Alert archive / Illinois / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 20, NWS St. Louis, MO

June 16, 1987Perry County, Randolph County, Washington County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 16, 1987, 3:13 PM CDT for Perry County, Randolph County, Washington County, Illinois. It was in force for 47 min.

The area

The counties it named.

The facts

Issued
Jun 16, 1987, 3:13 PM CDT (20:13 UTC)
Expired
Jun 16, 1987, 4:00 PM CDT
In force
47 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Perry County, IL, Randolph County, IL, Washington County, IL

The radar

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

The nearest sounding before it

Salem-Leckrone, IL (KSLO), launched 12:00Z, 8.2 hours before the alert went out and 77 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 1987-06-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2929 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 1987-06-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939Sfc1 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
2929 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
1061 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
38 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 KSTL 162012
SVRSTL
ILC189-145-157-162100-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
313 PM CDT TUE JUN 16 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 400 PM CDT FOR THE FOLLOWING COUNTIES OF
 
SOUTHWEST ILLINOIS... SOUTHERN WASHINGTON... NORTHERN PERRY...
   NORTHEASTERN RANDOLPH
 
AT 305 PM THIS AFTERNOON RADIO STATION WEYL IN CENTRALIA REPORTED
GOLF BALL SIZE HAIL NEAR NASHVILLE ILLINOIS...OR ABOUT 30 MILES WEST
OF MT VERNON. THIS STORM WAS MOVING SLOWLY..SOUTHWEST AT 10 MILES AN
HOUR.
 
PROTECT YOURSELF FROM DAMAGING WINDS...LARGE HAIL AND LIGHTNING
BY STAYING IN A BUILDING...AWAY FROM WINDOWS.  DO NOT USE THE
TELEPHONE OR ELECTRICAL APPLIANCES...EXCEPT IN EMERGENCIES.
 
FELDT

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; the sounding from the Mesonet's radiosonde archive.