Alert archive / Illinois / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 25, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 1986, 5:58 PM CDT for Clinton County, Saint Clair County, Illinois. It was in force for 47 min. 4 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 9, 1986, 5:58 PM CDT (22:58 UTC)
- Expired
- Jul 9, 1986, 6:45 PM CDT
- In force
- 47 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Clinton County, IL, Saint Clair County, IL
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 9, 6:00 PM CDT | Thunderstorm Wind 0 | Clinton, IL | |
| Jul 9, 6:15 PM CDT | Thunderstorm Wind 0 | Clinton, IL | |
| Jul 9, 6:15 PM CDT | Thunderstorm Wind 0 | Clinton, IL | |
| Jul 9, 6:30 PM CDT | Thunderstorm Wind 0 | Clinton, 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, 11.0 hours before the alert went out and 68 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
- 1507 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 1015 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.3
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 9, 3:04 PM CDT, 2 hours 54 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 304 PM CDT WED JUL 9 1986 THE HEAT INDEX HAS TOPPED 100 IN SOUTHERN MISSOURI..AND ACROSS THE MID SECTION OF THE STATE. EXTRA CAUTION IS ADVISED THIS AFTERNOON TO GUARD AGAINST THE DANGERS OF HEAT STRESS. MID AFTERNOON TEMPERATURES HAVE REACHED THE MID 90S TO AROUND 100 DEGREES IN SOUTHERN AND CENTRAL MISSOURI. TEMPERATURE READINGS IN NORTHERN MISSOURI RANGED FROM THE MID 80S TO AROUND 90 AT MID AFTERNOON. SOME RELIEF WILL APPEAR LATER IN THE AFTERNOON OVER PARTS OF EAST CENTRAL AND SOUTHEAST MISSOURI AS THUNDERSTORMS CONTINUE TO DEVELOP. IN ADDITION..THE FRONT WHICH HAS BROKEN THE EXCESSIVE HEAT IN NORTHERN MISSOURI WILL DRIFT A LITTLE FARTHER SOUTH LATE THIS AFTERNOON AND EARLY TONIGHT. IT SHOULD STALL ACROSS THE MID SECTION OF THE STATE BY EARLY THURSDAY. IN THE MEANTIME..PERSONS IN SOUTHERN AND CENTRAL MISSOURI SHOULD BE ALERT TO THE DANGER OF EXCESSIVE HEAT AND HUMIDITY. DO NOT OVERDO OUTDOOR ACTIVITIES..ESPECIALLY IN SUNNY AREAS. TAKE FREQUENT BREAKS IN THE SHADE. TRY TO KEEP YOUR INDOOR SURROUNDINGS WELL VENTILATED IF AIR CONDITIONING IS NOT AVAILABLE. WEAR LIGHT CLOTHING AND DRINK PLENTY OF NON ALCOHOLIC LIQUIDS. MCCARTHY
Special weather statement, Jul 9, 5:11 PM CDT, 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 505 PM CDT WED JUL 9 1986 .....VERY HEAVY THUNDERSTORM IN METRO EAST.... AT 5 PM CDT..A VERY HEAVY THUNDERSTORM WAS IN ST. CLAIR COUNTY ILLINOIS. THE STORM WAS MOVING EAST AT 25 MPH. THE STORM HAS DROPPED HEAVY RAIN AND HAIL TO MARBLE SIZE IN THE BELLEVILLE AREA. IT ALSO HAS PRODUCED SOME GUSTY WIND. THE STORM WILL MOVE THROUGH EASTERN ST CLAIR AND INTO WASHINGTON COUNTYp ILLINOIS BETWEEN 515 AND 630 PM AND WILL PRODUCE SOME VERY HEAVY RAIN SMALL HAIL AND WINDS 40 TO 50 MPH. TUCKER
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 5:22 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair | 38 min |
| Jul 9, 6:05 PM CDT | Severe Thunderstorm Warning | LSX | Marion | 55 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1986Every severe thunderstorm warning in 1986
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.