Alert archive / Illinois / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 19, NWS Chicago, IL

June 29, 1990Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 29, 1990, 3:48 AM CDT for Livingston County, Illinois. It was in force for 57 min.

The area

The counties it named.

The facts

Issued
Jun 29, 1990, 3:48 AM CDT (08:48 UTC)
Expired
Jun 29, 1990, 4:45 AM CDT
In force
57 min
Issued by
NWS Chicago, IL
Area
Whole counties

County Livingston County, IL

The radar

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 8.8 hours before the alert went out and 401 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, Green Bay/Straub, WI at 00:00Z on 1990-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 840 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, Green Bay/Straub, WI at 00:00Z on 1990-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 152 square meters per square second.193958Sfc1 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
840 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
630 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
152 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
0.6
Supercell composite
5.1

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 Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 28, 7:48 PM CDTSevere Thunderstorm WarningLOTFord, Livingston42 min
Jun 29, 1:20 AM CDTSevere Thunderstorm WarningLOTLake, McHenry60 min
Jun 29, 1:45 AM CDTSevere Thunderstorm WarningLOTCook, DuPage, Kane60 min
Jun 29, 2:19 AM CDTSevere Thunderstorm WarningLOTKendall, LaSalle56 min
Jun 29, 2:58 AM CDTSevere Thunderstorm WarningLOTGrundy62 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1990Every severe thunderstorm warning in 1990

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.