Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 65, NWS Lincoln, IL

July 31, 1986Moultrie County, Shelby County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 31, 1986, 5:35 AM CDT for Moultrie County, Shelby County, Illinois. It was in force for 40 min. 2 reports 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 31, 1986, 5:35 AM CDT (10:35 UTC)
Expired
Jul 31, 1986, 6:15 AM CDT
In force
40 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Moultrie County, IL, Shelby 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 31, 5:38 AM CDTThunderstorm Wind 0Moultrie, IL
Jul 31, 5:40 AM CDTThunderstorm Wind 0Shelby, 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 00:00Z, 10.6 hours before the alert went out and 98 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 1986-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1925 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 1986-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 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
1925 J/kg
Mixed-layer CIN
-202 J/kg
Mixed-layer LCL
1112 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
130 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSPI 311035
SVRSPI
ILC173-139-311115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD IL
535 AM CDT THU JUL 31 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 615 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

CENTRAL ILLINOIS...SHELBY AND MOULTRIE

AT 530AM SEVERE THUNDERSTORMS WAS INDECATED FROM 15 MILES SOUTHEAST
OF DECATUR TO 30 MILES SOUTH OF DECATUR. THIS LINE OF SEVERE
SEVERE THUNDERSTORMS WAS MOVING SOUTHEAST AT 35 MILES AN HOUR.
THIS LINE OF THUNDERSTORMS HAS BEEN PRODUCING VERY STRONG GUSTY
WINDS AND LARGE HAIL

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 OFY
SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

 ATTN ISP DIST..10

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 31, 2:35 AM CDT, 3 hours before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
235 AM CDT THU JUL 31 1986

THE SEVERE THUNDERSTORM WARNINGS FROM PEORIA FOR MCDONOUGH
AND SCHULER COUNTIES ARE IN ERROR.

THE WARNINGS ARE FOR FULTON AND PEORIA, BUT WE ARE HAVING
COMMUNICATION PROBLEMS.

GEER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 1:36 AM CDTSevere Thunderstorm WarningILXFulton, Peoria69 min
Jul 31, 2:53 AM CDTSevere Thunderstorm WarningILXFulton, Peoria22 min
Jul 31, 3:17 AM CDTSevere Thunderstorm WarningILXMacon, Moultrie, Piatt58 min
Jul 31, 3:17 AM CDTSevere Thunderstorm WarningILXDouglas58 min
Jul 31, 4:11 AM CDTSevere Thunderstorm WarningILXSangamon19 min
Jul 31, 4:36 AM CDTSevere Thunderstorm WarningILXSangamon24 min
Jul 31, 4:53 AM CDTSevere Thunderstorm WarningILXChristian52 min
Jul 31, 5:15 AM CDTSevere Thunderstorm WarningILXMacon45 min
Jul 31, 5:49 AM CDTSevere Thunderstorm WarningILXColes, Cumberland41 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.