Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 50, NWS Lincoln, IL

July 19, 1986Boone County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 19, 1986, 6:41 PM CDT for Boone County, Illinois. It was in force for 54 min.

The area

The counties it named.

The facts

Issued
Jul 19, 1986, 6:41 PM CDT (23:41 UTC)
Expired
Jul 19, 1986, 7:35 PM CDT
In force
54 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Boone 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, 11.7 hours before the alert went out and 195 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 1986-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 754 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 1986-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 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
754 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
1522 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
68 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 KRFD 192341
SVRRFD
ILC203-007-200045-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCKFORD IL
641 PM CDT SAT JUL 19 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 745 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

NORTH CENTRAL ILLINOIS...NORTHEAST WINNEBAGO AND NORTH AND CENTRAL 
 BOONE

 AT 640 PM CDT GOLF BALL SIZE HAIL REPORTED NEAR ROCKTON ILLINOIS.
 THATS ABOUT 14 NORTH OF ROCKFORD.. MOVEMENT WAS EAST AT 30 MPH.

 SOME COMMUNITIES WILL BE AFFECTED BY THIS SEVERE THUNDERSTORM...
 ROCKTON.. HUNTER.. CALEDONIA.. CAPRON.. BLAIN..

 A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS OF 60 MPH OR
 OR GREATER.. LARGE HAIL.. DANGEROUS LIGHTNING AND HEAVY RAIN THAT
 CAN QUICKLY FLOOD A LOW LYING AREA.

 SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES.  SO BE ALERT!  IF A
 TORNADO IS SIGHTED OR A TORNADO WARNING IS ISSUED.. TAKE SHELTER
 IN A BASEMENT OR REINFORCED BUILDING IMMEDIATELY!

 ATTN:ISP DIST 16
 PIERCE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 6:41 PM CDTSevere Thunderstorm WarningILXWinnebago39 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.