Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 84, NWS Atlanta, GA

April 27, 2012Chattooga County, Floyd County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 27, 2012, 4:40 PM EDT for Chattooga County, Floyd County, Georgia. It was in force for 35 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
Apr 27, 2012, 4:40 PM EDT (20:40 UTC)
Expired
Apr 27, 2012, 5:15 PM EDT
In force
35 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon

Counties Chattooga County, GA, Floyd County, GA

The radar

The Northeast Alabama radar (KHTX), 87 km from the middle of the area, began a volume at 20:42 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

Birmingham, AL (KBMX), launched 12:00Z, 8.7 hours before the alert went out and 188 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2012-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 540 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2012-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
540 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
550 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
180 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.

502 
WUUS52 KFFC 272040
SVRFFC
GAC055-115-272115-
/O.NEW.KFFC.SV.W.0084.120427T2040Z-120427T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
440 PM EDT FRI APR 27 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CHATTOOGA COUNTY IN NORTHWEST GEORGIA
  WEST CENTRAL FLOYD COUNTY IN NORTHWEST GEORGIA

* UNTIL 515 PM EDT

* AT 438 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 11 MILES
  SOUTHWEST OF SUMMERVILLE...MOVING EAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MENLO...CHATTOOGAVILLE...LYERLY...BERRYTON...COOSA...HOLLAND...
  TIDINGS AND JAMES H. FLOYD STATE PARK.

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 3446 8523 3424 8531 3430 8547 3446 8551
      3451 8551
TIME...MOT...LOC 2039Z 287DEG 12KT 3441 8552

$$
1 follow-up statement
028 
WWUS52 KFFC 272107
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
507 PM EDT FRI APR 27 2012

GAC055-115-272115-
/O.CON.KFFC.SV.W.0084.000000T0000Z-120427T2115Z/
CHATTOOGA GA-FLOYD GA-
507 PM EDT FRI APR 27 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR CENTRAL FLOYD AND SOUTHWESTERN CHATTOOGA COUNTIES...

AT 501 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM NEAR LYERLY...MOVING EAST AT 15 MPH. 
ALTHOUGH THIS STORM HAS WEAKENED SOMEWHAT...IT IS STILL CAPABLE OF 
PRODUCING UP TO QUARTER SIZED HAIL...AND DAMAGING WINDS UP TO 60 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
HOLLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3429 8529 3434 8548 3445 8550 3446 8540
      3440 8525
TIME...MOT...LOC 2106Z 291DEG 13KT 3437 8539

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 9:08 PM EDTSpecial Weather StatementFFCTowns37 min
Apr 27, 3:20 PM EDTSpecial Weather StatementFFCChattooga25 min
Apr 27, 3:41 PM EDTSpecial Weather StatementFFCChattooga34 min
Apr 27, 4:11 PM EDTSpecial Weather StatementFFCChattooga34 min
Apr 27, 5:15 PM EDTSpecial Weather StatementFFCChattooga30 min
Apr 27, 5:30 PM EDTSpecial Weather StatementFFCCobb30 min
Apr 27, 5:54 PM EDTSpecial Weather StatementFFCForsyth36 min
Apr 27, 6:30 PM EDTSpecial Weather StatementFFCGwinnett30 min
Apr 27, 6:47 PM EDTSpecial Weather StatementFFCClarke28 min
Apr 27, 7:05 PM EDTSevere Thunderstorm WarningFFCBarrow, Jackson25 min
Apr 27, 7:07 PM EDTSevere Thunderstorm WarningFFCMadison38 min
Apr 27, 7:27 PM EDTSpecial Weather StatementFFCHall, Jackson33 min
Apr 27, 7:46 PM EDTSpecial Weather StatementFFCMadison14 min
Apr 27, 7:54 PM EDTSpecial Weather StatementFFCMadison36 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.