Alert archive / North Carolina / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 24, NWS Greenville-Spartanburg, SC

May 6, 1999Jackson County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 6, 1999, 2:28 AM EDT for Jackson County, North Carolina. It was in force for 47 min. 1 report 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 6, 1999, 2:28 AM EDT (06:28 UTC)
Expired
May 6, 1999, 3:15 AM EDT
In force
47 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Whole counties

County Jackson County, NC

The radar

The Greer radar (KGSP), 95 km from the middle of the area, began a volume at 06:30 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 6, 2:45 AM EDTThunderstorm Wind 60Balsam, NC

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 6, 1:45 AM EDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 6.5 hours before the alert went out and 247 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, Peachtre/Fal Fld, GA at 00:00Z on 1999-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 645 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, Peachtre/Fal Fld, GA at 00:00Z on 1999-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 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
645 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
1.0
Supercell composite
9.1

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 6, 2:13 AM EDT, 15 minutes earlier.

Area forecast discussion, May 6, 2:13 AM EDT, 15 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
213 AM EDT THU MAY 6 1999

INITIAL CONCERNS ARE RECENT TORNADO WATCH BOX JUST ISSUED FOR
NORTHERN GEORGIA...AND NEW SVR TSTM BOX FOR XTRM WRN CAROLINAS
THROUGH PREDAWN. CONVECTION FIRING RAPIDLY AHEAD OF MAIN SQUALL
LINE...ATMOS QUITE JUICY AHEAD OF THESE STORMS AND WITH DIFFLUENT
FLOW IN PLACE AND ISENTROPIC LIFT IN PLACE...STORMS SHOULD AT LEAST
MAINTAIN THIERR CURRENT INTENSITY TIL LATE IN PREDAWN WHEN THEY MOVE
FAR AHEAD OF UPR SUPPORT.

NGM/ETA ARE QUITE SIMILAR IN THEIR HANDLING OF SURFACE FRONT AND
SUGGSTING THAT JUST SLOW EWRD PROGRESS OF THIS FEATURE WILL CONTINUE
AS UPR LOW CONTINUES TO SPIN AND ACTUALLY PULL A LITTLE NORTHWARD
THROUGH 00Z SAT. VARIOUS PIECES OF SHORTWAVE ENERGY PULL AWAY FROM
BASE OF UPR TROUGH...NGM A BIT STRONGER WITH THESE. BOTH AGREE THAT
PIECE PULLING EWRD LATE AFTN AND TNT WILL WEAKEN BUT MOVE OVR STHRN
PART OF CWFA...WITH THETA-E RIDGE IN PLACE OVR REGION AND SOME DVRG
ALF. CAPES SURGE TWRD 1500 J/KG IN EAST BUT THAT WHOLLY DEPENDENT ON
GETTING SOME SUN IN EAST. THINK THERE WILL BE A LOT OF CLOUDS ARND
AS YESTERDAY AND WILL KEEP TEMP CLIMBS TO A MINIMUM. TIME SECTIONS
STILL SUGST A GOOD VEERING WIND SIGNATURE OVR MOST OF CWFA AND
WUDNT RULE OUT SVR BUT SPC HAS SLGHT RISK AREA TO OUR WEST TDY.
REGARDLESS...WITH DEEPEST MOISTR OF THE WEEK IN PLACE TDY...WILL GO
CATEGORICAL POPS ALL AREAS TDY...WITH LIKELY FOR TNT. NO DOUBT WILL
SEE CONVECTIVE ACTIVITY ONGOING THIS EVENG ACROSS TENNESSEE THAT
WILL AFFECT WRN AREAS IN PREDAWN...AND EXPECT QUITE A BIT OF RW/TRW
IN ERN MOST CWFA AT SUNDOWN.

MDLS SUGST FRONT INTO ERN TN BY 00Z SAT...WITH GRDL COOLING OF
TEMPS ALF AS STRONGEST PIECE OF SHORTWAVE ENERGY YET GETS SHUNTED
NW OF CWFA...BUT STILL SOME IMPRESSIVE DPVA IN PLACE FOR WEST. BEST
INSTABILITY WILL BE OVR STHRN MOST CWFA...WITH ETA SUGSTNG SOME
BETTER JET DYNAMICS IN PLACE FOR US FRIDAY AFTN. HVR...MOISTR NOT
AS DEEP. IN ANY EVENT...WILL GO WITH LIKELY TO CATEGORICAL POPS FOR
FRIDAY. TEMPS...BLO GUIDANCE TDY...NEAR NGM MAXES FRI WITH ABUNDANT
CLOUDINESS EXPECTED.

AVL TT 070/060 072/058 076 44978
CLT TT 075/062 077/062 079 44876
GSP TT 075/063 078/063 079 44877

.GSP...NONE.

BURRUS

In the hours before

Special weather statement, May 5, 10:57 PM EDT, 3 hours 31 minutes before
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Local storm report, May 6, 1:44 AM EDT, 44 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE SPARTANBURG SC
144 AM EDT THU MAY 06 1999

TIME (EDT) .....CITY LOCATION....... ST   ...EVENT/REMARKS...
           .....COUNTY LOCATION.....

141 AM     CLAYTON                   GA   1.00 INCH HAIL
05/06/99   RABUN                          REPORTED BY COUNTY 911.

CSH

The office that day

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

IssuedProductOfficeCountiesLasted
May 6, 1:52 AM EDTSevere Thunderstorm WarningGSPMacon48 min
May 6, 1:59 AM EDTSevere Thunderstorm WarningGSPSwain51 min
May 6, 2:49 AM EDTSevere Thunderstorm WarningGSPHaywood36 min
May 6, 5:05 AM EDTSevere Thunderstorm WarningGSPJackson35 min
May 6, 5:30 AM EDTSevere Thunderstorm WarningGSPHaywood30 min
May 6, 6:04 AM EDTSevere Thunderstorm WarningGSPBuncombe36 min
May 6, 6:22 AM EDTTornado WarningGSPBuncombe, McDowell, Yancey33 min
May 6, 11:39 AM EDTSevere Thunderstorm WarningGSPLaurens46 min
May 6, 12:00 PM EDTSevere Thunderstorm WarningGSPUnion50 min
May 6, 1:50 PM EDTSevere Thunderstorm WarningGSPGreenwood25 min
May 6, 1:18 AM EDTSevere Thunderstorm WarningGSPRabun32 min

Nearby

Severe Thunderstorm Warnings in North 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.