Alert archive / South Carolina / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 136, NWS Columbia, SC

July 21, 20154 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jul 21, 2015, 6:21 PM EDT for 4 counties in South Carolina. It was in force for 54 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 21, 2015, 6:21 PM EDT (22:21 UTC)
Expired: Jul 21, 2015, 7:15 PM EDT
In force: 54 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

Counties Chesterfield County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC

The radar

The Columbia radar (KCAE), 85 km from the middle of the area, began a volume at 22:23 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, 10.4 hours before the alert went out and 178 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: 992 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1106 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 80 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 Jul 21, 2:41 PM EDT, 3 hours 40 minutes earlier.

Area forecast discussion, Jul 21, 2:41 PM EDT, 3 hours 40 minutes before

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Hazardous weather outlook, Jul 21, 5:09 AM EDT, 13 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE COLUMBIA SC
509 AM EDT TUE JUL 21 2015

GAZ063>065-077-SCZ016-022-025-027>031-035>038-041-220915-
MCDUFFIE-COLUMBIA-RICHMOND-BURKE-CHESTERFIELD-KERSHAW-EDGEFIELD-
LEXINGTON-RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-
CLARENDON-BAMBERG-
509 AM EDT TUE JUL 21 2015

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

.DAY ONE...TODAY AND TONIGHT
PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   HEAT ADVISORY.

A FEW THUNDERSTORMS THIS AFTERNOON AND EVENING COULD CONTAIN
STRONG AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

GAZ040-SCZ015-018-020-021-026-220915-
LINCOLN-LANCASTER-MCCORMICK-NEWBERRY-FAIRFIELD-SALUDA-
509 AM EDT TUE JUL 21 2015

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

.DAY ONE...TODAY AND TONIGHT

A FEW THUNDERSTORMS THIS AFTERNOON AND EVENING COULD CONTAIN
STRONG AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Special weather statement, Jul 21, 5:17 PM EDT, 1 hour 4 minutes before

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Special weather statement, Jul 21, 5:47 PM EDT, 34 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 8:15 PM EDT	Special Weather Statement	CAE	Aiken	30 min
Jul 20, 8:16 PM EDT	Special Weather Statement	CAE	Lancaster	29 min
Jul 20, 8:40 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell	38 min
Jul 20, 9:35 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Barnwell, Orangeburg	40 min
Jul 21, 5:09 AM EDT	Heat Advisory	CAE	Aiken, Bamberg, Barnwell, Calhoun, Chesterfield, Clarendon and 6 more	15 hr
Jul 21, 5:17 PM EDT	Special Weather Statement	CAE	Lancaster	58 min
Jul 21, 5:47 PM EDT	Special Weather Statement	CAE	Kershaw, Lancaster	58 min
Jul 20, 8:00 PM EDT	Special Weather Statement	CAE	Richmond	30 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2015 Every severe thunderstorm warning in 2015

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.