Alert archive / South Carolina / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 35, NWS Wilmington, NC

July 20, 2023Brunswick County, North Carolina; Horry County, Marion County, South Carolina

NWS Wilmington, NC issued this severe thunderstorm warning at Jul 20, 2023, 8:14 PM EDT for Brunswick County, North Carolina; Horry County, Marion County, South Carolina. It was in force for 61 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: Jul 20, 2023, 8:14 PM EDT (00:14 UTC)
Expired: Jul 20, 2023, 9:15 PM EDT
In force: 61 min
Issued by: NWS Wilmington, NC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Brunswick County, NC, Horry County, SC, Marion County, SC

The radar

The Wilmington radar (KLTX), 39 km from the middle of the area, began a volume at 00:14 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, 0.2 hours before the alert went out and 163 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: 2953 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1155 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 13.3

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 Jul 20, 7:40 PM EDT, 34 minutes earlier.

Area forecast discussion, Jul 20, 7:40 PM EDT, 34 minutes before

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Hazardous weather outlook, Jul 20, 3:41 PM EDT, 4 hours 33 minutes before

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In the hours before

Special weather statement, Jul 20, 4:55 PM EDT, 3 hours 19 minutes before

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Special weather statement, Jul 20, 6:20 PM EDT, 1 hour 54 minutes before

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Special weather statement, Jul 20, 6:43 PM EDT, 1 hour 31 minutes before

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Special weather statement, Jul 20, 7:16 PM EDT, 58 minutes before

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Special weather statement, Jul 20, 7:51 PM EDT, 23 minutes before

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Special weather statement, Jul 20, 8:00 PM EDT, 14 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
Jul 20, 8:29 PM EDT	Special Weather Statement	ILM	Columbus	61 min
Jul 20, 8:32 PM EDT	Special Marine Warning	ILM		58 min
Jul 20, 8:47 PM EDT	Special Marine Warning	ILM		58 min
Jul 20, 9:28 PM EDT	Special Marine Warning	ILM		92 min
Jul 20, 9:42 PM EDT	Special Marine Warning	ILM		93 min
Jul 20, 11:14 PM EDT	Special Marine Warning	ILM		74 min
Jul 21, 2:49 PM EDT	Coastal Flood Advisory	ILM	New Hanover	12 hr
Jul 20, 8:00 PM EDT	Special Weather Statement	ILM	Williamsburg	60 min
Jul 20, 8:57 PM EDT	Severe Thunderstorm Warning	ILM	Georgetown, Horry, Williamsburg	63 min
Jul 20, 9:47 PM EDT	Severe Thunderstorm Warning	ILM	Georgetown, Williamsburg	58 min
Jul 20, 10:45 PM EDT	Special Weather Statement	ILM	Georgetown	60 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2023 Severe Thunderstorm Warnings in North 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.