Alert archive / Kentucky / Tornado Watches in 1999
Tornado Watch 142
The Storm Prediction Center issued this tornado watch at Apr 9, 1999, 5:30 AM EDT for 4 states. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 9, 1999, 5:30 AM EDT (09:30 UTC)
- Expired
- Apr 9, 1999, 8:00 AM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 48 counties
Bell County, KY, Breathitt County, KY, Casey County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Harlan County, KY, Jackson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Leslie County, KY, Letcher County, KY, Lincoln County, KY, McCreary County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Wayne County, KY, Whitley County, KY, Campbell County, TN, Claiborne County, TN, Clay County, TN, Fentress County, TN, Grainger County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jackson County, TN, Overton County, TN, Pickett County, TN, Scott County, TN, Sullivan County, TN, Union County, TN, Washington County, TN, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA, McDowell County, WV
The radar
The Knoxville radar (KMRX), 87 km from the middle of the area, began a volume at 09:32 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.
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 5:35 AM EDT | Severe Thunderstorm Warning | JKL | McCreary, Pulaski | 45 min |
| Apr 9, 6:04 AM EDT | Severe Thunderstorm Warning | JKL | Laurel, Whitley | 46 min |
| Apr 9, 6:16 AM EDT | Severe Thunderstorm Warning | JKL | Knox | 34 min |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 9.5 hours before the alert went out and 238 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
- 632 J/kg
- Mixed-layer CIN
- -236 J/kg
- Mixed-layer LCL
- 1240 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 487 m²/s²
- 0-3 km storm-relative helicity
- 577 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 12:30 AM EDT | Tornado Watch | SPC | Breckinridge, Bullitt, Carroll, Daviess, Hancock, Hardin and 15 more | 5 hr |
| Apr 9, 3:00 AM EDT | Tornado Watch | SPC | Bath, Boone, Bourbon, Boyd, Boyle, Bracken and 39 more | 5 hr |
| Apr 9, 4:00 PM EDT | Severe Thunderstorm Watch | SPC | Arlington, Caroline, Charles City, Clarke, Culpeper, Essex and 36 more | 5 hr |
| Apr 9, 12:30 PM EDT | Severe Thunderstorm Watch | SPC | Barbour, Brooke, Doddridge, Gilmer, Hancock, Harrison and 15 more | 6 hr |
Nearby
Tornado Watches in Kentucky, 1999Tornado Watches in Tennessee, 1999Tornado Watches in Virginia, 1999Every tornado watch 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.