Alert archive / South Carolina / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 106, NWS Charleston, SC

July 31, 20134 counties in South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jul 31, 2013, 2:52 PM EDT for 4 counties in South Carolina. It was in force for 68 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, 2013, 2:52 PM EDT (18:52 UTC)
Expired: Jul 31, 2013, 4:00 PM EDT
In force: 68 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

Counties Beaufort County, SC, Colleton County, SC, Hampton County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 17 km from the middle of the area, began a volume at 18:56 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, 6.9 hours before the alert went out and 89 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: 2332 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 643 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

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, 2:01 PM EDT, 51 minutes earlier.

Area forecast discussion, Jul 31, 2:01 PM EDT, 51 minutes before

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Hazardous weather outlook, Jul 31, 4:45 AM EDT, 10 hours 7 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHARLESTON SC
445 AM EDT WED JUL 31 2013

GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>052-011100-
JENKINS-SCREVEN-CANDLER-BULLOCH-EFFINGHAM-TATTNALL-EVANS-
INLAND BRYAN-COASTAL BRYAN-INLAND CHATHAM-COASTAL CHATHAM-LONG-
INLAND LIBERTY-COASTAL LIBERTY-INLAND MCINTOSH-COASTAL MCINTOSH-
ALLENDALE-HAMPTON-INLAND COLLETON-DORCHESTER-INLAND BERKELEY-
INLAND JASPER-BEAUFORT-COASTAL COLLETON-CHARLESTON-COASTAL JASPER-
TIDAL BERKELEY-
445 AM EDT WED JUL 31 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST GEORGIA AND
SOUTHEAST SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

FLOODING...SHOWERS AND THUNDERSTORMS WILL BECOME MORE NUMEROUS
THIS AFTERNOON AND EVENING. DUE TO VERY MOIST CONDITIONS AND SLOW
STORM MOTION...HEAVY RAINFALL MAY CAUSE LOCALIZED FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

PLEASE RELAY ANY REPORTS OF HAZARDOUS WEATHER INCLUDING...BUT NOT
LIMITED TO LARGE HAIL...DAMAGING WINDS...AND FLOODING TO THE
NATIONAL WEATHER SERVICE IN CHARLESTON AT 1-888-383-2024.

AMZ330-350-352-354-374-011100-
CHARLESTON HARBOR-
WATERS FROM SOUTH SANTEE RIVER TO EDISTO BEACH SC OUT 20 NM-
WATERS FROM EDISTO BEACH SC TO SAVANNAH GA OUT 20 NM-
WATERS FROM SAVANNAH GA TO ALTAMAHA SOUND GA OUT 20 NM...INCLUDING
GRAYS REEF NATIONAL MARINE SANCTUARY-
WATERS FROM SAVANNAH GA TO ALTAMAHA SOUND GA EXTENDING FROM 20 TO
60 NM-
445 AM EDT WED JUL 31 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

PLEASE RELAY ANY REPORTS OF HAZARDOUS WEATHER INCLUDING...BUT NOT
LIMITED TO LARGE HAIL...DAMAGING WINDS...AND FLOODING TO THE
NATIONAL WEATHER SERVICE IN CHARLESTON AT 1-888-383-2024.

In the hours before

Local storm report, Jul 31, 11:06 AM EDT, 3 hours 46 minutes before

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Local storm report, Jul 31, 11:09 AM EDT, 3 hours 43 minutes before

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Special weather statement, Jul 31, 2:05 PM EDT, 47 minutes before

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Special weather statement, Jul 31, 2:26 PM EDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
226 PM EDT WED JUL 31 2013

SCZ042-047-311900-
HAMPTON-INLAND JASPER-
226 PM EDT WED JUL 31 2013

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF HAMPTON AND JASPER
COUNTIES THROUGH 300 PM EDT...

AT 223 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM...NEAR GILLISONVILLE...MOVING NORTH AT 15 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
GILLISONVILLE...COOSAWHATCHIE...STAFFORD...GILMANIA...GRAYS...
KRESS...

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.
BE READY TO TAKE IMMEDIATE ACTION IN CASE A SEVERE THUNDERSTORM
WARNING IS ISSUED FOR YOUR LOCATION.

