Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 37, NWS St. Louis, MO

July 12, 1986Perry County, Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 12, 1986, 1:22 PM CDT for Perry County, Randolph County, Illinois. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jul 12, 1986, 1:22 PM CDT (18:22 UTC)
Expired
Jul 12, 1986, 2:22 PM CDT
In force
60 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Perry County, IL, Randolph 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

Peoria Regional, IL (KPIA), launched 12:00Z, 6.4 hours before the alert went out and 289 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 1986-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1465 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, Peoria Regional, IL at 12:00Z on 1986-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 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
1465 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
566 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 121824
SVRSTL
ILC157-145-121915-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
122 PM CDT SAT JUL 12 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 222 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF
SOUTHERN ILLINOIS

EASTERN RANDOLPH PERRY



AT 122 PM CDT A SEVERE THUNDERSTORM WAS INDICATED BY RADAR JUST NORTH
OF CHESTER ILLINOIS.  THIS STORM WAS MOVING TO THE EAST AT 40 MPH AND
SHOULD REACH THE DU QUOIN AREA BY 215 THIS AFTERNOON.


<

REMEMBER A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WIND IN EXCESS
OF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAIN THAT CAN
QUICKLY FLOOD L)OW LYING AREAS.

PLEASE REPORT ANY SEVERE WEATHER TO YOUR NEAREST LAW ENFORCEMENT AGENCY
OR THE NATIONAL WEATHER SERVICE.

JOKERST

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 12, 1:07 PM CDT, 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
110 PM CDT SAT JUL 12 1986

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF SOUTHEAST
   MISSOURI AND PORTIONS OF SOUTHERN ILLINOIS UNTIL 7 PM THIS
   SATURDAY AFTERNOON...

AT 110 PM CDT..INTENSE THUNDERSTORMS..SOME WITH HEAVY RAIN.. WERE
LOCATED FROM NEAR NEW ATHENS ILLINOIS SOUTH TO CHESTER ILLINOIS THEN
WEST TO NEAR ROLLA MISSOURI.  THIS AREA WAS ABOUT 50 MILES SOUTHEAST AND
AND SOUTH OF ST LOUIS MO.

THESE THUNDERSTORMS WERE MOVING FROM THE WEST AT 35 TO 40 MPH.

STRONG GUSTY WIND..SMALL HAIL AND VERY HEAVY RAIN WILL ACCOMPANY
THESE THUNDERSTORMS AS THEY MOVE THROUGH SOUTHERN ILLINOIS AND
SOUTHEAST MISSOURI THIS AFTERNOON.

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 11, 7:05 PM CDTFlash Flood WarningLSXPerry4 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 1986Every severe thunderstorm warning in 1986

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.