Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 146, NWS Atlanta, GA

April 11, 20118 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 11, 2011, 9:21 PM EDT for 8 counties in Georgia. It was in force for 54 min. 7 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 11, 2011, 9:21 PM EDT (01:21 UTC)
Expired
Apr 11, 2011, 10:15 PM EDT
In force
54 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon

Counties Bartow County, GA, Chattooga County, GA, Floyd County, GA, Gordon County, GA, Murray County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA

The radar

The Northeast Alabama radar (KHTX), 104 km from the middle of the area, began a volume at 01:24 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

TimeReportWhereRemark
Apr 11, 9:22 PM EDTTSTM WND DMGCloudland, GATHE PUBLIC REPORTED A TREE ON A CAR IN CLOUDLAND.
Apr 11, 9:26 PM EDTTSTM WND DMGSummerville, GACHATTOOGA COUNTY 911 RELAYED A REPORT MANY TREES DOWN ACROSS THE ENTIRE COUNTY.
Apr 11, 9:29 PM EDTTSTM WND DMGLafayette, GAWALKER COUNTY 911 RELAYED A REPORT OF NUMEROUS TREES DOWN COUNTYWIDE.
Apr 11, 9:34 PM EDTHAIL 0.75Trion, GATHE PUBLIC REPORTED DIME SIZE HAIL IN TRION ALONG WITH POWER OUTAGES.
Apr 11, 9:48 PM EDTTSTM WND DMGRocky Face, GAWHITFIELD COUNTY 911 RELAYED A REPORT OF TWO TREES DOWN IN THE ROCKY FACE AREA.
Apr 11, 10:02 PM EDTTSTM WND DMGLindale, GAFLOYD COUNTY EMA RELAYED A REPORT OF A TREE DOWN ON A HOUSE IN LINDALE.
Apr 11, 10:11 PM EDTTSTM WND DMGAdairsville, GABARTOW COUNTY 911 RELAYED A REPORT OF THREE TREES DOWN IN THE ADAIRSVILLE AREA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 11, 8:08 PM EDTTornado WatchSPC7 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 1.4 hours before the alert went out and 140 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, Peachtre/Fal Fld, GA at 00:00Z on 2011-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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, Peachtre/Fal Fld, GA at 00:00Z on 2011-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 155 square meters per square second.19395878Sfc1 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
9 J/kg
Mixed-layer CIN
-501 J/kg
Mixed-layer LCL
1916 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
155 m²/s²
0-3 km storm-relative helicity
355 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

439 
WUUS52 KFFC 120121
SVRFFC
GAC015-055-115-129-213-233-295-313-120215-
/O.NEW.KFFC.SV.W.0146.110412T0121Z-110412T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
921 PM EDT MON APR 11 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BARTOW COUNTY IN NORTHWEST GEORGIA
  CHATTOOGA COUNTY IN NORTHWEST GEORGIA
  FLOYD COUNTY IN NORTHWEST GEORGIA
  GORDON COUNTY IN NORTHWEST GEORGIA
  MURRAY COUNTY IN NORTHWEST GEORGIA
  POLK COUNTY IN NORTHWEST GEORGIA
  SOUTHERN WALKER COUNTY IN NORTHWEST GEORGIA
  WHITFIELD COUNTY IN NORTHWEST GEORGIA

* UNTIL 1015 PM EDT

* AT 915 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZED
  HAIL...AND DAMAGING WINDS UP TO 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 15 MILES NORTHWEST OF SUMMERVILLE TO 18
  MILES NORTHWEST OF CAVE SPRING TO 32 MILES WEST OF CAVE SPRING...
  MOVING NORTHEAST AT 75 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  TRION...LAFAYETTE...CEDARTOWN...TUNNEL HILL...DALTON...VARNELL...
  RESACA...CALHOUN...PLAINVILLE...ROME...ROCKMART...ARAGON...
  SHANNON...TAYLORSVILLE...CHATSWORTH...ETON...EUHARLEE...KINGSTON...
  ADAIRSVILLE...CASSVILLE...CARTERSVILLE AND WHITE.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM EDT TUESDAY MORNING
FOR NORTHERN GEORGIA.

