Alert archive / South Carolina / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 128, NWS Columbia, SC

July 12, 2010Lancaster County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jul 12, 2010, 1:57 PM EDT for Lancaster County, South Carolina. It was in force for 63 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: Jul 12, 2010, 1:57 PM EDT (17:57 UTC)
Expired: Jul 12, 2010, 3:00 PM EDT
In force: 63 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

County Lancaster County, SC

The radar

The Columbia radar (KCAE), 90 km from the middle of the area, began a volume at 18:00 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 12, 1:14 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.0 hours before the alert went out and 171 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: 2227 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 533 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.5

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 Jul 12, 1:51 PM EDT, 6 minutes earlier.

Area forecast discussion, Jul 12, 1:51 PM EDT, 6 minutes before

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Hazardous weather outlook, Jul 12, 5:07 AM EDT, 8 hours 50 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE COLUMBIA SC
507 AM EDT MON JUL 12 2010

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-130907-
AIKEN-BAMBERG-BARNWELL-BURKE-CALHOUN-CHESTERFIELD-CLARENDON-COLUMBIA-
EDGEFIELD-FAIRFIELD-KERSHAW-LANCASTER-LEE-LEXINGTON-LINCOLN-MCCORMICK-
MCDUFFIE-NEWBERRY-ORANGEBURG-RICHLAND-RICHMOND-SALUDA-SUMTER-
507 AM EDT MON JUL 12 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MIDLANDS OF SOUTH CAROLINA
AND THE CENTRAL SAVANNAH RIVER AREA OF GEORGIA.

.DAY ONE...TODAY AND TONIGHT
SCATTERED THUNDERSTORMS THIS AFTERNOON AND EVENING. A FEW
STORMS MAY PRODUCE LOCALLY HEAVY DOWNPOURS. ISOLATED SEVERE
WIND GUSTS IN EXCESS OF 60 MPH ARE POSSIBLE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.

In the hours before

Local storm report, Jul 12, 9:39 AM EDT, 4 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
939 AM EDT MON JUL 12 2010

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

0425 PM     TSTM WND DMG     6 SSW TRENTON           33.67N 81.88W
07/11/2010                   EDGEFIELD          SC   DEPT OF HIGHWAYS

            TREES DOWNED ON HWY 121 AND BETTIS ACADEMY ROAD

&&

Local storm report, Jul 12, 9:45 AM EDT, 4 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
945 AM EDT MON JUL 12 2010

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

0430 PM     TSTM WND DMG     6 WNW SUMTER            33.98N 80.49W
07/11/2010                   SUMTER             SC   PUBLIC

            TREES DOWNED IN CHERRYVALE

&&

Local storm report, Jul 12, 9:45 AM EDT, 4 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE COLUMBIA SC
945 AM EDT MON JUL 12 2010

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

0430 PM     TSTM WND DMG     4 WNW SUMTER            33.96N 80.45W
07/11/2010                   SUMTER             SC   PUBLIC

            TREES DOWNED IN CHERRYVALE

&&

Special weather statement, Jul 12, 1:47 PM EDT, 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
147 PM EDT MON JUL 12 2010

GAZ077-121845-
BURKE-
147 PM EDT MON JUL 12 2010

...STRONG THUNDERSTORMS WERE AFFECTING BURKE COUNTY...

AT 145 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES NORTH OF
LOUISVILLE TO 7 MILES WEST OF WADLEY...OR ALONG A LINE EXTENDING FROM
22 MILES WEST OF WAYNESBORO TO 34 MILES WEST OF MILLEN...MOVING
SOUTHEAST AT 15 MPH.

WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE STORMS.

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

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

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 2:55 PM EDT	Tornado Warning	CAE	Chesterfield, Lancaster	50 min
Jul 12, 3:03 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Lancaster	42 min
Jul 12, 3:18 PM EDT	Severe Thunderstorm Warning	CAE	Edgefield, McCormick	57 min
Jul 12, 3:20 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Orangeburg	40 min
Jul 12, 3:31 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Barnwell, Orangeburg	44 min
Jul 12, 3:45 PM EDT	Severe Thunderstorm Warning	CAE	Richland, Sumter	45 min
Jul 12, 3:49 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Lancaster	41 min
Jul 12, 4:12 PM EDT	Tornado Warning	CAE	Lancaster	48 min
Jul 12, 4:20 PM EDT	Tornado Warning	CAE	Richland, Sumter	25 min
Jul 12, 4:26 PM EDT	Severe Thunderstorm Warning	CAE	Orangeburg	49 min
Jul 12, 4:30 PM EDT	Severe Thunderstorm Warning	CAE	Richland, Sumter	45 min
Jul 12, 4:37 PM EDT	Areal Flood Advisory	CAE	Richland, Sumter	113 min
Jul 12, 4:44 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Orangeburg, Richland	46 min
Jul 12, 4:58 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Clarendon, Orangeburg, Sumter	62 min
Jul 12, 5:13 PM EDT	Tornado Warning	CAE	Clarendon, Lee, Sumter	47 min
Jul 12, 5:17 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Calhoun, Orangeburg	20 min
Jul 12, 5:26 PM EDT	Tornado Warning	CAE	Calhoun, Clarendon, Orangeburg	49 min
Jul 12, 5:53 PM EDT	Areal Flood Advisory	CAE	Calhoun, Clarendon, Kershaw, Lee, Orangeburg, Richland and 1 more	112 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2010 Every severe thunderstorm warning in 2010

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.