Alert archive / South Carolina / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 338, NWS Greenville-Spartanburg, SC

September 26, 20184 counties in South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Sep 26, 2018, 5:13 PM EDT for 4 counties in South Carolina. It was in force for 47 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: Sep 26, 2018, 5:13 PM EDT (21:13 UTC)
Expired: Sep 26, 2018, 6:00 PM EDT
In force: 47 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Abbeville County, SC, Anderson County, SC, Greenville County, SC, Laurens County, SC

The radar

The Greer radar (KGSP), 42 km from the middle of the area, began a volume at 21:16 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, 9.2 hours before the alert went out and 235 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: 903 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 681 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 15 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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 26, 3:03 PM EDT, 2 hours 10 minutes earlier.

Area forecast discussion, Sep 26, 3:03 PM EDT, 2 hours 10 minutes before

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Hazardous weather outlook, Sep 26, 6:35 AM EDT, 10 hours 38 minutes before

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In the hours before

Special weather statement, Sep 26, 3:45 PM EDT, 1 hour 28 minutes before

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Special weather statement, Sep 26, 4:15 PM EDT, 58 minutes before

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Special weather statement, Sep 26, 4:46 PM EDT, 27 minutes before

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Special weather statement, Sep 26, 4:53 PM EDT, 20 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
Sep 26, 2:50 PM EDT	Flash Flood Watch	GSP	Avery, Graham, Haywood, Jackson, Macon, Madison and 3 more	32 hr
Sep 26, 3:45 PM EDT	Special Weather Statement	GSP	Lincoln	45 min
Sep 26, 4:15 PM EDT	Special Weather Statement	GSP	Polk, Rutherford	45 min
Sep 26, 4:46 PM EDT	Special Weather Statement	GSP	Davie	29 min
Sep 26, 4:53 PM EDT	Special Weather Statement	GSP	Anderson	52 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2018 Every severe thunderstorm warning in 2018

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.