Alert archive / South Carolina / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 169, NWS Charleston, SC

June 18, 20095 counties in South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jun 18, 2009, 5:20 AM EDT for 5 counties in South Carolina. It was in force for 55 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
Jun 18, 2009, 5:20 AM EDT (09:20 UTC)
Expired
Jun 18, 2009, 6:15 AM EDT
In force
55 min
Issued by
NWS Charleston, SC
Area
Storm-based polygon

Counties Beaufort County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 47 km from the middle of the area, began a volume at 09:23 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
Jun 18, 1:39 AM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 9.3 hours before the alert went out and 56 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 00:00Z on 2009-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1334 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 00:00Z on 2009-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939Sfc1 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
1334 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
910 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.0

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 Jun 18, 4:44 AM EDT, 36 minutes earlier.

Area forecast discussion, Jun 18, 4:44 AM EDT, 36 minutes before
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Hazardous weather outlook, Jun 18, 5:09 AM EDT, 11 minutes before
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In the hours before

Local storm report, Jun 18, 3:36 AM EDT, 1 hour 44 minutes before
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Local storm report, Jun 18, 4:47 AM EDT, 33 minutes before
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Special weather statement, Jun 18, 5:09 AM EDT, 11 minutes before
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Local storm report, Jun 18, 5:17 AM EDT, 3 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 2:35 AM EDTSevere Thunderstorm WarningCHSBulloch, Jenkins, Screven55 min
Jun 18, 3:24 AM EDTSevere Thunderstorm WarningCHSBulloch, Candler, Evans, Jenkins, Tattnall66 min
Jun 18, 4:01 AM EDTSevere Thunderstorm WarningCHSBryan, Bulloch, Evans, Liberty, Long, Tattnall59 min
Jun 18, 5:16 AM EDTSevere Thunderstorm WarningCHSBryan, Chatham, Liberty44 min
Jun 18, 5:48 AM EDTSpecial Marine WarningCHS117 min
Jun 18, 6:35 AM EDTSpecial Marine WarningCHS62 min
Jun 18, 6:49 AM EDTSpecial Marine WarningCHS116 min
Jun 18, 7:45 AM EDTSpecial Marine WarningCHS74 min
Jun 18, 4:11 PM EDTHeat AdvisoryCHSBulloch, Candler, Effingham, Evans, Jenkins, Long and 2 more27 hr
Jun 18, 7:29 PM EDTSevere Thunderstorm WarningCHSBulloch, Candler, Evans, Tattnall61 min
Jun 18, 7:36 PM EDTSevere Thunderstorm WarningCHSBulloch, Candler, Jenkins, Screven69 min
Jun 18, 7:46 PM EDTSevere Thunderstorm WarningCHSScreven59 min
Jun 18, 3:29 AM EDTSevere Thunderstorm WarningCHSAllendale, Colleton, Hampton18 min
Jun 18, 6:08 AM EDTSevere Thunderstorm WarningCHSBeaufort, Berkeley, Charleston, Colleton, Dorchester67 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.