Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 21, 1987, 7:12 PM CDT for Adams County, Brown County, Illinois. It was in force for 48 min.
The area
The counties it named.
The facts
- Issued
- May 21, 1987, 7:12 PM CDT (00:12 UTC)
- Expired
- May 21, 1987, 8:00 PM CDT
- In force
- 48 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Adams County, IL, Brown 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, 0.2 hours before the alert went out and 139 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
- 2351 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1819 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 98 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 KSTL 220012 SVRSTL ILC001-009-220100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 712 PM CDT THU MAY 21 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 800 PM CDT FOR THE FOLLOWING COUNTIES OF WEST CENTRAL ILLINOIS... ADAMS... BROWN A SEVERE THUNDERSTORM WAS REPORTED NEAR QUINCY IL AT 7PM CDT THIS EVENING. THIS STORM WAS MOVING TO THE EAST AT 30 MPH. GOLF BALL SIZE HAIL WASA REPORTED WITH THIS STORM. 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 STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH ...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON T HE LOWEST FLOOR OF YOUR HOME OR BUSINESS. DJ
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 21, 4:09 PM CDT, 3 hours 3 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA MO 405 PM CDT THU MAY 21 1987 ...STRONG THUNDERSTORMS APPROACHING THE LAKE OF THE OZARKS... AT 400 PM RADAR INDICATED STRONG THUNDERSTORMS MOVING THROUGH SOUTH PORTIONS OF CENTRAL MISSOURI. ONE WAS 10 MILES SOUTHWEST OF CAMDENTON AND ANOTHER WAS 10 TO 15 MILES NORTHWEST OF WAYNESVILLE. THEY WERE MOVING NORTHEAST AT 30 MILES AN HOUR. THESE THUNDERSTORMS WILL DROP VERY HEAVY RAIN. SM1ALL HAIL AND GUSTY WIND IS ALSO LIKELY. THE THUNDERSTORMS WILL PASS OVER SOUTH AND EAST PORTIONS OF THE LAKE OF THE OZARKS BY 430 PM. THE OTHER THUNDERSTORMS WILL PASS JUST NORTHWEST OF VIENNA. VOTAW
Special weather statement, May 21, 5:12 PM CDT, 2 hours before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 510 PM CDT THU MAY 21 1987 ...THUNDERSTORMS MOVING THROUGH ROLLA SALEM AREAS IN EAST CENTRAL MISSOURI. AT 505 PM A BAND OF THUNDERSTORMS CAPABLE OF STRONG GUSTY WINDS AND HEAVY RAINS ARE MOVING THROUGH PHELPS AND DENT COUNTIES INCLUDING THE TOWNS OF ROLLA EDGAR SPRINGS AND SALEM. THE STORMS ARE MOVING NORTHEAST AT 35 MPH AND WILL MOVE INTO CRAWFORD MARIES AND GASCONADE COUNTIES pBETWEEN 5 AND 630 PM. PERSONS SHOULD BE ALERT FOR THE STORMS AND REPORT ANY HAIL DAMAGING WINDS AND FLASH FLOODING TO THE LOCAL POLICE FOR RELAY TO THE NATIONAL WEATHER SERVICE. HAMILTON
Special weather statement, May 21, 5:15 PM CDT, 1 hour 57 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA MO 515 PM CDT THU MAY 21 1987 ...TORNADO WATCH FOR CENTRAL MISSOURI UNTIL 1000 PM... AT 505 PM VERY STRONG THUNDERSTORMS CONTINUED OVER SOUTH PORTIONS OF CENTRAL MISSOURI...ESPECIALLY SOUTH OF A LINE FROM POMME DE TERRE RESERVIOR TO BAGNELL DAM AT THE LAKE OF THE OZARKS AND OWENSVILLE. ANOTHER THUNDERSTORM WAS BUILDING OVER CENTRALIA. THESE THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MwILES AN HOUR. SMALL HAIL AND GUSTY WIND IS POSSIBLE WITH ANY OF THESE THUNDERSTORMS AS WELL AS VERY HEAVY RAIN. THE LARGEST THUNDERSTORM COMPLEX WAS 10 MILES WIDE AND LOCATED FROM ROLLA TO 20 MILES SOUTH OF WAYNESVILLE. VOTAW
Special weather statement, May 21, 5:47 PM CDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 540 PM CDT THU MAY 21 1987 ...THUNDERSTORMS WITH HAIL REPORTED AT CUBA MISSOURI IN EAST CENTRAL MISSOURI. ...TORNADO WATCH CONTINUES IN NORTHEAST AND EAST CENTRAL MISSOURI UNTIL 11 PM TUESDAY NIGHT... AT 530 PM RADAR INDICATED AN INTENSE THUNDERSTORM IN CRAWFORD COUNTY MOVING NORTHEAST AT 35 MPH. THIS STORM HAS A HISTORY OF HAIL WITH MARBLE SIZE HAIL REPORTED AT CUBA AND STRONG GUSTY WINDS. HAIL TO 1/2 INCH WAS REPORTED WITH THIS STORM EARLIER. PERSONS IN CRAWFORD COUNTY..GASCONADE AND FRANKLIN COUNTIES SHOULD REMAIN ALERT FOR STORMS CAPABLE OF PRODUCING HAIL STRONG GUSTY WINDS AND HEAVY RAINS BETWEEN 540 AND 7 PM THIS THURSDAY EVENING. TOWNS IN THE PATH OF THE STORM ARE SULLIVAN..BOURBON..SPRING BLUFF AND THE MERAMEC STATE PARK AREA. HAMILTON
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:01 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair | 59 min |
| May 21, 7:25 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Pike, Scott | 50 min |
| May 21, 7:25 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 50 min |
| May 21, 8:10 PM CDT | Severe Thunderstorm Warning | LSX | Brown, Pike | 50 min |
| May 21, 8:10 PM CDT | Severe Thunderstorm Warning | LSX | Scott | 50 min |
| May 21, 8:57 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Scott | 53 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.