Alert archive / South Carolina / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 269, NWS Charleston, SC
NWS Charleston, SC issued this severe thunderstorm warning at Aug 12, 2009, 1:13 PM EDT for 7 counties in 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 12, 2009, 1:13 PM EDT (17:13 UTC)
- Expired
- Aug 12, 2009, 2:15 PM EDT
- In force
- 62 min
- Issued by
- NWS Charleston, SC
- Area
- Storm-based polygon
Counties Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC
The radar
The Charleston,SC radar (KCLX), 49 km from the middle of the area, began a volume at 17:13 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 |
|---|---|---|---|
| Aug 12, 12:23 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 12:00Z, 5.2 hours before the alert went out and 53 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
- 2560 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 985 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
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 12, 11:35 AM EDT, 1 hour 38 minutes earlier.
Area forecast discussion, Aug 12, 11:35 AM EDT, 1 hour 38 minutes before
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</html>Hazardous weather outlook, Aug 12, 12:30 PM EDT, 43 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE CHARLESTON SC 1230 PM EDT WED AUG 12 2009 AMZ330-GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>051- 131000- CHARLESTON HARBOR-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- 1230 PM EDT WED AUG 12 2009 ...SEVERE THUNDERSTORM WATCH 700 IN EFFECT UNTIL 9 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS...SOUTHEAST GEORGIA AND SOUTHEAST SOUTH CAROLINA. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION IS REQUESTED THROUGH THIS EVENING. AMZ350-352-354-374-131000- 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- 1230 PM EDT WED AUG 12 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT. SEVERE THUNDERSTORMS...SCATTERED THUNDERSTORMS WILL IMPACT THE COASTAL WATERS LATE THIS AFTERNOON INTO THIS EVENING. SOME OF THESE STORMS COULD BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS. LOCALLY HEAVY RAINFALL AS WELL AS CLOUD TO WATER LIGHTNING WILL ALSO OCCUR. THE RISK FOR SEVERE THUNDERSTORMS WILL PERSIST INTO THE EVENING HOURS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER GROUPS AND EMERGENCY MANAGEMENT OFFICIALS SHOULD BE PREPARED FOR POSSIBLE ACTIVATION THROUGH THIS EVENING. JAQ
In the hours before
Special weather statement, Aug 12, 12:00 PM EDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 1200 PM EDT WED AUG 12 2009 SCZ042-043-121630- HAMPTON-INLAND COLLETON- 1200 PM EDT WED AUG 12 2009 ...STRONG THUNDERSTORMS WILL IMPACT NORTHWESTERN COLLETON AND NORTH CENTRAL HAMPTON COUNTIES THROUGH 1230 PM EDT... AT 1159 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 MILEY...OR ABOUT 8 MILES NORTHEAST OF HAMPTON...MOVING NORTHEAST AT 20 MPH. AREAS IN AND AROUND MOSELLE...MILEY...ASHTON...LODGE...CALDWELL... COLLETON...PADGETTS...WILLIAMS...WILL BE IMPACTED THROUGH 1230 PM 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 12, 12:31 PM EDT, 42 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 1231 PM EDT WED AUG 12 2009 GAZ088-SCZ040-042-121715- ALLENDALE-HAMPTON-SCREVEN- 1231 PM EDT WED AUG 12 2009 ...STRONG THUNDERSTORMS WILL IMPACT WEST CENTRAL HAMPTON...SOUTH CENTRAL ALLENDALE AND SCREVEN COUNTIES THROUGH 115 PM EDT... AT 1230 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING 1/2 INCH HAIL...AND STRONG WINDS OF 45 TO 55 MPH. THIS STORM WAS LOCATED NEAR FARMDALE...OR ABOUT OVER SYLVANIA...MOVING NORTHEAST AT 20 MPH. AREAS IN AND AROUND FARMDALE...CAPTOLO...GREEN HILL...WHITE HILL...AND ALLENDALE WILL BE IMPACTED THROUGH 115 PM EDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT LIGHTNING IS EXPECTED. 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. A SEVERE THUNDERSTORM WATCH IS ALSO IN EFFECT. THUNDERSTORMS CAN PRODUCE LARGE HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES SUDDENLY...SOMETIMES WITH LITTLE OR NO WARNING. BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND BE READY TO ACT QUICKLY IF SEVERE WEATHER IS OBSERVED OR A WARNING IS ISSUED. 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. &&
The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 2:09 PM EDT | Severe Thunderstorm Warning | CHS | Chatham, Effingham | 66 min |
| Aug 12, 2:15 PM EDT | Severe Thunderstorm Warning | CHS | Jenkins, Screven | 60 min |
| Aug 12, 2:58 PM EDT | Special Marine Warning | CHS | 62 min | |
| Aug 12, 3:16 PM EDT | Severe Thunderstorm Warning | CHS | Bulloch, Jenkins, Screven | 59 min |
| Aug 12, 3:54 PM EDT | Special Marine Warning | CHS | 66 min | |
| Aug 12, 4:21 PM EDT | Severe Thunderstorm Warning | CHS | Bryan, Chatham | 54 min |
| Aug 12, 4:23 PM EDT | Special Marine Warning | CHS | 67 min | |
| Aug 12, 4:30 PM EDT | Severe Thunderstorm Warning | CHS | Bulloch, Effingham | 60 min |
| Aug 12, 5:07 PM EDT | Areal Flood Advisory | CHS | Chatham | 113 min |
| Aug 12, 5:11 PM EDT | Severe Thunderstorm Warning | CHS | Bryan, Chatham, Effingham | 48 min |
| Aug 12, 5:23 PM EDT | Special Marine Warning | CHS | 67 min | |
| Aug 12, 6:17 PM EDT | Areal Flood Advisory | CHS | Chatham | 118 min |
| Aug 12, 6:23 PM EDT | Special Marine Warning | CHS | 67 min | |
| Aug 12, 6:30 PM EDT | Flash Flood Warning | CHS | Chatham | 64 min |
| Aug 12, 7:00 PM EDT | Areal Flood Advisory | CHS | McIntosh | 2 hr |
| Aug 12, 7:10 PM EDT | Special Marine Warning | CHS | 65 min | |
| Aug 12, 7:23 PM EDT | Special Marine Warning | CHS | 82 min | |
| Aug 12, 12:17 PM EDT | Severe Thunderstorm Warning | CHS | Colleton, Dorchester | 58 min |
| Aug 12, 12:59 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Dorchester | 61 min |
| Aug 12, 1:56 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston, Dorchester | 64 min |
| Aug 12, 2:32 PM EDT | Areal Flood Advisory | CHS | Berkeley, Charleston, Dorchester | 84 min |
| Aug 12, 2:49 PM EDT | Severe Thunderstorm Warning | CHS | Beaufort, Colleton, Jasper | 56 min |
| Aug 12, 4:12 PM EDT | Areal Flood Advisory | CHS | Beaufort | 93 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.