Alert archive / Illinois / Tornado Warnings in 1991

Tornado Warning 3, NWS St. Louis, MO

May 18, 1991Adams County, Brown County, Pike County, Illinois

NWS St. Louis, MO issued this tornado warning at May 18, 1991, 3:34 PM CDT for Adams County, Brown County, Pike County, Illinois. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
May 18, 1991, 3:34 PM CDT (20:34 UTC)
Expired
May 18, 1991, 4:30 PM CDT
In force
56 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Adams County, IL, Brown County, IL, Pike County, IL

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 12:00Z, 8.6 hours before the alert went out and 366 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.

Skew-T log-pSkew-T log-p diagram, Paducah/Barkley, KY at 12:00Z on 1991-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Paducah/Barkley, KY at 12:00Z on 1991-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1517 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
-113 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSTL 182036
TORSTL
ILC001-009-149-182130-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
334 PM CDT SAT MAY 18 1991
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  430 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN WEST CENTRAL ILLINOIS
 
   ...EAST CENTRAL ADAMS COUNTY...BROWN COUNTY
   ...NORTH PIKE COUNTY
 
AT 330 PM...A TORNADO WAS REPORTED TO HAVE TOUCHED DOWN NEAR THE AIRPORT
IN QUINCY...ILLINOIS AND WAS MOVING EAST AT 20 MPH. THE FUNNEL CLOUD
LIFTED AND TOUCHED DOWN SEVERAL TIMES.
 
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE].
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
TUCKER

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 17, 9:10 PM CDTSevere Thunderstorm WarningLSXAdams65 min

Nearby

Tornado Warnings in Illinois, 1991Every tornado warning in 1991Tornadoes 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.