Alert archive / Georgia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 325, NWS Atlanta, GA

July 29, 2007Montgomery County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 29, 2007, 6:34 PM EDT for Montgomery County, Georgia. It was in force for 26 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 29, 2007, 6:34 PM EDT (22:34 UTC)
Expired: Jul 29, 2007, 7:00 PM EDT
In force: 26 min
Issued by: NWS Atlanta, GA
Area: Counties, with a storm outline in the text

County Montgomery County, GA

The radar

The Robins AFB radar (KJGX), 92 km from the middle of the area, began a volume at 22:35 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 29, 6:40 PM EDT	TSTM WND DMG	2 E Mount Vernon, GA	FOUR TREES DOWN ON POWER LINES.

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

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.6 hours before the alert went out and 206 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: 1230 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS52 KFFC 292235
SVRFFC
GAC209-292300-
/O.NEW.KFFC.SV.W.0325.070729T2234Z-070729T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
634 PM EDT SUN JUL 29 2007

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL AND SOUTHERN MONTGOMERY COUNTY IN CENTRAL GEORGIA

* UNTIL 700 PM EDT

* AT 632 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZED HAIL.  
  THIS STORM WAS LOCATED BETWEEN AILEY AND GLENWOOD...MOVING EAST AT 
5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HIGGSTON AND ALSTON.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...EXCESSIVE 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 3229 8260 3213 8265 3204 8247 3226 8244

$$

1 follow-up statement

000 
WWUS52 KFFC 292302
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
702 PM EDT SUN JUL 29 2007

GAC209-292312-
/O.EXP.KFFC.SV.W.0325.000000T0000Z-070729T2300Z/
MONTGOMERY GA-
702 PM EDT SUN JUL 29 2007

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONTGOMERY COUNTY
EXPIRED AT 700 PM EDT...

THUNDERSTORMS HAVE WEAKENED CONSIDERABLY ACROSS EASTERN MONTGOMERY 
COUNTY AND ARE NO LONGER DETERMINED TO BE SEVERE.  MODERATE TO HEAVY 
RAIN AND FREQUENT CLOUD-TO-GROUND LIGHTNING WILL CONTINUE ACROSS 
EASTERN MONTGOMERY COUNTY FOR ANOTHER 15 TO 20 MINUTES.

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 3229 8260 3213 8265 3204 8247 3226 8244

$$


19

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 4:41 PM EDT	Severe Thunderstorm Warning	FFC	Laurens	34 min
Jul 29, 5:23 PM EDT	Severe Thunderstorm Warning	FFC	Wilcox	26 min
Jul 29, 5:26 PM EDT	Severe Thunderstorm Warning	FFC	Spalding	32 min
Jul 29, 6:52 PM EDT	Severe Thunderstorm Warning	FFC	Toombs	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.