Alert archive / Georgia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 97, NWS Atlanta, GA

May 11, 2007Polk County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 11, 2007, 5:29 PM EDT for Polk 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: May 11, 2007, 5:29 PM EDT (21:29 UTC)
Expired: May 11, 2007, 6:15 PM EDT
In force: 46 min
Issued by: NWS Atlanta, GA
Area: Counties, with a storm outline in the text

County Polk County, GA

The radar

The Atlanta radar (KFFC), 99 km from the middle of the area, began a volume at 21:31 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
May 11, 5:35 PM EDT	HAIL 0.75	5 Sw Cedartown, GA	HAIL MOSTLY MARBLE SIZED OR SMALLER...BUT A FEW AS LARGE AS PENNIES.

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, 9.5 hours before the alert went out and 103 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: 1410 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -6 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 112129
SVRFFC
GAC233-112215-
/O.NEW.KFFC.SV.W.0097.070511T2129Z-070511T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
529 PM EDT FRI MAY 11 2007

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN POLK COUNTY IN NORTHWEST GEORGIA

* UNTIL 615 PM EDT

* AT 527 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZED HAIL.  THIS   
  STORM WAS LOCATED NEAR ETNA.  THIS STORM WAS NEARLY STATIONARY...
  BUT DID SHOW A VERY SLOW DEVELOPMENT TO THE NORTHEAST TOWARD
  CEDARTOWN.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ESOM
  HILL.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

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 3391 8535 3391 8538 3402 8540 3403 8541
      3407 8540 3407 8537 3401 8519 3390 8523
      3390 8533

$$

1 follow-up statement

000 
WWUS52 KFFC 112213
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
612 PM EDT FRI MAY 11 2007

GAC233-112222-
/O.EXP.KFFC.SV.W.0097.000000T0000Z-070511T2215Z/
POLK GA-
612 PM EDT FRI MAY 11 2007

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN POLK COUNTY EXPIRES AT
615 PM EDT...

AT 609 PM EDT...THE THUNDERSTORM IN WESTERN POLK COUNTY WHICH WAS
EARLIER DETERMINED TO BE SEVERE...HAS WEAKENED AND IS NO LONGER
SEVERE.  A THUNDERSTORM REMAINS BETWEEN CEDARTOWN AND ARAGON...BUT
IS NOT CURRENTLY SEVERE.  THE STORMS ARE NEARLY STATIONARY.

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 3391 8535 3391 8538 3402 8540 3403 8541
      3407 8540 3407 8537 3401 8519 3390 8523
      3390 8533

$$


19

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 6:06 PM EDT	Severe Thunderstorm Warning	FFC	Bartow	39 min
May 11, 6:34 PM EDT	Severe Thunderstorm Warning	FFC	Cobb	41 min
May 11, 7:02 PM EDT	Severe Thunderstorm Warning	FFC	Fulton	43 min
May 11, 7:43 PM EDT	Severe Thunderstorm Warning	FFC	Henry	23 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.