Alert archive / Illinois / Special Weather Statements in 2012

Special Weather Statement, NWS Chicago, IL

September 7, 2012Livingston County, Illinois

NWS Chicago, IL issued this special weather statement at Sep 7, 2012, 3:16 PM CDT for Livingston County, Illinois. 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 outline as issued.

The facts

Issued: Sep 7, 2012, 3:16 PM CDT (20:16 UTC)
Expired: Sep 7, 2012, 4:15 PM CDT
In force: 59 min
Issued by: NWS Chicago, IL

County Livingston County, IL

The radar

The Chicago radar (KLOT), 89 km from the middle of the area, began a volume at 20:18 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, 8.3 hours before the alert went out and 98 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: 367 J/kg
Mixed-layer CIN: -412 J/kg
Mixed-layer LCL: 1436 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 3:56 AM CDT	Small Craft Advisory	LOT		42 hr
Sep 7, 4:41 AM CDT	Rip Current Statement	LOT	Lake	41 hr
Sep 7, 3:53 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Grundy, Kankakee, Livingston	37 min
Sep 7, 4:20 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Kankakee	58 min
Sep 7, 6:23 PM CDT	Special Marine Warning	LOT		82 min
Sep 7, 5:12 PM CDT	Special Weather Statement	LOT	Jasper	48 min

Nearby

Special Weather Statements in Illinois, 2012 Every special weather statement in 2012

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.