Alert archive / Illinois / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 72, NWS Chicago, IL

October 6, 2018Iroquois County, Kankakee County, Illinois; Newton County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Oct 6, 2018, 1:08 PM CDT for Iroquois County, Kankakee County, Illinois; Newton County, Indiana. It was in force for 22 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
Oct 6, 2018, 1:08 PM CDT (18:08 UTC)
Expired
Oct 6, 2018, 1:30 PM CDT
In force
22 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Iroquois County, IL, Kankakee County, IL, Newton County, IN

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 6.1 hours before the alert went out and 246 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 2018-10-06Temperature 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 2018-10-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -62 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
502 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
-62 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 5, 7:28 PM CDTSpecial Weather StatementLOTLee32 min
Oct 5, 7:47 PM CDTSpecial Weather StatementLOTKendall43 min
Oct 5, 8:10 PM CDTSpecial Weather StatementLOTLee35 min
Oct 5, 8:41 PM CDTSpecial Weather StatementLOTDeKalb34 min
Oct 5, 9:01 PM CDTRiver Flood WarningLOTKane, Kendall10 days
Oct 5, 9:11 PM CDTRiver Flood AdvisoryLOTCook7 days
Oct 5, 9:11 PM CDTRiver Flood AdvisoryLOTWill23 hr
Oct 6, 3:07 AM CDTAreal Flood AdvisoryLOTBoone, Ogle, Winnebago3 hr
Oct 6, 5:01 AM CDTSpecial Weather StatementLOTLaSalle29 min
Oct 6, 9:24 AM CDTRiver Flood WarningLOTLee5 days
Oct 6, 9:24 AM CDTRiver Flood WarningLOTLake9 days
Oct 6, 9:24 AM CDTRiver Flood WarningLOTLake9 days
Oct 6, 9:42 AM CDTRiver Flood AdvisoryLOTLake7 days
Oct 6, 12:19 PM CDTSpecial Weather StatementLOTFord, Iroquois, Kankakee, Livingston56 min
Oct 6, 1:38 PM CDTSpecial Weather StatementLOTIroquois52 min
Oct 6, 3:00 PM CDTSmall Craft AdvisoryLOT36 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2018Severe Thunderstorm Warnings in Indiana, 2018Every severe thunderstorm warning in 2018

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.