Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 4, NWS Columbia, SC

February 24, 2012Columbia County, Georgia

NWS Columbia, SC issued this severe thunderstorm warning at Feb 24, 2012, 12:20 PM EST for Columbia County, Georgia. It was in force for 25 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: Feb 24, 2012, 12:20 PM EST (17:20 UTC)
Expired: Feb 24, 2012, 12:45 PM EST
In force: 25 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

County Columbia County, GA

The radar

The Columbia radar (KCAE), 112 km from the middle of the area, began a volume at 17:20 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, 12:25 PM EST	HAIL 1	Harlem, GA	ONE INCH HAIL REPORTED IN HARLEM GA.
Feb 24, 12:30 PM EST	HAIL 1	Grovetown, GA

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, 5.3 hours before the alert went out and 211 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.

768 
WUUS52 KCAE 241720
SVRCAE
GAC073-241745-
/O.NEW.KCAE.SV.W.0004.120224T1720Z-120224T1745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
1220 PM EST FRI FEB 24 2012

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

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

* UNTIL 1245 PM EST

* AT 1215 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 NORTH OF
  HARLEM...OR 9MILES NORTHWEST OF GROVETOWN...AND MOVING NORTHEAST 
  AT 75 MPH. THIS STORM HAS TAKEN DOWN SOME TREES IN MCDUFFIE COUNTY.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE MARTINEZ...HARLEM...
  GROVETOWN AND EVANS

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 3367 8220 3363 8220 3359 8214 3360 8210
      3356 8205 3354 8203 3336 8230 3351 8240
      3353 8239 3355 8242 3357 8244
TIME...MOT...LOC 1718Z 247DEG 64KT 3356 8222

$$

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, 12:06 PM EST	Severe Thunderstorm Warning	CAE	McDuffie	24 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.