Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 360, NWS Atlanta, GA

June 21, 2011Hancock County, Washington County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jun 21, 2011, 7:07 PM EDT for Hancock County, Washington County, Georgia. It was in force for 38 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: Jun 21, 2011, 7:07 PM EDT (23:07 UTC)
Expired: Jun 21, 2011, 7:45 PM EDT
In force: 38 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Hancock County, GA, Washington County, GA

The radar

The Robins AFB radar (KJGX), 77 km from the middle of the area, began a volume at 23:07 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, 11.1 hours before the alert went out and 161 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: 1450 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1187 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: -64 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.

687 
WUUS52 KFFC 212307
SVRFFC
GAC141-303-212345-
/O.NEW.KFFC.SV.W.0360.110621T2307Z-110621T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
707 PM EDT TUE JUN 21 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN HANCOCK COUNTY IN EAST CENTRAL GEORGIA
  NORTHWESTERN WASHINGTON COUNTY IN EAST CENTRAL GEORGIA

* UNTIL 745 PM EDT

* AT 700 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 7 MILES NORTH
  OF DEEPSTEP...MOVING EAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HAMBURG STATE PARK AND WARTHEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT 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.

&&

LAT...LON 3309 8266 3301 8300 3318 8308 3331 8278
      3327 8278 3325 8275 3322 8274 3319 8274
      3315 8269
TIME...MOT...LOC 2307Z 248DEG 6KT 3313 8294

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 5:50 PM EDT	Special Weather Statement	FFC	Chattooga, Dade, Floyd, Walker	55 min
Jun 21, 6:02 PM EDT	Severe Thunderstorm Warning	FFC	Catoosa, Chattooga, Dade, Walker	43 min
Jun 21, 6:04 PM EDT	Severe Thunderstorm Warning	FFC	Oglethorpe, Wilkes	41 min
Jun 21, 6:28 PM EDT	Special Weather Statement	FFC	Twiggs, Wilkinson	47 min
Jun 21, 6:37 PM EDT	Severe Thunderstorm Warning	FFC	Twiggs, Wilkinson	38 min
Jun 21, 6:45 PM EDT	Special Weather Statement	FFC	Catoosa	30 min
Jun 21, 6:46 PM EDT	Special Weather Statement	FFC	Bleckley	29 min
Jun 21, 6:49 PM EDT	Special Weather Statement	FFC	Oglethorpe, Wilkes	41 min
Jun 21, 6:59 PM EDT	Special Weather Statement	FFC	Hancock	46 min
Jun 21, 7:12 PM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Twiggs, Wilkinson	32 min
Jun 21, 7:25 PM EDT	Special Weather Statement	FFC	Murray	50 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011 Every severe thunderstorm warning in 2011

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.