Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 118, NWS Atlanta, GA

May 18, 2012Dade County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 18, 2012, 7:27 PM EDT for Dade 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: May 18, 2012, 7:27 PM EDT (23:27 UTC)
Expired: May 18, 2012, 8:00 PM EDT
In force: 33 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

County Dade County, GA

The radar

The Northeast Alabama radar (KHTX), 50 km from the middle of the area, began a volume at 23:28 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

Nashville Metro, TN (KBNA), launched 12:00Z, 11.5 hours before the alert went out and 166 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: 790 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1195 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 48 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.

201 
WUUS52 KFFC 182327
SVRFFC
GAC083-190000-
/O.NEW.KFFC.SV.W.0118.120518T2327Z-120519T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
727 PM EDT FRI MAY 18 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN DADE COUNTY IN NORTHWEST GEORGIA

* UNTIL 800 PM EDT

* AT 723 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
  TRENTON...MOVING SOUTHWEST 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 3498 8548 3492 8542 3477 8557 3478 8558
      3498 8561 3499 8560
TIME...MOT...LOC 2328Z 056DEG 14KT 3490 8556

$$

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, 9:06 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Forsyth	39 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

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.