Alert archive / Illinois / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 35, NWS Indianapolis, IN

April 27, 1989Knox County, Indiana; Crawford County, Lawrence County, Illinois

NWS Indianapolis, IN issued this severe thunderstorm warning at Apr 27, 1989, 12:01 AM EST for Knox County, Indiana; Crawford County, Lawrence County, Illinois. It was in force for 44 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 27, 1989, 12:01 AM EST (05:01 UTC)
Expired
Apr 27, 1989, 12:45 AM EST
In force
44 min
Issued by
NWS Indianapolis, IN
Area
Whole counties

Counties Crawford County, IL, Lawrence County, IL, Knox County, IN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Apr 27, 12:38 AM ESTThunderstorm Wind 0Crawford, IL
Apr 27, 12:45 AM ESTThunderstorm Wind 0Lawrence, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 00:00Z, 5.0 hours before the alert went out and 267 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, Peoria Regional, IL at 00:00Z on 1989-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1526 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, Peoria Regional, IL at 00:00Z on 1989-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
1526 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
1669 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

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 Indianapolis, IN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 26, 7:15 PM ESTSevere Thunderstorm WarningINDJackson, Lawrence45 min
Apr 26, 11:44 PM ESTSevere Thunderstorm WarningINDSullivan, Vigo46 min
Apr 27, 12:21 AM ESTSevere Thunderstorm WarningINDClay, Greene, Owen54 min
Apr 27, 1:23 AM ESTSevere Thunderstorm WarningINDKnox37 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1989Severe Thunderstorm Warnings in Indiana, 1989Every severe thunderstorm warning in 1989

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.