Alert archive / Illinois / Heat Advisories in 2018

Heat Advisory 2, NWS Lincoln, IL

June 27, 201835 counties in Illinois

NWS Lincoln, IL issued this heat advisory at Jun 27, 2018, 2:55 PM CDT for 35 counties in Illinois. It took effect at Jun 29, 2018, 10:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: Jun 27, 2018, 2:55 PM CDT (19:55 UTC)
In effect from: Jun 29, 2018, 10:00 AM CDT
Expired: Jun 28, 2018, 2:52 PM CDT
In force
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 radar

The Lincoln radar (KILX), 42 km from the middle of the area, began a volume at 20:00 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.9 hours before the alert went out and 449 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: 5 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 170 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 Jun 27, 12:51 PM CDT, 2 hours 4 minutes earlier.

Area forecast discussion, Jun 27, 12:51 PM CDT, 2 hours 4 minutes before

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Hazardous weather outlook, Jun 27, 11:43 AM CDT, 3 hours 12 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 8:46 PM CDT	Tornado Warning Tornado observed	ILX	Vermilion	13 min

Nearby

Heat Advisories in Illinois, 2018 Every heat advisory in 2018

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.