Alert archive / Illinois / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 25, NWS Chicago, IL

June 7, 2015Grundy County, Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 7, 2015, 3:24 PM CDT for Grundy County, Livingston County, Illinois. It was in force for 51 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 7, 2015, 3:24 PM CDT (20:24 UTC)
Expired
Jun 7, 2015, 4:15 PM CDT
In force
51 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
70.0 mph

Counties Grundy County, IL, Livingston County, IL

The radar

The Chicago radar (KLOT), 67 km from the middle of the area, began a volume at 20:25 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 7, 2:36 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.4 hours before the alert went out and 105 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 2015-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 124 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 2015-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 256 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
124 J/kg
Mixed-layer CIN
-173 J/kg
Mixed-layer LCL
1036 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
256 m²/s²
0-3 km storm-relative helicity
263 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 7, 3:24 PM CDT, 0 minutes earlier.

Area forecast discussion, Jun 7, 3:24 PM CDT, 0 minutes before
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Hazardous weather outlook, Jun 7, 11:27 AM CDT, 3 hours 57 minutes before
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In the hours before

Local storm report, Jun 7, 10:00 AM CDT, 5 hours 24 minutes before
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      <div class="status" id="status">Temporary Notice</div>
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Local storm report, Jun 7, 11:31 AM CDT, 3 hours 53 minutes before
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Local storm report, Jun 7, 12:09 PM CDT, 3 hours 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1209 PM CDT SUN JUN 07 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1200 PM     HEAVY RAIN       PARK FOREST             41.48N 87.69W
06/07/2015  M1.45 INCH       COOK               IL   PUBLIC

&&

C
Local storm report, Jun 7, 12:12 PM CDT, 3 hours 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1212 PM CDT SUN JUN 07 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1200 PM     HEAVY RAIN       3 WSW CHICAGO HEIGHTS   41.49N 87.68W
06/07/2015  M1.54 INCH       COOK               IL   COCORAHS

&&

C
Local storm report, Jun 7, 12:36 PM CDT, 2 hours 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1236 PM CDT SUN JUN 07 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1233 PM     HEAVY RAIN       4 NE CROWN POINT        41.47N 87.32W
06/07/2015  E0.00 INCH       LAKE               IN   TRAINED SPOTTER

            APPROX HALF FOOT TO A FOOT OF STANDING WATER NEAR 83RD
            AVE AND MISSISSIPPI ST.

&&

BMD

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 3:08 AM CDTSmall Craft AdvisoryLOT16 hr
Jun 7, 6:05 AM CDTSpecial Weather StatementLOTBoone, DeKalb, Lee, McHenry, Ogle, Winnebago55 min
Jun 7, 3:30 PM CDTSevere Thunderstorm WarningLOTWill45 min
Jun 7, 3:48 PM CDTSevere Thunderstorm WarningLOTGrundy, Kankakee, Will42 min
Jun 7, 4:06 PM CDTFlash Flood WarningLOTKankakee, Will6 hr
Jun 7, 4:11 PM CDTSevere Thunderstorm WarningLOTKankakee, Will34 min
Jun 7, 4:42 PM CDTSevere Thunderstorm WarningLOTKankakee33 min
Jun 7, 4:47 PM CDTSevere Thunderstorm WarningLOTLivingston28 min
Jun 7, 5:10 PM CDTSevere Thunderstorm WarningLOTIroquois65 min
Jun 7, 5:14 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston31 min
Jun 7, 5:18 PM CDTFlash Flood WarningLOTIroquois, Kankakee5 hr
Jun 7, 5:19 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston56 min
Jun 7, 6:01 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois29 min
Jun 7, 6:23 PM CDTFlash Flood WarningLOTFord, Iroquois6 hr
Jun 7, 4:13 PM CDTSevere Thunderstorm WarningLOTJasper, Lake, Porter62 min
Jun 7, 4:31 PM CDTSevere Thunderstorm WarningLOTLake, Newton44 min
Jun 7, 4:35 PM CDTTornado WarningLOTJasper, Porter23 min
Jun 7, 4:57 PM CDTSevere Thunderstorm WarningLOTJasper, Newton48 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2015Every severe thunderstorm warning in 2015

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.