Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 79, NWS Atlanta, GA

April 17, 2012Dawson County, Lumpkin County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 17, 2012, 6:00 PM EDT for Dawson County, Lumpkin County, Georgia. It was in force for 45 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 17, 2012, 6:00 PM EDT (22:00 UTC)
Expired: Apr 17, 2012, 6:45 PM EDT
In force: 45 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Dawson County, GA, Lumpkin County, GA

The radar

The Atlanta radar (KFFC), 129 km from the middle of the area, began a volume at 22:01 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.

What was reported inside it

Time	Report	Where	Remark
Apr 17, 6:00 PM EDT	HAIL 1	4 Ssw Dawsonville, GA	A COUNTY OFFICIAL REPORTED QUARTER SIZED HAIL AT SEVERAL LOCATIONS ACROSS THE SOUTHERN PORTION OF THE COUNTY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.0 hours before the alert went out and 127 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: 371 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 618 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

546 
WUUS52 KFFC 172200
SVRFFC
GAC085-187-172245-
/O.NEW.KFFC.SV.W.0079.120417T2200Z-120417T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
600 PM EDT TUE APR 17 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DAWSON COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHERN LUMPKIN COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 645 PM EDT

* AT 556 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZED HAIL...AND
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED NEAR
  DAWSONVILLE...MOVING NORTHEAST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DAHLONEGA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF QUARTER SIZED HAIL. SEEK SHELTER NOW 
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

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.

&&

LAT...LON 3453 8390 3443 8396 3442 8398 3441 8397
      3433 8403 3433 8426 3439 8426 3462 8413
TIME...MOT...LOC 2200Z 207DEG 15KT 3438 8414

$$

1 follow-up statement

791 
WWUS52 KFFC 172238
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
638 PM EDT TUE APR 17 2012

GAC085-187-172246-
/O.EXP.KFFC.SV.W.0079.000000T0000Z-120417T2245Z/
LUMPKIN GA-DAWSON GA-
638 PM EDT TUE APR 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR DAWSON AND SOUTHERN LUMPKIN
COUNTIES EXPIRES AT 645 PM EDT...

AT 633 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM CAPABLE OF DIME TO PENNY SIZED HAIL...AND 
GUSTY WINDS. THIS STORM WAS LOCATED NEAR AURARIA...MOVING 
NORTHEAST AT 15 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
NIMBLEWILL AND DAHLONEGA.

IF YOU SAW WIND DAMAGE...HAIL OR FLOODING...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.

LAT...LON 3453 8390 3443 8396 3442 8398 3441 8397
      3433 8403 3433 8426 3439 8426 3462 8413
TIME...MOT...LOC 2236Z 207DEG 15KT 3451 8406

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 3:05 PM EDT	Special Weather Statement	FFC	Paulding	25 min
Apr 17, 3:10 PM EDT	Special Weather Statement	FFC	Union	35 min
Apr 17, 3:26 PM EDT	Special Weather Statement	FFC	Bartow	34 min
Apr 17, 4:04 PM EDT	Special Weather Statement	FFC	Banks, Hall, Jackson	26 min
Apr 17, 4:13 PM EDT	Special Weather Statement	FFC	Bartow, Paulding	32 min
Apr 17, 4:26 PM EDT	Special Weather Statement	FFC	DeKalb	34 min
Apr 17, 4:27 PM EDT	Special Weather Statement	FFC	Banks	18 min
Apr 17, 4:37 PM EDT	Special Weather Statement	FFC	Carroll	38 min
Apr 17, 4:43 PM EDT	Special Weather Statement	FFC	Cherokee, Pickens	32 min
Apr 17, 5:12 PM EDT	Severe Thunderstorm Warning	FFC	Cherokee, Dawson, Forsyth, Pickens	48 min
Apr 17, 5:19 PM EDT	Special Weather Statement	FFC	Towns, White	26 min
Apr 17, 5:22 PM EDT	Special Weather Statement	FFC	Coweta	23 min
Apr 17, 5:35 PM EDT	Special Weather Statement	FFC	Douglas	25 min
Apr 17, 5:44 PM EDT	Special Weather Statement	FFC	Barrow	31 min
Apr 17, 6:02 PM EDT	Special Weather Statement	FFC	Douglas	28 min
Apr 17, 6:10 PM EDT	Special Weather Statement	FFC	Hall	35 min
Apr 17, 6:15 PM EDT	Special Weather Statement	FFC	DeKalb	30 min
Apr 17, 6:39 PM EDT	Special Weather Statement	FFC	DeKalb	36 min
Apr 17, 6:41 PM EDT	Special Weather Statement	FFC	Hall, Lumpkin, White	34 min
Apr 17, 7:00 PM EDT	Severe Thunderstorm Warning	FFC	Banks	45 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.