Alert archive / South Carolina / Special Weather Statements in 2018

Special Weather Statement, NWS Greenville-Spartanburg, SC

August 8, 2018Union County, South Carolina

NWS Greenville-Spartanburg, SC issued this special weather statement at Aug 8, 2018, 8:26 PM EDT for Union County, South Carolina. It was in force for 49 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 8, 2018, 8:26 PM EDT (00:26 UTC)
Expired
Aug 8, 2018, 9:15 PM EDT
In force
49 min
Issued by
NWS Greenville-Spartanburg, SC

County Union County, SC

The radar

The Greer radar (KGSP), 68 km from the middle of the area, began a volume at 00:27 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.4 hours before the alert went out and 216 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 00:00Z on 2018-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 147 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 00:00Z on 2018-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -67 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
147 J/kg
Mixed-layer CIN
-148 J/kg
Mixed-layer LCL
1370 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-67 m²/s²
0-3 km storm-relative helicity
-90 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this special weather statement went out at Aug 8, 8:24 PM EDT, 2 minutes earlier.

Area forecast discussion, Aug 8, 8:24 PM EDT, 2 minutes before
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Hazardous weather outlook, Aug 8, 4:39 AM EDT, 15 hours 47 minutes before
Hazardous Weather Outlook
National Weather Service Greenville-Spartanburg SC
439 AM EDT Wed Aug 8 2018

NCZ033-048>053-058-059-062>065-501>507-509-090845-
Avery-Madison-Yancey-Mitchell-Swain-Haywood-Buncombe-Graham-
Northern Jackson-Macon-Southern Jackson-Transylvania-Henderson-
Caldwell Mountains-Greater Caldwell-Burke Mountains-Greater Burke-
McDowell Mountains-Eastern McDowell-Rutherford Mountains-
Polk Mountains-
439 AM EDT Wed Aug 8 2018

This Hazardous Weather Outlook is for the mountains and northern
foothills of western North Carolina.

.DAY ONE...Today and tonight.

Thunderstorms will develop across the mountains by early afternoon
and increase in coverage before racing east through early evening.
Any of these thunderstorms will have the potential to produce cloud-
to-ground lightning, gusty winds, and heavy rainfall. Isolated
flooding may develop in any locations impacted by multiple showers.
In addition, a few of the thunderstorms could become severe this
afternoon, with damaging wind gusts being the primary threat.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thunderstorm coverage will remain fairly high each afternoon and
evening from Thursday through next Monday. The main impacts will be
cloud-to-ground lightning, heavy rainfall, and gusty winds. Isolated
flooding will be possible each day as the rainfall totals accrue.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to forward any reports of large hail,
damaging winds, tornadoes, or flash flooding to our office.

GAZ010-017-018-026-028-029-NCZ035>037-056-057-068>072-082-508-510-
SCZ001>014-019-090845-
Rabun-Habersham-Stephens-Franklin-Hart-Elbert-Alexander-Iredell-
Davie-Catawba-Rowan-Cleveland-Lincoln-Gaston-Mecklenburg-Cabarrus-
Union-Greater Rutherford-Eastern Polk-Oconee Mountains-
Pickens Mountains-Greenville Mountains-Greater Oconee-
Greater Pickens-Greater Greenville-Spartanburg-Cherokee-York-
Anderson-Abbeville-Laurens-Chester-Greenwood-
439 AM EDT Wed Aug 8 2018

This Hazardous Weather Outlook is for northeast Georgia, the piedmont
and southern foothills of western North Carolina, and Upstate South
Carolina.

.DAY ONE...Today and tonight.

Scattered to numerous thunderstorms will develop from the west this
afternoon and then race eastward across the piedmont through the
evening hours. Any of these thunderstorms will have the potential to
produce frequent cloud-to-ground lightning, gusty winds, and heavy
rainfall. Isolated flooding may develop in any locations impacted by
multiple showers or thunderstorms. In addition, a few of the
thunderstorms could become severe this afternoon and evening, with
damaging wind gusts being the primary threat.

In addition, Heat Index values should reach 95 to 100 degrees this
afternoon and evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thunderstorm coverage will remain fairly high each afternoon and
evening from Thursday through next Monday. The main impacts will be
cloud-to-ground lightning, heavy rainfall, and gusty winds. Isolated
flooding will be possible each day as the rainfall totals accrue.

Heat Index values of 95 to 100 will be likely once again on
Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to forward any reports of large hail,
damaging winds, tornadoes, or flash flooding to our office.

HG

In the hours before

Special weather statement, Aug 8, 7:25 PM EDT, 1 hour 1 minute before
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Local storm report, Aug 8, 7:56 PM EDT, 30 minutes before
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Local storm report, Aug 8, 7:58 PM EDT, 28 minutes before
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Local storm report, Aug 8, 8:11 PM EDT, 15 minutes before
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Local storm report, Aug 8, 8:14 PM EDT, 12 minutes before
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Special weather statement, Aug 8, 8:26 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.

IssuedProductOfficeCountiesLasted
Aug 9, 7:37 PM EDTSpecial Weather StatementGSPHenderson23 min
Aug 9, 7:59 PM EDTSpecial Weather StatementGSPHenderson31 min
Aug 9, 5:08 PM EDTSpecial Weather StatementGSPGreenville52 min
Aug 9, 5:08 PM EDTSevere Thunderstorm WarningGSPLaurens29 min
Aug 9, 5:38 PM EDTAreal Flood AdvisoryGSPGreenville3 hr
Aug 9, 5:44 PM EDTSevere Thunderstorm WarningGSPGreenville, Laurens, Spartanburg46 min
Aug 9, 5:56 PM EDTSevere Thunderstorm WarningGSPGreenville, Pickens23 min
Aug 9, 6:29 PM EDTSpecial Weather StatementGSPLaurens46 min
Aug 9, 6:43 PM EDTSevere Thunderstorm WarningGSPOconee31 min
Aug 9, 6:48 PM EDTSpecial Weather StatementGSPPickens42 min
Aug 9, 6:52 PM EDTSpecial Weather StatementGSPGreenville38 min
Aug 9, 7:12 PM EDTSpecial Weather StatementGSPAnderson48 min
Aug 9, 7:17 PM EDTSpecial Weather StatementGSPGreenwood43 min
Aug 9, 7:51 PM EDTSevere Thunderstorm WarningGSPAbbeville, Anderson, Greenwood, Laurens24 min
Aug 9, 5:48 PM EDTSpecial Weather StatementGSPHabersham, Stephens42 min

Nearby

Special Weather Statements in South Carolina, 2018Every special weather statement 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.