Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 52, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jul 30, 1987, 4:02 PM CDT for Randolph County, Illinois; Sainte Genevieve County, Missouri. It was in force for 28 min.
The area
The counties it named.
The facts
- Issued
- Jul 30, 1987, 4:02 PM CDT (21:02 UTC)
- Expired
- Jul 30, 1987, 4:30 PM CDT
- In force
- 28 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
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
Salem-Leckrone, IL (KSLO), launched 12:00Z, 9.0 hours before the alert went out and 123 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
- 2921 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 720 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 302053 SVRSTL ILC157-MOC186-302130- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 402 PM CDT THU JUL 30 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 430 PM CDT FOR THE FOLLOWING COUNTIES OF SOUTHWEST ILLINOIS... WESTERN RANDOLPH SOUTHEAST MISSOURI... EASTERN STE. GENEVIEVE AT 345 PM A SEVERE THUNDERSTORM PRODUCED DAMAGING WINDS NEAR PRAIRE DU ROCHER...ABOUT 50 MILES SOUTH OF ST LOUIS IN SOUTHWEST ILLINOIS. THE STORMS WERE MOVING TO THE SOUTH AT 25 MPH. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH ...LARGE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HAMILTON/BROWNING
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, Jul 30, 1:19 PM CDT, 2 hours 43 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 110 M CDT THU JUL 30 1987 ...HEAT INDEX ON THE RISE... HOT WEATHER CONTINUES OVER ALL OF MISSOURI THIS AFTERNOON. THE TEMPERATURE AT 1 PM WAS NEAR 100 IN THE EXTREME NORTHWEST. THE TEMPERATURE HAD REACHED 98 IN DOWNTOWN KANSAS CITY. TEMPERATURES IN EASTERN MISSOURI WERE IN THE MID 90S. HOWEVER...THE HEAT INDEX HAD REACHED 108 AT ST LOUIS INTERNATIONAL AIRPORT AND 109 AT SPIRIT OF ST LOUIS AIRPORT. THE HEAT INDEX WAS OVER 100 EVERYWHERE IN THE STATE. TEMPERATURES WILL CLIMB TO AROUND 100 IN KANSAS CITY AND TO 97 OR 98 IN ST LOUIS THIS AFTERNOON. THE HIGHER RELATIVE HUMIDITY IN ST LOUIS WILL GIVE ST LOUIS A HEAT INDEX OF NEAR 110. ISOLATED THUNDERSTORMS WILL BE OVER PORTIONS OF EASTERN MISSOURI THIS AFTERNOON BUT WILL OFFER LITTLE IF ANY RELIEF. PERSONS SHOULD AVOID PROLONGED PHYSICAL ACTIVITY DURING THIS PERIOD OF EXCESSIVE HEAT. PERSONS ADVERSELY AFFECTED BY THE HEAT SHOULD REMAIN INSIDE AN AIR CONDITIONED BUILDING THIS AFTERNOON. BE SURE TO CHECK ON ELDERLY OR INFIRM NEIGHBORS. TUCKER
Special weather statement, Jul 30, 3:51 PM CDT, 11 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 345 PM CDT THU JUL 30 1987 ...VERY STRONG THUNDERSTORMS MOVING THROUGH RANDOLPH COUNTY ILLINOIS... AT 340 PM CDT THUNDERSTORMS WERE LOCATED NEAR REDBUD AND EVANSVILLE ILLINOIS OR ABOUT 40 MILES SOUTH SOUTHEAST OF ST LOUIS. THESE STORMS WERE MOVING SOUTH AT 30 MPH AND WILL MOVE THROUGH WESTERN RANDOLPH COUNTY ILLINOIS AND STE GENEVIEVE COUNTY MISOURI BETWEEN 345 AND 445 PM. PE}RSONS IN AND NEAR THE TOWNS OF EVANSVILLE..SPARTA..STEELVILLE AND CHESTER IN ILLINOIS..ALSO IN MISSOURI THE TOWNS OF STE GENEVIEVE AND ST MARYS CAN ALL EXPECT VERY HEAVY RAINS WITH AND SOME HAIL AND STRONG GUSTY WINDS. HAMILTON
Nearby
Severe Thunderstorm Warnings in Illinois, 1987Severe Thunderstorm Warnings in Missouri, 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.