Alert archive / Illinois / Heat Advisories in 2015

Heat Advisory 3, NWS Lincoln, IL

July 27, 201531 counties in Illinois

NWS Lincoln, IL issued this heat advisory at Jul 27, 2015, 3:01 PM CDT for 31 counties in Illinois. It took effect at Jul 28, 2015, 1:00 PM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jul 27, 2015, 3:01 PM CDT (20:01 UTC)
In effect from: Jul 28, 2015, 1:00 PM CDT
Expired: Jul 28, 2015, 8:00 PM CDT
In force: 7 hr
Issued by: NWS Lincoln, IL

All 31 counties

Cass County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt 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, Woodford County, IL

The radar

The Lincoln radar (KILX), 36 km from the middle of the area, began a volume at 20:01 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, 8.0 hours before the alert went out and 56 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: 143 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 752 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 46 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 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 Jul 27, 2:56 PM CDT, 5 minutes earlier.

Area forecast discussion, Jul 27, 2:56 PM CDT, 5 minutes before

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Hazardous weather outlook, Jul 27, 11:34 AM CDT, 3 hours 27 minutes before

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Nearby

Heat Advisories in Illinois, 2015 Every heat advisory in 2015

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.