Alert archive / North Carolina / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 24, NWS Greenville-Spartanburg, SC
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
| Time | Report | Where | Remark |
|---|---|---|---|
| May 6, 2:45 AM EDT | Thunderstorm Wind 60 | Balsam, 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 6, 1:45 AM EDT | Severe Thunderstorm Watch | SPC | 4 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.
- 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
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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</html>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.
CSHThe office that day
Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 1:52 AM EDT | Severe Thunderstorm Warning | GSP | Macon | 48 min |
| May 6, 1:59 AM EDT | Severe Thunderstorm Warning | GSP | Swain | 51 min |
| May 6, 2:49 AM EDT | Severe Thunderstorm Warning | GSP | Haywood | 36 min |
| May 6, 5:05 AM EDT | Severe Thunderstorm Warning | GSP | Jackson | 35 min |
| May 6, 5:30 AM EDT | Severe Thunderstorm Warning | GSP | Haywood | 30 min |
| May 6, 6:04 AM EDT | Severe Thunderstorm Warning | GSP | Buncombe | 36 min |
| May 6, 6:22 AM EDT | Tornado Warning | GSP | Buncombe, McDowell, Yancey | 33 min |
| May 6, 11:39 AM EDT | Severe Thunderstorm Warning | GSP | Laurens | 46 min |
| May 6, 12:00 PM EDT | Severe Thunderstorm Warning | GSP | Union | 50 min |
| May 6, 1:50 PM EDT | Severe Thunderstorm Warning | GSP | Greenwood | 25 min |
| May 6, 1:18 AM EDT | Severe Thunderstorm Warning | GSP | Rabun | 32 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.