Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 8, NWS Lincoln, IL

April 30, 1986Menard County, Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Apr 30, 1986, 7:32 PM CDT for Menard County, Sangamon County, Illinois. It was in force for 58 min.

The area

The counties it named.

The facts

Issued: Apr 30, 1986, 7:32 PM CDT (00:32 UTC)
Expired: Apr 30, 1986, 8:30 PM CDT
In force: 58 min
Issued by: NWS Lincoln, IL
Area: Whole counties

Counties Menard County, IL, Sangamon 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 00:00Z, 0.5 hours before the alert went out and 87 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 530 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 395 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSPI 010036
SVRSPI
ILC129-167-010130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD IL
732 PM CDT WED APR 30 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 830 PM CDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF

CENTRAL ILLINOIS...MENARD AND SANGAMON.

AT 732PM, A SEVERE THUNDERSTORM WAS LOCATED 20 MILE NORTHWEST
SPRINGFIELD ILLINOIS..NEAR PETERSBURG ILLINOIS. THE SEVERE
THUNDERSTORM WAS MOVING SOUTHEAST AT 30 MILES PER HOUR.

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 LYIN)G 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
HILLIARD

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, Apr 30, 6:03 PM CDT, 1 hour 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
555 PM CDT WED APR 30 1986

THE SEVERE THUNDERSTORM WARNING THAT WENT OUT OVER WEATHER WIRE
FOR THE ILLINOIS COUNTIES FOR COLES..EDGAR ANDc CLARK WAS SENT BY
MISTAKE. DISREGARD WARNINGS FOR COLES..EDGAR AND CLARK.

HILLIARD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:50 PM CDT	Severe Thunderstorm Warning	ILX	Logan	40 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1986 Every 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.