Alert archive / Illinois / Tornado Warnings in 1991

Tornado Warning 6, NWS Lincoln, IL

April 29, 1991McLean County, Woodford County, Illinois

NWS Lincoln, IL issued this tornado warning at Apr 29, 1991, 7:04 PM CDT for McLean County, Woodford County, Illinois. It was in force for 26 min.

The area

The counties it named.

The facts

Issued
Apr 29, 1991, 7:04 PM CDT (00:04 UTC)
Expired
Apr 29, 1991, 7:30 PM CDT
In force
26 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties McLean County, IL, Woodford County, IL

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 00:00Z, 0.1 hours before the alert went out and 398 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 00:00Z on 1991-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 1991-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 176 square meters per square second.1939587897117Sfc1 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
7 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
847 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
176 m²/s²
0-3 km storm-relative helicity
135 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 KPIA 300004
TORPIA
ILC203-113-300030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE PEORIA IL
704 PM CDT MON APR 29 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 730 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE CENTRAL PART OF ILLINOIS
      SOUTHWEST WOODFORD...WESTERN MCLEAN

AT 700 PM CDT A FUNNEL CLOUD WAS REPORTED NEAR MACKINAW
IN TAZEWELL COUNTY.  STORMS WERE MOVING TO THE NORTH AT 30
MPH.

WITH THIS NOVEMENT THE STORM WITH THE POSSIBLE FUNNEL CLOUD
WILL MOVE NEAR MORTON.

IF YOU ARE IN THE PATH OF THIS TORNADO...GO TO A BASEMENT SHELTER
IF AVAILABLE...OTHERWISE TO A CENTRAL INTERIOR ROOM ON THE LOWEST
FLOOR.  ABANDON CARS AND MOBILE HOMES FOR A REINFORCED BUILDING.

THIS IS A DANGEROUS STORM.  TAKE COVER IMMEDIATELY.

ATTN ISP 8

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 7:33 PM CDTTornado WarningILXMcLean, Woodford27 min
Apr 29, 7:40 PM CDTSevere Thunderstorm WarningILXChristian, Macon65 min
Apr 29, 7:40 PM CDTSevere Thunderstorm WarningILXDeWitt65 min
Apr 29, 7:41 PM CDTTornado WarningILXDeKalb, Lee34 min
Apr 29, 7:58 PM CDTTornado WarningILXBoone32 min
Apr 29, 8:02 PM CDTTornado WarningILXMcLean58 min
Apr 29, 8:31 PM CDTTornado WarningILXDeWitt, Piatt44 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.