Alert archive / South Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Greenville-Spartanburg, SC

August 18, 2012Greenwood County, Laurens County, South Carolina

NWS Greenville-Spartanburg, SC issued this special weather statement at Aug 18, 2012, 1:11 PM EDT for Greenwood County, Laurens County, South Carolina. It was in force for 34 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 18, 2012, 1:11 PM EDT (17:11 UTC)
Expired: Aug 18, 2012, 1:45 PM EDT
In force: 34 min
Issued by: NWS Greenville-Spartanburg, SC

Counties Greenwood County, SC, Laurens County, SC

The radar

The Greer radar (KGSP), 73 km from the middle of the area, began a volume at 17:12 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 5.2 hours before the alert went out and 250 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: 509 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this special weather statement went out at Aug 18, 10:50 AM EDT, 2 hours 21 minutes earlier.

Area forecast discussion, Aug 18, 10:50 AM EDT, 2 hours 21 minutes before

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Hazardous weather outlook, Aug 18, 11:01 AM EDT, 2 hours 10 minutes before

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In the hours before

Special weather statement, Aug 18, 7:23 AM EDT, 5 hours 48 minutes before

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Special weather statement, Aug 18, 12:24 PM EDT, 47 minutes before

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Special weather statement, Aug 18, 1:11 PM EDT, 0 minutes before

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The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 18, 12:24 PM EDT	Special Weather Statement	GSP	Abbeville, Greenwood, Laurens	51 min
Aug 18, 7:08 PM EDT	Special Weather Statement	GSP	Oconee	37 min

Nearby

Special Weather Statements in South Carolina, 2012 Every special weather statement in 2012

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.