Alert archive / Illinois / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 4, NWS Lincoln, IL

April 15, 1994Winnebago County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Apr 15, 1994, 12:05 AM CDT for Winnebago County, Illinois. It was in force for 27 min.

The area

The counties it named.

The facts

Issued
Apr 15, 1994, 12:05 AM CDT (05:05 UTC)
Expired
Apr 15, 1994, 12:32 AM CDT
In force
27 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Winnebago County, IL

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 5.1 hours before the alert went out and 454 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, Minneapolis, MN at 00:00Z on 1994-04-15Temperature 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, Minneapolis, MN at 00:00Z on 1994-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.1939587897Sfc1 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
2199 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
178 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 KRFD 150505
SVRRFD
ILC201-150545-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE ROCKFORD IL
1205 AM CDT FRI APR 15 1994

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1245 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE NORTH CENTRAL PART OF ILLINOIS
      NORTHWEST WINNEBAGO

AT 1202 AM CDT...RADAR INDICATED A STRONG THUNDERSTORM IN NORTH
EASTERN STEPHENSON COUNTY.  THIS STORM HAS A HISTORY OF PRODUCING
GOLF BALL-SIZED HAIL. IT IS MOVING TO THE NORTHEAST AROUND 40 MPH
AND WILL ENTER WINNEBAGO COUNTY BY 1205 AM.

SOME COMMUNITIES THAT WILL BE AFFECTED BY THIS SEVERE THUNDERSTORM...
DURAND...SHIRLAND

IF YOU ARE IN THE PATH OF THIS STORM...MOVE OUT OF AREAS THAT ARE
PRONE TO FLOODING AND TAKE SHELTER.  DAMAGING WINDS...LARGE HAIL
AND VERY HEAVY RAIN IS IMMINENT! REMEMBER...SEVERE THUNDERSTORMS
CAN ALSO PRODUCE TORNADOES WITH LITTLE OR NO WARNING!

PfETROVICH

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 11:34 PM CDTSevere Thunderstorm WarningILXCarroll, Stephenson41 min
Apr 15, 3:13 AM CDTSevere Thunderstorm WarningILXCarroll32 min
Apr 15, 3:37 AM CDTSevere Thunderstorm WarningILXLee, Ogle53 min
Apr 15, 4:01 AM CDTSevere Thunderstorm WarningILXWinnebago34 min
Apr 15, 4:06 AM CDTSevere Thunderstorm WarningILXMenard39 min
Apr 15, 4:39 AM CDTSevere Thunderstorm WarningILXPiatt45 min
Apr 15, 4:39 AM CDTSevere Thunderstorm WarningILXChampaign46 min
Apr 15, 4:59 AM CDTSevere Thunderstorm WarningILXMcLean61 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1994Every severe thunderstorm warning in 1994

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.