Alert archive / Illinois / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 60, NWS Lincoln, IL

August 3, 1987Knox County, Stark County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 3, 1987, 3:52 PM CDT for Knox County, Stark County, Illinois. It was in force for 68 min.

The area

The counties it named.

The facts

Issued
Aug 3, 1987, 3:52 PM CDT (20:52 UTC)
Expired
Aug 3, 1987, 5:00 PM CDT
In force
68 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Knox County, IL, Stark 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, 8.9 hours before the alert went out and 51 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 1987-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1310 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 1987-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
1310 J/kg
Mixed-layer CIN
-140 J/kg
Mixed-layer LCL
1154 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
-24 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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, Aug 3, 3:29 PM CDT, 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
330 PM CDT MON AUG 3 1987

...STRONG THUNDERSTORMS IN CENTRAL ILLINOIS FROM GALESBURG
   TO 20 MILES EAST OF MOLINE...

AT 320 PM...RADAR INDICATED A 15 MILE WIDE BAND OF STRONG
THUNDERSTORMS OVER CENTRAL ILLINOIS FROM GALESBURG NORTH TO
20 MILES EAST OF MOLINE AND NORTHWARD.

THESE STRONG STORMS WERE MOVING EAST AT 35 MPH.

THE LINE OF STORMS WILL BE ENTERING WESTERN BUREAU COUNTY..STARK
COUNTY AND MOVING ACROSS KNOX COUNTY THROUGH 400 PM.

FREQUENT DANGEROUS LIGHTENING..LARGE HAIL..BRIEF GUSTY WINDS TO
50 MPH AND HEAVY RAIN WILL ACCOMPANY THESE STORMS.

PEOPLE IN THESE COUNTIES SHOULD TAKE SHELTER INSIDE A BUILDING

FOR SAFETY BEFORE THESE STORMS ADVANCE UPON YOU.

PALMER

ATTN ISP DISTS...7..8..AND 17

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 4:27 PM CDTSevere Thunderstorm WarningILXBoone, Winnebago48 min
Aug 3, 5:02 PM CDTSevere Thunderstorm WarningILXPeoria58 min
Aug 3, 5:19 PM CDTSevere Thunderstorm WarningILXTazewell, Woodford56 min
Aug 3, 5:19 PM CDTSevere Thunderstorm WarningILXMarshall, Putnam56 min
Aug 3, 5:42 PM CDTSevere Thunderstorm WarningILXHenderson, McDonough, Warren48 min
Aug 3, 5:42 PM CDTSevere Thunderstorm WarningILXHancock48 min
Aug 3, 6:35 PM CDTSevere Thunderstorm WarningILXMcDonough55 min
Aug 3, 6:55 PM CDTSevere Thunderstorm WarningILXMason, Tazewell65 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1987Every 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.