Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 13, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 2, 1987, 2:05 PM CDT for Cook County, DuPage County, Will County, Illinois. It was in force for 55 min.
The area
The counties it named.
The facts
- Issued
- Jun 2, 1987, 2:05 PM CDT (19:05 UTC)
- Expired
- Jun 2, 1987, 3:00 PM CDT
- In force
- 55 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Cook County, IL, DuPage County, IL, Will 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, 7.1 hours before the alert went out and 185 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
- 920 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAAOO KCHI 021905 RRA
SVRCHI
ILC031-043-197-022000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHICAGO IL
205 PM CDT TUE JUN 2 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 300 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES:
IN NORTHEAST ILLINOIS
..SOUTHERN COOK..EXTREME SOUTHEASTERN DU PAGE..NORTHERN WILL
AT 2 08 PM A SEVERE THUNDERSTORM WAS LOCATED NEAR BOLLINGBROOK...35
MILES SOUTHWEST OF THE CHICAGO LOOP MOVING EAST NORTHEAST AT 30 MPH.
AT 2 PM CDT WINDS IN EXCESS OF 50 MPH WAS REPORTED AT PLAINFIELD
WHICH IS 40 MILES SOUTHWEST OF THE CHICAGO LOOP...OR 5 MILES
NORTHWEST OF JOLIET.
WHEN THUNDERSTORMS ARE OCCURRING, PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORHM
HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
ATTN ISP DISTRICTS 2 3 4 5 AND 15
MORRISONWhat 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 2, 11:45 AM CDT, 2 hours 20 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 11 45 AM CDT TUE JUN 2 1987 ...THUNDERSTORMS DEVELOPING ACROSS NORTH AND CENTRAL ILLINOIS... AT 11 40 AM RADAR INDICATED NUMEROUS VERY HEAVY THUNDERSTORMS DEVELOPING RAPIDLY OVER WESERN AND CENTRAL ILLINOIS. THESE THUNDERSTORMS WERE MOVING EAST NORTHEAST AT 25 MPH. THE HEAVIEST STORMNS ARE IN AN AREA FROM NEAR SPRINGFIELD TO NEAR PAXTON TO DANVILLE. AT 11 30 AM 1/4 INCH HAIL WAS REP5ORTED AT PAXTON ... 25 MILES NORTH NORTHEAST OF CHAMPAIGN. RESIDENTS OF SOUTHERN FORD AND SOUTHERN IROQUOIS COUNTY SHOULD BE ALERT FOR THE POSSIBILITY OF STRONG GUSTY WINDS AND HAIL THE NEXT 1 TO 2 HOURS. PURPURA
Special weather statement, Jun 2, 11:46 AM CDT, 2 hours 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 11 45 AM CDT TUE JUN 2 1987 ...THUNDERSTORMS DEVELOPING ACROSS NORTH AND CENTRAL ILLINOIS... AT 11 40 AM RADAR INDICATED NUMEROUS VERY HEAVY THUNDERSTORMS DEVELOPING RAPIDLY OVER WESERN AND CENTRAL ILLINOIS. THESE THUNDERSTORMS WERE MOVING EAST NORTHEAST AT 25 MPH. THE HEAVIEST STORMNS ARE IN AN AREA FROM NEAR SPRINGFIELD TO NEAR PAXTON TO DANVILLE. AT 11 30 AM 1/4 INCH HAIL WA9S REPORTED AT PAXTON ... 25 MILES NORTH NORTHEAST OF CHAMPAIGN. RESIDENTS OF SOUTHERN FORD AND SOUTHERN IROQUOIS COUNTY SHOULD BE ALERT FOR THE POSSIBILITY OF STRONG GUSTY WINDS AND HAIL THE NEXT 1 TO 2 HOURS. PURPURA
Special weather statement, Jun 2, 2:05 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 2 00 PM CDT TUE JUN 2 1987 ...SEVERE THUNDERSTORM WATCH IN EFFECT... THUMDERSTORMS CONTINUE TO INTENSIFY ACROSS NORTHEAST AND CENTRAL ILLINOIS...AND SEVERE THUNDERSTORM WATCH NUMBER 180 IS NOW IN EFFECT UNTIL 8 PM FOR THIS AREA. IN THE CHICAGO METROPOLITAN AREA...HEAVY THUNDERSTORMS ARE APPROACHING FROM THE WEST AND SOUTHWEST. AT 1 45 PM ESTIMATED WIND GUSTS OF 45 MILES PER HOUR...AND SMALL HAIL COVERING THE GROUND WERE REPORTED AT ALGONQUIN...45 MILES NORTHWEST OF DOWNTOWN CHICAGO. ANOTHER STRONG STORM WAS LOCATED 20 MILES NORTHWEST OF JOLIET...40 MILES SOUTHWEST OF DOWNTOWN CHICAGO. THESE STORMS WERE MOVING EAST NORTHEAST A9T 30 MILES PER HOUR. BETWEEN 2 AND 4 PM BE ALERT FOR THE POSSIBILITY OF LARGE HAIL AND POSSIBLY DAMAGING WINDS. PURPURA
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 12:12 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 48 min |
| Jun 2, 12:12 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 48 min |
| Jun 2, 2:38 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 67 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.