Alert archive / South Carolina / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 95, NWS Charleston, SC

August 20, 2014Charleston County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Aug 20, 2014, 3:33 PM EDT for Charleston County, South Carolina. It was in force for 57 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: Aug 20, 2014, 3:33 PM EDT (19:33 UTC)
Expired: Aug 20, 2014, 4:30 PM EDT
In force: 57 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

County Charleston County, SC

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 7.6 hours before the alert went out and 18 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: 207 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 980 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 15 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 Charleston, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 2:08 PM EDT, 1 hour 25 minutes earlier.

Area forecast discussion, Aug 20, 2:08 PM EDT, 1 hour 25 minutes before

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Hazardous weather outlook, Aug 20, 4:56 AM EDT, 10 hours 37 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
Aug 20, 3:11 PM EDT	Special Marine Warning	CHS		2 hr
Aug 20, 3:47 PM EDT	Heat Advisory	CHS	Allendale, Berkeley, Colleton, Dorchester, Hampton	27 hr
Aug 20, 6:40 PM EDT	Special Weather Statement	CHS	Bulloch, Candler, Evans, Jenkins, Screven, Tattnall	50 min
Aug 20, 7:28 PM EDT	Special Weather Statement	CHS	Bulloch, Candler, Evans, Jenkins, Tattnall	32 min
Aug 20, 7:39 PM EDT	Areal Flood Advisory	CHS	Bulloch, Candler, Evans	96 min
Aug 20, 7:53 PM EDT	Severe Thunderstorm Warning	CHS	Bulloch, Effingham, Screven	25 min
Aug 20, 7:59 PM EDT	Special Weather Statement	CHS	Evans, Tattnall	46 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2014 Every severe thunderstorm warning in 2014

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.