Alert archive / South Carolina / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 73, NWS Charleston, SC

August 7, 20234 counties in South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Aug 7, 2023, 8:42 PM EDT for 4 counties in South Carolina. It was in force for 63 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 7, 2023, 8:42 PM EDT (00:42 UTC)
Expired: Aug 7, 2023, 9:45 PM EDT
In force: 63 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Beaufort County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC

The radar

The Charleston,SC radar (KCLX), 59 km from the middle of the area, began a volume at 00:44 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
Aug 7, 7:42 PM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 0.7 hours before the alert went out and 43 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: 2787 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1141 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 10.0

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 7, 8:14 PM EDT, 28 minutes earlier.

Area forecast discussion, Aug 7, 8:14 PM EDT, 28 minutes before

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Hazardous weather outlook, Aug 7, 7:56 PM EDT, 46 minutes before

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In the hours before

Local storm report, Aug 7, 8:22 PM EDT, 20 minutes before

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Local storm report, Aug 7, 8:30 PM EDT, 12 minutes before

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Local storm report, Aug 7, 8:32 PM EDT, 10 minutes before

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Local storm report, Aug 7, 8:33 PM EDT, 9 minutes before

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Local storm report, Aug 7, 8:35 PM EDT, 7 minutes before

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Local storm report, Aug 7, 8:38 PM EDT, 4 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 7, 8:10 PM EDT	Severe Thunderstorm Warning	CHS	Allendale, Hampton, Jasper	65 min
Aug 7, 8:47 PM EDT	Special Weather Statement	CHS	Berkeley	28 min
Aug 7, 8:49 PM EDT	Special Marine Warning	CHS		116 min
Aug 7, 9:38 PM EDT	Special Marine Warning	CHS		114 min
Aug 7, 9:43 PM EDT	Special Weather Statement	CHS	Beaufort	32 min
Aug 7, 9:56 PM EDT	Severe Thunderstorm Warning	CHS	Charleston, Colleton	33 min
Aug 7, 10:42 PM EDT	Special Marine Warning	CHS		77 min
Aug 8, 3:06 AM EDT	Heat Advisory	CHS	Berkeley, Colleton, Dorchester, Hampton	17 hr
Aug 8, 7:26 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Jasper	64 min
Aug 8, 7:36 PM EDT	Severe Thunderstorm Warning Considerable damage threat	CHS	Hampton, Jasper	54 min
Aug 8, 7:45 PM EDT	Special Marine Warning	CHS		2 hr
Aug 8, 3:06 AM EDT	Excessive Heat Warning	CHS	Long	17 hr
Aug 8, 4:20 PM EDT	Special Weather Statement	CHS	Chatham	40 min
Aug 8, 4:21 PM EDT	Special Weather Statement	CHS	Liberty	39 min
Aug 8, 6:19 PM EDT	Severe Thunderstorm Warning	CHS	Evans, Long, Tattnall	56 min
Aug 8, 6:21 PM EDT	Severe Thunderstorm Warning	CHS	Bulloch, Candler, Evans, Tattnall	54 min
Aug 8, 6:54 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Bulloch, Effingham, Evans, Liberty, Long and 1 more	66 min
Aug 8, 7:05 PM EDT	Severe Thunderstorm Warning	CHS	Bulloch, Candler, Evans, Long, Tattnall	55 min
Aug 8, 7:23 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Chatham, Liberty, Long, McIntosh	67 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2023 Every severe thunderstorm warning in 2023

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.