Alert archive / Illinois / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 68, NWS Chicago, IL

June 28, 2019Cook County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 28, 2019, 6:48 PM CDT for Cook County, Illinois. It was in force for 42 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
Jun 28, 2019, 6:48 PM CDT (23:48 UTC)
Expired
Jun 28, 2019, 7:30 PM CDT
In force
42 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Cook County, IL

The radar

The Chicago radar (KLOT), 49 km from the middle of the area, began a volume at 23:49 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.8 hours before the alert went out and 210 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 2019-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 224 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, Lincoln, IL at 12:00Z on 2019-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 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
224 J/kg
Mixed-layer CIN
-347 J/kg
Mixed-layer LCL
1455 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
-35 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 7:15 PM CDTSpecial Weather StatementLOTDuPage45 min
Jun 28, 8:36 AM CDTSpecial Weather StatementLOTBoone, McHenry54 min
Jun 28, 8:59 AM CDTSevere Thunderstorm WarningLOTKane, McHenry46 min
Jun 28, 9:48 AM CDTSpecial Weather StatementLOTBoone, McHenry57 min
Jun 28, 10:08 AM CDTSpecial Marine WarningLOT2 hr
Jun 28, 10:22 AM CDTSpecial Weather StatementLOTLake53 min
Jun 28, 10:43 AM CDTSpecial Weather StatementLOTDuPage47 min
Jun 28, 5:39 PM CDTSpecial Weather StatementLOTWill36 min
Jun 28, 5:51 PM CDTSevere Thunderstorm WarningLOTCook, Will39 min
Jun 28, 6:22 PM CDTAreal Flood AdvisoryLOTCook, Will113 min
Jun 28, 6:43 PM CDTSpecial Weather StatementLOTCook47 min
Jun 28, 6:46 PM CDTSpecial Marine WarningLOT59 min
Jun 28, 6:58 PM CDTAreal Flood AdvisoryLOTCook2 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2019Every severe thunderstorm warning in 2019

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.