Alert archive / Kentucky / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 27, NWS Louisville, KY
NWS Louisville, KY issued this severe thunderstorm warning at Apr 15, 1998, 9:56 AM CDT for Grayson County, Kentucky. It was in force for 34 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
- Apr 15, 1998, 9:56 AM CDT (14:56 UTC)
- Expired
- Apr 15, 1998, 10:30 AM CDT
- In force
- 34 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 14:55 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 15, 10:05 AM CDT | Hail 1.5 | Leitchfield, KY | 1 1/2 inch hail reported by spotter. |
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 12:00Z, 2.9 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
- 767 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 716 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 134 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.1
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.
In the hours before
Special weather statement, Apr 15, 6:25 AM CDT, 3 hours 31 minutes before
KYZ023>043-045>049-053>057-061>067-070>078-081-082-INZ076-079-083- 084-089>092-151630- CENTRAL KENTUCKY AND SOUTH-CENTRAL INDIANA SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE LOUISVILLE KY 725 AM EDT WED APR 15 1998 THE STORM PREDICTION CENTER HAS INDICATED THAT A HIGH RISK OF SEVERE WEATHER EXISTS ACROSS SOUTH CENTRAL INDIANA AND A SMALL PART OF NORTH CENTRAL KENTUCKY...MAINLY THOSE AREAS NORTH AND WEST OF LOUISVILLE. IN ADDITION A MODERATE RISK OF SEVERE WEATHER EXISTS ACROSS THE REMAINDER OF EAST AND SOUTH CENTRAL KENTUCKY AS WELL. THIS IS A POTENTIALLY DANGEROUS WEATHER SITUATION. A LOW PRESSURE CENTER OVER NORTHEAST KANSAS WILL TRACK INTO NORTH CENTRAL MISSOURI THIS AFTERNOON...WHILE AN ASSOCIATED WARM FRONT SHIFTS NORTHWARD INTO NORTHERN ILLINOIS AND INDIANA. MEANWHILE... STRONG SOUTHERLY WINDS WILL CONTINUE TO ADVECT WARM MOIST AND VERY UNSTABLE AIR INTO THE REGION AS WE HEAD INTO THE AFTERNOON HOURS. THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE MID MISSISSIPPI VALLEY THIS AFTERNOON...AND MOVE TO CENTRAL KENTUCKY AND SOUTH CENTRAL INDIANA BY EARLY EVENING...AND THEN CONTINUE ACROSS OUR REGION OVERNIGHT. THE EXPECTED INSTABILITY ALONG WITH STRONG WIND FIELDS IN THE ATMOSPHERE WILL BE FAVORABLE FOR THE DEVELOPMENT OF DAMAGING WINDS AND LARGE HAIL. TORNADOES ALSO ARE POSSIBLE WITH THE STRONGEST CELLS. SKYWARN SPOTTER ACTIVATION WILL BE NECESSARY LATER THIS AFTERNOON AND EVENING. STAY TUNED TO NOAA WEATHER RADIO FROM THE NATIONAL WEATHER SERVICE OR THE MEDIA FOR THE LATEST INFORMATION ON THIS WEATHER SITUATION. FOR MORE INFORMATION ON THIS SEVERE WEATHER OUTBREAK...PLEASE REFERENCE THE PUBLIC SEVERE WEATHER OUTLOOK (MKCPWOMKC) AS ISSUED BY THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA. VLD
Special weather statement, Apr 15, 6:25 AM CDT, 3 hours 31 minutes before
KYZ023>043-045>049-053>057-061>067-070>078-081-082-INZ076-079-083- 084-089>092-151630- CENTRAL KENTUCKY AND SOUTH-CENTRAL INDIANA SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE LOUISVILLE KY 725 AM EDT WED APR 15 1998 THE STORM PREDICTION CENTER HAS INDICATED THAT A HIGH RISK OF SEVERE WEATHER EXISTS ACROSS SOUTH CENTRAL INDIANA AND A SMALL PART OF NORTH CENTRAL KENTUCKY...MAINLY THOSE AREAS NORTH AND WEST OF LOUISVILLE. IN ADDITION A MODERATE RISK OF SEVERE WEATHER EXISTS ACROSS THE REMAINDER OF EAST AND SOUTH CENTRAL KENTUCKY AS WELL. THIS IS A POTENTIALLY DANGEROUS WEATHER SITUATION. A LOW PRESSURE CENTER OVER NORTHEAST KANSAS WILL TRACK INTO NORTH CENTRAL MISSOURI THIS AFTERNOON...WHILE AN ASSOCIATED WARM FRONT SHIFTS NORTHWARD INTO NORTHERN ILLINOIS AND INDIANA. MEANWHILE... STRONG SOUTHERLY WINDS WILL CONTINUE TO ADVECT WARM MOIST AND VERY UNSTABLE AIR INTO THE REGION AS WE HEAD INTO THE AFTERNOON HOURS. THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE MID MISSISSIPPI VALLEY THIS AFTERNOON...AND MOVE TO CENTRAL KENTUCKY AND SOUTH CENTRAL INDIANA BY EARLY EVENING...AND THEN CONTINUE ACROSS OUR REGION OVERNIGHT. THE EXPECTED INSTABILITY ALONG WITH STRONG WIND FIELDS IN THE ATMOSPHERE WILL BE FAVORABLE FOR THE DEVELOPMENT OF DAMAGING WINDS AND LARGE HAIL. TORNADOES ALSO ARE POSSIBLE WITH THE STRONGEST CELLS. SKYWARN SPOTTER ACTIVATION WILL BE NECESSARY LATER THIS AFTERNOON AND EVENING. STAY TUNED TO NOAA WEATHER RADIO FROM THE NATIONAL WEATHER SERVICE OR THE MEDIA FOR THE LATEST INFORMATION ON THIS WEATHER SITUATION. FOR MORE INFORMATION ON THIS SEVERE WEATHER OUTBREAK...PLEASE REFERENCE THE PUBLIC SEVERE WEATHER OUTLOOK (MKCPWOMKC) AS ISSUED BY THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA. VLD
The office that day
Everything else NWS Louisville, KY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 10:28 AM CDT | Severe Thunderstorm Warning | LMK | Hart | 32 min |
| Apr 15, 10:32 AM CDT | Severe Thunderstorm Warning | LMK | Larue | 33 min |
| Apr 15, 11:11 AM CDT | Severe Thunderstorm Warning | LMK | Marion, Taylor | 19 min |
| Apr 15, 12:16 PM CDT | Severe Thunderstorm Warning | LMK | Orange, Washington | 34 min |
Nearby
Severe Thunderstorm Warnings in Kentucky, 1998Every severe thunderstorm warning in 1998
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.