Alert archive / Illinois / Heat Advisories in 2014

Heat Advisory 1, NWS Lincoln, IL

August 21, 201435 counties in Illinois

NWS Lincoln, IL issued this heat advisory at Aug 21, 2014, 3:07 PM CDT for 35 counties in Illinois. It took effect at Aug 22, 2014, 1:00 PM CDT. It was in force for 4 days.

The area

The counties it named.

The facts

Issued: Aug 21, 2014, 3:07 PM CDT (20:07 UTC)
In effect from: Aug 22, 2014, 1:00 PM CDT
Expired: Aug 26, 2014, 7:00 PM CDT
In force: 4 days
Issued by: NWS Lincoln, IL

All 35 counties

Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fulton County, IL, Jasper County, IL, Knox County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.1 hours before the alert went out and 46 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: 185 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1400 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this heat advisory went out at Aug 21, 2:57 PM CDT, 10 minutes earlier.

Area forecast discussion, Aug 21, 2:57 PM CDT, 10 minutes before

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Hazardous weather outlook, Aug 21, 12:04 PM CDT, 3 hours 3 minutes before

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In the hours before

Local storm report, Aug 21, 9:31 AM CDT, 5 hours 36 minutes before

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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 20, 11:15 PM CDT	Special Weather Statement	ILX	Clay	60 min
Aug 20, 11:25 PM CDT	Severe Thunderstorm Warning	ILX	Clay, Richland	50 min
Aug 20, 11:48 PM CDT	Flash Flood Warning	ILX	Clay	6 hr

Nearby

Heat Advisories in Illinois, 2014 Every heat advisory in 2014

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.