Alert archive / Georgia / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 121, NWS Atlanta, GA
NWS Atlanta, GA issued this severe thunderstorm warning at May 20, 2012, 6:27 PM EDT for Forsyth County, Georgia. It was in force for 22 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
- May 20, 2012, 6:27 PM EDT (22:27 UTC)
- Expired
- May 20, 2012, 6:49 PM EDT
- In force
- 22 min
- Issued by
- NWS Atlanta, GA
- Area
- Storm-based polygon
County Forsyth County, GA
The radar
The Atlanta radar (KFFC), 99 km from the middle of the area, began a volume at 22:27 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 nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.5 hours before the alert went out and 97 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1433 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
891
WUUS52 KFFC 202227
SVRFFC
GAC117-202315-
/O.NEW.KFFC.SV.W.0121.120520T2227Z-120520T2315Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
627 PM EDT SUN MAY 20 2012
THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL FORSYTH COUNTY IN NORTH CENTRAL GEORGIA
* UNTIL 715 PM EDT
* AT 623 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
CUMMING...MOVING SOUTH AT 15 MPH.
* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
AREAS OF THE INDICATED COUNTY.
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 3410 8411 3410 8426 3429 8426 3429 8425
3430 8410
TIME...MOT...LOC 2228Z 359DEG 15KT 3420 8421
$$1 follow-up statement
546
WWUS52 KFFC 202249
SVSFFC
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
649 PM EDT SUN MAY 20 2012
GAC117-202300-
/O.CAN.KFFC.SV.W.0121.000000T0000Z-120520T2315Z/
FORSYTH GA-
649 PM EDT SUN MAY 20 2012
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FORSYTH COUNTY IS
CANCELLED...
THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.
IF YOU SEE WIND DAMAGE...HAIL OR FLOODING...WAIT UNTIL THE STORM HAS
PASSED...AND THEN CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1 8
6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.
LAT...LON 3410 8411 3411 8426 3429 8426 3429 8425
3430 8410
TIME...MOT...LOC 2250Z 359DEG 15KT 3411 8421
$$The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 8:28 PM EDT | Special Weather Statement | FFC | Towns, Union | 32 min |
| May 20, 3:55 PM EDT | Special Weather Statement | FFC | Walker | 35 min |
| May 20, 5:02 PM EDT | Special Weather Statement | FFC | Forsyth, Gwinnett | 28 min |
| May 20, 5:31 PM EDT | Special Weather Statement | FFC | Forsyth | 29 min |
| May 20, 6:08 PM EDT | Special Weather Statement | FFC | DeKalb, Fulton | 37 min |
| May 20, 6:09 PM EDT | Special Weather Statement | FFC | Lumpkin | 36 min |
| May 20, 6:46 PM EDT | Special Weather Statement | FFC | DeKalb | 29 min |
| May 20, 7:00 PM EDT | Severe Thunderstorm Warning | FFC | Clayton, DeKalb, Fulton | 31 min |
| May 20, 7:28 PM EDT | Special Weather Statement | FFC | Union | 32 min |
| May 20, 7:36 PM EDT | Special Weather Statement | FFC | Clayton, Fayette | 24 min |
| May 20, 7:58 PM EDT | Special Weather Statement | FFC | Coweta, Fayette | 32 min |
Nearby
Severe Thunderstorm Warnings in Georgia, 2012Every 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.