic at more than double the rate of the rest of the planet. This so-called "Arctic amplification" is due, in part, to the increased melting of ice and snow near the pole. When ice and snow melt, they uncover darker surfaces underneath, which absorb more sunlight and increase Arctic temperatures in a vicious cycle which melts even more ice and snow. Using 17 climate models, the researchers predicted that a continuation of warming in the Arctic in coming decades could lead to over a 1300 mile latitudinal shift in Arctic vegetation zones by the year 2100, compared to the period 1951 - 1980. That's a distance greater than the north-south extent of the contiguous United States. However, more frequent forest fires, increased pest outbreaks, and summertime droughts due to a warming climate might slow down Arctic plant growth.


Figure 1. Of the 10 million square miles (26 million square kilometers) of northern vegetated lands, 34 to 41 percent showed increases in plant growth (green and blue), 3 to 5 percent showed decreases in plant growth (orange and red), and 51 to 62 percent showed no changes (yellow) over the past 30 years. Satellite data in this visualization are from AVHRR and MODIS. Credit: NASA's Goddard Space Flight Center Scientific Visualization Studio.


Figure 2. Trees take hold as permafrost thaws near the Altai Mountains in Russia. Credit: Terry Callaghan, EU-Interact/Sergey Kirpotin, Tomsk State University.

Commentary
One often hears complaints that global warming may be greatly overestimated, due to many temperature sensors being located in increasingly urbanized areas where local "urban heat island" effects are not being properly considered. If this were true (and it isn't), then we would not expect to see "nature's thermometers"--plants and animals--change their behavior and ranges much. But plants and animals are responding in major ways to the warming climate, and the greening of the Arctic is merely one more example of "nature's thermometers" telling us that the planet is warming significantly. Some other examples:

Fall is falling back: During 1982 to 1999, the end of the growing season was delayed by 4.3 days in the Northern Hemisphere. During 2000 to 2008, the end of the growing season was further delayed by an additional 2.3 days. In the U.S., fall now occurs ten days later than it did 30 years ago.

Spring is springing forward: Spring events, like bird and butterfly migrations, flower blooming times, and frog mating, have been advancing by about three days per decade over the past 30 years.

Animals are changing migration patterns: New species have colonized previously ‘cool’ regions, including sea anemones in Monterey Bay, and lichens and butterflies in Europe. Over the past 50 years, maximum range shifts vary from 200 km (butterflies) to 1,000 km (marine copepods).

Related blog post: New USDA Plant Hardiness Zone Map for gardeners shows a warming climate

Dr. Myneni's petition to protect Earth from climate change
Professor Myneni of Boston University's Department of Earth & Environment, co-author of the greening Arctic study, has developed a simple one-sentence petition that he hopes one billion people will sign by Earth Day, 2014:

Dear Secretary-General of the United Nations Ban Ki-moon,

We, the People of the Earth, request You to act judiciously and expeditiously to protect the Earth from anthropogenic climate change.

Respectfully,
People of the Earth


The petition, which I have signed, is at: https://yourclimatechange.org/, and was recently featured by Discovery News.

Jeff Masters

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Looks like trouble coming to Georgia... My niece lives in Woodstock... I need to give her a call about the impending weather..
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Jackson, MS hail storm on approach. Wow.

