Alert archive / Indiana / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 49, NWS Indianapolis, IN

April 30, 1991Tippecanoe County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Apr 30, 1991, 9:55 PM EST for Tippecanoe County, Indiana. It was in force for 35 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 30, 1991, 9:55 PM EST (02:55 UTC)
Expired
Apr 30, 1991, 10:30 PM EST
In force
35 min
Issued by
NWS Indianapolis, IN
Area
Whole counties

County Tippecanoe County, IN

What was reported inside it

TimeReportWhereRemark
Apr 30, 10:15 PM ESTHail 0.88Tippecanoe, IN

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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Dayton/James M C, OH (KDAY), launched 00:00Z, 2.9 hours before the alert went out and 235 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.

Skew-T log-pSkew-T log-p diagram, Dayton/James M C, OH at 00:00Z on 1991-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 131 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dayton/James M C, OH at 00:00Z on 1991-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
131 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
2399 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KIND 010259 COR
SVRIND
INC157-010330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED...CORRECTION
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
955 PM EST TUE APR 30 1991

THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1030 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION......

IN WEST CENTRAL INDIANA

   ...TIPPECANOE COUNTY

AT 945 PM EST INDIANA STATE POLICE REPORTED NICKEL SIZE HAIL IN THE TOWN
OF ATICA IN NORTHERN FOUNTAIN COUNTY...WHICH IS 20 MILES SOUTHWEST OF
LAFAYETTE.

AT 950 PM EST RADAR SHOWED THIS THUNDERSTORM MOVING NORTHEAST AT 40 MILE
AN HOUR TOWARD LAFAYETTE.

PERSONS IN THE AREA AROUND LAFAYETTE SHOULD PREPARE FOR LARGE HAIL AND
STRONG WINDS BY SEEKING SHELTER IN A STRONG BUILDING AWAY FROM WINDOW.


IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

WJG
CORRECTION FOR LINE OVER PRINT

The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 10:35 PM ESTSevere Thunderstorm WarningINDCass, Miami25 min

Nearby

Severe Thunderstorm Warnings in Indiana, 1991Every severe thunderstorm warning in 1991

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.