Alert archive / Indiana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 31, NWS Indianapolis, IN
NWS Indianapolis, IN issued this severe thunderstorm warning at May 20, 1998, 1:04 PM EST for Knox County, Indiana. It was in force for 46 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
- May 20, 1998, 1:04 PM EST (18:04 UTC)
- Expired
- May 20, 1998, 1:50 PM EST
- In force
- 46 min
- Issued by
- NWS Indianapolis, IN
- Area
- Whole counties
County Knox County, IN
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 1:41 PM EST | Thunderstorm Wind | Monroe City, IN | Trees downed. |
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
Lincoln, IL (KILX), launched 12:00Z, 6.1 hours before the alert went out and 192 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
- 618 J/kg
- Mixed-layer CIN
- -260 J/kg
- Mixed-layer LCL
- 1294 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
182 WUUS1 KIND 201805 RRA SVRIND INC083-201850- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE INDIANAPOLIS IN 104 PM EST WED MAY 20 1998 THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... KNOX COUNTY IN SOUTHWESTERN INDIANA * UNTIL 150 PM EST * AT 100 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES WEST OF VINCENNES... MOVING EAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... VINCENNES BY 115 PM EST DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS TMA
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, May 20, 11:54 AM EST, 1 hour 10 minutes before
INZ021-028>031-035>049-051>057-060>065-067>072-202100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 1154 AM EST WED MAY 20 1998 ...SEVERE STORMS POSSIBLE THIS AFTERNOON AND EVENING OVER CENTRAL AND SOUTHERN INDIANA... THE THREAT EXISTS FOR SEVERE THUNDERSTORMS ACROSS CENTRAL AND SOUTHERN INDIANA THIS AFTERNOON AND EVENING. THE THREAT IS PRIMARILY NEAR AND SOUTH OF A LAFAYETTE TO RICHMOND LINE. WESTERN INDIANAS THREAT PERIOD WILL BEGIN BY MID AFTERNOON WHILE EASTERN INDIANA WILL NOT LIKELY SEE ANY STORMS BEFORE EARLY EVENING. THE GREATEST LIKELHOOD FOR SEVERE WEATHER IS ACROSS SOUTHWEST INDIANA. THE MAIN THREATS WILL BE DAMAGING WINDS AND POTENTIAL FLOODING FROM HEAVY RAINFALL. LARGE HAIL WILL ALSO BE POSSIBLE. A FRONTAL BOUNDARY ACROSS CENTRAL PORTIONS OF ILLINOIS...INDIANA AND OHIO WILL SERVE AS THE FOCUS FOR STORM DEVELOPMENT ONCE AN UPPER AIR DISTURBANCE OVER IOWA THIS MORNING MOVES OVER SOUTHERN INDIANA BY THIS EVENING. SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND EVENING. TUCEK
Special weather statement, May 20, 11:54 AM EST, 1 hour 10 minutes before
INZ021-028>031-035>049-051>057-060>065-067>072-202100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 1154 AM EST WED MAY 20 1998 ...SEVERE STORMS POSSIBLE THIS AFTERNOON AND EVENING OVER CENTRAL AND SOUTHERN INDIANA... THE THREAT EXISTS FOR SEVERE THUNDERSTORMS ACROSS CENTRAL AND SOUTHERN INDIANA THIS AFTERNOON AND EVENING. THE THREAT IS PRIMARILY NEAR AND SOUTH OF A LAFAYETTE TO RICHMOND LINE. WESTERN INDIANAS THREAT PERIOD WILL BEGIN BY MID AFTERNOON WHILE EASTERN INDIANA WILL NOT LIKELY SEE ANY STORMS BEFORE EARLY EVENING. THE GREATEST LIKELHOOD FOR SEVERE WEATHER IS ACROSS SOUTHWEST INDIANA. THE MAIN THREATS WILL BE DAMAGING WINDS AND POTENTIAL FLOODING FROM HEAVY RAINFALL. LARGE HAIL WILL ALSO BE POSSIBLE. A FRONTAL BOUNDARY ACROSS CENTRAL PORTIONS OF ILLINOIS...INDIANA AND OHIO WILL SERVE AS THE FOCUS FOR STORM DEVELOPMENT ONCE AN UPPER AIR DISTURBANCE OVER IOWA THIS MORNING MOVES OVER SOUTHERN INDIANA BY THIS EVENING. SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND EVENING. TUCEK
The office that day
Everything else NWS Indianapolis, IN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:12 PM EST | Flash Flood Warning | IND | Fountain, Vermillion, Warren | 3 hr |
| May 19, 7:12 PM EST | Flash Flood Warning | IND | Parke | 3 hr |
| May 19, 7:45 PM EST | Severe Thunderstorm Warning | IND | Clay | 45 min |
| May 19, 9:31 PM EST | Severe Thunderstorm Warning | IND | Sullivan, Vigo | 34 min |
| May 19, 10:27 PM EST | Severe Thunderstorm Warning | IND | Knox | 33 min |
| May 20, 1:56 PM EST | Severe Thunderstorm Warning | IND | Daviess | 49 min |
Nearby
Severe Thunderstorm Warnings in Indiana, 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.