Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 104, NWS Atlanta, GA

April 4, 2011Catoosa County, Dade County, Walker County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 4, 2011, 6:20 PM EDT for Catoosa County, Dade County, Walker County, Georgia. It was in force for 40 min. 5 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 4, 2011, 6:20 PM EDT (22:20 UTC)
Expired
Apr 4, 2011, 7:00 PM EDT
In force
40 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon

Counties Catoosa County, GA, Dade County, GA, Walker County, GA

The radar

The Northeast Alabama radar (KHTX), 77 km from the middle of the area, began a volume at 22:23 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 4, 6:20 PM EDTTSTM WND DMG3 Wnw Morganville, GADADE COUNTY EMERGENCY MANAGEMENT REPORTED A DOWNED TREE IN MURPHY HOLLOW.
Apr 4, 6:28 PM EDTTSTM WND DMG2 Ene Lookout Mountain, GANORTH GEORGIA EMC REPORTS POWER OUTAGES IN THEIR SERVICE AREA.
Apr 4, 6:30 PM EDTTSTM WND DMG2 W Fort Oglethorpe, GAWALKER COUNTY 911 REPORTS A TREE DOWNED ONTO A POWERLINE NEAR CHICKAMAUGA.
Apr 4, 6:30 PM EDTTSTM WND DMGFort Oglethorpe, GACATOOSA COUNTY 911 RELAYED REPORTS OF 4-5 DOWNED TREES IN FORT OGLETHORPE.
Apr 4, 6:30 PM EDTTSTM WND DMGRossville, GAWALKER COUNTY 911 RELAYED REPORTS OF A DOWNED POWERLINE NEAR ROSSVILLE.

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 4, 5:55 PM EDTTornado WatchSPC6 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.3 hours before the alert went out and 179 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 12:00Z on 2011-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2011-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2372 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
224 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.

159 
WUUS52 KFFC 042220
SVRFFC
GAC047-083-295-042300-
/O.NEW.KFFC.SV.W.0104.110404T2220Z-110404T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
620 PM EDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CATOOSA COUNTY IN NORTHWEST GEORGIA
  DADE COUNTY IN NORTHWEST GEORGIA
  NORTHWESTERN WALKER COUNTY IN NORTHWEST GEORGIA

* UNTIL 700 PM EDT

* AT 614 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS UP
  TO 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING       
  FROM CHATTANOOGA IN TENNESSEE TO RISING FAWN...MOVING EAST AT 40   
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FORT
  OGLETHORPE...CHICKAMAUGA AND RINGGOLD.

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 MIDNIGHT EDT TUESDAY MORNING
FOR NORTHERN GEORGIA.

&&

LAT...LON 3499 8498 3497 8498 3497 8500 3494 8500
      3489 8504 3468 8531 3467 8536 3465 8553
      3465 8554 3493 8561 3499 8560
TIME...MOT...LOC 2218Z 258DEG 35KT 3509 8521 3491 8546
          3466 8580

$$
1 follow-up statement
129 
WWUS52 KFFC 042257
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
657 PM EDT MON APR 4 2011

GAC047-083-295-042305-
/O.EXP.KFFC.SV.W.0104.000000T0000Z-110404T2300Z/
WALKER GA-CATOOSA GA-DADE GA-
657 PM EDT MON APR 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR DADE...CATOOSA AND 
NORTHWESTERN WALKER COUNTIES WILL BE ALLOWED TO EXPIRE AT 700 PM 
EDT...

AT 651 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO 
INDICATE A LINE OF STRONG TO SEVERE THUNDERSTORMS CAPABLE OF 
PRODUCING DAMAGING WINDS UP TO 60 MPH. THESE STORMS WERE LOCATED 
ALONG A LINE EXTENDING FROM 18 MILES NORTHEAST OF SALEM TO SALEM TO 
CEDAR GROVE...MOVING EAST AT 40 MPH.

THIS PARTICULAR AREA OF STORMS HAS BEEN WEAKENING...WITH THE 
STRONGEST PART NOW MOVING INTO SOUTHERN TENNESSEE.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
RINGGOLD...ROCK SPRING...LINWOOD...NOBLE AND BEAUMONT.

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 MIDNIGHT EDT TUESDAY MORNING 
FOR NORTHERN GEORGIA. ADDITIONAL STRONG TO SEVERE STORMS WILL BE 
APPROACHING FROM NORTHEAST ALABAMA WITHIN THE NEXT HOUR.

LAT...LON 3499 8498 3497 8498 3497 8500 3494 8500
      3489 8504 3468 8531 3467 8536 3465 8553
      3465 8554 3493 8561 3499 8560
TIME...MOT...LOC 2255Z 258DEG 35KT 3516 8478 3498 8503
          3474 8537

$$



19

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 4, 5:44 PM EDTSevere Thunderstorm WarningFFCDade, Walker31 min

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.