Alert archive / South Carolina / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 72, NWS Wilmington, NC

September 30, 2010Georgetown County, Horry County, Marion County, South Carolina

NWS Wilmington, NC issued this severe thunderstorm warning at Sep 30, 2010, 2:00 AM EDT for Georgetown County, Horry County, Marion County, South Carolina. It was in force for 30 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: Sep 30, 2010, 2:00 AM EDT (06:00 UTC)
Expired: Sep 30, 2010, 2:30 AM EDT
In force: 30 min
Issued by: NWS Wilmington, NC
Area: Storm-based polygon

Counties Georgetown County, SC, Horry County, SC, Marion County, SC

The radar

The Wilmington radar (KLTX), 75 km from the middle of the area, began a volume at 06:00 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
Sep 29, 9:39 PM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Newport, NC (KMHX), launched 00:00Z, 6.0 hours before the alert went out and 240 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: 1012 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 440 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 358 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 11.7

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 Wilmington, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 30, 1:24 AM EDT, 36 minutes earlier.

Area forecast discussion, Sep 30, 1:24 AM EDT, 36 minutes before

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Hazardous weather outlook, Sep 29, 9:45 PM EDT, 4 hours 15 minutes before

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In the hours before

Local storm report, Sep 30, 12:47 AM EDT, 1 hour 13 minutes before

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Local storm report, Sep 30, 1:04 AM EDT, 56 minutes before

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Local storm report, Sep 30, 1:56 AM EDT, 4 minutes before

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Special weather statement, Sep 30, 1:56 AM EDT, 4 minutes before

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Special weather statement, Sep 30, 1:56 AM EDT, 4 minutes before

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Local storm report, Sep 30, 1:58 AM EDT, 2 minutes before

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The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 29, 11:01 PM EDT	Areal Flood Warning	ILM	Georgetown, Horry	3 hr
Sep 29, 11:06 PM EDT	Areal Flood Advisory	ILM	Dillon, Florence, Georgetown, Horry, Marion, Williamsburg	6 hr
Sep 30, 12:25 AM EDT	Areal Flood Warning	ILM	Dillon, Florence, Georgetown, Horry, Marion, Williamsburg	6 hr
Sep 30, 1:56 AM EDT	Special Weather Statement	ILM	Georgetown	19 min
Sep 30, 2:24 AM EDT	Severe Thunderstorm Warning	ILM	Florence, Georgetown, Marion, Williamsburg	51 min
Sep 30, 3:24 AM EDT	Special Weather Statement	ILM	Horry	66 min
Sep 30, 4:43 AM EDT	Coastal Flood Warning	ILM		12 hr
Sep 30, 6:39 AM EDT	Special Marine Warning	ILM		36 min
Sep 30, 8:25 AM EDT	River Flood Warning	ILM	Darlington, Florence	14 hr
Sep 30, 11:24 AM EDT	Small Craft Advisory	ILM		3 days
Sep 29, 10:09 PM EDT	Flash Flood Warning	ILM	Bladen, Brunswick, Columbus, New Hanover, Pender	13 hr
Sep 30, 4:28 AM EDT	Special Weather Statement	ILM	Brunswick	62 min
Sep 30, 5:28 AM EDT	Special Weather Statement	ILM	Brunswick, Columbus	62 min
Sep 30, 6:29 AM EDT	Special Weather Statement	ILM	Brunswick, New Hanover	61 min
Sep 30, 6:51 AM EDT	Severe Thunderstorm Warning	ILM	Brunswick, Columbus	39 min
Sep 30, 7:21 AM EDT	River Flood Warning	ILM	Robeson	10 days
Sep 30, 7:27 AM EDT	Special Weather Statement	ILM	Pender	63 min
Sep 30, 12:07 PM EDT	Flash Flood Warning	ILM	Brunswick, New Hanover, Pender	4 hr
Sep 30, 2:48 PM EDT	Areal Flood Advisory	ILM	Bladen, Brunswick, Columbus, Pender	3 hr
Sep 30, 3:10 PM EDT	Coastal Flood Advisory	ILM		26 hr
Sep 30, 3:45 PM EDT	Flash Flood Warning	ILM	Brunswick, New Hanover, Pender	2 hr
Sep 30, 5:45 PM EDT	Flash Flood Warning	ILM	Pender	96 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2010 Every 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.