Alert archive / South Carolina / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 178, NWS Columbia, SC

August 11, 2009Edgefield County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Aug 11, 2009, 7:44 PM EDT for Edgefield County, South Carolina. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 11, 2009, 7:44 PM EDT (23:44 UTC)
Expired: Aug 11, 2009, 8:30 PM EDT
In force: 46 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

County Edgefield County, SC

The radar

The Columbia radar (KCAE), 81 km from the middle of the area, began a volume at 23:45 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.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 11.7 hours before the alert went out and 207 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: 772 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Columbia, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 2:36 PM EDT, 5 hours 8 minutes earlier.

Area forecast discussion, Aug 11, 2:36 PM EDT, 5 hours 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
236 PM EDT TUE AUG 11 2009

.SYNOPSIS...
AN UPPER TROUGH...A SURFACE FRONT..AND INCREASING ATMOSPHERIC
MOISTURE WILL LEAD TO INCREASED RAIN CHANCES THIS WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
WEAKENING UPPER LEVEL RIDGE AXIS TO OUR SOUTH WITH UPPER TROUGH
MOVING SE ACROSS THE MIDWEST. SURFACE TROUGH CURRENTLY STRETCHED
ACROSS THE CENTRAL PART OF OUR FORECAST AREA. RADAR INDICATING
CONVECTION DEVELOPING ALONG IT. OTHER SURFACE FRONT TO OUR NORTH
APPROACHING THE MOUNTAINS...WHERE CONVECTION DEVELOPING ALONG IT AS
WELL. WILL EXPECT CONVECTION TO CONTINUE DEVELOPING ALONG THESE
BOUNDARIES AS THEY SHIFT SLOWLY SE TODAY/THIS EVENING.

&&

.SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/...
SOME SUBTLE DIFFERENCES BETWEEN GFS/NAM...BUT GENERAL CONSENSUS
IS UPPER TROUGHINESS TO CONTINUE DEVELOPING OVER THE EASTERN
CONUS...WITH A SURFACE BOUNDARY OR TWO IN OUR VICINITY...AND
ABUNDANT ATMOPSHERIC MOISTURE TO WORK WITH. WILL MAINTAIN A MOS
BLEND...WHICH PROVIDES LIKELY POPS FOR WED/THU. PROJECTED MODERATE
TO STRONG INSTABILITIES ALSO PROVIDES A SEVERE THREAT ALONG AND
SOUTH OF BOUNDARY. PRECIPITABLE WATER VALUES WELL OVER 2
INCHES...PLUS POSSIBLE TRAINING EFFECT ECHO MOVEMENT ALONG
BOUNDARY WILL ALSO PROVIDE A LOCALLY HEAVY RAIN/FLOODING THREAT AS
WELL.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
MODELS MAINTAIN INDICATIONS OF SLOWLY INCREASING UPPER HEIGHTS OVER
OUR REGION AS UPPER HIGH SLOWLY TRIES TO BUILD BACK NW TOWARD THE
SE US COAST. MODELS MAINTAIN COPIOUS ATMOSPHERIC MOISTURE FOR OUR
REGION...AND WILL CONTINUE TO EXPECT A CHANCE OF SHOWERS AND
THUNDERSTORMS THROUGH THE FORECAST PERIOD.

&&

.AVIATION /19Z TUESDAY THROUGH SUNDAY/...
A LEE SIDE TROF OVER THE MIDLANDS OF SOUTH CAROLINA AND EXTENDING
INTO THE CSRA WILL BE THE FOCUS OF SCATTERED THUNDERSTORMS THIS
AFTERNOON. STORMS WILL BE SCATTERED WIDELY ENOUGH TO ONLY MENTION
IN THE CLOUD IDENTIFIER AT ALL TERMINAL LOCATIONS. ACTIVITY WILL
DECREASE AFTER SUNSET. EXPECT VFR CONDITIONS TO PREVAIL AT ALL
LOCATIONS THROUGH TO EARLY WEDNESDAY MORNING EXCEPT IN
THUNDERSTORMS...WHEN THERE WILL BE A CHANCE OF MVFR FOG AT AGS
AND OGB. A DECK OF MIDLEVEL CLOUDINESS WILL OVERSPREAD THE LATER
WEDNESDAY MORNING AHEAD OF AN APPROACHING COLD FRONT.

