Alert archive / South Carolina / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 5, NWS Columbia, SC

March 1, 2018Clarendon County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Mar 1, 2018, 4:58 PM EST for Clarendon County, South Carolina. It was in force for 17 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: Mar 1, 2018, 4:58 PM EST (21:58 UTC)
Expired: Mar 1, 2018, 5:15 PM EST
In force: 17 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Clarendon County, SC

The radar

The Columbia radar (KCAE), 89 km from the middle of the area, began a volume at 21:57 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, 10.0 hours before the alert went out and 88 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: 33 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Columbia, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 1, 2:13 PM EST, 2 hours 45 minutes earlier.

Area forecast discussion, Mar 1, 2:13 PM EST, 2 hours 45 minutes before

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Hazardous weather outlook, Mar 1, 1:55 PM EST, 3 hours 3 minutes before

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In the hours before

Local storm report, Mar 1, 4:18 PM EST, 40 minutes before

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Local storm report, Mar 1, 4:25 PM EST, 33 minutes before

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Local storm report, Mar 1, 4:39 PM EST, 19 minutes before

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Local storm report, Mar 1, 4:40 PM EST, 18 minutes before

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Special weather statement, Mar 1, 4:45 PM EST, 13 minutes before

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Local storm report, Mar 1, 4:53 PM EST, 5 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
Mar 1, 2:22 PM EST	Special Weather Statement	CAE	McCormick	23 min
Mar 1, 2:34 PM EST	Special Weather Statement	CAE	Saluda	26 min
Mar 1, 3:06 PM EST	Special Weather Statement	CAE	Fairfield, Lexington, Richland	24 min
Mar 1, 3:09 PM EST	Special Weather Statement	CAE	Lancaster	51 min
Mar 1, 3:38 PM EST	Severe Thunderstorm Warning	CAE	Calhoun, Kershaw, Lee, Lexington, Richland, Sumter	22 min
Mar 1, 3:43 PM EST	Severe Thunderstorm Warning	CAE	Chesterfield, Fairfield, Kershaw, Lancaster, Lee	45 min
Mar 1, 3:49 PM EST	Severe Thunderstorm Warning	CAE	Aiken	30 min
Mar 1, 4:00 PM EST	Severe Thunderstorm Warning	CAE	Calhoun, Clarendon, Kershaw, Lee, Lexington, Richland and 1 more	60 min
Mar 1, 4:14 PM EST	Special Weather Statement	CAE	Bamberg, Barnwell, Orangeburg	61 min
Mar 1, 4:45 PM EST	Special Weather Statement	CAE	Clarendon	60 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2018 Every severe thunderstorm warning in 2018

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.