Alert archive / Georgia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 91, NWS Charleston, SC

July 11, 2010Jenkins County, Screven County, Georgia; Allendale County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jul 11, 2010, 2:37 PM EDT for Jenkins County, Screven County, Georgia; Allendale County, South Carolina. It was in force for 53 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 11, 2010, 2:37 PM EDT (18:37 UTC)
Expired
Jul 11, 2010, 3:30 PM EDT
In force
53 min
Issued by
NWS Charleston, SC
Area
Storm-based polygon

Counties Jenkins County, GA, Screven County, GA, Allendale County, SC

The radar

The Charleston,SC radar (KCLX), 60 km from the middle of the area, began a volume at 18:37 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.

IssuedProductOfficeLasted
Jul 11, 2:00 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 6.6 hours before the alert went out and 154 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2010-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1679 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2010-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1679 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
606 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

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 11, 1:12 PM EDT, 1 hour 25 minutes earlier.

Area forecast discussion, Jul 11, 1:12 PM EDT, 1 hour 25 minutes before
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Hazardous weather outlook, Jul 11, 2:07 PM EDT, 30 minutes before
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In the hours before

Local storm report, Jul 11, 9:44 AM EDT, 4 hours 53 minutes before
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Local storm report, Jul 11, 9:47 AM EDT, 4 hours 50 minutes before
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Local storm report, Jul 11, 11:35 AM EDT, 3 hours 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1135 AM EDT SUN JUL 11 2010

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

0625 PM     TSTM WND DMG     SAVANNAH                32.05N 81.08W
07/10/2010                   CHATHAM            GA   LAW ENFORCEMENT

            TREE DOWN AT THE INTERSECTION OF EAST 31ST STREET AND
            CEDAR STREET.

&&

RPA
Local storm report, Jul 11, 11:36 AM EDT, 3 hours 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1136 AM EDT SUN JUL 11 2010

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

0623 PM     TSTM WND DMG     SAVANNAH                32.05N 81.08W
07/10/2010                   CHATHAM            GA   LAW ENFORCEMENT

            TREE DOWN AT THE INTERSECTION OF WEST 47TH STREET AND
            STEVENS STREET.

&&

RPA
Local storm report, Jul 11, 11:39 AM EDT, 2 hours 58 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1139 AM EDT SUN JUL 11 2010

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

0705 PM     TSTM WND DMG     1 W GARDEN CITY         32.10N 81.20W
07/10/2010                   CHATHAM            GA   LAW ENFORCEMENT

            TREE DOWN NEAR THE INTERSECTION OF OLD LOUISVILLE ROAD
            AND DEAN FOREST ROAD.

&&

RPA
Special weather statement, Jul 11, 2:26 PM EDT, 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
226 PM EDT SUN JUL 11 2010

GAZ087-088-100-SCZ040-111930-
ALLENDALE-BULLOCH-JENKINS-SCREVEN-
226 PM EDT SUN JUL 11 2010

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BULLOCH...JENKINS...
SCREVEN AND ALLENDALE COUNTIES THROUGH 330 PM EDT...

AT 224 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM...NEAR PERKINS...MOVING SOUTHEAST AT 20 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
ALTMAN...HILLTONIA...MILLEN...MILLHAVEN...PERKINS...ROCKY FORD...
SCARBORO...SYLVANIA AND WOODCLIFF...

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

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.

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.

&&

LAT...LON 3292 8205 3292 8195 3295 8187 3295 8184
      3291 8176 3301 8161 3292 8135 3257 8178
      3289 8208
TIME...MOT...LOC 1826Z 310DEG 15KT 3293 8188

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 9:07 PM EDTSpecial Weather StatementCHSEvans38 min
Jul 10, 9:53 PM EDTSpecial Weather StatementCHSEffingham52 min
Jul 11, 3:32 AM EDTHeat AdvisoryCHSBulloch, Candler, Effingham, Evans, Jenkins, Long and 2 more14 hr
Jul 11, 2:26 PM EDTSpecial Weather StatementCHSJenkins, Screven64 min
Jul 11, 2:51 PM EDTSpecial Weather StatementCHSScreven39 min
Jul 11, 3:29 PM EDTCoastal Flood AdvisoryCHS6 hr
Jul 11, 3:37 PM EDTSpecial Weather StatementCHSBulloch, Effingham38 min
Jul 11, 4:08 PM EDTSevere Thunderstorm WarningCHSBryan, Bulloch, Effingham52 min
Jul 11, 4:11 PM EDTAreal Flood AdvisoryCHSBryan, Bulloch, Effingham79 min
Jul 11, 4:25 PM EDTSevere Thunderstorm WarningCHSBryan, Chatham, Effingham65 min
Jul 11, 4:27 PM EDTSpecial Marine WarningCHS2 hr
Jul 11, 4:58 PM EDTSpecial Weather StatementCHSMcIntosh32 min
Jul 11, 5:00 PM EDTSevere Thunderstorm WarningCHSMcIntosh60 min
Jul 11, 5:02 PM EDTSevere Thunderstorm WarningCHSBryan, Chatham, Liberty, McIntosh58 min
Jul 11, 5:15 PM EDTSpecial Weather StatementCHSEffingham60 min
Jul 11, 5:27 PM EDTSevere Thunderstorm WarningCHSBryan, Chatham40 min
Jul 11, 5:35 PM EDTSevere Thunderstorm WarningCHSChatham, Effingham55 min
Jul 11, 5:50 PM EDTSevere Thunderstorm WarningCHSLiberty, Long, McIntosh55 min
Jul 11, 6:28 PM EDTSpecial Marine WarningCHS50 min
Jul 10, 8:01 PM EDTSevere Thunderstorm WarningCHSBerkeley59 min
Jul 10, 11:30 PM EDTAreal Flood AdvisoryCHSBerkeley, Charleston, Colleton, Dorchester90 min
Jul 11, 1:05 AM EDTAreal Flood AdvisoryCHSBerkeley, Charleston, Dorchester3 hr

Nearby

Severe Thunderstorm Warnings in Georgia, 2010Severe Thunderstorm Warnings in South Carolina, 2010Every 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.