Alert archive / Kentucky / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 39, NWS Louisville, KY
NWS Louisville, KY issued this severe thunderstorm warning at Apr 9, 1999, 4:08 AM CDT for Clinton County, Cumberland County, Russell County, Kentucky. It was in force for 32 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 9, 1999, 4:08 AM CDT (09:08 UTC)
- Expired
- Apr 9, 1999, 4:40 AM CDT
- In force
- 32 min
- Issued by
- NWS Louisville, KY
- Area
- Whole counties
Counties Clinton County, KY, Cumberland County, KY, Russell County, KY
The radar
The Nashville radar (KOHX), 139 km from the middle of the area, began a volume at 09:08 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 9, 4:30 AM CDT | Thunderstorm Wind 50 | Jamestown, KY | Numerous trees down...Power out at WJRS radio station |
| Apr 9, 4:35 AM CDT | Thunderstorm Wind 50 | Aaron, KY | Trees down |
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
Nashville Metro, TN (KBNA), launched 00:00Z, 9.1 hours before the alert went out and 148 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
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSDF 090910 RRA SVRSDF KYC053-057-207-090940- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE LOUISVILLE KY 508 AM EDT (408 AM CDT) FRI APR 9 1999 THE NATIONAL WEATHER SERVICE IN LOUISVILLE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CLINTON COUNTY IN SOUTH CENTRAL KENTUCKY EASTERN CUMBERLAND COUNTY IN SOUTH CENTRAL KENTUCKY SOUTHERN RUSSELL COUNTY IN SOUTH CENTRAL KENTUCKY * UNTIL 440 AM CDT (540 AM EDT) * AT 405 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 40 MILES SOUTHWEST OF SOMERSET FROM NEAR AMANDAVILLE TO BURKESVILLE... MOVING EAST AT 50 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... CREELSBORO AT 415 AM CDT LAKE CUMBERLAND AT 420 AM CDT CUMBERLAND CITY AT 425 AM CDT DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! REITMEYER/FUNK
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 Louisville, KY wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 9, 3:08 AM CDT, 1 hour earlier.
Area forecast discussion, Apr 9, 3:08 AM CDT, 1 hour before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOUISVILLE, KY 408 AM EDT FRI APR 9 1999 ...MAIN FORECAST CHALLENGES ARE TIMING OF THUNDERSTORM ACTIVITY OUT OF THE EAST EARLY THIS MORNING AND CHANCE OF CONVECTION SATURDAY... CURRENT THUNDERSTORM ACTIVITY SHOULD BE OUT OF MAJORITY OF FA BY DAYBREAK. WILL PROBABLY LEAVE PRECIP OUT OF NEW FORECAST EXCEPT FOR NE ZONES WHERE TOR WATCH 141 IS IN EFFECT UNTIL 800 AM EDT. LATEST SURFACE ANALYSIS INDICATES SFC LOW CENTERED OVER FAR SE IA AND IS PROGGED TO MOVE EASTWARD AND SLOWLY WEAKEN TODAY. TIME-HEIGHT CROSS SECTIONS SHOW LOW LEVEL MOISTURE LINGERING ACROSS THE AREA TODAY. HOWEVER... SATELLITE PICTURES INDICATE NICE CLEARING OCCURRING BEHIND COOL FRONT. WITH A LITTLE CAA EXPECTED BEHIND COOL FRONT TODAY...HAVE LOOKED AT ETA AND NGM CU RULE MACROS ON PCGRIDDS. WHILE SKIES SHOULD BECOME MOSTLY CLEAR THIS MORNING...SCATTERED LOW CLOUDS MAY DEVELOP WITH SOME HEATING. WILL PROBABLY KEEP PARTLY SUNNY WORDING FOR NOW. WEAK HIGH PRESSURE TO ADVANCE INTO THE REGION THIS EVENING WHILE DECENT WAA DEVELOPS AT H85 LATER TONIGHT AHEAD OF NEXT SYSTEM. AS A RESULT...CLOUDS SHOULD BE ON THE INCREASE AND HAVE WORDED ACCORDINGLY. WHILE ETA IS A THE FASTEST WITH NEXT SYSTEM...FEEL ADDING A CHANCE OF CONVECTION IN FOR SATURDAY NECESSARY. SFC LOW PROGGED TO TAKE NEARLY THE SAME TRACK AS TONIGHT/S LOW AND POTENTIAL FOR SEVERE WX LOOKS EVEN BETTER THAN TONIGHT AS MOST OF FA SHOULD BE IN THE WARM SECTOR BY AFTERNOON. HAVE ALSO AMENDED EXTENDED TO BREAK OUT SATURDAY NIGHT FOR STORMS AND MADE SUNDAY DRY. NGM AND AVN GUIDANCE TEMPS LOOK FAIRLY REASONABLE. SDF...NONE MARIEN
The office that day
Everything else NWS Louisville, KY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 1:00 AM CDT | Severe Thunderstorm Warning | LMK | Scott | 30 min |
| Apr 9, 2:49 AM CDT | Severe Thunderstorm Warning | LMK | Jefferson, Oldham | 41 min |
| Apr 9, 3:39 AM CDT | Severe Thunderstorm Warning | LMK | Monroe | 26 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.