Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 1, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Apr 11, 1987, 4:05 PM CDT for DeWitt County, Piatt County, Illinois. It was in force for 55 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 11, 1987, 4:05 PM CDT (21:05 UTC)
- Expired
- Apr 11, 1987, 5:00 PM CDT
- In force
- 55 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
Counties DeWitt County, IL, Piatt County, IL
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 11, 4:28 PM CDT | Tornado F1 | De Witt, IL | |
| Apr 11, 4:56 PM CDT | Tornado F1 | Piatt, IL |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Peoria Regional, IL (KPIA), launched 12:00Z, 9.1 hours before the alert went out and 97 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1952 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSPI 112110 COR SVRSPI ILC039-147-112200- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SPRINGFIELD IL 405 PM CDT SAT APR 11 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 500 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF CENTRAL ILLINOIS...DE-WITT AND NORTHERN PIATT AT 3 56 PM DE WITT COUNTY ESDA REPORTED THREE QUARTER INCH HAIL IN CLINTON ILLINOIS. RADAR INDICATED A STRONG THUNDERSTORM IN THE SAME AREA. THE THUNDERSTORM WAS MOVING EAST AT 25 MILES AN HOUR. REMEMBER...A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING AND HEAVY RAINS THAT CAN QUICKLY FLOOD A LOW LYING AREA. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING...SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED. IF THREATENING WEATHER APPROACHES^...YOU SHOULD GO TO A SAFE PLACE. ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE. ATTN ISP DIST...6 AND 10 GOODSELL
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, Apr 11, 3:07 PM CDT, 58 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PEORIA IL 305 PM CDT SAT APR 11 1987 A LINE OF HEAVY THUNDERSTORMS HAD DEVELOPED OVER NORTH CENTRAL ILLINOIS FROM MOLINE EXTENDING SOUTHEAST TO CANTON...AND WERE MOVING NORTHEAST AT 35 MPH. A FEW OF THESE THUNDERSTORMS COULD BE ACCOMPANIED WITH BRIEF PEROIDS OF HEAVY DOWNPOURS...SOME SMALL HAIL AND STRONG GUSTY SURFACE WINDS. AT 230 PM CDT SMALL HAIL WAS REPORTED IN THE GALESBURG AREA. ATTN4 ISP 6 8 17 STUMETZ
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 3:51 PM CDT | Tornado Warning | ILX | Peoria, Woodford | 69 min |
| Apr 11, 4:27 PM CDT | Tornado Warning | ILX | DeWitt, Logan | 33 min |
| Apr 11, 4:42 PM CDT | Tornado Warning | ILX | Macon, Piatt | 33 min |
| Apr 11, 4:42 PM CDT | Tornado Warning | ILX | Champaign | 33 min |
| Apr 11, 5:10 PM CDT | Tornado Warning | ILX | Champaign, Piatt | 35 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.