Alert archive / South Carolina / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 165, NWS Charleston, SC

July 31, 2010Allendale County, Hampton County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jul 31, 2010, 6:27 PM EDT for Allendale County, Hampton 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 31, 2010, 6:27 PM EDT (22:27 UTC)
Expired: Jul 31, 2010, 7:30 PM EDT
In force: 63 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

Counties Allendale County, SC, Hampton County, SC

The radar

The Charleston,SC radar (KCLX), 32 km from the middle of the area, began a volume at 22:30 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 31, 1:31 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.5 hours before the alert went out and 117 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: 1232 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

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 Charleston, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 31, 5:56 PM EDT, 31 minutes earlier.

Area forecast discussion, Jul 31, 5:56 PM EDT, 31 minutes before

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Hazardous weather outlook, Jul 31, 6:09 PM EDT, 18 minutes before

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In the hours before

Special weather statement, Jul 31, 4:06 PM EDT, 2 hours 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
406 PM EDT SAT JUL 31 2010

GAZ099-114-115-312045-
CANDLER-EVANS-TATTNALL-
406 PM EDT SAT JUL 31 2010

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF EVANS...TATTNALL AND
CANDLER COUNTIES THROUGH 445 PM EDT...

AT 402 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS...ALONG A LINE EXTENDING FROM EXCELSIOR TO
MANASSAS...MOVING EAST AT 5 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
BELLVILLE...CLAXTON...COLLINS...DAISY...HAGAN...MANASSAS...METTER...
PULASKI AND REIDSVILLE...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
GUSTY WINDS OF 40 TO 50 MPH...
DIME SIZE HAIL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD-TO-GROUND LIGHTNING IS OCCURRING. POSTPONE OUTDOOR
ACTIVITIES PROMPTLY. SEEK SHELTER INSIDE AN ENCLOSED BUILDING.

&&

LAT...LON 3241 8206 3242 8193 3240 8191 3228 8195
      3227 8196 3227 8189 3224 8184 3224 8182
      3222 8180 3205 8185 3207 8218
TIME...MOT...LOC 2006Z 291DEG 4KT 3233 8199 3215 8205

Special weather statement, Jul 31, 4:46 PM EDT, 1 hour 41 minutes before

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Special weather statement, Jul 31, 4:59 PM EDT, 1 hour 28 minutes before

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Local storm report, Jul 31, 5:27 PM EDT, 1 hour before

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Local storm report, Jul 31, 6:14 PM EDT, 13 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 4:06 PM EDT	Special Weather Statement	CHS	Evans	39 min
Jul 31, 4:46 PM EDT	Special Weather Statement	CHS	Screven	29 min
Jul 31, 4:59 PM EDT	Special Weather Statement	CHS	Tattnall	46 min
Jul 31, 5:48 PM EDT	Heat Advisory	CHS	Bulloch, Candler, Effingham, Evans, Jenkins, Long and 2 more	26 hr
Jul 31, 5:57 PM EDT	Severe Thunderstorm Warning	CHS	Screven	63 min
Jul 31, 6:28 PM EDT	Areal Flood Advisory	CHS	Jenkins, Screven	2 hr
Jul 31, 7:00 PM EDT	Special Weather Statement	CHS	Jenkins, Screven	45 min
Jul 31, 5:23 PM EDT	Severe Thunderstorm Warning	CHS	Allendale, Colleton, Hampton	67 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.