Link
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Well I'm a bit late to get in on this one due to pressing things but I do like this line, from the blog post:-
". However, more frequent forest fires, increased pest outbreaks,"
I'm sure we will be hearing more of this over the next few months or years.
Not only of course are the outbreaks of natural pests in sight but also we must never dscount the human pests who will no doubt strain to the limits of their deluded twisted inteligences to throw us from the path of questing out any new lines that might signifify the direction into which the furure Earths climate may wander!
Apart from that, its been an odd year over here in the homelands, so to speak.
We still have cold to the north and I noted today that Scandanavia is still below freezing in the Stockholm area, along with Moscow and even Iceland is not looking to warm at the moment.
This may signify that the Arctic is litly to become a trifle warmer than the lower latitudes in the forthcoming weeks as the sun is about to rise over its thin icy crust.
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Member Since: April 23, 2011 Posts: 104 Comments: 14869
Rotation is heading straight towards me. I am the little red cross to right.
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000
WFUS52 KFFC 182131
TORFFC
GAC055-115-129-213-295-313-182215-
/O.NEW.KFFC.TO.W.0009.130318T2131Z-130318T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
531 PM EDT MON MAR 18 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* TORNADO WARNING FOR...
NORTHEASTERN CHATTOOGA COUNTY IN NORTHWEST GEORGIA
NORTHEASTERN FLOYD COUNTY IN NORTHWEST GEORGIA
NORTHERN GORDON COUNTY IN NORTHWEST GEORGIA
MURRAY COUNTY IN NORTHWEST GEORGIA
SOUTHERN WALKER COUNTY IN NORTHWEST GEORGIA
SOUTHERN WHITFIELD COUNTY IN NORTHWEST GEORGIA

* UNTIL 615 PM EDT

* AT 525 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A LINE OF SEVERE THUNDERSTORMS WITH TWO AREAS OF ROTATION. ONE IS 2 MILES
NORTHWEST OF CENTER POST AND ANOTHER IS 2 MILES SOUTHEAST OF TRION.
THESE STORMS ARE MOVING EAST AT 60 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CALHOUN...RESACA...DALTON...CHATSWORTH AND ETON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT WILL BE TOO LATE TO GET TO A SAFE
PLACE.

IF YOU SEE WIND DAMAGE...HAIL OR FLOODING...WAIT UNTIL THE STORM HAS
PASSED...AND THEN CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1 8
6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
MONDAY EVENING FOR NORTHWEST GEORGIA.

&&

LAT...LON 3451 8469 3442 8537 3472 8548 3476 8545
3480 8520 3477 8520 3477 8515 3482 8513
3489 8469
TIME...MOT...LOC 2129Z 262DEG 52KT 3460 8524

$$
Member Since: August 19, 2006 Posts: 13 Comments: 13477
TORNADO WARNING
GAC015-057-067-089-117-121-135-223-233-182245-
/O.NEW.KFFC.TO.W.0010.130318T2200Z-130318T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
600 PM EDT MON MAR 18 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* TORNADO WARNING FOR...
SOUTHERN CHEROKEE COUNTY IN NORTH CENTRAL GEORGIA
NORTHERN COBB COUNTY IN NORTH CENTRAL GEORGIA
NORTHWESTERN DEKALB COUNTY IN NORTH CENTRAL GEORGIA
FORSYTH COUNTY IN NORTH CENTRAL GEORGIA
NORTHEASTERN FULTON COUNTY IN NORTH CENTRAL GEORGIA
NORTHWESTERN GWINNETT COUNTY IN NORTH CENTRAL GEORGIA
SOUTHERN BARTOW COUNTY IN NORTHWEST GEORGIA
NORTHERN PAULDING COUNTY IN NORTHWEST GEORGIA
NORTHEASTERN POLK COUNTY IN NORTHWEST GEORGIA

* UNTIL 645 PM EDT

* AT 557 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMA CAPABLE OF PRODUCING A TORNADO NEAR TAYLORSVILLE...
MOVING EAST AT 60 MPH. THERE IS ANOTHER AREA OF ROTATION CAPABLE OF PRODUCING
A TORNADO SOUTHEAST OF BRASWELL.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
EMERSON...ACWORTH...KENNESAW...MARIETTA...WOODSTOC K...HOLLY
SPRINGS...CANTON...MOUNTAIN PARK...SANDY SPRINGS...BUFFINGTON...
ROSWELL...DUNWOODY...ALPHARETTA...MILTON...FREE HOME...NORCROSS...
BERKELEY LAKE...JOHNS CREEK...DULUTH...CUMMING AND SUWANEE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT WILL BE TOO LATE TO GET TO A SAFE
PLACE.

