Alert archive / Indiana / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 5, NWS Indianapolis, IN

April 11, 1987Warren County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Apr 11, 1987, 5:37 PM EST for Warren County, Indiana. It was in force for 38 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 11, 1987, 5:37 PM EST (22:37 UTC)
Expired
Apr 11, 1987, 6:15 PM EST
In force
38 min
Issued by
NWS Indianapolis, IN
Area
Whole counties

County Warren County, IN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Apr 11, 5:50 PM ESTThunderstorm Wind 0Warren, 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

Peoria Regional, IL (KPIA), launched 12:00Z, 10.6 hours before the alert went out and 193 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, Peoria Regional, IL at 12:00Z on 1987-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Peoria Regional, IL at 12:00Z on 1987-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1952 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
116 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 112239
SVRIND
INC171-112315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
537 PM EST SAT APR 11 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 615 PM EST FOR PEOPLE IN THE FOLLOWING
COUNTY OF

WEST CENTRAL INDIANA...WARREN

AT 530 PM EST...RADAR SHOWED DANGEROUS THUNDERSTORMS 10 MILES AND
20 MILES WEST OF WILLIAMSPORT. WILLIAMSPORT IS 20 MILES SOUTHWEST
OF LAFAYETTE.

THE STORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR.

THESE STORMS CAN ALSO PRODUCE A SMALL TORNADO WITH LITTLE OR NO
ADVANCE WARNING.
.
A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS OF
60 MILES AN HOUR...LVARGE HAIL AND FREQUENT LIGHTNING.
STEIGERWALDT

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 11, 6:17 PM ESTSevere Thunderstorm WarningINDFountain, Warren33 min

Nearby

Severe Thunderstorm Warnings in Indiana, 1987Every severe thunderstorm warning in 1987

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.