Alert archive / South Carolina / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 282, NWS Charleston, SC
NWS Charleston, SC issued this severe thunderstorm warning at Aug 31, 2009, 7:43 AM EDT for Berkeley County, Charleston County, South Carolina. It was in force for 62 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
- Aug 31, 2009, 7:43 AM EDT (11:43 UTC)
- Expired
- Aug 31, 2009, 8:45 AM EDT
- In force
- 62 min
- Issued by
- NWS Charleston, SC
- Area
- Storm-based polygon
Counties Berkeley County, SC, Charleston County, SC
The radar
The Charleston,SC radar (KCLX), 108 km from the middle of the area, began a volume at 11:45 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 00:00Z, 11.7 hours before the alert went out and 10 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.
- Mixed-layer CAPE
- 2069 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 1007 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
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 Aug 31, 7:39 AM EDT, 4 minutes earlier.
Area forecast discussion, Aug 31, 7:39 AM EDT, 4 minutes before
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</html>Hazardous weather outlook, Aug 31, 4:12 AM EDT, 3 hours 31 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHARLESTON SC 412 AM EDT MON AUG 31 2009 AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040- 042>045-047>051-010900- 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-COASTAL BRYAN-INLAND CHATHAM-COASTAL CHATHAM-LONG- INLAND LIBERTY-COASTAL LIBERTY-INLAND MCINTOSH-COASTAL MCINTOSH- ALLENDALE-HAMPTON-INLAND COLLETON-DORCHESTER-BERKELEY-INLAND JASPER- BEAUFORT-COASTAL COLLETON-CHARLESTON-COASTAL JASPER- 412 AM EDT MON AUG 31 2009 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...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
In the hours before
Special weather statement, Aug 31, 2:38 AM EDT, 5 hours 5 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 238 AM EDT MON AUG 31 2009 SCZ049-050-310715- CHARLESTON-COASTAL COLLETON- 238 AM EDT MON AUG 31 2009 ...STRONG THUNDERSTORMS WILL IMPACT SOUTHWESTERN CHARLESTON AND SOUTHEASTERN COLLETON COUNTIES THROUGH 315 AM EDT... AT 237 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING 1/2 INCH HAIL...AND STRONG WINDS OF 40 TO 50 MPH. THIS STORM WAS LOCATED NEAR FENWICK...OR ABOUT 12 MILES NORTHWEST OF EDISTO BEACH...MOVING NORTHEAST AT 15 MPH. AREAS IN AND AROUND FENWICK...ADAMS RUN...HOLLYWOOD...RAVENEL...WILL BE IMPACTED THROUGH 315 AM EDT. 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. && JAQ
Special weather statement, Aug 31, 6:18 AM EDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 618 AM EDT MON AUG 31 2009 SCZ043>045-050-311045- BERKELEY-CHARLESTON-DORCHESTER-INLAND COLLETON- 618 AM EDT MON AUG 31 2009 ...STRONG THUNDERSTORMS WILL IMPACT CENTRAL CHARLESTON...NORTHEASTERN COLLETON...DORCHESTER AND WESTERN BERKELEY COUNTIES THROUGH 645 AM EDT... AT 615 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL...AND GUSTY WINDS OF 35 TO 45 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM SAINT GEORGE TO 6 MILES WEST OF SLANDS BRIDGE...MOVING EAST AT 25 MPH. AREAS IN AND AROUND TEXAS...NORMAN LANDING...SAINT GEORGE...INDIAN FIELD...GIVHANS...ROSINVILLE...SLANDS BRIDGE...DORCHESTER...COOKE CROSSROADS...WILL BE IMPACTED THROUGH 645 AM EDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED. IF TIME PERMITS...UNPLUG COMPUTERS...TELEVISION SETS...CABLE MODEMS AND OTHER HOME APPLIANCES AS THEY ARE SUSCEPTIBLE TO POWER SURGES AND MAY BE DAMAGED BY NEARBY LIGHTNING STRIKES. 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. PLEASE CONTACT THE NATIONAL WEATHER SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 IF YOU OBSERVE SEVERE WEATHER SUCH AS HAIL...DOWNED TREES...LIMBS AND POWER LINES. &&
Special weather statement, Aug 31, 6:59 AM EDT, 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 659 AM EDT MON AUG 31 2009 SCZ044-045-050-311130- BERKELEY-CHARLESTON-DORCHESTER- 659 AM EDT MON AUG 31 2009 ...STRONG THUNDERSTORMS WILL IMPACT CENTRAL CHARLESTON...SOUTHEASTERN DORCHESTER AND SOUTH CENTRAL BERKELEY COUNTIES THROUGH 730 AM EDT... AT 658 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING 1/2 INCH HAIL...AND STRONG WINDS OF 40 TO 50 MPH. THIS STORM WAS LOCATED NEAR LINCOLNVILLE...OR ABOUT OVER SUMMERVILLE...MOVING NORTHEAST AT 25 MPH. AREAS IN AND AROUND LINCOLNVILLE...STALLSVILLE...COLLEGE PARK... LADSON...DRIGGERSTOWN...OAKATEE...MOUNT HOLLY...ARARAT... STRAWBERRY...WILL BE IMPACTED THROUGH 730 AM EDT. 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. HAVE AN ACTION PLAN READY IN THE EVENT THIS STORM STRENGTHENS OR A WARNING IS ISSUED. CONTINUE TO MONITOR NOAA WEATHER RADIO ALL HAZARDS FOR THE LATEST WEATHER INFORMATION. && JAQ
Local storm report, Aug 31, 7:20 AM EDT, 23 minutes before
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</html>The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 1:21 AM EDT | Special Marine Warning | CHS | 42 min | |
| Aug 31, 8:14 AM EDT | Special Marine Warning | CHS | 41 min | |
| Aug 31, 4:56 PM EDT | Special Marine Warning | CHS | 94 min | |
| Aug 31, 5:56 PM EDT | Areal Flood Advisory | CHS | Bryan, Chatham | 94 min |
| Aug 31, 6:38 PM EDT | Special Marine Warning | CHS | 67 min | |
| Aug 31, 7:32 PM EDT | Areal Flood Advisory | CHS | Bryan, Chatham, Effingham | 58 min |
| Aug 31, 7:03 AM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston | 57 min |
| Aug 31, 9:51 AM EDT | Areal Flood Advisory | CHS | Berkeley, Charleston | 24 min |
| Aug 31, 6:10 PM EDT | Severe Thunderstorm Warning | CHS | Beaufort | 65 min |
| Aug 31, 6:27 PM EDT | Areal Flood Advisory | CHS | Beaufort, Jasper | 71 min |
Nearby
Severe Thunderstorm Warnings in South Carolina, 2009Every severe thunderstorm warning in 2009
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.