IF YOU SEE WIND DAMAGE...HAIL OR FLOODING...WAIT UNTIL THE STORM HAS
PASSED...AND THEN CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1 8
6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT MONDAY EVENING
FOR NORTHWESTERN GEORGIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 1000 PM EDT MONDAY EVENING FOR NORTHWEST GEORGIA.

&&

LAT...LON 3419 8498 3430 8404 3419 8405 3418 8406
3416 8405 3392 8406 3387 8500
TIME...MOT...LOC 2158Z 262DEG 51KT 3410 8479

$$
Member Since: August 19, 2006 Posts: 13 Comments: 13477
TORNADO WARNING JUST NORTH OF ATLANTA


Member Since: April 23, 2011 Posts: 104 Comments: 14869
Things are about to get interesting for me. I am now under a tornado warning.
Member Since: Posts: Comments:


MESOSCALE DISCUSSION 0280
NWS STORM PREDICTION CENTER NORMAN OK
0457 PM CDT MON MAR 18 2013

AREAS AFFECTED...E-CNTRL AL...WRN GA

CONCERNING...TORNADO WATCH 53...

VALID 182157Z - 190000Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 53 CONTINUES.

SUMMARY...LINE OF TSTMS ACROSS E-CNTRL AL WILL CONTINUE QUICKLY
EWD...MERGING WITH ONGOING SUPERCELLS ACROSS WRN GA. THE OVERALL
TORNADO RISK WILL DECREASE OVER THE NEXT FEW HOURS WITH AN ENHANCED
RISK OF SEVERE HAIL AND WIND DEVELOPING. A DOWNSTREAM SVR TSTM WATCH
WILL LIKELY BE NEEDED ACROSS SE GA.

DISCUSSION...LINE OF SVR TSTMS ACROSS E-CNTRL AL WILL CONTINUE
MOVING EWD WITH INCREASING ACCELERATION AS THE LINE DISCRETELY
PROPAGATES DUE TO MERGERS WITH ONGOING SUPERCELLS ACROSS WRN GA.
RADAR-BASED STORM MOTION ESTIMATES INDICATE THE LINE IS MOVING ESE
AT APPROXIMATELY 50 KTS. SVR WIND GUSTS WERE REPORTED AT ANB AND GAD
IN NW AL DURING THE LAST HOUR. DISCRETE CELLS CONTINUE AHEAD OF THE
LINE BUT IT APPEARS SUFFICIENT TIME FOR ORGANIZATION AND SUBSEQUENT
TORNADO DEVELOPMENT MAY BE WANING DUE TO THE APPROACHING CONVECTIVE
LINE. THE ENVIRONMENT ACROSS THE WATCH AREA REMAINS FAVORABLE FOR
SUPERCELLS WITH EFFECTIVE BULK SHEAR AROUND 50 KTS AND MLCAPE AROUND
1500 J/KG. ALSO...GIVEN THE ADEQUATE LOW-LEVEL MOISTURE AND
SHEAR...TORNADOES ARE STILL POSSIBLE WITH ANY MATURE DISCRETE STORM
OR SUPERCELL LINE MERGERS.

GIVEN THE CURRENT EVOLUTION OF THE OVERALL CONVECTIVE SYSTEM...IT
APPEARS THE LINE WILL MOVE E OF THE WW 53 BETWEEN 23 AND 00Z. AS
SUCH...A DOWNSTREAM SEVERE TSTM WATCH WILL LIKELY BE NEEDED ACROSS
SE GA BEFORE 00Z.

..MOSIER.. 03/18/2013


ATTN...WFO...CHS...CAE...JAX...FFC...TAE...BMX...M OB...

