Alert archive / Georgia / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 20, NWS Atlanta, GA

February 17, 20084 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Feb 17, 2008, 4:27 PM EST for 4 counties in Georgia. It was in force for 33 min. 1 report 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 17, 2008, 4:27 PM EST (21:27 UTC)
Expired: Feb 17, 2008, 5:00 PM EST
In force: 33 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Cherokee County, GA, Dawson County, GA, Forsyth County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 108 km from the middle of the area, began a volume at 21:29 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
Feb 17, 4:44 PM EST	TSTM WND DMG	Cumming, GA	TWO TREES DOWN, ONE POWERLINE DOWN.

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.

Issued	Product	Office	Lasted
Feb 17, 4:01 PM EST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.5 hours before the alert went out and 105 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1892 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 320 m²/s²
0-3 km storm-relative helicity: 438 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 172127
SVRFFC
GAC057-085-117-121-172200-
/O.NEW.KFFC.SV.W.0020.080217T2127Z-080217T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
427 PM EST SUN FEB 17 2008

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CHEROKEE COUNTY IN NORTH CENTRAL GEORGIA
  DAWSON COUNTY IN NORTH CENTRAL GEORGIA
  FORSYTH COUNTY IN NORTH CENTRAL GEORGIA
  NORTHEASTERN FULTON COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 500 PM EST

* AT 424 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZED
  HAIL...AND DAMAGING WINDS UP TO 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM BALL GROUND TO 7 MILES SOUTHEAST OF
  BUFFINGTON TO ROSWELL...MOVING EAST AT 85 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ALPHARETTA...CUMMING...MCKEE...DOUGHERTY AND CHESTATEE.

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 900 PM EST SUNDAY EVENING FOR
NORTHERN 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 3420 8398 3419 8404 3410 8411 3399 8438
      3409 8443 3414 8441 3438 8450 3439 8427
      3447 8427 3451 8415 3445 8409 3441 8397
      3434 8398 3428 8393
TIME...MOT...LOC 2127Z 248DEG 77KT 3435 8435 3418 8429
          3405 8434

$$

1 follow-up statement

000 
WWUS52 KFFC 172133
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
433 PM EST SUN FEB 17 2008

GAC057-085-117-121-172200-
/O.CON.KFFC.SV.W.0020.000000T0000Z-080217T2200Z/
FORSYTH GA-CHEROKEE GA-DAWSON GA-FULTON GA-
433 PM EST SUN FEB 17 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EST
FOR NORTHEASTERN FULTON...DAWSON...EASTERN CHEROKEE AND FORSYTH
COUNTIES...

AT 433 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY
SIZED HAIL...AND DAMAGING WINDS UP TO 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 6 MILES EAST OF NELSON TO DREW TO
ALPHARETTA...AND MOVING EAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SILVER
CITY...CUMMING...COAL MOUNTAIN...MCKEE...DAWSONVILLE...DOUGHERTY...
CHESTATEE AND OSCARVILLE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EST SUNDAY EVENING FOR
NORTHWESTERN GEORGIA. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL
900 PM EST SUNDAY EVENING FOR NORTHERN 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 3420 8398 3419 8404 3410 8411 3399 8438
      3409 8443 3414 8441 3438 8450 3439 8427
      3447 8427 3451 8415 3445 8409 3441 8397
      3434 8398 3428 8393
TIME...MOT...LOC 2133Z 249DEG 62KT 3440 8419 3425 8415
          3407 8422

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 17, 4:21 AM EST	Wind Advisory	FFC	Bartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 12 more	18 hr
Feb 17, 3:21 PM EST	Severe Thunderstorm Warning	FFC	Carroll, Haralson, Heard, Paulding	24 min
Feb 17, 3:27 PM EST	Tornado Warning	FFC	Carroll, Heard	33 min
Feb 17, 3:40 PM EST	Severe Thunderstorm Warning	FFC	Bartow, Carroll, Douglas, Haralson, Paulding, Polk	35 min
Feb 17, 3:52 PM EST	Tornado Warning	FFC	Carroll, Coweta, Douglas, Fulton	23 min
Feb 17, 4:07 PM EST	Severe Thunderstorm Warning	FFC	Bartow, Cherokee, Cobb, Fulton, Paulding	23 min
Feb 17, 4:11 PM EST	Tornado Warning	FFC	Douglas, Fulton	34 min
Feb 17, 4:39 PM EST	Tornado Warning	FFC	Fulton	36 min
Feb 17, 4:44 PM EST	Tornado Warning	FFC	Stewart	36 min
Feb 17, 4:57 PM EST	Tornado Warning	FFC	DeKalb, Gwinnett	33 min
Feb 17, 5:02 PM EST	Tornado Warning	FFC	Chattahoochee	43 min
Feb 17, 5:26 PM EST	Tornado Warning	FFC	Marion	33 min
Feb 17, 5:45 PM EST	Tornado Warning	FFC	Taylor	45 min
Feb 17, 5:50 PM EST	Severe Thunderstorm Warning	FFC	Stewart	40 min
Feb 17, 6:12 PM EST	Tornado Warning	FFC	Crawford	33 min
Feb 17, 6:26 PM EST	Severe Thunderstorm Warning	FFC	Marion, Schley, Sumter, Webster	34 min
Feb 17, 6:37 PM EST	Tornado Warning	FFC	Bibb	38 min
Feb 17, 6:49 PM EST	Severe Thunderstorm Warning	FFC	Crisp, Dooly, Macon, Schley, Sumter	26 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2008 Every severe thunderstorm warning in 2008

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.