Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Atlanta, GA

February 29, 2012Chattooga County, Floyd County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Feb 29, 2012, 7:42 PM EST for Chattooga County, Floyd County, Georgia. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 29, 2012, 7:42 PM EST (00:42 UTC)
Expired: Feb 29, 2012, 8:15 PM EST
In force: 33 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Chattooga County, GA, Floyd County, GA

The radar

The Northeast Alabama radar (KHTX), 103 km from the middle of the area, began a volume at 00:44 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Feb 29, 6:37 PM EST	Tornado Watch	SPC	3 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.7 hours before the alert went out and 130 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 355 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 874 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

394 
WUUS52 KFFC 010042
SVRFFC
GAC055-115-010130-
/O.NEW.KFFC.SV.W.0039.120301T0042Z-120301T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
742 PM EST WED FEB 29 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CHATTOOGA COUNTY IN NORTHWEST GEORGIA
  FLOYD COUNTY IN NORTHWEST GEORGIA

* UNTIL 830 PM EST

* AT 739 PM EST/639 PM CST/...A LINE OF SEVERE THUNDERSTORMS WAS
  REPORTED CAPABLE OF PRODUCING DAMAGING WINDS UP TO 60 MPH.  THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM SUMMERVILLE TO 13
  MILES SOUTH OF SUMMERVILLE TO 16 MILES WEST OF CAVE SPRING...MOVING
  EAST AT 55 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SHANNON AND ROME.

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 100 AM EST THURSDAY MORNING
FOR NORTHERN GEORGIA.

&&

LAT...LON 3451 8537 3453 8513 3458 8511 3459 8508
      3455 8506 3454 8509 3447 8509 3446 8511
      3443 8509 3442 8511 3439 8501 3422 8503
      3421 8505 3410 8504 3408 8542 3433 8548
TIME...MOT...LOC 0043Z 264DEG 48KT 3444 8528 3432 8536
          3420 8553

$$

2 follow-up statements

755 
WWUS52 KFFC 010059
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
759 PM EST WED FEB 29 2012

GAC055-010108-
/O.CAN.KFFC.SV.W.0039.000000T0000Z-120301T0130Z/
CHATTOOGA GA-
759 PM EST WED FEB 29 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CHATTOOGA COUNTY HAS 
BEEN CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING FOR THIS AREA HAS MOVED 
EAST INTO FLOYD COUNTY. ALTHOUGH LIGHT TO MODERATE RAIN AND 
OCCASIONAL LIGHTNING WILL CONTINUE ACROSS THE SOUTHEAST HALF OF 
CHATTOOGA COUNTY FOR ANOTHER 30 MINUTES OR SO...SEVERE WEATHER IS NO 
LONGER INDICATED AT THIS TIME.

IF YOU SAW 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 100 AM EST THURSDAY MORNING
FOR NORTHERN GEORGIA.

LAT...LON 3428 8539 3434 8536 3435 8523 3445 8517
      3445 8511 3443 8509 3442 8511 3440 8509
      3439 8501 3422 8503 3421 8505 3410 8504
      3408 8542 3429 8547
TIME...MOT...LOC 0058Z 264DEG 48KT 3446 8504 3434 8512
          3422 8529

$$

GAC115-010130-
/O.CON.KFFC.SV.W.0039.000000T0000Z-120301T0130Z/
FLOYD GA-
759 PM EST WED FEB 29 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EST
FOR FLOYD COUNTY...

AT 753 PM EST...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING DAMAGING WINDS UP TO 60 MPH. THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM 6 MILES NORTHEAST OF ARMUCHEE TO ARMUCHEE
TO COOSA...MOVING EAST AT 55 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
PINSON...ROME...SHANNON...SILVER CREEK...AND LINDALE.

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 100 AM EST THURSDAY MORNING
FOR NORTHERN GEORGIA.

&&

LAT...LON 3428 8539 3434 8536 3435 8523 3445 8517
      3445 8511 3443 8509 3442 8511 3440 8509
      3439 8501 3422 8503 3421 8505 3410 8504
      3408 8542 3429 8547
TIME...MOT...LOC 0058Z 264DEG 48KT 3446 8504 3434 8512
          3422 8529

$$



19

763 
WWUS52 KFFC 010115
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
815 PM EST WED FEB 29 2012

GAC115-010122-
/O.CAN.KFFC.SV.W.0039.000000T0000Z-120301T0130Z/
FLOYD GA-
815 PM EST WED FEB 29 2012

...THE SEVERE THUNDERSTORM WARNING FOR FLOYD COUNTY IS CANCELLED...

THUNDERSTORMS HAVE WEAKENED ACROSS FLOYD COUNTY. MODERATE RAIN AND 
OCCASIONAL CLOUD-TO-GROUND LIGHTNING WILL STILL BE POSSIBLE FOR 
ANOTHER 30 TO 45 MINUTES.

IF YOU SAW 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 100 AM EST THURSDAY MORNING
FOR NORTHERN GEORGIA.

LAT...LON 3428 8539 3434 8536 3435 8523 3445 8517
      3445 8511 3443 8509 3442 8511 3440 8509
      3439 8501 3422 8503 3421 8505 3410 8504
      3408 8542 3429 8547
TIME...MOT...LOC 0112Z 264DEG 48KT 3447 8481 3435 8489
          3424 8507

$$



19

The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 29, 7:35 PM EST	Special Weather Statement	FFC	Chattooga, Floyd	55 min
Mar 1, 3:10 AM EST	Special Weather Statement	FFC	Coweta	35 min
Mar 1, 3:23 AM EST	Special Weather Statement	FFC	Fayette	37 min
Mar 1, 9:35 AM EST	Special Weather Statement	FFC	Washington	40 min
Mar 1, 10:16 AM EST	Special Weather Statement	FFC	Jefferson	44 min
Mar 1, 1:47 PM EST	Special Weather Statement	FFC	Emanuel, Treutlen	28 min
Mar 1, 1:54 PM EST	Severe Thunderstorm Warning	FFC	Emanuel, Johnson, Laurens, Treutlen	51 min
Mar 1, 3:15 PM EST	Special Weather Statement	FFC	Chattahoochee, Marion, Schley	45 min
Mar 1, 4:14 PM EST	Special Weather Statement	FFC	Dooly, Macon	46 min
Mar 1, 5:09 PM EST	Special Weather Statement	FFC	Bleckley, Houston, Peach, Twiggs	36 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.