Alert archive / Georgia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 270, NWS Atlanta, GA

July 1, 2007Forsyth County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 1, 2007, 7:41 PM EDT for Forsyth County, Georgia. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 1, 2007, 7:41 PM EDT (23:41 UTC)
Expired: Jul 1, 2007, 8:11 PM EDT
In force: 30 min
Issued by: NWS Atlanta, GA
Area: Counties, with a storm outline in the text

County Forsyth County, GA

The radar

The Atlanta radar (KFFC), 109 km from the middle of the area, began a volume at 23:42 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 1, 1:10 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.7 hours before the alert went out and 106 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: 34 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 1436 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 30 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 012341
SVRFFC
GAC117-020030-
/O.NEW.KFFC.SV.W.0270.070701T2341Z-070702T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
741 PM EDT SUN JUL 1 2007

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 830 PM EDT

* AT 738 PM EDT...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 CENTERED 4 MILES NORTH
  OF CUMMING...MOVING SOUTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COAL
  MOUNTAIN.

IF ON OR NEAR THE SOUTHERN HALF OF LAKE LANIER...GET OUT OF THE WATER 
IMMEDIATELY AND MOVE TO SAFE SHELTER INDOORS OR INSIDE A VEHICLE.
REMEMBER...LIGHTNING CAN STRIKE AS FAR AS 15 MILES FROM THE PARENT
THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING. MOVE TO SAFE SHELTER NOW. DONT BE CAUGHT ON THE
WATER IN A THUNDERSTORM

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT SUNDAY
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 3433 8415 3424 8420 3416 8408 3426 8396

$$

1 follow-up statement

000 
WWUS52 KFFC 020011
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
809 PM EDT SUN JUL 1 2007

GAC117-020019-
/O.CAN.KFFC.SV.W.0270.000000T0000Z-070702T0030Z/
FORSYTH GA-
809 PM EDT SUN JUL 1 2007

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN FORSYTH COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS WEAKENED AND IS NO LONGER EXPECTED TO PRODUCE 
SEVERE WEATHER. HOWEVER...VERY HEAVY RAIN...AND FREQUENT LIGHTNING
ARE STILL EXPECTED OVER THE SOUTHEAST PART OF THE COUNTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT SUNDAY
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 3433 8415 3424 8420 3416 8408 3426 8396

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 9:54 PM EDT	Severe Thunderstorm Warning	FFC	Clayton, Fulton	36 min
Jun 30, 10:27 PM EDT	Severe Thunderstorm Warning	FFC	Clayton, Fayette	48 min
Jul 1, 12:52 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Lumpkin	23 min
Jul 1, 1:13 PM EDT	Severe Thunderstorm Warning	FFC	Dawson	47 min
Jul 1, 1:22 PM EDT	Severe Thunderstorm Warning	FFC	Forsyth, Hall	53 min
Jul 1, 2:45 PM EDT	Severe Thunderstorm Warning	FFC	Jackson	60 min
Jul 1, 2:58 PM EDT	Severe Thunderstorm Warning	FFC	Bartow	62 min
Jul 1, 3:37 PM EDT	Severe Thunderstorm Warning	FFC	Dodge	23 min
Jul 1, 3:53 PM EDT	Severe Thunderstorm Warning	FFC	Cherokee	52 min
Jul 1, 4:48 PM EDT	Severe Thunderstorm Warning	FFC	Glascock	27 min
Jul 1, 5:07 PM EDT	Severe Thunderstorm Warning	FFC	Jefferson	38 min
Jul 1, 5:40 PM EDT	Severe Thunderstorm Warning	FFC	Jefferson, Washington	50 min
Jul 1, 5:50 PM EDT	Severe Thunderstorm Warning	FFC	Clayton	20 min
Jul 1, 6:22 PM EDT	Severe Thunderstorm Warning	FFC	Heard	38 min
Jul 1, 6:22 PM EDT	Severe Thunderstorm Warning	FFC	Henry	38 min
Jul 1, 7:04 PM EDT	Severe Thunderstorm Warning	FFC	Coweta	25 min
Jul 1, 7:09 PM EDT	Severe Thunderstorm Warning	FFC	Butts	25 min
Jul 1, 7:31 PM EDT	Severe Thunderstorm Warning	FFC	Meriwether	44 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2007 Every severe thunderstorm warning in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.