&&

LAT...LON 3420 8473 3408 8490 3408 8493 3403 8496
      3390 8527 3390 8539 3462 8554 3469 8549
      3481 8520 3478 8520 3477 8515 3482 8513
      3482 8507 3486 8506 3488 8502 3500 8473
      3500 8466 3499 8465
TIME...MOT...LOC 0121Z 243DEG 65KT 3464 8546 3426 8550
          3402 8576

$$
1 follow-up statement
343 
WWUS52 KFFC 120151
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
951 PM EDT MON APR 11 2011

GAC015-055-115-129-213-233-295-313-120215-
/O.CON.KFFC.SV.W.0146.000000T0000Z-110412T0215Z/
WHITFIELD GA-WALKER GA-POLK GA-MURRAY GA-BARTOW GA-CHATTOOGA GA-
FLOYD GA-GORDON GA-
951 PM EDT MON APR 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR GORDON...FLOYD...CHATTOOGA...BARTOW...MURRAY...POLK...
SOUTHEASTERN WALKER AND WHITFIELD COUNTIES...

AT 948 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZED 
HAIL...AND DESTRUCTIVE WINDS UP TO 70 MPH. THE MOST DANGEROUS PART 
OF THIS STORM WAS LOCATED NEAR 2 MILES SOUTHWEST OF DALTON...MOVING 
NORTHEAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
NICKELSVILLE...DALTON...REDBUD...AUDUBON...NORTH GEORGIA SPEEDWAY...
RANGER...DAWNVILLE...OAKMAN...CARTERS...RAMHURST...CHATSWORTH...
BEAVERDALE...ETON...SUMAC...FORT MOUNTAIN STATE PARK...CRANDALL...
GREGORY...CISCO AND TENNGA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED ROTATION WITHIN THIS STORM. ALTHOUGH
CURRENT DATA DOES NOT INDICATE THE EXISTENCE OF A TORNADO...A TORNADO
MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO
A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR
SMALL INTERIOR ROOM.

IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT FLOODING...WAIT
UNTIL AFTER 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM EDT TUESDAY MORNING
FOR NORTHERN GEORGIA.

&&

LAT...LON 3420 8473 3408 8493 3403 8496 3390 8527
      3390 8539 3441 8549 3471 8521 3478 8520
      3477 8515 3482 8513 3482 8506 3486 8506
      3500 8473 3500 8466
TIME...MOT...LOC 0150Z 243DEG 65KT 3474 8498

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 11, 8:38 PM EDTSevere Thunderstorm WarningFFCCatoosa, Chattooga, Dade, Walker52 min
Apr 11, 10:01 PM EDTSevere Thunderstorm WarningFFCCarroll, Cobb, Douglas, Haralson, Paulding, Polk44 min
Apr 11, 10:11 PM EDTSevere Thunderstorm WarningFFCBartow, Cherokee, Fannin, Gilmer, Gordon, Murray and 2 more34 min
Apr 11, 10:40 PM EDTSevere Thunderstorm WarningFFCBartow, Cherokee, Dawson, Fannin, Gilmer, Lumpkin and 2 more65 min
Apr 11, 10:44 PM EDTSevere Thunderstorm WarningFFCBartow, Carroll, Cherokee, Cobb, Coweta, Douglas and 4 more48 min
Apr 11, 11:42 PM EDTSevere Thunderstorm WarningFFCChattahoochee, Harris, Meriwether, Muscogee, Talbot, Troup48 min
Apr 12, 4:28 AM EDTWind AdvisoryFFCBaldwin, Banks, Barrow, Bartow, Bibb, Butts and 73 more16 hr

Nearby

Severe Thunderstorm Warnings in Georgia, 2011Every 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.