&&

LAT...LON 3283 8116 3275 8086 3272 8084 3271 8083
      3270 8083 3266 8087 3264 8086 3250 8090
      3252 8119
TIME...MOT...LOC 1826Z 198DEG 11KT 3260 8099

Special weather statement, Jul 31, 2:47 PM EDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
247 PM EDT WED JUL 31 2013

GAZ099>101-114>116-SCZ047-311915-
BULLOCH-CANDLER-EFFINGHAM-EVANS-INLAND BRYAN-INLAND JASPER-TATTNALL-
247 PM EDT WED JUL 31 2013

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF TATTNALL...EVANS...
BULLOCH...CANDLER...EFFINGHAM...BRYAN AND JASPER COUNTIES THROUGH 315
PM EDT...

AT 246 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
STRONG THUNDERSTORMS...ALONG A LINE EXTENDING FROM METTER MUNICIPLE
AIRPORT TO PURYSBURGH...MOVING NORTH AT 15 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
GUYTON...EMIT...REGISTER...METTER...STILLWELL...CANOE POND...
TUSCULUM...SOMERSET...LEEFIELD...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
GUSTY WINDS OF 40 TO 50 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
TORRENTIAL RAIN WHICH MAY PRODUCE LOCALIZED FLOODING...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT LIGHTNING IS OCCURRING WITH THIS THUNDERSTORM. IF
OUTDOORS...STAY AWAY FROM ISOLATED TALL OBJECTS. IF INDOORS...STAY
AWAY FROM WINDOWS AND DOORS. AVOID USING PLUMBING AND ELECTRICAL
APPLIANCES UNLESS IT IS AN EMERGENCY.

THIS THUNDERSTORM IS CAPABLE OF PRODUCING VERY HEAVY RAIN...WHICH MAY
FLOOD DITCHES AND LOW-LYING AREAS. REDUCE VEHICLE SPEED TO LOWER THE
RISK OF HYDROPLANING. DO NOT DRIVE INTO PLACES WHERE WATER COVERS THE
ROAD. SEEK AN ALTERNATE ROUTE.

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.
BE READY TO TAKE IMMEDIATE ACTION IN CASE A SEVERE THUNDERSTORM
WARNING IS ISSUED FOR YOUR LOCATION.

&&

LAT...LON 3255 8209 3253 8163 3249 8155 3253 8151
      3250 8094 3226 8105 3214 8178 3216 8218
      3228 8223 3231 8223
TIME...MOT...LOC 1848Z 194DEG 12KT 3236 8205 3233 8112

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 10:37 AM EDT	Special Marine Warning	CHS		113 min
Jul 31, 2:05 PM EDT	Special Weather Statement	CHS	Charleston	40 min
Jul 31, 2:12 PM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston	2 hr
Jul 31, 2:21 PM EDT	Special Marine Warning	CHS		114 min
Jul 31, 2:26 PM EDT	Special Weather Statement	CHS	Hampton	34 min
Jul 31, 2:47 PM EDT	Special Weather Statement	CHS	Jasper	28 min
Jul 31, 3:10 PM EDT	Special Weather Statement	CHS	Dorchester	50 min
Jul 31, 3:15 PM EDT	Special Weather Statement	CHS	Jasper	45 min
Jul 31, 3:51 PM EDT	Areal Flood Advisory	CHS	Jasper	84 min
Jul 31, 3:59 PM EDT	Special Weather Statement	CHS	Beaufort, Jasper	46 min
Jul 31, 4:14 PM EDT	Areal Flood Advisory	CHS	Colleton, Dorchester	91 min
Jul 31, 4:18 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Jasper	57 min
Jul 31, 4:53 PM EDT	Areal Flood Advisory	CHS	Beaufort, Jasper	112 min
Jul 31, 5:44 PM EDT	Flash Flood Warning	CHS	Beaufort, Jasper	61 min
Jul 31, 5:55 PM EDT	Flash Flood Warning	CHS	Beaufort, Jasper	65 min
Jul 31, 6:44 PM EDT	Flash Flood Warning	CHS	Beaufort, Jasper	61 min
Jul 31, 7:36 PM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston, Colleton, Dorchester	84 min
Jul 31, 3:23 PM EDT	Special Weather Statement	CHS	Liberty, McIntosh	52 min
Jul 31, 3:43 PM EDT	Areal Flood Advisory	CHS	Liberty, Long, McIntosh	2 hr
Jul 31, 3:57 PM EDT	Special Weather Statement	CHS	Chatham	48 min
Jul 31, 7:17 PM EDT	Areal Flood Advisory	CHS	Screven	88 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2013 Every severe thunderstorm warning in 2013

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.