Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 42, NWS Lincoln, IL

July 10, 1986Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 10, 1986, 6:27 PM CDT for Sangamon County, Illinois. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Jul 10, 1986, 6:27 PM CDT (23:27 UTC)
Expired
Jul 10, 1986, 7:15 PM CDT
In force
48 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County 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

Salem-Leckrone, IL (KSLO), launched 12:00Z, 11.5 hours before the alert went out and 139 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 12:00Z on 1986-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 948 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 12:00Z on 1986-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 230 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
948 J/kg
Mixed-layer CIN
-158 J/kg
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
230 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 10, 4:44 PM CDT, 1 hour 43 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
435 PM CDT THU JUL 10 1986

.....THUNDERSTORMS IN CENTRAL ILLINOIS...

AT 430PM A LINE OF THUNDERSTORMS EXTENDED FROM LA SALLE COUNTY
TO ADAMS COUNTIES IN ILLINOIS.  THE STRONG THUNDERSTORMS WERE
LOCATED ABOUT 20 MILES NORTH OF PEORIA...20 MILES WEST OF PEORIA
IN THE FARMINGTON AREA...ANOTHER 25 SOUTHWEST OF PEORIA FROM
CANTON TO TO 5 MILES NORTH OF RUSHVILLE.

AT 435 MARBLE SIZE HAIL WAS REPORTED AT VERMONT IN FULTON CO.
AND AT PRINCEVILLE IN NORTHERN PEORIA CO.

BY 530 PM THE LINE OF THUNDERSTORMS WILL EXTEND FROM AROUND JOLIET
TO 10 MILES SOUTH OF PEORIA TO QUINCY ILLINOIS.

THESE THUNDERSTORMS WERE MOVING TO THE EAST AT AB?OUT 30 MPH.
GEER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 3:19 PM CDTSevere Thunderstorm WarningILXMontgomery56 min
Jul 10, 5:51 PM CDTSevere Thunderstorm WarningILXLogan, Menard54 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.