LAT...LON 31858669 34038638 34078338 33408219 31998185 31578429
31858669
Member Since: August 19, 2006 Posts: 13 Comments: 13477

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* TORNADO WARNING FOR...
SOUTHERN CHEROKEE COUNTY IN NORTH CENTRAL GEORGIA
NORTHERN COBB COUNTY IN NORTH CENTRAL GEORGIA
NORTHWESTERN DEKALB COUNTY IN NORTH CENTRAL GEORGIA
FORSYTH COUNTY IN NORTH CENTRAL GEORGIA
NORTHEASTERN FULTON COUNTY IN NORTH CENTRAL GEORGIA
NORTHWESTERN GWINNETT COUNTY IN NORTH CENTRAL GEORGIA
SOUTHERN BARTOW COUNTY IN NORTHWEST GEORGIA
NORTHERN PAULDING COUNTY IN NORTHWEST GEORGIA
NORTHEASTERN POLK COUNTY IN NORTHWEST GEORGIA

* UNTIL 645 PM EDT

* AT 557 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMA CAPABLE OF PRODUCING A TORNADO NEAR TAYLORSVILLE...
MOVING EAST AT 60 MPH. THERE IS ANOTHER AREA OF ROTATION CAPABLE OF PRODUCING
A TORNADO SOUTHEAST OF BRASWELL.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
EMERSON...ACWORTH...KENNESAW...MARIETTA...WOODSTOC K...HOLLY
SPRINGS...CANTON...MOUNTAIN PARK...SANDY SPRINGS...BUFFINGTON...
ROSWELL...DUNWOODY...ALPHARETTA...MILTON...FREE HOME...NORCROSS...
BERKELEY LAKE...JOHNS CREEK...DULUTH...CUMMING AND SUWANEE.
Member Since: February 13, 2012 Posts: 10 Comments: 3268
230. VR46L
Quoting PalmBeachWeather:
Just a sprinkle... Looks like more west of me... And thanks


Hopefully some more will come...

Your Welcome
Member Since: March 1, 2012 Posts: 0 Comments: 6623
Now hailing at Hartsfield-Jackson #ATL Airport. #gawx
Member Since: April 23, 2011 Posts: 104 Comments: 14869
Severe t'storm now arriving at #ATL airport. Gust to 38 mph at 5:52pm. Hail core just a few miles west of the airport, about to strike.

very careful, stay indoors!
Member Since: April 23, 2011 Posts: 104 Comments: 14869
Quoting VR46L:


Glad to see You :)

Get any rain yet?
Just a sprinkle... Looks like more west of me... And thanks
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Quoting Jedkins01:



Hail that size will lead to some massive repairs in the body shop as well. I've seen pictures of hail that size actually puncturing holes in roofs of cars.


indeed, full repair/overhauls.... bigger money...lol

3" hail?
I justs didn't want to take it that far, I have not seen hail in 5 years, can't think on the damage to houses, gardens, cars and buildings...

today is a severe weather (one of few)/snow day! (tired of)
Member Since: April 23, 2011 Posts: 104 Comments: 14869
225. VR46L
Quoting PalmBeachWeather:
Where in Ohio lost?


Glad to see You :)

Get any rain yet?
Member Since: March 1, 2012 Posts: 0 Comments: 6623
Quoting trHUrrIXC5MMX:
Storm with history of golfball hail heading directly twd America's busiest airport, Hartsfield-Jackson in #ATL. HUGE damage potential.

Ground stops at #ATL (severe t'storms) and Newark #EWR (low ceilings/visibility) - no flights taking off or landing.
I can remember when I was a very young girl growing up in Xenia Ohio a terrible hail storm... I can remember the sound almost deafening while it was banging on the cars, the siding, and the roof... Or maybe that was my dear father(RIP) swearing because of the damage he would encounter.... Later on in my life there was a much worse storm I experienced... April 3rd, 1974, at 3:40 pm.
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Quoting trHUrrIXC5MMX:


big money there buying new windshields



Hail that size will lead to some massive repairs in the body shop as well. I've seen pictures of hail that size actually puncturing holes in roofs of cars.
Member Since: Posts: Comments:
Quoting hurricanehunter27:
3.00+ inch hail with some rotation now.


big money there buying new windshields
Member Since: April 23, 2011 Posts: 104 Comments: 14869
3.00+ inch hail with some rotation now.
Member Since: Posts: Comments:
Storm with history of golfball hail heading directly twd America's busiest airport, Hartsfield-Jackson in #ATL. HUGE damage potential.

