Alert archive / Illinois / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 86, NWS Indianapolis, IN

July 6, 1987Clay County, Wayne County, Illinois

NWS Indianapolis, IN issued this severe thunderstorm warning at Jul 6, 1987, 1:44 PM CDT for Clay County, Wayne County, Illinois. 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
Jul 6, 1987, 1:44 PM CDT (18:44 UTC)
Expired
Jul 6, 1987, 2:30 PM CDT
In force
46 min
Issued by
NWS Indianapolis, IN
Area
Whole counties

Counties Clay County, IL, Wayne County, IL

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
Jul 6, 2:15 PM CDTThunderstorm Wind 0Wayne, IL

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

Salem-Leckrone, IL (KSLO), launched 12:00Z, 6.7 hours before the alert went out and 39 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, Salem-Leckrone, IL at 12:00Z on 1987-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2811 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, Salem-Leckrone, IL at 12:00Z on 1987-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 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
2811 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
724 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
1.7
Supercell composite
8.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KEVV 061844
SVREVV
ILC191-025-061930-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EVANSVILLE IN
144 PM CDT MON JUL 6 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 230 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTHEAST ILLINOIS...WAYNE AND CLAY

AT 140 PM CDT A STRONG THUNDERSTORM WAS MOVING EAST ALONG I-64 WITH
HAIL...STRONG WINDS AND HEAVY RAIN.

IF YOU ARE IN AN AREA THREATENED BY THE STORM..GO TO A REINFORECED
SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL...VERY HEAVY
RAIN AND LIGHTNING.

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, Jul 6, 12:15 PM CDT, 1 hour 29 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS INDIANA
1215 PM EST MON JUL 6 1987

...THERE IS A SEVERE THUNDERSTORM WATCH FOR SOUTHERN INDIANA UNTIL
   500 PM EST...

THE WATCH IS SOUT OF A LINE FROM 10 MILES NORTH OF VINCENNES TO 45
MILES NORTHEAST OF LOUISVILLE. DANGEROUS LIGHTNING...LARGE HAIL AND
DAMAGING WINDS ARE POSSIBLE IN AND CLOSE TO THE WATCH AREA. HEAVY
RAINFALL IS ALSO POSSIBLE.

AT 1205 PM...THUNDERSTORMS WERE OVER SOUTHWEST INDIANA FROM AROUND
WESTPHALIA...OR 15 MILES NORTHEAST OF VINCENNES...TO JUST WEST OF
BEDFORD. THE STORMS WERE MOVING SLOWLY EAST.

THE STORMS WERE SOME OF THE AREA THAT RECEIVED HEAVY RAINFALL LATE
SATURDAY AFTERNOON. HEAVY RAINFWALL IS POSSIBLE THIS AFTERNOON AND
THAT COULD LEAD TO FLOODING OF LOW AND FLOOD PRONE AREAS. BE ALERT
FOR HEAVY RAINFALL.
Special weather statement, Jul 6, 12:24 PM CDT, 1 hour 20 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS INDIANA
1215 PM EST MON JUL 6 1987

...THERE IS A SEVERE THUNDERSTORM WATCH FOR SOUTHERN INDIANA UNTIL
   500 PM EST...

THE WATCH IS SOUTH OF A LINE FROM 10 MILES NORTH OF VINCENNES TO 45
MILES NORTHEAST OF LOUISVILLE. DANGEROUS LIGHTNING...LARGE HAIL AND
DAMAGING WINDS ARE POSSIBLE IN AND CLOSE TO THE WATCH AREA. HEAVY
RAINFALL IS ALSO POSSIBLE.

AT 1205 PM...THUNDERSTORMS WERE OVER SOUTHWEST INDIANA FROM AROUND
WESTPHALIA...OR 15 MILES NORTHEAST OF VINCENNES...TO JUST WEST OF
BEDFORD. THE STORMS WERE MOVING SLOWLY EAST.

THE STORMS WERE OVER SOME OF THE AREA THAT RECEIVED HEAVY RAINFALL
LATE SATURDAY AFTERNOON. H]EAVY RAINFALL IS POSSIBLE THIS AFTERNOON AND
THAT COULD LEAD TO FLOODING OF LOW AND FLOOD PRONE AREAS. BE ALERT
FOR HEAVY RAINFALL.

DS
Special weather statement, Jul 6, 1:21 PM CDT, 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS INDIANA
120 PM EST MON JUL 6 1987

...THERE IS A SEVERE THUNDERSTORM WATCH FOR SOUTHERN INDIANA UNTIL
   500 PM EST...

THE WATCH IS SOUTH OF A LINE FROM 10 MILES NORTH OF VINCENNES TO 45
MILES NORTHEAST OF LOUISVILLE. DANGEROUS LIGHTNING...LARGE HAIL AND
DAMAGING WINDS ARE POSSIBLE IN AND CLOSE TO THE WATCH AREA. HEAVY
RAINFALL IS ALSO POSSIBLE.

AT 115 PM...THUNDERSTORMS WERE OVER SOUTHWEST INDIANA FROM AROUND
THE ILLINOIS STATE LINE NEAR WESTPHALIA...TO 10 MILES WEST OF BEDFORD
NEAR NEWBERRY AND ODON.

STORMS WERE OVER SOME OF THE AREA THAT RECEIVED HEAVY RAINFALL
LATE SATURDAY AFTERNOON. HEAVY RAINFALL IS POSSIBLE THIS AFTERNOON AND
COULD LEAD TO FLOODING OF LOW AND FLOOD PRONE AREAS.

KENYON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 2:13 PM CDTSevere Thunderstorm WarningINDEdwards, Richland32 min
Jul 6, 2:23 PM CDTSevere Thunderstorm WarningINDLawrence, Wabash37 min

Nearby

Severe Thunderstorm Warnings in Illinois, 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.