Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 3, NWS Columbia, SC

February 24, 2012McDuffie County, Georgia

NWS Columbia, SC issued this severe thunderstorm warning at Feb 24, 2012, 12:06 PM EST for McDuffie County, Georgia. It was in force for 24 min. 3 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: Feb 24, 2012, 12:06 PM EST (17:06 UTC)
Expired: Feb 24, 2012, 12:30 PM EST
In force: 24 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

County McDuffie County, GA

The radar

The Robins AFB radar (KJGX), 122 km from the middle of the area, began a volume at 17:08 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
Feb 24, 12:15 PM EST	TSTM WND DMG	4 W Thomson, GA	TREES DOWN ON HWY 278 JUST NORTH OF I-20 WEST OF THOMPSON
Feb 24, 12:15 PM EST	TSTM WND DMG	Dearing, GA	TREES AND POWER LINES DOWN IN DEARING AREA.
Feb 24, 12:20 PM EST	TSTM WND DMG	5 S Thomson, GA	LAW ENFORCEMENT REPORTS NUMEROUS TREES AND POWER LINES DOWN ACROSS THE SOUTHERN PORTION OF THE COUNTY.

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
Feb 24, 8:48 AM EST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 5.1 hours before the alert went out and 190 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: 1231 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 542 m above ground
0-6 km bulk shear: 83 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 306 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

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

721 
WUUS52 KCAE 241706
SVRCAE
GAC189-241730-
/O.NEW.KCAE.SV.W.0003.120224T1706Z-120224T1730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
1206 PM EST FRI FEB 24 2012

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MCDUFFIE COUNTY IN EAST CENTRAL GEORGIA

* UNTIL 1230 PM EST

* AT 1205 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES WEST OF THOMSON...AND
  MOVING EAST AT 60 MPH.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE THOMSON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

REPORT LARGE HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY
SHERIFF...OR CALL THE NATIONAL WEATHER SERVICE...TOLL FREE 1 877 6 3
3...6 7 7 2.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY AFTERNOON
FOR EAST CENTRAL GEORGIA AND CENTRAL SOUTH CAROLINA.

&&

LAT...LON 3364 8246 3358 8242 3355 8244 3354 8240
      3349 8240 3342 8234 3340 8234 3336 8230
      3331 8236 3335 8255 3341 8255 3346 8260
      3353 8262 3354 8262
TIME...MOT...LOC 1706Z 251DEG 52KT 3347 8250

$$

SJN

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 24, 4:18 AM EST	Lake Wind Advisory	CAE	Burke, Columbia, Lincoln, McDuffie, Richmond	38 hr
Feb 24, 12:20 PM EST	Severe Thunderstorm Warning	CAE	Columbia	25 min
Feb 24, 12:28 PM EST	Severe Thunderstorm Warning	CAE	Columbia, Richmond	32 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.