Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 7, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at May 20, 1987, 5:30 PM CDT for Stark County, Illinois. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- May 20, 1987, 5:30 PM CDT (22:30 UTC)
- Expired
- May 20, 1987, 6:30 PM CDT
- In force
- 60 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
County 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, 10.5 hours before the alert went out and 50 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
- 1840 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 690 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPIA 202230 SVRPIA ILC175-202330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PEORIA IL 530 PM CDT WED MAY 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 630 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL ILLINOIS...STARK AT 508 PM CDT A SEVERE THUNDERSTORM WAS OVER NORTHERN PEORIA COUNTY OVER PRINCEVILLE AND AT 525 PM CDT THIS STORM HAS MOVE INTO THE SOUTHERN PORTION OF STARK COUNTY. DAMAGING WINDS AND LARGE HAIL HAS BEEN REPORTED WITH THIS STORM. COMMUNITIES DIRECTELY IN THE PATH OF THIS STORM ARE DUNCAN AND WYOMING IN STARK COUNTY. IF YOU ARE IN AN AREA THREATENED BY THE STORM..GO TO A REINFORECED SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND LIGHTNING. INTENSE LIGHTNING IS REPORTED WITH THIS STORM. IF OUTDOORS... STAY AWAY FROM HIGH OBJECTS. MOVE INDOOR IF POSSIBLE. WHEN INDOORS...STAY AWAY FGROM WINDOWS AND DOORS AND AVOID USING TELEPHONES AND ELECTRICAL EQUIPMENT. ATTN ISP 8 STUMETZ
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, May 20, 4:46 PM CDT, 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SPRINGFIELD IL 445 PM CDT WED MAY 20 1987 ...STRONG THUNDERSTORMS DEVELOPING RAPIDLY ACROSS CENTRAL ILLINOIS... AT 440PM STRONG THUNDERSTORMS WERE SCATTERED ACROSS MUCH OF CENTRAL ILLINOIS AND WERE DEVELOPING RAPIDLY. THE STRONGEST STORMS WERE LOCATED 40 MILES WEST OF SPRINGFIELD ILLINOIS...NEAR MEREDOSIA AND BEARDSTOWN. THESE STORMS MAY BE ACCOMPANIED BY STRONG GUSTY WINDS...HAIL...VERY HEAVY RAIN AND DANGEROUS LIGHTNING. OTHER STRONG THUNDERSTORMS WERE DEVELOPING WEST AND NORTH OF PEORIA. THE THUNDERSTORMS WERE MOVING NORTH AT 20 MPH. A SEVERE THUNDERSTORM WATCH HAS JUST BEEN ISSUED FOR A LARGE PART OF CENTRAL ILLINOIS UNTIL 1000 PM CDT. HUGHES
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 9:44 AM CDT | Severe Thunderstorm Warning | ILX | Vermilion | 31 min |
| May 20, 6:20 PM CDT | Severe Thunderstorm Warning | ILX | Peoria | 35 min |
| May 20, 6:34 PM CDT | Tornado Warning | ILX | Woodford | 51 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.