Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 62, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 20, 1987, 8:18 PM CDT for Adams County, Illinois. It was in force for 27 min.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1987, 8:18 PM CDT (01:18 UTC)
- Expired
- Aug 20, 1987, 8:45 PM CDT
- In force
- 27 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Adams 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, 1.3 hours before the alert went out and 154 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
- 1095 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 1543 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 6.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 210117 SVRSTL ILC001-210145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 818 PM CDT THU AUG 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 845 PM CDT FOR THE FOLLOWING COUNTY OF WEST CENTRAL ILLINOIS... SOUTHWESTERN ADAMS AT 815 PM CDT RADAR INDICATEED A SEVERE THUDNERSTORM WAS MOVING INTO SOUTHWEST ADAMS COUNTY INCLUDING THE QUINCY AREA. PROTECT YOURSELF FROM DAMAGING WINDS...LARGE HAIL AND LIGHTNING BY STAYING IN A BUILDING...AWAY FROM WINDOWS. DO NOT USE THE TELEPHONE OR ELECTRICAL APPLIANCES...EXCEPT IN EMERGENCIES. HEAVY RAINS REDUCE VISIBILITY AND QUICKLY FLOOD ROADES AND LOW LYING AREAS. MOTORISTS SHOULD BE ALERT. DO NOT WALK OR DRIVE THROUGH FLOODED AREAS. STAY AWAY FROM STORM DRAINS. SLAUGHTER
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
Local storm report, Aug 20, 7:39 PM CDT, 39 minutes before
STORM REPORT NATIONAL WEATHER SERVICE ST LOUIS MO 735 PM CDT THU AUG 20 1987 THE FOLLOWING REPORTS WERE RECIEVED BY THE NATIONAL WEATHER SERVICE...ST LOUIS MO. 720 PM CDT...70 MPH WIND 2 MILES NORTH O&F KIRKSVILLE...KTVO TV... LIGHTNING..HEAVY RAIN..NO HAIL. 733 PM CDT...GOLF BALL SIZE HAIL AT KIRX RADIO STATION IN KIRKSVILLE MISSOURI. SLAUGHTER
Special weather statement, Aug 20, 7:42 PM CDT, 36 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ST LOUIS MO 737 PM CDT THU AUG 20 1987 AT 730 PM CDT...NUMEROUS STRONG THUNDERSTORMS...SOME WITH HEAVY RAIN AND LARGE HAIL...CONTINUED OVER SOUTHEAST IOWA NORTHEAST MISSOURI AND SCATTERED RAINSHOWERS OVER WEST ILLINOIS. A STRONG THUNDERSTORM WITH HEAVY RAIN AND LARGE HAIL CONTINUED OVER NORTHEAST MISSOURI 5 MILES NORTH OF KIRKSVILLE MISSOURI. OTHER STRONG STORMS WAS LOCATED 5 MILES EAST OF EDINA MISSOURI. THIS ENTIRE AREA OF SHOWERS AND STORMS EXTENDED FROM KIRKSVILLE MISSOURI TO 20 MILES WEST OF PEORIA ILLINOIS. MOVEMENT OF THE SHOWERS AND STORMS WAS SOUTHEAST AT 35 MILES AN HOUR. REMEMBER...STRONG (WINDS AND SOME HAIL MAY ACCOMPANY THESE STORMS. DYE
Special weather statement, Aug 20, 8:11 PM CDT, 7 minutes before
SPECIAL WEATHER STATEMENT FOR NORTHEAST MISSOURI NATIONAL WEATHER SERVICE ST LOUIS MO 805 PM CDT THU AUG 20 1987 NUMEROUS TREES AND POWER LINES WERE REPORTED DOWN IN ADAIR...MOSTLY IN THE KIRKSVILLE AREAA. TRAVEL IN ADAIR COUNTY IS DANGEROUS AT THE PRESENT TIME. SOME BRIDGES WERE REPORTED UNDER WATER FROM FLASH FLOODING FROM THEST STORMS. THE FLASH FLOODING WILL REMAIN A THREAT UNTIL ABOUT 10 PM THIS EVENING.
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.