Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 186, NWS Atlanta, GA

April 21, 2011Bartow County, Floyd County, Polk County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 21, 2011, 2:06 AM EDT for Bartow County, Floyd County, Polk County, Georgia. It was in force for 39 min. 2 reports 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 21, 2011, 2:06 AM EDT (06:06 UTC)
Expired: Apr 21, 2011, 2:45 AM EDT
In force: 39 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Bartow County, GA, Floyd County, GA, Polk County, GA

The radar

The Atlanta radar (KFFC), 111 km from the middle of the area, began a volume at 06:06 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 21, 2:20 AM EDT	TSTM WND DMG	Rome, GA	THE 911 CENTER REPORTED NUMEROUS TREES AND POWERLINES DOWN COUNTYWIDE.
Apr 21, 2:39 AM EDT	TSTM WND DMG	4 Nw Cartersville, GA	ONE TREE DOWN ON VILLAGE DRIVE.

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, 6.1 hours before the alert went out and 113 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: 316 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1406 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 108 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.

482 
WUUS52 KFFC 210606
SVRFFC
GAC015-115-233-210645-
/O.NEW.KFFC.SV.W.0186.110421T0606Z-110421T0645Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
206 AM EDT THU APR 21 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN BARTOW COUNTY IN NORTHWEST GEORGIA
  SOUTHERN FLOYD COUNTY IN NORTHWEST GEORGIA
  NORTHWESTERN POLK COUNTY IN NORTHWEST GEORGIA

* UNTIL 245 AM EDT

* AT 202 AM 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 CAVE
  SPRING...MOVING NORTHEAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ROME...TAYLORSVILLE...SHANNON...EUHARLEE...KINGSTON...CASSVILLE...
  CARTERSVILLE AND ADAIRSVILLE.

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 3438 8508 3439 8497 3439 8496 3440 8495
      3440 8492 3416 8476 3392 8537 3400 8542
      3419 8544
TIME...MOT...LOC 0607Z 241DEG 41KT 3411 8524

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 1:54 AM EDT	Severe Thunderstorm Warning	FFC	Carroll, Haralson	51 min
Apr 21, 2:27 AM EDT	Severe Thunderstorm Warning	FFC	Carroll, Coweta, Douglas, Fulton, Heard	48 min
Apr 21, 2:46 AM EDT	Severe Thunderstorm Warning	FFC	Cobb, Douglas, Fulton, Paulding	44 min
Apr 21, 3:08 AM EDT	Severe Thunderstorm Warning	FFC	Cherokee, Dawson, DeKalb, Forsyth, Fulton, Gwinnett	52 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.