Alert archive / Illinois / Tornado Warnings in 1987
Tornado Warning 25, NWS Lincoln, IL
NWS Lincoln, IL issued this tornado warning at Aug 21, 1987, 6:24 AM CDT for Woodford County, Illinois. It was in force for 31 min.
The area
The counties it named.
The facts
- Issued
- Aug 21, 1987, 6:24 AM CDT (11:24 UTC)
- Expired
- Aug 21, 1987, 6:55 AM CDT
- In force
- 31 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
County Woodford 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 00:00Z, 11.4 hours before the alert went out and 35 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.
- Mixed-layer CAPE
- 1095 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 1543 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 6.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPIA 211124 RRA TORPIA ILC203-211230- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE PEORIA IL 624 AM CDT FRI AUG 21 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 730 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL ILLINOIS...WOODFORD AT 620 AM CDT SEVERAL PILOT REPORTS AND SURFACE REPORTS OF FUNNEL CLOUDS OVER NORTHWESTERN WOODFORD COUNTY. AT 600 AM A POSSIBLE TORNADO HIT PRINCEVILLE IL...20 MILES NORTHWEST OF PEORIA. THE FUNNEL CLOUDS ARE ASSOCIATED WITH A THUNDERSTORM MOVING RAPIDLY TO THE SOUTHEAST AT APPROXIMATELY 50 MPH. IF YOU ARE IN THE PATH OF THIS TORNADO...GO TO A BASEMENT SHELTER IF AVAILABLE...OTHERWISE TO A CENTRAL INTERIOR ROOM ON THE LOWEST FLOOR. ABANDON CARS AND MOBILE HOMES FOR A REINFORCED BUILDING. THIS IS A DANGEROUS STORM. TAKE COVER IMMEDIATELY. ATTN ISP DIST 8 LAST/MACH
What forecasters said that day
The local office's own words before this tornado 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 21, 3:00 AM CDT, 3 hours 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
300 AM CDT FRI AUG 21 1987
...STRONG THUNDERSTORMS MOVING INTO STARK COUNTY...
AT 255 AM CDT WEATHER SERVICE RADAR INDICATED AN AREA OF SHOWERS
AND STRONG THUNDERSTORMS EXTENDING NORTH OF A LINE FROM BLOOMINGTON
TO GALESBURG IL TO 20 MILES NORTH OF BURLINGTON IA. THE STRONGEST
THUNDERSTORMS WERE LOCATED IN SOUTHEAST HENRY COUNTY AND NEAR THE
CITY OF MOLINE.
THE STORM IN HENRY COUNTY WILL BE MOVING INTO STARK COUNTY BY 330 AM
AND WILL BE AFFECTING THE TOWNS OF TOULON AND WYOMING...30 MILES NORTH
OF PEORIA.
HEAVY RAIN...DANGEROUS LIGHTNING...AND STRONG GUSTY WINDS CAN BE
EXPECTED WITH THESE STORMS AS THEY MOVE THROUGH THE AREA. THE RAIN
AREA WAS MOVING TO THE SOUTHEAST AT 30 MPH.
JK LAST
ATTN ISP DIST...8Special weather statement, Aug 21, 3:40 AM CDT, 2 hours 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
340 AM CDT FRI AUG 21 1987
...STRONG THUNDERSTORMS NORTH AND WEST OF PEORIA...
AT 335 AM CDT NATIONAL WEATHER SERVICE RADAR INDICATED A LARGE AREA
OF SHOWERS AND STRONG THUNDERSTORMS NORTH OF A LINE FROM CHAMPAIGN
TO PEORIA IL TO 15 MILES EAST OF BURLINGTON IA. THE STRONGEST
THUNDERSTORMS WERE LOCATED IN NORTHERN KNOX COUNTY..10 MILES EAST
OF GALESBURG...AND IN SOUTHERN BUREAU COUNTY..NEAR TISKILWA WHICH
IS 45 MILES NORTH OF PEORIA.
THESE THUNDERSTORMS ARE MOVING TO THE SOUTHEAST AT 35 MPH AND WILL
BE AFFECTING THE COUNTIES OF PEORIA...STARK...AND BUREAU THROUGHOUT
THE EARLY MORNING HOURS.
HEAVY RAIN...DANGEROUS LIGHTNING...AND STRONG GUSTY WINDS CAN BE
EXPECTED WITH THESE STORMS AS THEY MOVE THROUGH THE AREA.
JK LAST
ATTN ISP DIST...7...8...17Special weather statement, Aug 21, 4:40 AM CDT, 1 hour 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
435 AM CDT FRI AUG 21 1987
...STRONG THUNDERSTORM OVER PEORIA...
AT 425 AM CDT NATIONAL WEATHER SERVICE RADAR INDICATED A VERY STRONG
THUNDERSTORM OVER PEORIA IL. A PEAK WIND GUST OF 45 MPH WAS RECORDED
HERE AT THE GREATER PEORIA AIRPORT AT 417 AM AND 0.40 INCHES OF RAIN
FELL IN 15 MINUTES. THIS THUNDERSTORM IS ENTERING NORTHERN TAZEWELL
COUNTY AND WILL BE AFFECTING THE TOWNS OF PEKIN...MORTON AND MACKINAW.
ANOTHER STRONG THUNDERSTORM WAS OVER WESTERN BUREAU COUNTY.
THE THUNDERSTORMS ARE MOVING TO THE SOUTHEAST AT 35 MPH.
HEAVY RAIN...DANGEROUS LIGHTNING...AND STRONG GUSTY WINDS CAN BE
EXPECTED WITH THESE STORM?S AS THEY MOVE THROUGH THE AREA.
JK LAST
ATTN ISP DIST...7...8...17Special weather statement, Aug 21, 6:01 AM CDT, 23 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PEORIA IL 600 AM CDT FRI AUG 21 1987 ...SEVERE THUNDERSTORM WARNING FOR KNOX...STARK...AND BUREAU COUNTIES CANCELLED... AT 550 AM CDT WEATHER SERVICE RADAR INDICATED A VERY STRONG THUNDERSTORM EXTENDING FROM SPRING VALLEY...45 MILES NORTHEAST OF PEORIA...TO PRINCEVILLE...15 MILES NORTHWEST OF PEORIA. THE STORM HAD MOVED OUT OF KNOX...STARK AND BUREAU COUNTIES AND HAD WEAKENED. THIS STORM WILL BE AFFECTING NORTHERN PEORIA...MARSHALL AND PUTNAM COUNTIES UNTIL 630 AM CDT. HEAVY RAIN...DANGEROUS LIGHTNING AND STRONG GUSTY WINDS CAN BE EXPECTED WITH THIS STORM AS IT MOVES SOUTHEAST AT 50 MPH. JKLAST ATTN ISP DIST... 8 AND 17
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 5:34 AM CDT | Severe Thunderstorm Warning | ILX | Bureau, Knox, Stark | 26 min |
Nearby
Tornado Warnings in Illinois, 1987Every tornado warning in 1987Tornadoes 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.