Alert archive / Illinois / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 4, NWS Chicago, IL

April 18, 1995DeKalb County, Kane County, McHenry County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Apr 18, 1995, 10:39 AM CDT for DeKalb County, Kane County, McHenry County, Illinois. It was in force for 66 min.

The area

The counties it named.

The facts

Issued
Apr 18, 1995, 10:39 AM CDT (15:39 UTC)
Expired
Apr 18, 1995, 11:45 AM CDT
In force
66 min
Issued by
NWS Chicago, IL
Area
Whole counties

Counties DeKalb County, IL, Kane County, IL, McHenry County, IL

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 3.7 hours before the alert went out and 169 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, Davenport, at 12:00Z on 1995-04-18Temperature 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, Davenport, at 12:00Z on 1995-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 371 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
503 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
371 m²/s²
0-3 km storm-relative helicity
418 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 Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 18, 10:39 AM CDTSevere Thunderstorm WarningLOTLee, Ogle66 min
Apr 18, 10:39 AM CDTSevere Thunderstorm WarningLOTBoone, Winnebago66 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1995Every severe thunderstorm warning in 1995

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.