Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 201, NWS Atlanta, GA

April 27, 2011Catoosa County, Murray County, Whitfield County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 27, 2011, 8:42 AM EDT for Catoosa County, Murray County, Whitfield County, Georgia. It was in force for 48 min. 2 reports 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: Apr 27, 2011, 8:42 AM EDT (12:42 UTC)
Expired: Apr 27, 2011, 9:30 AM EDT
In force: 48 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Catoosa County, GA, Murray County, GA, Whitfield County, GA

The radar

The Northeast Alabama radar (KHTX), 114 km from the middle of the area, began a volume at 12:45 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
Apr 27, 8:59 AM EDT	TSTM WND DMG	2 Nw Dalton, GA	WHITFIELD COUNTY EMA RELAYED A REPORT OF SEVERAL TREES DOWN NW OF DALTON.
Apr 27, 8:59 AM EDT	TSTM WND DMG	Dalton, GA	WHITFIELD 911 RELAYED A REPORT OF TWO TREES DOWN.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 27, 7:48 AM EDT	Tornado Watch	SPC	2 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 0.7 hours before the alert went out and 174 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: 748 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 501 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 345 m²/s²
0-3 km storm-relative helicity: 460 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 5.4

Open this sounding in Storm Lab

The text

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

459 
WUUS52 KFFC 271242
SVRFFC
GAC047-213-313-271330-
/O.NEW.KFFC.SV.W.0201.110427T1242Z-110427T1330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
842 AM EDT WED APR 27 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CATOOSA COUNTY IN NORTHWEST GEORGIA
  NORTHERN MURRAY COUNTY IN NORTHWEST GEORGIA
  NORTHERN WHITFIELD COUNTY IN NORTHWEST GEORGIA

* UNTIL 930 AM EDT

* AT 836 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS UP TO 70
  MPH.  THIS STORM WAS LOCATED NEAR LAFAYETTE...MOVING NORTHEAST AT 
  60 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DALTON...RINGGOLD...VARNELL AND COHUTTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED WEAK ROTATION WITHIN THIS STORM. ALTHOUGH
CURRENT DATA DOES NOT INDICATE THE EXISTENCE OF A TORNADO...A TORNADO
MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO
A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR
SMALL INTERIOR ROOM.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON EDT WEDNESDAY FOR
NORTHERN GEORGIA.

&&

LAT...LON 3488 8462 3489 8467 3475 8496 3498 8519
      3499 8518 3500 8463
TIME...MOT...LOC 1242Z 229DEG 49KT 3473 8529

$$

1 follow-up statement

465 
WWUS52 KFFC 271321
SVSFFC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
921 AM EDT WED APR 27 2011

GAC047-271330-
/O.CAN.KFFC.SV.W.0201.000000T0000Z-110427T1330Z/
CATOOSA GA-
921 AM EDT WED APR 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CATOOSA COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON EDT WEDNESDAY FOR
NORTHERN GEORGIA.

LAT...LON 3488 8462 3489 8467 3475 8496 3486 8507
      3488 8501 3491 8502 3491 8501 3497 8499
      3499 8498 3499 8463
TIME...MOT...LOC 1320Z 235DEG 40KT 3494 8489

$$

GAC213-313-271330-
/O.CON.KFFC.SV.W.0201.000000T0000Z-110427T1330Z/
WHITFIELD GA-MURRAY GA-
921 AM EDT WED APR 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 AM EDT
FOR NORTHERN MURRAY AND NORTHERN WHITFIELD COUNTIES...

AT 918 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS UP
TO 60 MPH. THIS STORM WAS LOCATED NEAR COHUTTA...MOVING NORTHEAST AT
45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
BEAVERDALE...SUMAC...CRANDALL...GREGORY...CISCO AND TENNGA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON EDT WEDNESDAY FOR
NORTHERN GEORGIA.

&&

LAT...LON 3488 8462 3489 8467 3475 8496 3486 8507
      3488 8501 3491 8502 3491 8501 3497 8499
      3499 8498 3499 8463
TIME...MOT...LOC 1320Z 235DEG 40KT 3494 8489

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 8:04 AM EDT	Severe Thunderstorm Warning	FFC	Bartow, Chattooga, Floyd, Haralson, Polk	56 min
Apr 27, 8:16 AM EDT	Tornado Warning	FFC	Catoosa, Chattooga, Dade, Walker, Whitfield	44 min
Apr 27, 8:25 AM EDT	Tornado Warning	FFC	Dade, Walker	35 min
Apr 27, 8:28 AM EDT	Severe Thunderstorm Warning	FFC	Carroll, Haralson, Heard	32 min
Apr 27, 8:35 AM EDT	Severe Thunderstorm Warning	FFC	Bartow, Cherokee, Cobb, Gilmer, Gordon, Murray and 5 more	55 min
Apr 27, 8:51 AM EDT	Severe Thunderstorm Warning	FFC	Clayton, Coweta, Douglas, Fayette, Fulton	29 min
Apr 27, 8:54 AM EDT	Tornado Warning	FFC	Gilmer, Gordon, Murray, Whitfield	51 min
Apr 27, 9:02 AM EDT	Severe Thunderstorm Warning	FFC	Catoosa, Dade, Walker	16 min
Apr 27, 9:26 AM EDT	Severe Thunderstorm Warning	FFC	Fannin, Gilmer, Murray	39 min
Apr 27, 1:59 PM EDT	Severe Thunderstorm Warning	FFC	Dade, Walker	61 min
Apr 27, 2:25 PM EDT	Tornado Warning	FFC	Dade, Walker	34 min
Apr 27, 2:37 PM EDT	Severe Thunderstorm Warning	FFC	Catoosa, Whitfield	25 min
Apr 27, 5:07 PM EDT	Severe Thunderstorm Warning	FFC	Dade, Walker	38 min
Apr 27, 5:14 PM EDT	Tornado Warning	FFC	Dade, Walker	46 min
Apr 27, 5:51 PM EDT	Tornado Warning	FFC	Catoosa	24 min
Apr 27, 5:53 PM EDT	River Flood Warning	FFC	Dade	11 hr
Apr 27, 6:03 PM EDT	Severe Thunderstorm Warning	FFC	Catoosa, Walker	27 min
Apr 27, 6:15 PM EDT	Severe Thunderstorm Warning	FFC	Dade	30 min
Apr 27, 7:20 PM EDT	Severe Thunderstorm Warning	FFC	Chattooga, Dade, Walker	55 min
Apr 27, 7:32 PM EDT	Tornado Warning	FFC	Chattooga, Dade, Walker	43 min
Apr 27, 7:59 PM EDT	Tornado Warning	FFC	Catoosa, Walker, Whitfield	46 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011 Every severe thunderstorm warning in 2011

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.