Alert archive / Illinois / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 34, NWS Lincoln, IL

June 29, 1987Vermilion County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 29, 1987, 3:04 PM CDT for Vermilion County, Illinois. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
Jun 29, 1987, 3:04 PM CDT (20:04 UTC)
Expired
Jun 29, 1987, 3:45 PM CDT
In force
41 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Vermilion 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, 8.1 hours before the alert went out and 167 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 1987-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 732 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 1987-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 218 square meters per square second.193958Sfc1 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
732 J/kg
Mixed-layer CIN
-189 J/kg
Mixed-layer LCL
1148 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
218 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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, Jun 29, 1:34 PM CDT, 1 hour 30 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
 135 PM CDT MON JUN 29 1987

...STRONG THUNDERSTORM SOUTH OF BLOOMINGTON ILLINOIS...

AT 130 PM CDT...RADAR INDICATED A STRONG THUNDERSTORM ABOUT
5 MILES SOUTH OF BLOOMINGTON IN NORTH CENTRAL ILLINOIS.

MC LEAN COUNTY EMERGENCY SERVICES REPORTED PEA SIZE HAIL WITH
THIS STORM.

THE THUNDERSTORM WAS MOVING EAST AT 40 MPH AND SHOULD REACH
GIBSON CITY IN FORD COUNTY BY AROUND 230 PM.

THIS STORM MAY PRODUCE LARGER HAIL AS IT MOVES EAST ACROSS MC LEAN
COUNTY.  ALSO EXPECT BRIEF STRONG GUSTY WIND TO 45 MPH..DANGEROUS
LIGHTNING AND BRIEF HEAVY RAIN.

 OTHER THUNDERSTORMS WERE 10 MILES WEST OF BLOOMINGTON AND
ON THE NORTH EDGE OF NORMAL ILLINOIS.  THESE ALSO WERE MOVING
EAST AT 40 MPH.

PALMER

ATTN ISP DISTS...6 AND 6A

                                                         N
Special weather statement, Jun 29, 1:42 PM CDT, 1 hour 22 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
 140 PM CDT MON JUN 29 1987

...STRONG THUNDERSTORM DEVELOPING RAPIDLY OVER WEST CENTRAL
   ILLINOIS...

AT 135 PM...RADAR INDICATED A NEWLY DEVELOPED STRONG THUNDERSTORM
IN NORTH CENTRAL SCHUYLER COUNTY ABOUT 15 MILES NORTH OF RUSHVILLE
ILLINOIS AND 25 MILES SOUTH OF MACOMB ILLINOIS.

THIS STRONG STORM WAS MOVING EAST AT 40 MPH AND WILL BE NEAR
ASTORIA AND HAVANA ILLINOIS BY AROUND 245 PM.

DANGEROUS LIGHTNING...PEA TO MARBLE SIZE HAIL...STRONG GUSTY WIND
AND BRIEF HEAVY RAIN WILL ACCOMPANY THIS STORM.

PALMER

 ATTN ISP DISTS9..14..AND 20

Q
Special weather statement, Jun 29, 2:40 PM CDT, 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
2 35 PM CDT MON JUN 29 1987

...STRONG THUNDERSTORMS DEVELOPING IN WESTERN ILLINOIS...

AT 2 30 PM CDT WEATHER RADARS SHOWS RAPIDLY DEVELOPING STRONG
THUNDERSTORMS IN WESTERN ILLINOIS FROM 25 MILES SOUTHWEST OF
SPRINGFIELD THEN NORTH TO NEAR MASON CITY ILLINOIS TO JUST SOUTH
OF WATSEKA ILLINOIS.

THE STRONGEST THUNDERSTORMS MAY PRODUCE...STRONG GUSTY WINDS...HAIL
...DANGEROUS LIGHTNING AND BRIEF HEAVY DOWNPOURS.

THE AREA OF THUNDERSTORMS WERE MOVING EAST AT 35 MPH.

HILLIARD                                                                     [ ]                                                                             [ ~]

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 2:43 PM CDTTornado WarningILXMcLean47 min
Jun 29, 4:47 PM CDTSevere Thunderstorm WarningILXChampaign, Vermilion43 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.