Ground stops at #ATL (severe t'storms) and Newark #EWR (low ceilings/visibility) - no flights taking off or landing.
Member Since: April 23, 2011 Posts: 104 Comments: 14869
Quoting trumpman84:
If the study's conclusion that the melting of permafrost is causing increased plant growth/coverage, one would expect the results to show a great concentration of the growth in the areas where there was/is permafrost. Since there is also a great increase in areas where there is no permafrost, I am questioning that conclusion.
A close look at the image shows the bluest shading--that is, areas with the greatest plant growth--overlaying the permafrost-covered areas of northern Asia and northern North America. In fact, the bluest shades are almost exclusively found north of 60N.
Member Since: November 8, 2009 Posts: 4 Comments: 13298
The storm headed towards Atlanta is a right-mover. The city isn't going to get the worst of the storm anymore. But don't get me wrong, conditions are still going to get very dangerous.
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Interesting, Atlanta's Temp. is about 55F but just 20 miles or so to the South and East of the city it is in the mid 70's.
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Quoting trHUrrIXC5MMX:


ins't slight below minimal??? I thought minimal was above slight??...never mind.

Simply, I'll just upgrade one level up.
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And this is why it is a good idea to stay indoors when baseball size hail is occurring. Can only imagine how many dents are on that car in the picture.

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MESOSCALE DISCUSSION 0279
NWS STORM PREDICTION CENTER NORMAN OK
0428 PM CDT MON MAR 18 2013

AREAS AFFECTED...EXTREME SERN MS INTO SRN AL

CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON

VALID 182128Z - 182200Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...ORGANIZED STORMS INCLUDING SUPERCELLS AND LINES WILL
DEVELOP SEWD THROUGH SERN MS AND SRN AL NEXT FEW HOURS. VERY LARGE
HAIL AND DAMAGING WIND WILL BE THE MAIN THREATS.

DISCUSSION...ENVIRONMENTAL CONDITIONS HAVE BECOME FAVORABLE FOR
SEVERE STORMS WITH MLCAPE TO 3000 J/KG...8+ C/KM LAPSE RATES AND
STRONG EFFECTIVE SHEAR
. A WATCH ISSUANCE WILL BE COORDINATED BETWEEN
THE SPC AND THE AFFECTED LOCAL NATIONAL WEATHER SERVICE OFFICES
SHORTLY.

..DIAL/THOMPSON.. 03/18/2013


ATTN...WFO...BMX...MOB...

LAT...LON 32138821 31978646 31208630 31078791 31458884 32138821
Member Since: August 19, 2006 Posts: 13 Comments: 13477
Quoting wxchaser97:

Why should I downgrade me risk? Minimal is equivalent to "see text" and slight risk is slight risk of severe weather.


ins't slight below minimal??? I thought minimal was above slight??...never mind.
Member Since: April 23, 2011 Posts: 104 Comments: 14869
Quoting trHUrrIXC5MMX:


Isaac...we had some tornado warnings earlier today, Nashville was in one of them..I think you should upgrade your "slight risk" to "minimal"...at least

Why should I downgrade my risk? Minimal is equivalent to "see text" and slight risk is slight risk of severe weather.
Member Since: Posts: Comments:
Quoting lostinohio:
UNDER THE GUN!
Where in Ohio lost?
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Quoting hurricanehunter27:
Storm you are showing is the monster near Franklin GA south of Atlanta. 3.25 inch hail on that one for a while. Atlanta storm is hovering between 2.00-2.50inch hail.

Woops, I'll edit that.
Member Since: February 11, 2012 Posts: 79 Comments: 7302
please be careful there!!! watch out for red pimples aka possible tornadoes.
Member Since: April 23, 2011 Posts: 104 Comments: 14869
UNDER THE GUN!
Member Since: Posts: Comments:
Quoting Jedkins01:


That kind of hail will punish vehicles...
That would put your eye out kid
Member Since: Posts: Comments:
Quoting Xulonn:
Ah yes, the old CC myth that because "CO2 is plant food" everything will grow better. It ain't quite so simple!

