Alert archive / Illinois / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 4, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 7, 1986, 4:03 PM CST for Bond County, Clinton County, Illinois. It was in force for 47 min. 2 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
- Apr 7, 1986, 4:03 PM CST (22:03 UTC)
- Expired
- Apr 7, 1986, 4:50 PM CST
- In force
- 47 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Bond County, IL, Clinton 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 |
|---|---|---|---|
| Apr 7, 4:15 PM CST | Hail 0.75 | Clinton, IL | |
| Apr 7, 4:30 PM CST | Hail 0.75 | 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, 10.1 hours before the alert went out and 47 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2086 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 154 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 072203 SVRSTL ILC027-005-072250- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SAINT LOUIS MO 403 PM CST MON APR 7 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 450 PM CST FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTH CENTRAL ILLINOIS...CLINTON AND BOND AT 355 PM CST RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM NEAR CARLYLE ILLINOIS TO 20 MILES EAST OF ALTON ILLINOIS. THE STRONGEST STORMS WERE LOCATED NEAR GERMANTOWN OR 15 MILES SOUTHWEST OF CARLYLE AND 15 MILES EAST OF GREENVILLE ILLINOIS. THE LINE OF STORMS WAS MOVING EAST AT 15 MPH. BOATERS ON LAKES SHOULD MOVE TO SHELTER IMMEDIATELY.% SEVERE THUNDERSTORMS WILL PRODUCE DAMAGING WINDS..LARGE HAIL AND DEADLY LIGHTNING. HAMILTON
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, Apr 7, 2:53 PM CST, 1 hour 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 253 PM CST MON MAR 10 1986 ...STRONG THUNDERSTORMS IN THE ST. LOUIS METROPOLITAN AREA... AT 245 PM..RADAR SHOWED A LINE OF VERY STRONG THUNDERSTORMS FROM THE ST. LOUIS METROPOLITAN AREA..EXTENDING NORTHEAST INTO CENTRAL ILLINOIS. ONE VERY STRONG STORM WAS NEAR ALTON ILLINOIS. IT DROPPED MARBLE SIZE HAIL NEAR BRIGHTON AND ALTON ILLINOIS..ABOUT 25 MILES NORTH OF ST. LOUIS BETWEEN 230 AND 245 PM. ANOTHER STORM DROPPED SMALL HAIL AT THE WEATHER SERVICE FORECAST OFFICE AT ST. PETERS MISSOURI..JUST WEST OF ST. LOUIS BETWEEN 230 AND 245 PM. THE STORMS WERE MOVING TO THE EAST SOUTHEAST AT 25 MPH. MCCARTHY
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 4:26 PM CST | Severe Thunderstorm Warning | LSX | Madison | 34 min |
| Apr 7, 4:32 PM CST | Severe Thunderstorm Warning | LSX | Jefferson, Washington | 58 min |
| Apr 7, 5:37 PM CST | Severe Thunderstorm Warning | LSX | Effingham | 23 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.