Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 8, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at May 20, 1987, 6:20 PM CDT for Peoria County, Illinois. It was in force for 35 min. 1 report 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
- May 20, 1987, 6:20 PM CDT (23:20 UTC)
- Expired
- May 20, 1987, 6:55 PM CDT
- In force
- 35 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
County Peoria 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 |
|---|---|---|---|
| May 20, 6:30 PM CDT | Thunderstorm Wind 0 | Peoria, 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, 11.3 hours before the alert went out and 19 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 202320 SVRPIA ILC143-210015- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PEORIA IL 620 PM CDT WED MAY 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 715 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL ILLINOIS...SOUTHWEST PEORIA AT 610 PM CDT RADAR AND SURFACE REPORTS INDACATED A SEVERE THUNDER- STORM ENTERING INTO SOUTHWESTERN PEORIA COUNTY. CITIES IN THE PATH OF THIS STORM ARE HANNA CITY AND KICKAPOO. THESE STORMS HAVE BEEN ACCOMPANIED BY STRONG WINDS IN EXCESS OF 50 MPH...HEAVY RAIN AND POSSIBLE HAIL. THESE STORMS WERE MOVING NORTH NORTHEAST AT 30 MPH. 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. WHENe INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES AND ELECTRICAL EQUIPMENT. ATTN ISP DOIST 8
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, 1 hour 34 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
Special weather statement, May 20, 5:33 PM CDT, 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SPRINGFIELD IL 530 PM CDT WED MAY 20 1987 ...STRONG THUNDERSTORMS CONTINUE OVER PARTS OF CENTRAL ILLINOIS... AT 525PM WIDELY SCATTERED STRONG THUNDERSTORMS WERE OCCURRING ACROSS CENTRAL ILLINOIS AND WERE CONTINUING TO DEVELOP. THE STRONGEST STORMS WERE LOCATED NEAR MASON CITY AND 10 MILES SOUTHEAST OF MACOMB AND JUST SOUTHWEST OF PANA ILLINOIS. THESE STORMS MAY BE ACCOMPANIED BY STRONG GUSTY WIINDS...HAIL...VERY HEAVY RAIN AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WERE MOVING NORTH AT 20 MPH. A SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT FOR A LARGE PART OF NORTH AND 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, 5:30 PM CDT | Severe Thunderstorm Warning | ILX | Stark | 60 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.