Alert archive / Georgia / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 414, NWS Atlanta, GA

October 21, 2005Cobb County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Oct 21, 2005, 6:15 PM EDT for Cobb 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: Oct 21, 2005, 6:15 PM EDT (22:15 UTC)
Expired: Oct 21, 2005, 6:45 PM EDT
In force: 30 min
Issued by: NWS Atlanta, GA
Area: Counties, with a storm outline in the text

County Cobb County, GA

The radar

The Atlanta radar (KFFC), 71 km from the middle of the area, began a volume at 22:16 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 nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.3 hours before the alert went out and 71 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: 2 J/kg
Mixed-layer CIN: -266 J/kg
Mixed-layer LCL: 1051 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 63 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 212216
SVRFFC
GAC067-212245-
/O.NEW.KFFC.SV.W.0414.051021T2215Z-051021T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
615 PM EDT FRI OCT 21 2005

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 645 PM EDT

* AT 611 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZED HAIL.  THIS   
  STORM WAS LOCATED JUST SOUTH OF ACWORTH...AND MOVING EAST AT 30    
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WHITEWATER...MARIETTA AND KENNESAW.

THIS STORM HAS A HISTORY OF PRODUCING HAIL THE SIZE OF PENNIES. 
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS

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 3405 8473 3393 8471 3390 8444 3409 8442

$$

1 follow-up statement

000 
WWUS52 KFFC 212237
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
635 PM EDT FRI OCT 21 2005

GAC067-212245-
/O.CON.KFFC.SV.W.0414.000000T0000Z-051021T2245Z/
COBB GA-
635 PM EDT FRI OCT 21 2005

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT 
FOR COBB COUNTY...

AT 631 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZED HAIL.
THIS STORM WAS LOCATED NEAR WHITEWATER...OR ABOUT NEAR 
MARIETTA...MOVING EAST AT 35 MPH.  THIS STORM IS WEAKENING AND THE 
WARNING WILL LIKELY BE ALLOWED TO EXPIRE AT 645 PM.  AFTER 
THAT...SMALL HAIL AND WIND GUSTS TO 40 MPH MAY STILL OCCUR IN COBB 
AND FULTON COUNTIES AS THE STORM CONTINUES TO MOVE EAST AND WEAKEN.

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 3405 8473 3393 8471 3390 8444 3409 8442

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 21, 4:18 PM EDT	Severe Thunderstorm Warning	FFC	Chattooga	36 min
Oct 21, 4:48 PM EDT	Severe Thunderstorm Warning	FFC	Gordon	22 min
Oct 21, 4:49 PM EDT	Severe Thunderstorm Warning	FFC	Floyd	26 min
Oct 21, 4:54 PM EDT	Severe Thunderstorm Warning	FFC	Polk	36 min
Oct 21, 5:47 PM EDT	Severe Thunderstorm Warning	FFC	Paulding, Polk	38 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2005 Every severe thunderstorm warning in 2005

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.