Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 41, NWS Lincoln, IL

July 10, 1986Logan County, Menard County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 10, 1986, 5:51 PM CDT for Logan County, Menard County, Illinois. It was in force for 54 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 10, 1986, 5:51 PM CDT (22:51 UTC)
Expired
Jul 10, 1986, 6:45 PM CDT
In force
54 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Logan County, IL, Menard 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 10, 6:03 PM CDTHail 0.75Menard, 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, 10.9 hours before the alert went out and 169 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 1986-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 948 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 1986-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 230 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
948 J/kg
Mixed-layer CIN
-158 J/kg
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
230 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSPI 102251
SVRSPI
ILC129-107-102345-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 645 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

CENTRAL ILLINOIS...MENARD AND LOGAN

AT 548PM CDT A SEVERE THUNDERSTORM WAS INDICATED BY RADAR IN EASTERN
MENARD COUNTY NEAR GREENVIEW ILLINOIS..ABOUT 20 MILES NORTH
OF SPRINGFIELD ILLINOIS.
THE SEVERE THUNDERSTORM WAS MOVING EAST AT 25 MPH.

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 SAFE 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, 1 hour 7 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, 3:19 PM CDTSevere Thunderstorm WarningILXMontgomery56 min
Jul 10, 6:27 PM CDTSevere Thunderstorm WarningILXSangamon48 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.