Alert archive / South Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Wilmington, NC

August 4, 2017Williamsburg County, South Carolina

NWS Wilmington, NC issued this special weather statement at Aug 4, 2017, 8:36 PM EDT for Williamsburg County, South Carolina. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 4, 2017, 8:36 PM EDT (00:36 UTC)
Expired: Aug 4, 2017, 9:30 PM EDT
In force: 54 min
Issued by: NWS Wilmington, NC

County Williamsburg County, SC

The radar

The Columbia radar (KCAE), 118 km from the middle of the area, began a volume at 00:35 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, 0.6 hours before the alert went out and 87 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: 1314 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 840 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 4, 8:26 PM EDT, 10 minutes earlier.

Area forecast discussion, Aug 4, 8:26 PM EDT, 10 minutes before

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In the hours before

Special weather statement, Aug 4, 8:36 PM EDT, 0 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 4, 9:19 PM EDT	Special Weather Statement	ILM	Florence, Marion	41 min
Aug 5, 6:23 PM EDT	Areal Flood Advisory	ILM	Darlington, Dillon, Marlboro	82 min

Nearby

Special Weather Statements in South Carolina, 2017 Every special weather statement in 2017

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.