Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 80, NWS Lincoln, IL

September 28, 1986Stephenson County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Sep 28, 1986, 5:20 PM CDT for Stephenson County, Illinois. It was in force for 55 min.

The area

The counties it named.

The facts

Issued: Sep 28, 1986, 5:20 PM CDT (22:20 UTC)
Expired: Sep 28, 1986, 6:15 PM CDT
In force: 55 min
Issued by: NWS Lincoln, IL
Area: Whole counties

County Stephenson 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, 10.3 hours before the alert went out and 187 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: 2727 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 117 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 282220
SVRRFD
ILC177-282315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCKFORD IL
520 PM CDT SUN SEP 28 1986

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

NORTHWEST ILLINOIS...EXTREME STEPHENSON

 AT 510 PM CDT A SEVERE THUNDERSTORM WAS LOCATED 40 MILES NORTH
 WEST OF ROCKFORD IL NEAR LENA IN STEPHENSON COUNTY IL. TREE AND
 BUILDING DAMAGE HAS BEEN REPORTED WITH STORM.

 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.

 ATTN:ISP DIST 16
 DRAUS

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, Sep 28, 1:38 PM CDT, 3 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
135 PM CDT SUN SEP 28 1986

...THUNDERSTORMS DEVELOPING...

RADAR ONCE AGAIN INDICATES THUNDERSTORMS DEVELOPING OVER WEST
CENTRAL ILLINOIS.  THE SCATTERED AREA OF SHOWERS AND THUNDERSTORMS
EXTENDED FROM JUST WEST OF FARMINGTON... ABOUT 30 WEST OF PEORIA..
THROUGH MACOMB TO JUST EAST AND SOUTH OF QUINCY.

THE SHOWERS AND THUNDERSTORMS SHOULD MOVE TOWARD THE NORTHEAST AT
ABOUT 25 MILES AN HOUR.

STARK

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 4:39 PM CDT	Severe Thunderstorm Warning	ILX	Stark	66 min
Sep 28, 4:39 PM CDT	Severe Thunderstorm Warning	ILX	Putnam	51 min
Sep 28, 5:14 PM CDT	Severe Thunderstorm Warning	ILX	Boone, Winnebago	61 min
Sep 28, 6:00 PM CDT	Tornado Warning	ILX	Boone, Ogle, Winnebago	60 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.