Alert archive / Georgia / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 415, NWS Atlanta, GA

July 8, 2008Forsyth County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 8, 2008, 6:59 PM EDT for Forsyth County, Georgia. It was in force for 46 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: Jul 8, 2008, 6:59 PM EDT (22:59 UTC)
Expired: Jul 8, 2008, 7:45 PM EDT
In force: 46 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

County Forsyth County, GA

The radar

The Atlanta radar (KFFC), 98 km from the middle of the area, began a volume at 23:00 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
Jul 8, 7:20 PM EDT	TSTM WND DMG	3 Sw Cumming, GA	8 TREES DOWN FROM ATLANTA HIGHWAY TO CASTLEBERRY ROAD

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

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.0 hours before the alert went out and 95 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: 1294 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 11 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 082259
SVRFFC
GAC117-082345-
/O.NEW.KFFC.SV.W.0415.080708T2259Z-080708T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
659 PM EDT TUE JUL 8 2008

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL FORSYTH COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 745 PM EDT

* AT 656 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZED HAIL...AND
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED OVER
  SOUTHWESTERN FORSYTH COUNTY...MOVING NORTHEAST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY
  UNINCORPORATED AREAS OF THE INDICATED COUNTY.

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 3425 8421 3417 8409 3411 8418 3415 8424
TIME...MOT...LOC 2259Z 219DEG 4KT 3416 8419

$$

2 follow-up statements

000 
WWUS52 KFFC 082327
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
727 PM EDT TUE JUL 8 2008

GAC117-082345-
/O.CON.KFFC.SV.W.0415.000000T0000Z-080708T2345Z/
FORSYTH GA-
727 PM EDT TUE JUL 8 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR CENTRAL FORSYTH COUNTY...

AT 726 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZED
HAIL...AND DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS LOCATED OVER
CENTRAL FORSYTH COUNTY...MOVING NORTHEAST AT 5 MPH.

THE SEVERE THUNDERSTORM WILL AFFECT DREW AND CUMMING.

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 3425 8421 3417 8409 3411 8418 3415 8424
TIME...MOT...LOC 2327Z 219DEG 4KT 3418 8417

$$

000 
WWUS52 KFFC 082337
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
735 PM EDT TUE JUL 8 2008

GAC117-082345-
/O.EXP.KFFC.SV.W.0415.000000T0000Z-080708T2345Z/
FORSYTH GA-
735 PM EDT TUE JUL 8 2008

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FORSYTH COUNTY WILL 
BE ALLOWED TO EXPIRE AT 745 PM EDT...

AT 734 PM EDT...A STRONG THUNDERSTORM CONTINUED OVER CENTRAL FORSYTH 
COUNTY...MOVING NORTHEAST AT 5 MPH.  THIS STORM HAS WEAKENED TO 
BELOW SEVERE LIMITS...THUS THE WARNING WILL BE ALLOWED TO EXPIRE AT 
745 PM.  WIND GUSTS TO 40 MPH AND PEA SIZED HAIL WILL STILL BE 
POSSIBLE WITH THIS STORM AS IT DRIFTS SLOWLY ACROSS CENTRAL FORSYTH 
COUNTY.

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 3425 8421 3417 8409 3411 8418 3415 8424
TIME...MOT...LOC 2335Z 219DEG 4KT 3419 8416

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 8:23 PM EDT	Severe Thunderstorm Warning	FFC	Cherokee, Cobb	29 min
Jul 7, 8:33 PM EDT	Severe Thunderstorm Warning	FFC	Paulding	42 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.