Alert archive / Illinois / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 14, NWS Chicago, IL

May 7, 2004Kendall County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at May 7, 2004, 1:36 PM CDT for Kendall County, Illinois. It was in force for 39 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: May 7, 2004, 1:36 PM CDT (18:36 UTC)
Expired: May 7, 2004, 2:15 PM CDT
In force: 39 min
Issued by: NWS Chicago, IL
Area: Counties, with a storm outline in the text

County Kendall County, IL

The radar

The Chicago radar (KLOT), 29 km from the middle of the area, began a volume at 18:36 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, 6.6 hours before the alert went out and 161 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: 574 J/kg
Mixed-layer CIN: -327 J/kg
Mixed-layer LCL: 994 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 May 7, 12:45 PM CDT, 51 minutes earlier.

Area forecast discussion, May 7, 12:45 PM CDT, 51 minutes before

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Hazardous weather outlook, May 7, 12:00 PM CDT, 1 hour 36 minutes before

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In the hours before

Local storm report, May 7, 7:41 AM CDT, 5 hours 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
741 AM CDT FRI MAY 07 2004

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

0540 AM     TSTM WND DMG     OREGON                  42.01N 89.34W
05/07/2004                   OGLE               IL   EMERGENCY MNGR

            TREES DOWN. TREES REPORTED DOWN ON VECHILES AND ON ROADS.

&&

KRAUSE

Local storm report, May 7, 7:59 AM CDT, 5 hours 37 minutes before

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Local storm report, May 7, 8:16 AM CDT, 5 hours 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 5:43 AM CDT	Severe Thunderstorm Warning	LOT	LaSalle	32 min
May 7, 6:12 AM CDT	Severe Thunderstorm Warning	LOT	Grundy	48 min
May 7, 6:17 AM CDT	Severe Thunderstorm Warning	LOT	Livingston	43 min
May 7, 3:05 PM CDT	Severe Thunderstorm Warning	LOT	Will	40 min
May 7, 7:56 AM CDT	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	49 min
May 7, 3:33 PM CDT	Severe Thunderstorm Warning	LOT	Lake	27 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2004 Every severe thunderstorm warning in 2004

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.