Alert archive / Georgia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 21, NWS Atlanta, GA

February 18, 20094 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Feb 18, 2009, 5:36 PM EST for 4 counties in Georgia. It was in force for 54 min. 6 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
Feb 18, 2009, 5:36 PM EST (22:36 UTC)
Expired
Feb 18, 2009, 6:30 PM EST
In force
54 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon

Counties Cobb County, GA, DeKalb County, GA, Fulton County, GA, Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 63 km from the middle of the area, began a volume at 22:40 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
Feb 18, 5:48 PM ESTHAIL 1.75Tucker, GA
Feb 18, 5:50 PM ESTHAIL 0.88Tucker, GA
Feb 18, 5:50 PM ESTHAIL 1Lilburn, GAQUARTER SIZED HAIL REPORTED.
Feb 18, 6:00 PM ESTHAIL 1.75Lilburn, GA
Feb 18, 6:03 PM ESTHAIL 1Sw Snellville, GA
Feb 18, 6:05 PM ESTHAIL 1.75Chamblee, GA

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
Feb 18, 3:32 PM ESTTornado WatchSPC7 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.6 hours before the alert went out and 60 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 2009-02-18Temperature 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 2009-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 605 square meters per square second.1939587897117Sfc1 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
588 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
605 m²/s²
0-3 km storm-relative helicity
895 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.

000 
WUUS52 KFFC 182236
SVRFFC
GAC067-089-121-135-182330-
/O.NEW.KFFC.SV.W.0021.090218T2236Z-090218T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
536 PM EST WED FEB 18 2009

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN COBB COUNTY IN NORTH CENTRAL GEORGIA
  NORTHERN DEKALB COUNTY IN NORTH CENTRAL GEORGIA
  CENTRAL FULTON COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHWESTERN GWINNETT COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 630 PM EST

* AT 535 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZED HAIL...AND
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED NEAR
  BUCKHEAD...MOVING EAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SANDY
  SPRINGS...DUNWOODY...DRUID HILLS...CHAMBLEE...DECATUR...
  DORAVILLE...AVONDALE ESTATES...CLARKSTON...TUCKER...NORCROSS...PINE
  LAKE...STONE MOUNTAIN...LILBURN AND SNELLVILLE.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EST WEDNESDAY EVENING
FOR GEORGIA.

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 3393 8394 3372 8406 3375 8427 3379 8452
      3397 8451
TIME...MOT...LOC 2236Z 271DEG 37KT 3388 8440

$$
1 follow-up statement
000 
WWUS52 KFFC 182325
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
625 PM EST WED FEB 18 2009

GAC067-089-121-135-182335-
/O.EXP.KFFC.SV.W.0021.000000T0000Z-090218T2330Z/
DEKALB GA-COBB GA-GWINNETT GA-FULTON GA-
625 PM EST WED FEB 18 2009

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FULTON...SOUTHWESTERN
GWINNETT...SOUTHEASTERN COBB AND NORTHERN DEKALB COUNTIES EXPIRES AT
630 PM EST...

AT 620 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE STORMS THAT EARLIER PROMPTED THE WARNING FOR DEKALB AND 
FULTON COUNTY HAVE WEAKENED AND ARE NO LONGER EXPECTED TO BE 
PRODUCING SEVERE WEATHER.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EST WEDNESDAY EVENING
FOR GEORGIA.

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.

LAT...LON 3393 8394 3372 8406 3375 8427 3379 8452
      3397 8451
TIME...MOT...LOC 2325Z 271DEG 37KT 3387 8379

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 18, 3:43 PM ESTSevere Thunderstorm WarningFFCBartow, Chattooga, Floyd, Gordon52 min
Feb 18, 3:52 PM ESTWind AdvisoryFFCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 90 more27 hr
Feb 18, 4:19 PM ESTSevere Thunderstorm WarningFFCChattahoochee, Marion, Muscogee41 min
Feb 18, 4:22 PM ESTTornado WarningFFCBartow, Cherokee38 min
Feb 18, 4:52 PM ESTTornado WarningFFCHarris, Talbot38 min
Feb 18, 4:53 PM ESTTornado WarningFFCCherokee, Forsyth, Fulton37 min
Feb 18, 5:02 PM ESTTornado WarningFFCCarroll43 min
Feb 18, 5:06 PM ESTTornado WarningFFCMarion, Schley, Taylor24 min
Feb 18, 5:31 PM ESTTornado WarningFFCCarroll, Coweta, Douglas, Fulton44 min
Feb 18, 5:32 PM ESTTornado WarningFFCTalbot, Taylor27 min
Feb 18, 5:33 PM ESTTornado WarningFFCMacon, Taylor22 min
Feb 18, 5:43 PM ESTTornado WarningFFCDeKalb, Fulton, Gwinnett34 min
Feb 18, 5:54 PM ESTTornado WarningFFCClayton, Coweta, Fayette, Fulton, Henry, Spalding51 min
Feb 18, 5:59 PM ESTTornado WarningFFCGwinnett, Walton46 min
Feb 18, 6:01 PM ESTSevere Thunderstorm WarningFFCCrawford, Houston, Peach44 min
Feb 18, 6:13 PM ESTTornado WarningFFCCarroll47 min
Feb 18, 6:19 PM ESTTornado WarningFFCHouston, Twiggs26 min
Feb 18, 6:21 PM ESTTornado WarningFFCClarke, Greene, Morgan, Oconee, Oglethorpe, Walton54 min
Feb 18, 6:22 PM ESTSevere Thunderstorm WarningFFCCarroll, Haralson38 min
Feb 18, 6:33 PM ESTTornado WarningFFCButts, Henry, Jasper, Newton42 min
Feb 18, 6:44 PM ESTTornado WarningFFCBleckley, Laurens, Twiggs25 min
Feb 18, 6:48 PM ESTTornado WarningFFCWilkinson22 min
Feb 18, 6:50 PM ESTTornado WarningFFCJasper, Putnam55 min
Feb 18, 6:54 PM ESTSevere Thunderstorm WarningFFCCarroll, Coweta, Douglas, Fulton18 min
Feb 18, 6:58 PM ESTTornado WarningFFCGreene, Oglethorpe, Taliaferro, Warren, Wilkes77 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2009Every severe thunderstorm warning in 2009

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.