Alert archive / South Carolina / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 35, NWS Columbia, SC

May 5, 2009Chesterfield County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at May 5, 2009, 7:54 AM EDT for Chesterfield County, South Carolina. It was in force for 21 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: May 5, 2009, 7:54 AM EDT (11:54 UTC)
Expired: May 5, 2009, 8:15 AM EDT
In force: 21 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

County Chesterfield County, SC

The radar

The Columbia radar (KCAE), 117 km from the middle of the area, began a volume at 11:56 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 00:00Z, 11.9 hours before the alert went out and 194 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: 897 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.9

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 Columbia, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at May 5, 7:25 AM EDT, 29 minutes earlier.

Area forecast discussion, May 5, 7:25 AM EDT, 29 minutes before

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Hazardous weather outlook, May 5, 4:47 AM EDT, 3 hours 7 minutes before

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In the hours before

Special weather statement, May 5, 2:10 AM EDT, 5 hours 44 minutes before

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Special weather statement, May 5, 2:52 AM EDT, 5 hours 2 minutes before

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Special weather statement, May 5, 5:32 AM EDT, 2 hours 22 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 2:18 AM EDT	Severe Thunderstorm Warning	CAE	Clarendon	27 min
May 5, 10:10 AM EDT	Areal Flood Advisory	CAE	Bamberg, Barnwell, Orangeburg	110 min
May 5, 12:21 PM EDT	Areal Flood Advisory	CAE	Calhoun, Orangeburg	87 min
May 5, 9:53 AM EDT	Areal Flood Advisory	CAE	Burke	112 min
May 5, 11:25 AM EDT	Flash Flood Warning	CAE	Burke	110 min
May 5, 6:28 PM EDT	Severe Thunderstorm Warning	CAE	Columbia, McDuffie	62 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.