Extreme Heat Warning — Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, McLean, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Champaign, IL, Vermilion, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Edgar, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL 7:00 PM Heat Advisory — Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, McLean, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Champaign, IL, Vermilion, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Edgar, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL 7:00 PM

Cass County, Illinois, United States

Last updated: 1:54 AM CDT  ·  Refresh
26°C
Feels like 27°
Clear
▲ 37°  /  ▼ 23°
Wind
7 mph S
Humidity
66%
Dew Point
20°
Pressure
29.30 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
6:30 AM
Sunset
7:29 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Cass County is currently clear at 26°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1700 J/kg) — isolated convective development possible. Sunrise: 6:30AM · Sunset: 7:29PM.

Alerts

Extreme Heat Warning
Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, McLean, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Champaign, IL, Vermilion, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Edgar, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL
Expires 7:00 PM
Heat Advisory
Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, McLean, IL, Schuyler, IL, Mason, IL, Logan, IL, De Witt, IL, Piatt, IL, Champaign, IL, Vermilion, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Douglas, IL, Coles, IL, Edgar, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL
Expires 7:00 PM
51 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
5%
2 AM
26°
5%
3 AM
25°
3%
4 AM
25°
3%
5 AM
22°
3%
6 AM
22°
3%
7 AM
24°
3%
8 AM
26°
7%
9 AM
29°
7%
10 AM
31°
7%
11 AM
32°
8%
12 PM
33°
8%
1 PM
36°
8%
2 PM
36°
8%
3 PM
36°
8%
4 PM
35°
8%
5 PM
35°
8%
6 PM
34°
3%
7 PM
33°
3%
8 PM
31°
3%
9 PM
28°
3%
10 PM
28°
3%
11 PM
28°
3%
12 AM
27°
3%
7-Day Forecast
Today
37° 23°
Mostly Clear.
Fri
40° 23°
Clear.
Sat
40° 23°
Mostly Clear.
Sun
34° 19°
Fog.
Mon
36° 14°
Clear.
Tue
41° 18°
Clear with a 22% chance of rain.
Wed
44° 23°
Clear with a 31% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 26° Clear 5% 7 mph S 66%
2 AM 26° Clear 5% 8 mph S 63%
3 AM 25° Clear 3% 8 mph SSW 66%
4 AM 25° Clear 3% 8 mph SSW 68%
5 AM 22° Clear 3% 8 mph SSW 71%
6 AM 22° Clear 3% 8 mph SSW 73%
7 AM 24° Clear 3% 8 mph SSW 70%
8 AM 26° Clear 7% 10 mph SW 63%
9 AM 29° Clear 7% 11 mph SW 56%
10 AM 31° Clear 7% 10 mph SW 51%
11 AM 32° Clear 8% 9 mph SW 47%
12 PM 33° Clear 8% 9 mph WSW 43%
1 PM 36° Mostly Clear 8% 8 mph SW 42%
2 PM 36° Partly Cloudy 8% 7 mph SW 42%
3 PM 36° Partly Cloudy 8% 7 mph SSW 41%
4 PM 35° Partly Cloudy 8% 7 mph S 43%
5 PM 35° Mostly Clear 8% 7 mph S 47%
6 PM 34° Clear 3% 7 mph SSE 51%
7 PM 33° Clear 3% 7 mph SSE 54%
8 PM 31° Clear 3% 7 mph S 56%
9 PM 28° Clear 3% 8 mph S 57%
10 PM 28° Clear 3% 8 mph S 59%
11 PM 28° Clear 3% 7 mph S 60%
12 AM 27° Clear 3% 7 mph S 62%
15-Day Forecast
Today
9/3
Mostly Clear
8%
23°
37°
Fri
9/4
Clear
12%
23°
40°
Sat
9/5
Mostly Clear
14%
23°
40°
Sun
9/6
Fog
16%
19°
34°
Mon
9/7
Clear
16%
14°
36°
Tue
9/8
Clear
22%
18°
41°
Wed
9/9
Clear
31%
23°
44°
Thu
9/10
Drizzle
68%
21°
41°
Fri
9/11
Drizzle
68%
20°
40°
Sat
9/12
Clear
66%
21°
39°
Sun
9/13
Drizzle
60%
20°
34°
Mon
9/14
Drizzle
60%
20°
35°
Tue
9/15
Drizzle
60%
18°
33°
Wed
9/16
Drizzle
60%
17°
32°
Thu
9/17
Drizzle
90%
17°
31°
51
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
51 AQI 9.2 µg/m³
O3
Ground-level ozone
38 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 51 Moderate 38 51
Fri 38 Good 38 35
Sat 40 Good 40 36
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Thu Sep 3, 05:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE118 J/kg
MLCAPE333 J/kg
MUCAPE706 J/kg
SBCIN-577 J/kg
MLCIN-250 J/kg
Lifted Index-0.8
Kinematics
0–6 km Shear18 kt
0–1 km Shear12 kt
Eff. Shear15 kt
0–1 km SRH72
0–3 km SRH95
Eff. SRH37
Storm Motion310° @ 14 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index27.2
Thermo & Levels
PWAT1.32 in
0–3 km LR5.5 °C/km
700–500 LR5.7 °C/km
Total Totals46.6
LCL903 hPa
LFC539 hPa
EL281 hPa
Freezing Lvl16,040 ft