Alert archive / Illinois / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 27, NWS Chicago, IL

June 7, 2015Grundy County, Kankakee County, Will County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 7, 2015, 3:48 PM CDT for Grundy County, Kankakee County, Will 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 7, 2015, 3:48 PM CDT (20:48 UTC)
Expired: Jun 7, 2015, 4:30 PM CDT
In force: 42 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Grundy County, IL, Kankakee County, IL, Will County, IL

The radar

The Chicago radar (KLOT), 35 km from the middle of the area, began a volume at 20:51 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.

Issued	Product	Office	Lasted
Jun 7, 2:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.8 hours before the alert went out and 134 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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, 24 minutes earlier.

Area forecast discussion, Jun 7, 3:24 PM CDT, 24 minutes before

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Hazardous weather outlook, Jun 7, 11:27 AM CDT, 4 hours 21 minutes before

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In the hours before

Local storm report, Jun 7, 10:00 AM CDT, 5 hours 48 minutes before

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Local storm report, Jun 7, 11:31 AM CDT, 4 hours 17 minutes before

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Local storm report, Jun 7, 12:09 PM CDT, 3 hours 39 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 36 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, 3 hours 12 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

Local storm report, Jun 7, 3:30 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
330 PM CDT SUN JUN 07 2015

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

0325 PM     HEAVY RAIN       PEOTONE                 41.33N 87.80W
06/07/2015  M1.45 INCH       WILL               IL   CO-OP OBSERVER

            1.45 INCHES IN ONE HOUR. TOTAL SO FAR 1.90 INCHES SINCE 7
            AM.

&&

BN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 3:08 AM CDT	Small Craft Advisory	LOT		16 hr
Jun 7, 6:05 AM CDT	Special Weather Statement	LOT	Boone, DeKalb, Lee, McHenry, Ogle, Winnebago	55 min
Jun 7, 3:24 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Livingston	51 min
Jun 7, 3:30 PM CDT	Severe Thunderstorm Warning	LOT	Will	45 min
Jun 7, 4:06 PM CDT	Flash Flood Warning	LOT	Kankakee, Will	6 hr
Jun 7, 4:11 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	34 min
Jun 7, 4:42 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee	33 min
Jun 7, 4:47 PM CDT	Severe Thunderstorm Warning	LOT	Livingston	28 min
Jun 7, 5:10 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	65 min
Jun 7, 5:14 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	31 min
Jun 7, 5:18 PM CDT	Flash Flood Warning	LOT	Iroquois, Kankakee	5 hr
Jun 7, 5:19 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	56 min
Jun 7, 6:01 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois	29 min
Jun 7, 6:23 PM CDT	Flash Flood Warning	LOT	Ford, Iroquois	6 hr
Jun 7, 4:13 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Porter	62 min
Jun 7, 4:31 PM CDT	Severe Thunderstorm Warning	LOT	Lake, Newton	44 min
Jun 7, 4:35 PM CDT	Tornado Warning	LOT	Jasper, Porter	23 min
Jun 7, 4:57 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Newton	48 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2015 Every 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.