Alert archive / Illinois / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 17, 1991, 4:20 PM CST for Madison County, Illinois. It was in force for 25 min.
The area
The counties it named.
The facts
- Issued
- Mar 17, 1991, 4:20 PM CST (22:20 UTC)
- Expired
- Mar 17, 1991, 4:45 PM CST
- In force
- 25 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Madison County, IL
The nearest sounding before it
Paducah/Barkley, KY (KPAH), launched 12:00Z, 10.3 hours before the alert went out and 222 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
- 1176 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 251 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 172219 SVRSTL ILC119-133-163-MOC099-172300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 420 PM CST SUN MAR 17 1991 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 500 PM CST FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHWEST ILLINOIS ...MADISON COUNTY...MONROE COUNTY...ST CLAIR COUNTY IN EAST CENTRAL MISSOURI ...NORTHERN JEFFERSON COUNTY AT 410 PM...RADAR INDICATED A SHORT LINE OF SEVERE THUNDERSTORMS HAD DEVELOPED RAPIDLY FROM 15 MILES SOUTH SOUTHWEST OF ST LOUIS TO 10 MILES EAST OF ST LOUIS. THE STORMS WERE MOVING EAST AT 35 MPH. THESE STORMS WILL PASS JUST THROUGH THE THE EAST ST LOUIS AND BELLEVILLE AREAS. LARGE HAIL AND DAMAGING WINDS ARE EXPECTED. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
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, Mar 17, 12:22 PM CST, 3 hours 58 minutes before
MOZ010-171915- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA MO 1220 PM CST SUN MAR 17 1991 ...A NARROW BAND OF STRONG THUNDERSTORMS MOVING ACROSS CENTRAL MISSOURI... AT 1220 PM A NARROW BAND OF STRONG THUNDERSTORMS 5 MILES WIDE EXTENDED FROM 5 MILES NORTHEAST OF THE CITY OF COLUMBIA TO JEFFERSON CITY MOVING NORTHEAST AT 35 MILES AN HOUR. THESE THUNDERSTORMS PRODUCED PEA SIZED HAIL JUST WEST OF COLUMBIA AT NOON...AND BRIEF GUSTY WINDS OF 40 TO 45 MILES AN HOUR. A SHORT PERIOD OF VERY HEAVY RAIN ALSO ACCOMPANIED THESE THUNDERSTORM AS THEY MOVED NORTHEAST. THE THUNDERSTORMS WILL MOVE THROUGH CALLAWAY AND AUDRAIN COUNTIES BETWEEN 1220 AND 100 PM THIS AFTERNOON. LA GREE ]
Local storm report, Mar 17, 2:20 PM CST, 2 hours before
MO010-172030-
PRELIMINARY STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA MO
215 PM CST SUN MAR 17 1991
TIME COUNTY REPORT
1150 AM BOONE PEA SIZED HAIL 5 MILES WEST OF COLUMBIA.
1250 PM CALLAWAY GOLF BALL SIZED HAIL REPORTED AT GASPERS TRUCK
PLAZA IN KINGDOM CITY.
100 PM AUDRAIN PEA TO MARBLE SIZED HAIL NEAR MEXICO.
120 PM MONTGOMERY 1/2 TO 3/4 INCH HAIL COMPLETELY COVERED THE
GROUND IN AND AROUND MONTGOMERY CITY.
147 PM MONTGOMERY 3/4 INCH HAIL PELTING HIGH HILL. POWER LINES
DOWN.
LA GREESpecial weather statement, Mar 17, 2:34 PM CST, 1 hour 46 minutes before
MOZ010-011-012-013-014-017-018-171000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 225 PM CST SUN MAR 17 1991 ...THUNDERSTORMS ARE DEVELOPING JUST WEST OF ST LOUIS... THUNDERSTORMS HAVE BEEN DEVELOPING SINCE 130 PM TO THE WEST OF ST LOUIS IN WESTERN WARREN AND NORTHWEST FRANKLIN COUNTIES. AT 225 PM THE HEAVIEST STORMS WERE JUST WEET OF WARRENTON AND ABOUT 10 MILES WEST OF WASHINGTON MISSOURI. SIMILAR STORMS FURTHER NORTH AND WEST SPEWED SMALL HAIL WHICH COVERED THE GROUND. THESE STORMS WILL BE MOVING TO THE EAST NORTHEAST AT 30 MPH. PERSONS IN THE COMMUNITIES OF WENTZVILLE AND LAKE ST LOUIS ALONG INTERSTATE 70 WILL BE IN THE PATH OF THE NORTHERN STORM...WHILE THE COMMUNITIES OF WASHINGTON AND AUGUSTA..AS WELL AS POSSIBLY BABLER STATE PARK WILL BE NEAREST THE SOUTHERN STORM. KEEP ABREAST OF LATEST WEATHER DEVELOPMENTS IN YOUR AREA AND STAY TUNED FOR LATER STATEMENTS OR POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. PEDIGO
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 4:20 PM CST | Severe Thunderstorm Warning | LSX | Monroe, Saint Clair | 25 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1991Every severe thunderstorm warning in 1991
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.