Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 314, NWS Atlanta, GA

August 1, 2012Chattooga County, Floyd County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 1, 2012, 3:51 PM EDT for Chattooga County, Floyd County, Georgia. It was in force for 39 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: Aug 1, 2012, 3:51 PM EDT (19:51 UTC)
Expired: Aug 1, 2012, 4:30 PM EDT
In force: 39 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Chattooga County, GA, Floyd County, GA

The radar

The Northeast Alabama radar (KHTX), 102 km from the middle of the area, began a volume at 19:52 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
Aug 1, 4:14 PM EDT	TSTM WND DMG	3 S Subligna, GA	CHATTOGA COUNTY EM RELAYED A REPORT OF THREE TREES DOWN IN THE COUNTY. TIME IS BASED ON RADAR.

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, 7.9 hours before the alert went out and 132 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: 1144 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 595 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

993 
WUUS52 KFFC 011951
SVRFFC
GAC055-115-012030-
/O.NEW.KFFC.SV.W.0314.120801T1951Z-120801T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
351 PM EDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CHATTOOGA COUNTY IN NORTHWEST GEORGIA
  NORTHERN FLOYD COUNTY IN NORTHWEST GEORGIA

* UNTIL 430 PM EDT

* AT 347 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZED HAIL...AND
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  SOUTHEAST OF TRION...MOVING SOUTH AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROME
  AND SHANNON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

IF YOU SEE WIND DAMAGE...HAIL OR 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. YOU CAN ALSO TWEET YOUR REPORT USING HASHTAG GAWX.

&&

LAT...LON 3459 8536 3458 8512 3450 8509 3447 8509
      3446 8511 3443 8509 3442 8511 3440 8509
      3440 8504 3435 8502 3423 8503 3422 8539
TIME...MOT...LOC 1952Z 345DEG 14KT 3449 8521

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:41 PM EDT	Special Weather Statement	FFC	Catoosa, Walker, Whitfield	64 min
Jul 31, 10:51 PM EDT	Special Weather Statement	FFC	Towns, Union	24 min
Jul 31, 11:18 PM EDT	Special Weather Statement	FFC	Lumpkin, Towns, Union, White	27 min
Aug 1, 3:33 PM EDT	Special Weather Statement	FFC	Chattooga	57 min
Aug 1, 4:16 PM EDT	Special Weather Statement	FFC	Forsyth	44 min
Aug 1, 4:21 PM EDT	Special Weather Statement	FFC	Catoosa, Whitfield	39 min
Aug 1, 4:23 PM EDT	Severe Thunderstorm Warning	FFC	Forsyth, Gwinnett, Hall	52 min
Aug 1, 4:28 PM EDT	Special Weather Statement	FFC	Floyd	47 min
Aug 1, 4:48 PM EDT	Severe Thunderstorm Warning	FFC	Floyd	42 min
Aug 1, 4:57 PM EDT	Special Weather Statement	FFC	Gordon, Murray	33 min
Aug 1, 5:10 PM EDT	Special Weather Statement	FFC	Dawson	50 min
Aug 1, 5:13 PM EDT	Severe Thunderstorm Warning	FFC	Gilmer, Gordon, Murray, Pickens	47 min
Aug 1, 6:05 PM EDT	Special Weather Statement	FFC	Gilmer, Pickens	40 min
Aug 1, 6:17 PM EDT	Special Weather Statement	FFC	Dooly	28 min
Aug 1, 6:19 PM EDT	Special Weather Statement	FFC	Dade, Walker	41 min
Aug 1, 6:26 PM EDT	Special Weather Statement	FFC	Henry, Rockdale	49 min
Aug 1, 6:49 PM EDT	Severe Thunderstorm Warning	FFC	Chattooga, Walker	41 min
Aug 1, 7:23 PM EDT	Severe Thunderstorm Warning	FFC	Chattooga, Walker	52 min
Aug 1, 7:39 PM EDT	Special Weather Statement	FFC	Fannin, Towns, Union	51 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2012 Every severe thunderstorm warning in 2012

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.