Alert archive / Illinois / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 112, NWS Chicago, IL

August 31, 2013Ford County, Iroquois County, Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Aug 31, 2013, 3:19 PM CDT for Ford County, Iroquois County, Livingston County, Illinois. It was in force for 41 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: Aug 31, 2013, 3:19 PM CDT (20:19 UTC)
Expired: Aug 31, 2013, 4:00 PM CDT
In force: 41 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Ford County, IL, Iroquois County, IL, Livingston County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.3 hours before the alert went out and 74 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: 1297 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 14 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 Aug 31, 2:07 PM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Aug 31, 2:07 PM CDT, 1 hour 12 minutes before

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Hazardous weather outlook, Aug 31, 12:04 PM CDT, 3 hours 15 minutes before

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In the hours before

Local storm report, Aug 31, 11:23 AM CDT, 3 hours 56 minutes before

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Local storm report, Aug 31, 11:34 AM CDT, 3 hours 45 minutes before

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Local storm report, Aug 31, 11:38 AM CDT, 3 hours 41 minutes before

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Local storm report, Aug 31, 12:36 PM CDT, 2 hours 43 minutes before

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Special weather statement, Aug 31, 1:27 PM CDT, 1 hour 52 minutes before

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Special weather statement, Aug 31, 1:45 PM CDT, 1 hour 34 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
Aug 30, 7:22 PM CDT	Special Weather Statement	LOT	Ford, Iroquois, Livingston	53 min
Aug 30, 7:54 PM CDT	Areal Flood Advisory	LOT	Ogle	4 hr
Aug 30, 8:00 PM CDT	Special Weather Statement	LOT	Ogle	45 min
Aug 30, 8:12 PM CDT	Special Weather Statement	LOT	Kendall	33 min
Aug 30, 9:30 PM CDT	Special Weather Statement	LOT	LaSalle	60 min
Aug 30, 10:03 PM CDT	Special Weather Statement	LOT	Ford, Livingston	27 min
Aug 31, 3:19 AM CDT	Special Weather Statement	LOT	Boone, Winnebago	56 min
Aug 31, 11:21 AM CDT	Severe Thunderstorm Warning	LOT	Kendall, LaSalle	39 min
Aug 31, 11:30 AM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	60 min
Aug 31, 1:27 PM CDT	Special Weather Statement	LOT	Will	48 min
Aug 30, 7:10 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Porter	65 min
Aug 31, 1:45 PM CDT	Special Weather Statement	LOT	Lake, Porter	45 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2013 Every severe thunderstorm warning in 2013

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.