Alert archive / Illinois / Tornado Warnings in 1986

Tornado Warning 18, NWS Lincoln, IL

September 29, 1986McLean County, Illinois

NWS Lincoln, IL issued this tornado warning at Sep 29, 1986, 4:22 PM CDT for McLean County, Illinois. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Sep 29, 1986, 4:22 PM CDT (21:22 UTC)
Expired
Sep 29, 1986, 5:10 PM CDT
In force
48 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County McLean 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, 9.4 hours before the alert went out and 67 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 1986-09-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1108 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 1986-09-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 square meters per square second.19395878Sfc1 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
1108 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
965 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.6
Supercell composite
2.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPIA 292133 COR
TORPIA
ILC113-292230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
TORNADO WARNING ...CORRECTION
NATIONAL WEATHER SERVICE PEORIA IL
422 PM CDT MON SEP 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 530 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

CENTRAL ILLINOIS...CENTRAL AND EASTERN MCLEAN

AT 315 PM CDT THE PUBLIC REPORTED A TORNADO OVER DANVERS ILLINOIS
OR 15 MILES NORTHWEST OF BLOOMINGTON.

RADAR IDICATES A HEAVY THUNDERSTORM 10 MILES NORTHWEST OF
BLOOMINGTON MOVING NORTHEAST AT 30 MPH.

COMMUNITIES WHICH MAY BE IN THE DIRECT THE PATH OF THIS STORM
ARE BLOOMINGTON...CARLOCK...HUDSON AND TOWANDA.
 IF YOU ARE IN THE PATH OF THIS TORNADO...YOU SHOULD GO TO A
BASEMENT SHELTER IF AVAILABLE.  OTHERWISE GO TO A CENTRAL INTERIOR
ROOM ON THE LOWEST FLOOR POSSIBLE.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING.

ATTN ISP 6

STUMETZ

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 29, 5:09 PM CDTSevere Thunderstorm WarningILXMontgomery51 min

Nearby

Tornado Warnings in Illinois, 1986Every tornado warning in 1986Tornadoes 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.