Alert archive / South Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 51, NWS Charleston, SC

April 26, 2011Allendale County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Apr 26, 2011, 3:06 PM EDT for Allendale County, South Carolina. It was in force for 28 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: Apr 26, 2011, 3:06 PM EDT (19:06 UTC)
Expired: Apr 26, 2011, 3:34 PM EDT
In force: 28 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

County Allendale County, SC

The radar

The Charleston,SC radar (KCLX), 47 km from the middle of the area, began a volume at 19:09 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, 7.1 hours before the alert went out and 127 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: 2281 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 591 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 32 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 Charleston, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 26, 1:51 PM EDT, 1 hour 15 minutes earlier.

Area forecast discussion, Apr 26, 1:51 PM EDT, 1 hour 15 minutes before

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Hazardous weather outlook, Apr 26, 4:39 AM EDT, 10 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHARLESTON SC
439 AM EDT TUE APR 26 2011

GAZ117-119-139-141-SCZ048>051-270900-
COASTAL BRYAN-COASTAL CHATHAM-COASTAL LIBERTY-COASTAL MCINTOSH-
BEAUFORT-COASTAL COLLETON-CHARLESTON-COASTAL JASPER-
439 AM EDT TUE APR 26 2011

...MODERATE RISK FOR RIP CURRENTS IN EFFECT THROUGH THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST GEORGIA AND
SOUTHEAST 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.

   MODERATE RISK FOR RIP CURRENTS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

SEVERE THUNDERSTORMS...A STRONG COLD FRONT WILL APPROACH FROM THE
WEST LATE WEDNESDAY NIGHT AND MOVE THROUGH THE AREA THURSDAY. JUST
AHEAD OF THE FRONT...THERE IS A SLIGHT RISK OF SEVERE
THUNDERSTORMS FOR ALL OF SOUTHEAST SOUTH CAROLINA AND SOUTHEAST
GEORGIA. TIMING FOR ANY SEVERE THUNDERSTORMS WILL BE AROUND DAYBREAK
THURSDAY MORNING. THE MAIN HAZARDS WITH THESE STORMS WILL BE
DAMAGING WINDS AND LARGE HAIL.

THIS IS A POTENTIALLY DANGEROUS SITUATION. STAY TUNED TO NOAA
WEATHER RADIO ALL HAZARDS...TV OR YOUR LOCAL NEWS SOURCE FOR THE
LATEST WEATHER INFORMATION FROM THE NATIONAL WEATHER SERVICE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

AMZ330-350-352-354-374-GAZ087-088-099>101-114>116-118-137-138-140-
SCZ040-042>044-047-052-270900-
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-JENKINS-SCREVEN-CANDLER-BULLOCH-EFFINGHAM-TATTNALL-EVANS-
INLAND BRYAN-INLAND CHATHAM-LONG-INLAND LIBERTY-INLAND MCINTOSH-
ALLENDALE-HAMPTON-INLAND COLLETON-DORCHESTER-INLAND JASPER-
TIDAL BERKELEY-
439 AM EDT TUE APR 26 2011

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

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

SEVERE THUNDERSTORMS...A STRONG COLD FRONT WILL APPROACH FROM THE
WEST LATE WEDNESDAY NIGHT AND MOVE THROUGH THE AREA THURSDAY. JUST
AHEAD OF THE FRONT...THERE IS A SLIGHT RISK OF SEVERE
THUNDERSTORMS FOR ALL OF SOUTHEAST SOUTH CAROLINA AND SOUTHEAST
GEORGIA. TIMING FOR ANY SEVERE THUNDERSTORMS WILL BE AROUND DAYBREAK
THURSDAY MORNING. THE MAIN HAZARDS WITH THESE STORMS WILL BE
DAMAGING WINDS AND LARGE HAIL.

THIS IS A POTENTIALLY DANGEROUS SITUATION. STAY TUNED TO NOAA
WEATHER RADIO ALL HAZARDS...TV OR YOUR LOCAL NEWS SOURCE FOR THE
LATEST WEATHER INFORMATION FROM THE NATIONAL WEATHER SERVICE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

SCZ045-270900-
INLAND BERKELEY-
439 AM EDT TUE APR 26 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

LAKE WINDS...STRENGTHENING WINDS AHEAD OF AN APPROACHING COLD
FRONT COULD PROMPT A LAKE WIND ADVISORY FOR LAKE MOULTRIE
WEDNESDAY INTO THURSDAY.