PERIODS OF MVFR VISIBILITIES MAY BE ENCOUNTERED IN SHOWERS AND
THUNDERSTORMS ON WEDNESDAY.  OTHERWISE...NO SIGNIFICANT IMPACTS
EXPECTED DURING THE EXTENDED PERIOD.

&&

.CAE WATCHES/WARNINGS/ADVISORIES...
SC...NONE.
GA...NONE.

&&

Hazardous weather outlook, Aug 11, 10:53 AM EDT, 8 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE COLUMBIA SC
ISSUED BY NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1053 AM EDT TUE AUG 11 2009

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-121500-
LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD-
MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON-
RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON-
BAMBERG-
1053 AM EDT TUE AUG 11 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL GEORGIA AND
CENTRAL SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE THIS
THIS AFTERNOON AND TONIGHT. SOME OF THESE THUNDERSTORMS COULD BECOME SEVERE
AND PRODUCE DAMAGING WINDS...LARGE HAIL...HEAVY RAINFALL...AND
DANGEROUS CLOUD TO GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
DEVELOP IN A WARM AND UNSTABLE AIRMASS DURING THE AFTERNOON HOURS
ON WEDNESDAY AND THURSDAY. SOME STORMS MAY BE STRONG TO
SEVERE...WITH THE MAIN THREATS BEING DAMAGING WINDS AND HAIL.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

In the hours before

Local storm report, Aug 11, 4:58 PM EDT, 2 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
458 PM EDT TUE AUG 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0456 PM     TSTM WND DMG     ORANGEBURG              33.49N 80.87W
08/11/2009                   ORANGEBURG         SC   DEPT OF HIGHWAYS

            TREES DOWN ALONG PARTRIDGE LANE NEAR U.S. HIGHWAY 178

&&

CHERRY

Local storm report, Aug 11, 6:34 PM EDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
634 PM EDT TUE AUG 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0550 PM     TSTM WND DMG     AUGUSTA                 33.46N 82.00W
08/11/2009                   RICHMOND           GA   BROADCAST MEDIA

            REPORT FROM WAGT-TV 26 IN AUGUSTA REPORTED BRANCHES DOWN
            ON BROAD STREET WITH 48 MPH WINDS

&&

CHERRY

Local storm report, Aug 11, 6:35 PM EDT, 1 hour 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
635 PM EDT TUE AUG 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0550 PM     HAIL             AUGUSTA                 33.46N 82.00W
08/11/2009  E0.25 INCH       RICHMOND           GA   BROADCAST MEDIA

            WAGT-TV 26 IN AUGUSTA REPORTED PEA SIZE HAIL ON BROAD
            STREET

&&

CHERRY

Local storm report, Aug 11, 6:37 PM EDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
637 PM EDT TUE AUG 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0550 PM     TSTM WND DMG     AUGUSTA                 33.46N 82.00W
08/11/2009                   RICHMOND           GA   EMERGENCY MNGR

            RICHMOND COUNTY EMA REPORTED TREES DONW ON GREEN STREET
            IN AUGUSTA

&&

CHERRY

Local storm report, Aug 11, 6:38 PM EDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
638 PM EDT TUE AUG 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0550 PM     HAIL             AUGUSTA                 33.46N 82.00W
08/11/2009  E0.75 INCH       RICHMOND           GA   EMERGENCY MNGR

            RICHMOND COUNTY EMA REPORTED PENNY SIZE ALONG ON GREEN
            STREET IN AUGUSTA

&&

CHERRY

Local storm report, Aug 11, 7:35 PM EDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
735 PM EDT TUE AUG 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0725 PM     HAIL             PROSPERITY              34.21N 81.53W
08/11/2009  E0.25 INCH       NEWBERRY           SC   LAW ENFORCEMENT

            NEWBERRY COUNTY SHERIFFS DEPT REPORTED PEA SIZE HAIL ON
            WHEELAND ROAD

&&

CHERRY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 1:16 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Richland, Sumter	59 min
Aug 11, 3:20 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Orangeburg	25 min
Aug 11, 4:22 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell	38 min
Aug 11, 6:19 PM EDT	Severe Thunderstorm Warning	CAE	Aiken	41 min
Aug 11, 7:43 PM EDT	Severe Thunderstorm Warning	CAE	Lexington, Richland	47 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2009 Every severe thunderstorm warning in 2009

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.