Alert archive / South Carolina / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 7, NWS Greenville-Spartanburg, SC
NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Apr 8, 1999, 4:41 PM EDT for Anderson County, South Carolina. It was in force for 49 min. 2 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
- Apr 8, 1999, 4:41 PM EDT (20:41 UTC)
- Expired
- Apr 8, 1999, 5:30 PM EDT
- In force
- 49 min
- Issued by
- NWS Greenville-Spartanburg, SC
- Area
- Whole counties
County Anderson County, SC
The radar
The Greer radar (KGSP), 56 km from the middle of the area, began a volume at 20:40 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 |
|---|---|---|---|
| Apr 8, 4:45 PM EDT | Thunderstorm Wind 50 | Pelzer, SC | |
| Apr 8, 4:50 PM EDT | Thunderstorm Wind 50 | West Pelzer, 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
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.7 hours before the alert went out and 214 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
- 794 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 904 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
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 Apr 8, 1:35 PM EDT, 3 hours 6 minutes earlier.
Area forecast discussion, Apr 8, 1:35 PM EDT, 3 hours 6 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 135 PM EDT THU APR 8 1999 UPPER IMPULSE TO CROSS REGION OVERNIGHT WITH DEEP MOISTURE IN PLACE. DRYING NOTED IN MID AND UPPER LEVELS FRI AND ALTHOUGH UPPER DYNAMICS LACKING FRI AND FRI NIGHT...SPEED/DIRECTIONAL SHEAR PERSIST AND INSTABILITY INCREASES WHILE NOSE OF SUPTROPICAL JET MAX MOVES OVER AREA. MOISTURE AXIS APPROACHES SAVANNAH VALLEY FROM THE SW LATE FRI NIGHT WITH ARRIVAL OF MID LEVEL LIFT. BACK DOOR FRONT TO DROP INTO NC LATE FRI NIGHT STALLING NEAR I-40 SAT. TEMPERATURES NEAR PERSISTANCE WITH WARM SECTOR IN PLACE. CLOUD COVER SAT TO MODERATE MAXIMUMS. MOISTURE TO HOLD MINIMUMS UP. AVL 56/80/53/76 5445 CLT 58/84/56/83 5334 GSP 59/85/57/82 5334 .GSP...NONE JAT
The office that day
Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 4:14 PM EDT | Severe Thunderstorm Warning | GSP | Oconee | 46 min |
| Apr 8, 5:07 PM EDT | Severe Thunderstorm Warning | GSP | Abbeville | 48 min |
| Apr 8, 5:13 PM EDT | Tornado Warning | GSP | Abbeville | 47 min |
| Apr 8, 5:55 PM EDT | Severe Thunderstorm Warning | GSP | Anderson | 50 min |
| Apr 8, 7:05 PM EDT | Severe Thunderstorm Warning | GSP | Greenwood | 50 min |
| Apr 8, 4:54 PM EDT | Severe Thunderstorm Warning | GSP | Elbert | 51 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.