Alert archive / Indiana / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 166, NWS Chicago, IL

October 18, 20074 counties in Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Oct 18, 2007, 6:46 PM CDT for 4 counties in Indiana. It was in force for 59 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 18, 2007, 6:46 PM CDT (23:46 UTC)
Expired: Oct 18, 2007, 7:45 PM CDT
In force: 59 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon

Counties Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 81 km from the middle of the area, began a volume at 23:55 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
Oct 18, 3:23 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.8 hours before the alert went out and 167 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: 44 J/kg
Mixed-layer CIN: -272 J/kg
Mixed-layer LCL: 1498 m above ground
0-6 km bulk shear: 84 kt
0-1 km storm-relative helicity: 282 m²/s²
0-3 km storm-relative helicity: 260 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 Oct 18, 3:06 PM CDT, 3 hours 40 minutes earlier.

Area forecast discussion, Oct 18, 3:06 PM CDT, 3 hours 40 minutes before

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Hazardous weather outlook, Oct 18, 4:00 PM CDT, 2 hours 46 minutes before

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In the hours before

Local storm report, Oct 18, 5:49 PM CDT, 57 minutes before

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Local storm report, Oct 18, 5:50 PM CDT, 56 minutes before

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Local storm report, Oct 18, 6:17 PM CDT, 29 minutes before

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Local storm report, Oct 18, 6:31 PM CDT, 15 minutes before

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Local storm report, Oct 18, 6:32 PM CDT, 14 minutes before

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Local storm report, Oct 18, 6:44 PM CDT, 2 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
Oct 18, 9:12 AM CDT	Wind Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	10 hr
Oct 18, 5:09 PM CDT	Special Marine Warning	LOT		96 min
Oct 18, 5:13 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	29 min
Oct 18, 5:35 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Grundy, Will	55 min
Oct 18, 5:55 PM CDT	Severe Thunderstorm Warning	LOT	Cook	35 min
Oct 18, 5:56 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	50 min
Oct 18, 6:30 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee	29 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2007 Every severe thunderstorm warning in 2007

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.