Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 45, NWS Lincoln, IL

July 10, 1986Menard County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 10, 1986, 7:57 PM CDT for Menard County, Illinois. It was in force for 63 min.

The area

The counties it named.

The facts

Issued
Jul 10, 1986, 7:57 PM CDT (00:57 UTC)
Expired
Jul 10, 1986, 9:00 PM CDT
In force
63 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Menard 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 00:00Z, 1.0 hours before the alert went out and 172 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 00:00Z on 1986-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 933 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 00:00Z on 1986-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
933 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
1223 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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 KSPI 110057
SVRSPI
ILC017-137-129-110200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD IL
757 PM CDT THU JUL 10 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

CENTRAL ILLINOIS...CASS...MORGAN AND MENARD

AT 747PM CDT SEVERE THUNDERSTORMS WERE INDICATED BY RADAR FROM
35 MILES NORTHWEST OF SPRINGFIELD ILLINOIS NEAR VIRGINIA ILLINOIS
TO 45 MILES WEST OF SPRINGFIELD ILLINOIS NEAR BLUFFS ILLINOIS.
THE SEVERE THUNDERSTORMS WERE MOVING EAST AT 30 MPH.

LOCAL FLOODING REPORTED IN MENARD COUNTY NEAR PETERSBURG ILLINOIS
BY THE PUBLIC AT 750 PM CDT.

REMEMBER..A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS
OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING AND HEAVY RAINS THAT CAN
QUICKLY FLOOD A LOW LYING AREA.

IF THREATENING WEATHER APPROACHES...YOU SHOULD GO TO A S4AFE PLACE.
ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT OF
SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

 ATTN ISP DIST..9
 HUGHES

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 10, 4:44 PM CDT, 3 hours 13 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
435 PM CDT THU JUL 10 1986

.....THUNDERSTORMS IN CENTRAL ILLINOIS...

AT 430PM A LINE OF THUNDERSTORMS EXTENDED FROM LA SALLE COUNTY
TO ADAMS COUNTIES IN ILLINOIS.  THE STRONG THUNDERSTORMS WERE
LOCATED ABOUT 20 MILES NORTH OF PEORIA...20 MILES WEST OF PEORIA
IN THE FARMINGTON AREA...ANOTHER 25 SOUTHWEST OF PEORIA FROM
CANTON TO TO 5 MILES NORTH OF RUSHVILLE.

AT 435 MARBLE SIZE HAIL WAS REPORTED AT VERMONT IN FULTON CO.
AND AT PRINCEVILLE IN NORTHERN PEORIA CO.

BY 530 PM THE LINE OF THUNDERSTORMS WILL EXTEND FROM AROUND JOLIET
TO 10 MILES SOUTH OF PEORIA TO QUINCY ILLINOIS.

THESE THUNDERSTORMS WERE MOVING TO THE EAST AT AB?OUT 30 MPH.
GEER

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 10, 7:35 PM CDTSevere Thunderstorm WarningILXDeWitt, Macon55 min
Jul 10, 7:57 PM CDTSevere Thunderstorm WarningILXCass, Morgan63 min
Jul 10, 8:01 PM CDTSevere Thunderstorm WarningILXPiatt59 min
Jul 10, 8:09 PM CDTTornado WarningILXDeWitt, Piatt21 min
Jul 10, 8:17 PM CDTSevere Thunderstorm WarningILXSangamon58 min
Jul 10, 8:45 PM CDTTornado WarningILXChampaign30 min
Jul 10, 8:55 PM CDTTornado WarningILXMacon35 min
Jul 10, 9:05 PM CDTTornado WarningILXDouglas, Edgar, Vermilion25 min
Jul 10, 9:50 PM CDTTornado WarningILXChampaign25 min
Jul 11, 2:59 PM CDTSevere Thunderstorm WarningILXEdgar, Vermilion61 min

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.