Alert archive / Illinois / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 44, NWS Lincoln, IL

July 6, 1987Coles County, Edgar County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 6, 1987, 6:55 PM CDT for Coles County, Edgar County, Illinois. It was in force for 45 min.

The area

The counties it named.

The facts

Issued: Jul 6, 1987, 6:55 PM CDT (23:55 UTC)
Expired: Jul 6, 1987, 7:40 PM CDT
In force: 45 min
Issued by: NWS Lincoln, IL
Area: Whole counties

Counties Coles County, IL, Edgar 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, 11.9 hours before the alert went out and 132 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: 2811 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 724 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 8.8

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 6, 4:14 PM CDT, 2 hours 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
410 PM CDT MON JUL 6 1987

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SCHUYLER AND MASON
COUNTIES OF WEST CENTRAL ILLINOIS UNTIL 900 PM TONIGHT...

AT 400 PM THIS AFTERNOON...NO SEVERE WEATHER HAS BEEN REPORTED IN
CENTRAL ILLINOIS.  HOWEVER...RADAR INDICATED A STRONG THUNDERSTORM
WEST OF BRADFORD IN EXTREME NORTHEAST STARK COUNTY.  BRADFORD IS
ABOUT 35 MILES NORTH OF PEORIA.  THIS THUNDERSTORM WAS MOVING EAST
AT 30 MPH.

RADAR ALSO INDICATED A LARGE AREA OF SHOWERS AND THUNDERSTORMS THAT
STRETCHED FROM SPRINGFIELD TO QUINCY TO ST. LOUIS.
THIS AREA WAS MOVING EAST...NORTHEAST AT 20 TO 25 MPH.

NADOLSKI

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Special weather statement, Jul 6, 6:26 PM CDT, 29 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 12:21 AM CDT	Tornado Warning	ILX	Clark, Cumberland	24 min
Jul 6, 1:52 PM CDT	Severe Thunderstorm Warning	ILX	Carroll	53 min
Jul 6, 2:21 PM CDT	Severe Thunderstorm Warning	ILX	Stephenson	54 min
Jul 6, 2:54 PM CDT	Severe Thunderstorm Warning	ILX	Winnebago	51 min
Jul 6, 3:13 PM CDT	Severe Thunderstorm Warning	ILX	Boone	17 min
Jul 6, 4:37 PM CDT	Severe Thunderstorm Warning	ILX	Macoupin	53 min
Jul 6, 4:45 PM CDT	Severe Thunderstorm Warning	ILX	Montgomery	60 min
Jul 6, 5:05 PM CDT	Tornado Warning	ILX	Knox, Peoria	55 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1987 Every severe thunderstorm warning in 1987

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.