Alert archive / South Carolina / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 90, NWS Charleston, SC
NWS Charleston, SC issued this severe thunderstorm warning at Aug 19, 1999, 11:51 PM EDT for Allendale County, South Carolina. It was in force for 64 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
- Aug 19, 1999, 11:51 PM EDT (03:51 UTC)
- Expired
- Aug 20, 1999, 12:55 AM EDT
- In force
- 64 min
- Issued by
- NWS Charleston, SC
- Area
- Whole counties
County Allendale County, SC
The radar
The Charleston,SC radar (KCLX), 47 km from the middle of the area, began a volume at 03:51 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 |
|---|---|---|---|
| Aug 20, 12:00 AM EDT | Thunderstorm Wind 50 | Martin, SC | Numerous trees down along route 125. |
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
Charleston AFB, SC (KCHS), launched 00:00Z, 3.9 hours before the alert went out and 127 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
- 2982 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 935 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Charleston, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 10:04 PM EDT, 1 hour 47 minutes earlier.
Area forecast discussion, Aug 19, 10:04 PM EDT, 1 hour 47 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHARLESTON SC 1004 PM EDT THU AUG 19 1999 ONLY MINOR CHGS REFLECTED IN ZONE UPDATE. WILL KEEP AT LEAST SLGT CHC PRECIP THROUGH THE RMNDR OF THE NGT. .CWF...DO NOT ANTICIPATE ANY SIG CHNGS ATTM. .CHS... SC...NONE. GA...NONE. JAC/JCI
In the hours before
Local storm report, Aug 19, 10:08 PM EDT, 1 hour 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1008 PM EDT THU AUG 19 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0640 PM ALLENDALE SC WIND DAMAGE
08/14/99 ALLENDALE SEVERAL TREES DOWN
JACLocal storm report, Aug 19, 10:08 PM EDT, 1 hour 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1008 PM EDT THU AUG 19 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0640 PM ALLENDALE SC WIND DAMAGE
08/14/99 ALLENDALE SEVERAL TREES DOWN
JACThe office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 8:21 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Dorchester | 64 min |
| Aug 19, 8:49 PM EDT | Severe Thunderstorm Warning | CHS | Charleston | 61 min |
| Aug 20, 12:03 AM EDT | Tornado Warning | CHS | Allendale | 32 min |
| Aug 20, 7:07 PM EDT | Severe Thunderstorm Warning | CHS | Hampton | 58 min |
| Aug 20, 5:59 PM EDT | Severe Thunderstorm Warning | CHS | Jenkins | 46 min |
| Aug 20, 6:29 PM EDT | Severe Thunderstorm Warning | CHS | Bulloch, Screven | 61 min |
| Aug 20, 6:39 PM EDT | Severe Thunderstorm Warning | CHS | Candler | 36 min |
| Aug 20, 7:07 PM EDT | Severe Thunderstorm Warning | CHS | Bryan | 58 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.