Alert archive / Illinois / Heat Advisories in 2026
Heat Advisory 2, NWS Lincoln, IL
NWS Lincoln, IL issued this heat advisory at Jun 28, 2026, 2:13 AM CDT for 35 counties in Illinois. It took effect at Jun 29, 2026, 11:00 AM CDT. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Jun 28, 2026, 2:13 AM CDT (07:13 UTC)
- In effect from
- Jun 29, 2026, 11:00 AM CDT
- Expired
- Jun 30, 2026, 12:23 AM CDT
- In force
- 13 hr
- 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 07:15 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 00:00Z, 7.2 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.
- Mixed-layer CAPE
- 30 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 681 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, 6:24 PM CDT, 7 hours 49 minutes earlier.
Area forecast discussion, Jun 27, 6:24 PM CDT, 7 hours 49 minutes before
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</html>Hazardous weather outlook, Jun 27, 2:12 PM CDT, 12 hours 1 minute before
Hazardous Weather Outlook National Weather Service Lincoln IL 212 PM CDT Sat Jun 27 2026 ILZ030-031-038-043>046-055>057-063-281915- Marshall-Woodford-McLean-De Witt-Piatt-Champaign-Vermilion-Douglas- Coles-Edgar-Clark- 212 PM CDT Sat Jun 27 2026 This Hazardous Weather Outlook is for central Illinois and east central Illinois. .DAY ONE...Tonight. There is a 30% chance for isolated thunderstorms today and tonight. The primary hazards with any such activity will be brief heavy rainfall, cloud-to-ground lightning, and gusty thunderstorm winds up to 60 mph. Residual flooding along the Illinois River will persist. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Dangerous heat will span from Monday through Friday with daily temperatures forecast to reach the lower 90s and heat index values up to 105 degrees. The prolonged period of the heat and the fact that warm nighttime temperatures will offer limited relief make this a potentially dangerous situation. Residual flooding along the Illinois River will persist. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated tonight. ILZ027>029-036-037-040>042-047>054-061-062-066>068-071>073-281915- Knox-Stark-Peoria-Fulton-Tazewell-Schuyler-Mason-Logan-Cass-Menard- Scott-Morgan-Sangamon-Christian-Macon-Moultrie-Shelby-Cumberland- Effingham-Jasper-Crawford-Clay-Richland-Lawrence- 212 PM CDT Sat Jun 27 2026 This Hazardous Weather Outlook is for central Illinois, east central Illinois, southeast Illinois and west central Illinois. .DAY ONE...Tonight. Areas near and south of Interstate 70 have an active risk of flash flooding due to ongoing thunderstorms. Rainfall rates may exceed 1 inch per hour through the afternoon hours before tapering off this evening. Elsewhere, there is a 30% chance for isolated thunderstorms through tonight. The primary hazards with any such activity will be brief heavy rainfall, cloud-to-ground lightning, and gusty thunderstorm winds up to 60 mph. Residual flooding along the Embarras and Little Wabash rivers will persist. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Dangerous heat will span from Sunday through Friday with daily temperatures forecast to reach the lower 90s and heat index values up to 105 degrees. The prolonged period of the heat and the fact that warm nighttime temperatures will offer limited relief make this a potentially dangerous situation. Residual flooding along the Embarras and Little Wabash rivers will persist. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated tonight. MJA
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 2:34 AM CDT | Dense Fog Advisory | ILX | Champaign, Christian, Clark, Clay, Coles, Crawford and 20 more | 6 hr |
Nearby
Heat Advisories in Illinois, 2026Every heat advisory in 2026
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.