Alert archive / Illinois / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 6, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 7, 1986, 4:32 PM CST for Jefferson County, Washington County, Illinois. It was in force for 58 min. 1 report 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, 4:32 PM CST (22:32 UTC)
- Expired
- Apr 7, 1986, 5:30 PM CST
- In force
- 58 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Jefferson County, IL, Washington 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, 4:35 PM CST | Hail 0.75 | Washington, 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, 10.5 hours before the alert went out and 43 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 072237 COR SVRSTL ILC081-189-072330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING CORRECTION NATIONAL WEATHER SERVICE SAINT LOUIS MO 432 PM CST MON APR 7 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 530 PM CST FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTH CENTRAL ILLINOIS...JEFFERSON AND WASHINGTON AT 425 PM CST RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES WEST OF MT VERNON ILLINOIS MOVING EAST SOUTHEAST AT 25 MPH. MARBLE SIZE HAIL WAS REPORTED IN NORTHERN WASHINGTON AROUND 520 PM. BOATERS ON LAKES SHOULD MOVE TO SHELTER IMMEDIATELY. SEVERE THUNDERSTORMS WILL PRODUCE DAMAGING WINDS..LARGE HAIL AND DEADLY LIGHTNING. V HEAVY RAINS WILL QUICKLY FLOOD SMALL STREAMS AND LOW LYING AREAS. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY OR THE NATIONAL WEATHER SERVICE AT /314/922-9120.
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 39 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
Special weather statement, Apr 7, 4:23 PM CST, 9 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA MO 420 PM CST MON APR 7 1986 ...A TORNADO WATCH IS IN EFFECT FOR THE WEST HALF OF CENTRAL MISSOURI UNTIL 1100PM CST....A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE EAST HALF OF CENTRAL MISSOURI UNTIL 900PM CST... AT 415PM CST COLUMBIAS RADAR SHOWED SCATTERED THUNDERSHOWERS...SOME WITH HEAVY SHOWERS...IN A LINE ABOUT 15 MILES WIDE EXTENDING FROM KANSAS CITY TO POMME DE TERRE RESERVOIR..OR ABOUT 30 MILES NORTH OF SPRINGFIELD. THE STRONGEST THUNDERSTORM WAS ABOUT 10 MILES IN DIAMETER AND CENTERED 35 MILES NORTH OF SPRINGFIELD. THE THUNDERSTORMS HAVE BEEN DEVELOPING RAPIDLY SINCE 4PM CST AND WERE MOVING TO THE SOUTHEAST AROUND :40 MILES AN HOUR. NO SEVERE WEATHER WAS REPORTED OR INDICATED BY RADAR IN CENTRAL MISSOURI DURING THE LAST HOUR.
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 4:03 PM CST | Severe Thunderstorm Warning | LSX | Bond, Clinton | 47 min |
| Apr 7, 4:26 PM CST | Severe Thunderstorm Warning | LSX | Madison | 34 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.