Please read this at Dr. Masters' recommended denier-disproval website, SkepticalScience.com.


Fair enough, but the quote from skeptical science does not deny that increased CO2 is a benefit to plant life if there are no other factors to consider. I just saw the map and thought, "well, it appears there has been an increase in plant life all the way down to the mid-high latitudes."

If the study's conclusion that the melting of permafrost is causing increased plant growth/coverage, one would expect the results to show a great concentration of the growth in the areas where there was/is permafrost. Since there is also a great increase in areas where there is no permafrost, I am questioning that conclusion.
Member Since: Posts: Comments:
Quoting MAweatherboy1:
The Atlanta storm is an epic hail producer, and is strengthening... white echos showing up now:

Storm you are showing is the monster near Franklin GA south of Atlanta. 3.25 inch hail on that one for a while. Atlanta storm is hovering between 2.00-2.50inch hail.
Member Since: Posts: Comments:
THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* TORNADO WARNING FOR...
NORTHEASTERN CHATTOOGA COUNTY IN NORTHWEST GEORGIA
NORTHEASTERN FLOYD COUNTY IN NORTHWEST GEORGIA
NORTHERN GORDON COUNTY IN NORTHWEST GEORGIA
MURRAY COUNTY IN NORTHWEST GEORGIA
SOUTHERN WALKER COUNTY IN NORTHWEST GEORGIA
SOUTHERN WHITFIELD COUNTY IN NORTHWEST GEORGIA

* UNTIL 615 PM EDT

* AT 525 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A LINE OF SEVERE THUNDERSTORMS WITH TWO AREAS OF ROTATION. ONE IS 2 MILES
NORTHWEST OF CENTER POST AND ANOTHER IS 2 MILES SOUTHEAST OF TRION.
THESE STORMS ARE MOVING EAST AT 60 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CALHOUN...RESACA...DALTON...CHATSWORTH AND ETON.
Member Since: February 13, 2012 Posts: 10 Comments: 3268
This storm south of Atlanta is an epic hail producer, and is strengthening... white echos showing up now:

Member Since: February 11, 2012 Posts: 79 Comments: 7302
THAT'S A BIG ONE!!!

Member Since: April 23, 2011 Posts: 104 Comments: 14869
If the shear was there this cell would probably drop a large tornado. Lucky for Atlanta this does not seem to be the case, just large hail. Could change at any moment though.
Member Since: Posts: Comments:
Quoting dogsgomoo:


Aw geeze.. They REALLY don't need more tornadoes going through that area. :|

Unfortunately, that line was just given a tornado warning.

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
531 PM EDT MON MAR 18 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* TORNADO WARNING FOR...
NORTHEASTERN CHATTOOGA COUNTY IN NORTHWEST GEORGIA
NORTHEASTERN FLOYD COUNTY IN NORTHWEST GEORGIA
NORTHERN GORDON COUNTY IN NORTHWEST GEORGIA
MURRAY COUNTY IN NORTHWEST GEORGIA
SOUTHERN WALKER COUNTY IN NORTHWEST GEORGIA
SOUTHERN WHITFIELD COUNTY IN NORTHWEST GEORGIA

* UNTIL 615 PM EDT

* AT 525 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A LINE OF SEVERE THUNDERSTORMS WITH TWO AREAS OF ROTATION. ONE IS 2 MILES
NORTHWEST OF CENTER POST AND ANOTHER IS 2 MILES SOUTHEAST OF TRION.
THESE STORMS ARE MOVING EAST AT 60 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CALHOUN...RESACA...DALTON...CHATSWORTH AND ETON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT WILL BE TOO LATE TO GET TO A SAFE
PLACE.

IF YOU SEE WIND DAMAGE...HAIL OR FLOODING...WAIT UNTIL THE STORM HAS
PASSED...AND THEN CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1 8
6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
MONDAY EVENING FOR NORTHWEST GEORGIA.

