Alert archive / South Carolina / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 90, NWS Wilmington, NC

August 18, 2024Florence County, Horry County, Marion County, South Carolina

NWS Wilmington, NC issued this severe thunderstorm warning at Aug 18, 2024, 6:49 PM EDT for Florence County, Horry County, Marion County, South Carolina. It was in force for 41 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 18, 2024, 6:49 PM EDT (22:49 UTC)
Expired: Aug 18, 2024, 7:30 PM EDT
In force: 41 min
Issued by: NWS Wilmington, NC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Florence County, SC, Horry County, SC, Marion County, SC

The radar

The Wilmington radar (KLTX), 85 km from the middle of the area, began a volume at 22:52 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, 10.8 hours before the alert went out and 137 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: 253 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1057 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 108 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 Wilmington, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 3:04 PM EDT, 3 hours 45 minutes earlier.

Area forecast discussion, Aug 18, 3:04 PM EDT, 3 hours 45 minutes before

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Hazardous weather outlook, Aug 18, 3:36 PM EDT, 3 hours 13 minutes before

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In the hours before

Local storm report, Aug 18, 4:28 PM EDT, 2 hours 21 minutes before

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Local storm report, Aug 18, 4:29 PM EDT, 2 hours 20 minutes before

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Local storm report, Aug 18, 4:35 PM EDT, 2 hours 14 minutes before

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Special weather statement, Aug 18, 6:25 PM EDT, 24 minutes before

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Special weather statement, Aug 18, 6:47 PM 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
Aug 17, 8:00 PM EDT	Rip Current Statement	ILM	Brunswick, New Hanover, Pender	24 hr
Aug 18, 2:39 AM EDT	Coastal Flood Advisory	ILM	New Hanover	8 hr
Aug 18, 2:35 PM EDT	Coastal Flood Advisory	ILM	Brunswick, New Hanover	9 hr
Aug 18, 6:47 PM EDT	Special Weather Statement	ILM	Bladen	58 min
Aug 18, 7:16 PM EDT	Special Weather Statement	ILM	Robeson	44 min
Aug 18, 7:45 PM EDT	Special Weather Statement	ILM	Bladen	45 min
Aug 18, 6:25 PM EDT	Special Weather Statement	ILM	Florence	65 min
Aug 18, 7:30 PM EDT	Special Weather Statement	ILM	Horry	60 min
Aug 18, 7:39 PM EDT	Special Weather Statement	ILM	Marion	51 min
Aug 18, 7:54 PM EDT	Severe Thunderstorm Warning	ILM	Horry, Marion	36 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2024 Every severe thunderstorm warning in 2024

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.