SEVERE THUNDERSTORMS...A STRONG COLD FRONT WILL APPROACH FROM THE
WEST LATE WEDNESDAY NIGHT AND MOVE THROUGH THE AREA THURSDAY. JUST
AHEAD OF THE FRONT...THERE IS A SLIGHT RISK OF SEVERE
THUNDERSTORMS FOR ALL OF SOUTHEAST SOUTH CAROLINA AND SOUTHEAST
GEORGIA. TIMING FOR ANY SEVERE THUNDERSTORMS WILL BE AROUND DAYBREAK
THURSDAY MORNING. THE MAIN HAZARDS WITH THESE STORMS WILL BE
DAMAGING WINDS AND LARGE HAIL.

THIS IS A POTENTIALLY DANGEROUS SITUATION. STAY TUNED TO NOAA
WEATHER RADIO ALL HAZARDS...TV OR YOUR LOCAL NEWS SOURCE FOR THE
LATEST WEATHER INFORMATION FROM THE NATIONAL WEATHER SERVICE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Apr 26, 2:18 PM EDT, 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
218 PM EDT TUE APR 26 2011

SCZ040-042-261845-
ALLENDALE-HAMPTON-
218 PM EDT TUE APR 26 2011

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF ALLENDALE AND HAMPTON
COUNTIES THROUGH 245 PM EDT...

AT 212 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM...NEAR ESTILL...MOVING NORTH AT 25 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
ESTILL...FAIRFAX...HAMPTON...VARNVILLE...ALLENDALE COUNTY AIRPORT AND
HAMPTON-VARNVILLE AIRPORT...

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

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 3301 8137 3296 8104 3273 8105 3259 8124
      3269 8138
TIME...MOT...LOC 1818Z 190DEG 24KT 3279 8129

Special weather statement, Apr 26, 2:34 PM EDT, 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
234 PM EDT TUE APR 26 2011

GAZ088-SCZ040-042-261900-
ALLENDALE-HAMPTON-SCREVEN-
234 PM EDT TUE APR 26 2011

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

AT 231 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM...NEAR NEWINGTON...MOVING NORTH AT 15 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
...

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

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 3282 8154 3282 8137 3259 8139 3255 8148
      3257 8152
TIME...MOT...LOC 1835Z 185DEG 15KT 3262 8145

Local storm report, Apr 26, 2:39 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
239 PM EDT TUE APR 26 2011

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

0110 PM     MARINE TSTM WIND 39 SSE CENTENARY        32.50N  79.10W
04/26/2011  M40 MPH          AMZ370             SC   BUOY

            PEAK GUST 35 KT FROM THE SOUTH.

&&

EVENT NUMBER CHS1100365

JRL

Special weather statement, Apr 26, 3:03 PM EDT, 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
303 PM EDT TUE APR 26 2011

SCZ040-042-261930-
ALLENDALE-HAMPTON-
303 PM EDT TUE APR 26 2011

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF ALLENDALE AND HAMPTON
COUNTIES THROUGH 330 PM EDT...

AT 300 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM...NEAR ALLENDALE...MOVING NORTH AT 15 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
ALLENDALE...FAIRFAX AND ALLENDALE COUNTY AIRPORT...

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

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 3311 8136 3311 8128 3312 8125 3312 8119
      3310 8116 3309 8116 3292 8120 3294 8141
      3313 8141
TIME...MOT...LOC 1904Z 185DEG 15KT 3302 8129

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 12:36 PM EDT	Special Marine Warning	CHS		114 min
Apr 26, 2:34 PM EDT	Special Weather Statement	CHS	Screven	26 min
Apr 26, 4:07 PM EDT	Small Craft Advisory	CHS		67 hr
Apr 26, 6:55 PM EDT	Special Weather Statement	CHS	McIntosh	35 min
Apr 26, 7:10 PM EDT	Special Weather Statement	CHS	McIntosh	35 min
Apr 26, 2:18 PM EDT	Special Weather Statement	CHS	Allendale, Hampton	27 min
Apr 26, 3:03 PM EDT	Special Weather Statement	CHS	Allendale	27 min
Apr 26, 3:30 PM EDT	Lake Wind Advisory	CHS	Berkeley	48 hr

Nearby

Severe Thunderstorm Warnings in South Carolina, 2011 Every severe thunderstorm warning in 2011

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.