Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 116, NWS Atlanta, GA

May 17, 2012Dawson County, Forsyth County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 17, 2012, 9:06 PM EDT for Dawson County, Forsyth County, Georgia. It was in force for 39 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: May 17, 2012, 9:06 PM EDT (01:06 UTC)
Expired: May 17, 2012, 9:45 PM EDT
In force: 39 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Dawson County, GA, Forsyth County, GA

The radar

The Atlanta radar (KFFC), 112 km from the middle of the area, began a volume at 01:10 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
May 17, 9:20 PM EDT	HAIL 1	5 Se Dawsonville, GA	QUARTER SIZED HAIL REPORTED ON GRIZZLE FARM ROAD SOUTHEAST OF DAWSONVILLE.

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 00:00Z, 1.1 hours before the alert went out and 109 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: 57 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 2205 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

762 
WUUS52 KFFC 180106
SVRFFC
GAC085-117-180145-
/O.NEW.KFFC.SV.W.0116.120518T0106Z-120518T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
906 PM EDT THU MAY 17 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN DAWSON COUNTY IN NORTH CENTRAL GEORGIA
  FORSYTH COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 945 PM EDT

* AT 901 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZED
  HAIL...AND DAMAGING WINDS UP TO 60 MPH.  THESE STORMS WERE LOCATED 
  12 MILES NORTHEAST OF CUMMING TO 7 MILES EAST OF CUMMING MOVING    
  WEST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DOUGHERTY...SILVER CITY...COAL MOUNTAIN...HIGHTOWER...DREW...
  DUCKTOWN AND MATT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

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 3438 8400 3429 8396 3420 8401 3413 8424
      3427 8424 3439 8424
TIME...MOT...LOC 0105Z 086DEG 10KT 3435 8405 3430 8401
          3423 8404

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 8:19 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, Douglas, Fulton	41 min
May 17, 8:20 PM EDT	Special Weather Statement	FFC	Fayette	25 min
May 17, 8:56 PM EDT	Special Weather Statement	FFC	Forsyth	49 min
May 17, 8:59 PM EDT	Special Weather Statement	FFC	Douglas	46 min
May 17, 9:01 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Douglas, Fulton	44 min
May 17, 10:00 PM EDT	Special Weather Statement	FFC	Heard	30 min
May 18, 1:44 PM EDT	Special Weather Statement	FFC	Murray	31 min
May 18, 1:54 PM EDT	Special Weather Statement	FFC	Gilmer, Murray	51 min
May 18, 2:46 PM EDT	Special Weather Statement	FFC	Gordon	44 min
May 18, 3:00 PM EDT	Special Weather Statement	FFC	Gilmer	45 min
May 18, 3:19 PM EDT	Special Weather Statement	FFC	Fannin, Gilmer, Towns, Union	26 min
May 18, 3:49 PM EDT	Special Weather Statement	FFC	Fannin, Union	26 min
May 18, 3:52 PM EDT	Special Weather Statement	FFC	Gordon	38 min
May 18, 5:30 PM EDT	Special Weather Statement	FFC	Bartow, Floyd	45 min
May 18, 6:29 PM EDT	Special Weather Statement	FFC	Dade, Walker	46 min
May 18, 7:07 PM EDT	Severe Thunderstorm Warning	FFC	Dade	23 min
May 18, 7:27 PM EDT	Severe Thunderstorm Warning	FFC	Dade	33 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.