Alert archive / Illinois / Tornado Warnings in 1997

Tornado Warning 11, NWS Lincoln, IL

April 30, 1997DeWitt County, Illinois

NWS Lincoln, IL issued this tornado warning at Apr 30, 1997, 3:50 PM CDT for DeWitt County, Illinois. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 30, 1997, 3:50 PM CDT (20:50 UTC)
Expired
Apr 30, 1997, 4:30 PM CDT
In force
40 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County DeWitt County, IL

The radar

The Lincoln radar (KILX), 37 km from the middle of the area, began a volume at 20:54 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 30, 12:30 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.8 hours before the alert went out and 26 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, Lincoln, IL at 12:00Z on 1997-04-30Temperature 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, Lincoln, IL at 12:00Z on 1997-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 square meters per square second.19395878Sfc1 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
1130 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
166 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 2:03 PM CDTTornado WarningILXSchuyler27 min
Apr 30, 2:27 PM CDTTornado WarningILXFulton, Schuyler48 min
Apr 30, 2:48 PM CDTTornado WarningILXKnox42 min
Apr 30, 3:02 PM CDTTornado WarningILXPeoria, Tazewell43 min
Apr 30, 3:02 PM CDTTornado WarningILXMason43 min
Apr 30, 3:15 PM CDTTornado WarningILXChristian45 min
Apr 30, 3:23 PM CDTTornado WarningILXMarshall, Stark37 min
Apr 30, 3:32 PM CDTTornado WarningILXMacon43 min
Apr 30, 3:43 PM CDTTornado WarningILXMcLean, Tazewell47 min
Apr 30, 3:57 PM CDTTornado WarningILXPiatt48 min
Apr 30, 4:00 PM CDTTornado WarningILXMarshall30 min
Apr 30, 4:05 PM CDTTornado WarningILXChampaign55 min
Apr 30, 4:30 PM CDTSevere Thunderstorm WarningILXColes, Cumberland30 min
Apr 30, 4:40 PM CDTSevere Thunderstorm WarningILXClark, Edgar50 min
Apr 30, 5:36 PM CDTSevere Thunderstorm WarningILXLawrence, Richland29 min

Nearby

Tornado Warnings in Illinois, 1997Every tornado warning in 1997Tornadoes in 1997

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; radar from the NEXRAD Level II archive.