Alert archive / South Carolina / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 222, NWS Charleston, SC

July 27, 2009Beaufort County, Colleton County, Jasper County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jul 27, 2009, 2:26 PM EDT for Beaufort County, Colleton County, Jasper County, South Carolina. It was in force for 64 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 27, 2009, 2:26 PM EDT (18:26 UTC)
Expired: Jul 27, 2009, 3:30 PM EDT
In force: 64 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

Counties Beaufort County, SC, Colleton County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 27 km from the middle of the area, began a volume at 18:26 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, 6.4 hours before the alert went out and 84 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: 1073 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1130 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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 27, 1:47 PM EDT, 39 minutes earlier.

Area forecast discussion, Jul 27, 1:47 PM EDT, 39 minutes before

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Hazardous weather outlook, Jul 27, 3:38 AM EDT, 10 hours 48 minutes before

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In the hours before

Special weather statement, Jul 27, 2:15 PM EDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 9:36 PM EDT	Small Craft Advisory	CHS		6 hr
Jul 27, 4:25 PM EDT	Severe Thunderstorm Warning	CHS	Bulloch, Effingham, Screven	65 min
Jul 27, 4:28 PM EDT	Severe Thunderstorm Warning	CHS	Liberty, Long, Tattnall	42 min
Jul 27, 4:45 PM EDT	Severe Thunderstorm Warning	CHS	Effingham	60 min
Jul 27, 5:14 PM EDT	Severe Thunderstorm Warning	CHS	Screven	36 min
Jul 27, 6:04 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Chatham, Effingham, Liberty	56 min
Jul 27, 6:27 PM EDT	Areal Flood Advisory	CHS	Chatham	2 hr
Jul 27, 6:48 PM EDT	Special Marine Warning	CHS		117 min
Jul 27, 7:00 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Chatham, Effingham, Liberty	43 min
Jul 27, 7:20 PM EDT	Flash Flood Warning	CHS	Chatham	87 min
Jul 27, 3:12 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Jasper	33 min
Jul 27, 3:44 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Jasper	61 min
Jul 27, 3:48 PM EDT	Severe Thunderstorm Warning	CHS	Allendale, Colleton, Hampton	57 min
Jul 27, 4:39 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Jasper	66 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2009 Every 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.