Alert archive / South Carolina / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 41, NWS Greenville-Spartanburg, SC

May 13, 1999Spartanburg County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 13, 1999, 2:51 PM EDT for Spartanburg County, South Carolina. It was in force for 64 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 13, 1999, 2:51 PM EDT (18:51 UTC)
Expired
May 13, 1999, 3:55 PM EDT
In force
64 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Whole counties

County Spartanburg County, SC

The radar

The Greer radar (KGSP), 22 km from the middle of the area, began a volume at 18:53 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.

What was reported inside it

TimeReportWhereRemark
May 13, 2:55 PM EDTHail 1Lyman, SC
May 13, 3:04 PM EDTHail 1.5Duncan, SC
May 13, 3:20 PM EDTThunderstorm Wind 50Spartanburg, SC

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.9 hours before the alert went out and 228 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 12:00Z on 1999-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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 12:00Z on 1999-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -34 square meters per square second.1939Sfc1 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
4 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1230 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-34 m²/s²
0-3 km storm-relative helicity
-28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 May 13, 2:30 PM EDT, 21 minutes earlier.

Area forecast discussion, May 13, 2:30 PM EDT, 21 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
230 PM EDT THU MAY 13 1999

VORT MAX SEEN SPINNING INTO CENTRAL TN ON WATER VAPOR IMAGERY IS
PROGGED TO SLOWLY CHURN ACROSS THE WRN CAROLINAS TONIGHT AND INTO EARLY
FRIDAY. LOBES OF DPVA COMBINED WITH INSTABILITY AND LOW WBZ HEIGHTS
TONIGHT WILL CONTINUE THE THREAT FOR LARGE HAIL WHILE MODERATE DRY
PUNCH AT MID LEVELS COULD ALLOW FOR NEAR SEVERE WIND GUSTS. COUPLED
DIVERGENCE WITH THE UPPER JETS STAYS MAINLY ALONG NC/VA BORDER...
PROVIDING SUPPORT FARTHER N THAN MAIN INSTABILITY OVERNIGHT.

WILL MENTION MAINLY RAIN FRI BUT WITH TSTM PSBL OVER SRN PORTIONS
WITH UPPER COLD POOL PASSAGE AND CONVERGENCE WITH LOW. DEEP MOIST NE
FLOW DEVELOPS IN WAKE OF LOW WITH LOW LEVEL THCK FALLS TOMORROW.
EASTERLY COMPONENT COULD YIELD UPSLOPE FLOW AND LIGHT RAIN FOR FRI
NIGHT WHILE WEAK ISENTROPIC LIFT MAY AFFECT EASTERN PIEDMONT SECTION
THROUGH EARLY SAT.

TEMPS AND POPS WILL BE MUCH MORE IN LINE WITH COOLER WETTER FAN GIVEN
STRENGTH OF UPPER LOW AND COOL ADVECTION BEHIND SYSTEM. ONLY DEVIATION
WILL BE WARMER OVERNIGHT MINS TONIGHT GIVEN CURRENT DEWPOINTS AND
UPSTREAM PRECIP.

WRKGSP TO CAE AROUND 315 PM.

AVL 56/67/52/68 6642
CLT 61/70/52/67 6753
GSP 60/70/53/68 6642

.GSP...NONE.

HG

In the hours before

Special weather statement, May 13, 10:42 AM EDT, 4 hours 9 minutes before
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Special weather statement, May 13, 10:42 AM EDT, 4 hours 9 minutes before
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Special weather statement, May 13, 10:42 AM EDT, 4 hours 9 minutes before
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Local storm report, May 13, 2:30 PM EDT, 21 minutes before
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Local storm report, May 13, 2:30 PM EDT, 21 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 13, 5:12 PM EDTSevere Thunderstorm WarningGSPPolk63 min
May 13, 5:27 PM EDTSevere Thunderstorm WarningGSPHenderson33 min
May 13, 5:52 PM EDTSevere Thunderstorm WarningGSPUnion63 min
May 13, 6:24 PM EDTSevere Thunderstorm WarningGSPMecklenburg36 min
May 13, 7:59 PM EDTSevere Thunderstorm WarningGSPAvery36 min
May 13, 3:37 PM EDTSevere Thunderstorm WarningGSPCherokee, Union63 min
May 13, 7:27 PM EDTSevere Thunderstorm WarningGSPSpartanburg33 min
May 13, 5:40 PM EDTSevere Thunderstorm WarningGSPElbert65 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 1999Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.