Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 41, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jul 6, 1987, 4:24 PM CDT for Calhoun County, Jersey County, Madison County, Illinois; Saint Charles County, Missouri. It was in force for 51 min. 3 reports 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
- Jul 6, 1987, 4:24 PM CDT (21:24 UTC)
- Expired
- Jul 6, 1987, 5:15 PM CDT
- In force
- 51 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Calhoun County, IL, Jersey County, IL, Madison County, IL, Saint Charles County, MO
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 |
|---|---|---|---|
| Jul 6, 4:25 PM CDT | Thunderstorm Wind 52 | Madison, IL | |
| Jul 6, 4:32 PM CDT | Hail 1 | St. Charles, MO | |
| Jul 6, 4:55 PM CDT | Thunderstorm Wind 0 | Madison, 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
Salem-Leckrone, IL (KSLO), launched 12:00Z, 9.4 hours before the alert went out and 135 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
- 2811 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 724 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 8.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 062125 SVRSTL MOC183-ILC013-083-119-062215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 424 PM CDT MON JUL 6 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 515 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EAST CENTRAL MISSOURI... ST. CHARLES SOUTHWEST ILLINOIS... SOUTHERN CALHOUN...JERSEY AND NORTH AND WEST MADISON AT 420 PM A LINE OF SEVERE THUNDERSTORMS STRETCHED FROM JUST SOUTH OF JERSEYVILLE ILLINOIS TO ST. PETERS MISSOURI...20 TO 30 MILES NORTH AND NORTHWEST OF ST. LOUIS. THE STORMS WERE MOVING TO THE EAST SOUTHEAST AT 25 MPH AND WILL PRODUCE EXTREMELY HEAVY RAIN...STRONG WINDS AND LARGE HAIL. MCCARTHY
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 6, 10:30 AM CDT, 5 hours 54 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ST LOUIS MO 1030 AM CDT MON JUL 6 1987 ...ONE VERY STRONG THUNDERSTORM WEST OF ST. LOUIS... AT 1025 AM...ONE VERY STRONG THUNDERSTORM WAS 35 MILES WEST OF ST LOUIS...JUST SOUTH OF WENTZVILLE MISSOURI...MOVING EAST AT 25 MILES AN HOUR. THIS STORM WILL PRODUCE EXTREMELY HEAVY RAIN...STRONG WINDS...FREQUENT LIGHTNING AND POSSIBLY HAIL AS IT MOVES THROUGH ST. CHARLES COUNT_Y...THE NORTHEAST TIP OF FRANKLIN COUNTY AND INTO WEST ST. LOUIS COUNTY BY 11 AM. HUTSELL
Special weather statement, Jul 6, 12:37 PM CDT, 3 hours 47 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ST LOUIS MO 1235 PM CDT MON JUL 6 1987 ...SEVERE THUNDERSTORM WATCH FOR PARTS OF SOUTHERN ILLINOIS TIL 5 PM... AT 1230 PM VERY STRONG THUNDERSTORMS WERE SCATTERED 25 TO 75 MILES NORTH AND EAST OF ST. LOUIS. A SEVERE THUNDERSTORM WAS 35 MILES EAST SOUTHEAST OF ST. LOUIS...BETWEEN BREESE AND OKAWVILLE ILLINOIS. THIS STORM PRODUCED LARGE HAIL JUST EAST OF BELLEVILLE ILLINOIS AROUND NOON. OTHER VERY STRONG STORMS WERE BETWEEN WATERLOO AND NEW ATHENS ILLINOIS ABOUT 25 MILES SOUTHEAST OF ST. LOUIS...AND NEAR THE MISSISSIPPI RIVER SOUTH OF ELSBERRY MISSOURI...ABOUT 40 MILES NORTHWEST OF ST. LOUIS. THE STORMS WERE MOVING EAST AT 25 MPH. MCCARTHY
Special weather statement, Jul 6, 2:05 PM CDT, 2 hours 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA MO 200 PM CDT MON JUL 6 1987 ...STRONG THUNDERSTORMS OVER AUDRAIN AND CALLAWAY COUNTIES... AT 155 PM CDT STRONG THUNDERSTORMS WERE IN AN AREA 15 MILES WIDE FROM MEXICO IN AUDRAIN COUNTY OR 25 MILES NORTHEAST OF COLUMBIA TO EAST OF KINGDOM CITY OR 25 MILES EAST OF COLUMBIA. THESE STORMS COULD PRODUCE VERY HEAVY RAIN AND POSSIBLE HAIL AND DANGEROUS LIGHTNING. THE STORMS WERE MOV.ING EAST AT 25 MILES AN HOUR. WATCH FOR THREATENING WEATHER AND BE PREPARED TO MOVE TO SAFETY IF YOU ARE IN THE AREA THREATENED BY THESE STORMS. MET
Special weather statement, Jul 6, 2:54 PM CDT, 1 hour 30 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 250 PM CDT MON JUL 6 1987 ...STORMS MOVING THROUGH PIKE COUNTY MISSOURI INTO PIKE COUNTY ILLINOIS. AT 245 PM THUNDERSTORMS PELLTED BOYWLING GREEN MISSOURI WITH SMALL HAIL. BOWLING GREEN IS ABOUT 60 MILES NORTHWEST OF ST LOUIS. THESE STORMS WERE MOVING EAST AT 25 MPH AND WILL PASS THROUGH LOUISIANA MISSOURI AND PITTSFIELD ILLINOIS BETWEEN 250 PM AND 4 PM. HAMILTON
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 8:09 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 36 min |
| Jul 6, 11:20 AM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 55 min |
| Jul 6, 12:00 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 60 min |
| Jul 6, 1:05 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Marion, Washington | 40 min |
| Jul 6, 3:10 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Pike | 50 min |
| Jul 6, 3:24 PM CDT | Severe Thunderstorm Warning | LSX | Greene | 39 min |
| Jul 6, 4:55 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 35 min |
| Jul 6, 5:26 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 64 min |
| Jul 6, 5:52 PM CDT | Severe Thunderstorm Warning | LSX | Effingham | 53 min |
| Jul 6, 10:47 AM CDT | Severe Thunderstorm Warning | LSX | Saint Louis, City of Saint Louis | 25 min |
| Jul 6, 4:14 PM CDT | Severe Thunderstorm Warning | LSX | Saint Louis, City of Saint Louis | 46 min |
| Jul 6, 5:20 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis, Warren | 40 min |
| Jul 6, 5:20 PM CDT | Severe Thunderstorm Warning | LSX | City of Saint Louis | 40 min |
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.