Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS Lincoln, IL

August 1, 201711 counties in Illinois

NWS Lincoln, IL issued this special weather statement at Aug 1, 2017, 1:43 PM CDT for 11 counties in Illinois. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 1, 2017, 1:43 PM CDT (18:43 UTC)
Expired: Aug 1, 2017, 3:45 PM CDT
In force: 2 hr
Issued by: NWS Lincoln, IL

Counties Cass County, IL, Christian County, IL, Clark County, IL, Cumberland County, IL, Mason County, IL, Menard County, IL, Morgan County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.7 hours before the alert went out and 97 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: 502 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1129 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 12:37 PM CDT	Special Weather Statement	ILX	Champaign, Coles, DeWitt, Douglas, Edgar, Logan and 7 more	3 hr
Aug 1, 2:49 PM CDT	Areal Flood Advisory	ILX	Macon	116 min
Aug 1, 4:32 PM CDT	Flash Flood Warning	ILX	McLean	4 hr

Nearby

Special Weather Statements in Illinois, 2017 Every special weather statement in 2017

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.