&&

LAT...LON 3451 8469 3442 8537 3472 8548 3476 8545
3480 8520 3477 8520 3477 8515 3482 8513
3489 8469
TIME...MOT...LOC 2129Z 262DEG 52KT 3460 8524

$$
Member Since: February 11, 2012 Posts: 79 Comments: 7302
Mini-hurricane.

Member Since: Posts: Comments:
Quoting wxchaser97:
Atlanta is now under severe thunderstorm warning. This storm looks to directly impact Atlanta with golfball size hail.

WUUS52 KFFC 182121
SVRFFC
GAC067-089-097-121-182200-
/O.NEW.KFFC.SV.W.0043.130318T2121Z-130318T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
521 PM EDT MON MAR 18 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTH CENTRAL COBB COUNTY IN NORTH CENTRAL GEORGIA
DEKALB COUNTY IN NORTH CENTRAL GEORGIA
EASTERN DOUGLAS COUNTY IN NORTH CENTRAL GEORGIA
CENTRAL FULTON COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 600 PM EDT

* AT 516 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZED HAIL...AND
DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS CENTERED JUST SOUTHWEST
DOUGLASVILLE...MOVING EAST AT 40 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LITHIA SPRINGS...COLLEGE PARK...EAST POINT...HAPEVILLE...ATLANTA...
MIDTOWN...GRANT PARK-ZOO ATLANTA...DRUID HILLS...DECATUR...AVONDALE
ESTATES...LITHONIA...PINE LAKE...STONE MOUNTAIN AND CLARKSTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE WIND DAMAGE...HAIL OR FLOODING...WAIT UNTIL THE STORM HAS
PASSED...AND THEN CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1 8
6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT MONDAY EVENING
FOR NORTHWESTERN GEORGIA.

&&

LAT...LON 3379 8476 3386 8416 3378 8408 3363 8411
3363 8414 3365 8418 3365 8422 3363 8423
3365 8424 3365 8446 3364 8446 3364 8474
TIME...MOT...LOC 2121Z 265DEG 36KT 3370 8472

$$









Isaac...we had some tornado warnings earlier today, Nashville was in one of them..I think you should upgrade your "slight risk" to "minimal"...at least
Member Since: April 23, 2011 Posts: 104 Comments: 14869
Quoting MAweatherboy1:

Wow, this line is starting to develop a classic bow echo shape, winds will be howling with this:



Aw geeze.. They REALLY don't need more tornadoes going through that area. :| (Not that anyone "needs" tornadoes .. oi, you know what I mean.)
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Quoting TropicalAnalystwx13:
Would make for a bad day.



That kind of hail will punish vehicles...
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Quoting MAweatherboy1:
These storms mean business today, I think the SPC may have underestimated this event a little.



The SPC meso analysis seems to indicate its more of a moderate risk day than a slight risk one. The SPC seems to go a bit conservative with severe events that are based more on atmospheric conditions as apposed to a strong system that produces them.

Their most bullish forecasts I've noticed are when a very strong and dynamic low pressure system is present. However they seem to be a bit conservative with these events where the severe is driven more solely on atmospheric conditions that provide severe potential like like today.

Maybe It's because these type of events can be a bit more fickle and over all less predictable. I don't know, just my speculation.
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Feel bad for the people who are about to get their cars destroyed.

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Quoting MAweatherboy1:
These storms are moving too, this line is flying at around 70mph. Also producing 70mph winds, and a tornado threat:


Wow, this line is starting to develop a classic bow echo shape, winds will be howling with this:

Member Since: February 11, 2012 Posts: 79 Comments: 7302
Quoting Thrawst:
Hartsfield Jackson International Airport is in a current state of Groundstop, per TWC.


The softball size hail they were reporting can do that...Lol.
Member Since: Posts: Comments:
Not much rotation but it has the looks. All the poor rush hour drivers are about to get a rough one.
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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.