Alert archive / Kentucky / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 18, NWS Louisville, KY
NWS Louisville, KY issued this severe thunderstorm warning at Feb 11, 1999, 9:27 PM CST for Grayson County, Kentucky. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 11, 1999, 9:27 PM CST (03:27 UTC)
- Expired
- Feb 11, 1999, 10:00 PM CST
- In force
- 33 min
- Issued by
- NWS Louisville, KY
- Area
- Whole counties
County Grayson County, KY
The radar
The Louisville radar (KLVX), 67 km from the middle of the area, began a volume at 03:28 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Feb 11, 8:00 PM CST | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 3.5 hours before the alert went out and 150 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
- 264 J/kg
- Mixed-layer CIN
- -106 J/kg
- Mixed-layer LCL
- 1094 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 255 m²/s²
- 0-3 km storm-relative helicity
- 348 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 0.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS Louisville, KY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 11, 8:40 PM CST | Severe Thunderstorm Warning | LMK | Ohio | 20 min |
| Feb 11, 9:00 PM CST | Severe Thunderstorm Warning | LMK | Logan, Simpson, Warren | 30 min |
| Feb 11, 9:31 PM CST | Severe Thunderstorm Warning | LMK | Warren | 34 min |
| Feb 11, 11:52 PM CST | Severe Thunderstorm Warning | LMK | Cumberland | 33 min |
| Feb 11, 8:22 PM CST | Severe Thunderstorm Warning | LMK | Crawford, Perry | 18 min |
| Feb 11, 8:30 PM CST | Severe Thunderstorm Warning | LMK | Orange, Washington | 20 min |
| Feb 11, 8:56 PM CST | Severe Thunderstorm Warning | LMK | Scott, Washington | 34 min |
Nearby
Severe Thunderstorm Warnings in Kentucky, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.