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

Clark County, Illinois, United States

Last updated: 1:52 AM CDT  ·  Refresh
25°C
Feels like 27°
Clear
▲ 37°  /  ▼ 22°
Wind
5 mph SSW
Humidity
72%
Dew Point
20°
Pressure
29.35 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
2%
Sunrise
6:21 AM
Sunset
7:18 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Clark County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1312 J/kg) — isolated convective development possible. Sunrise: 6:21AM · Sunset: 7:18PM.

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
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
8%
2 AM
25°
8%
3 AM
24°
3%
4 AM
22°
3%
5 AM
22°
3%
6 AM
22°
3%
7 AM
24°
3%
8 AM
28°
3%
9 AM
30°
3%
10 AM
32°
3%
11 AM
33°
3%
12 PM
35°
3%
1 PM
36°
3%
2 PM
36°
3%
3 PM
36°
3%
4 PM
37°
3%
5 PM
36°
3%
6 PM
34°
3%
7 PM
33°
3%
8 PM
29°
3%
9 PM
28°
3%
10 PM
28°
3%
11 PM
27°
3%
12 AM
27°
3%
7-Day Forecast
Today
37° 22°
Clear.
Fri
39° 22°
Clear with a 31% chance of rain.
Sat
39° 23°
Mostly Clear.
Sun
31° 17°
Fog.
Mon
33° 14°
Clear.
Tue
37° 17°
Clear.
Wed
41° 23°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 25° Clear 8% 5 mph SSW 72%
2 AM 25° Clear 8% 5 mph SW 70%
3 AM 24° Clear 3% 6 mph SW 73%
4 AM 22° Clear 3% 6 mph SSW 76%
5 AM 22° Clear 3% 5 mph SSW 78%
6 AM 22° Clear 3% 5 mph SSW 81%
7 AM 24° Clear 3% 6 mph SSW 77%
8 AM 28° Clear 3% 7 mph SW 70%
9 AM 30° Clear 3% 8 mph SW 64%
10 AM 32° Clear 3% 8 mph SW 58%
11 AM 33° Clear 3% 9 mph SW 52%
12 PM 35° Clear 3% 9 mph WSW 47%
1 PM 36° Clear 3% 9 mph WSW 46%
2 PM 36° Clear 3% 8 mph SW 45%
3 PM 36° Clear 3% 7 mph SW 44%
4 PM 37° Clear 3% 6 mph SW 47%
5 PM 36° Clear 3% 5 mph SW 52%
6 PM 34° Clear 3% 4 mph SSW 56%
7 PM 33° Clear 3% 4 mph SSW 59%
8 PM 29° Clear 3% 5 mph S 61%
9 PM 28° Clear 3% 6 mph S 62%
10 PM 28° Clear 3% 6 mph S 63%
11 PM 27° Clear 3% 6 mph S 65%
12 AM 27° Clear 3% 6 mph S 66%
15-Day Forecast
Today
9/3
Clear
8%
22°
37°
Fri
9/4
Clear
31%
22°
39°
Sat
9/5
Mostly Clear
14%
23°
39°
Sun
9/6
Fog
16%
17°
31°
Mon
9/7
Clear
8%
14°
33°
Tue
9/8
Clear
17%
17°
37°
Wed
9/9
Clear
17%
23°
41°
Thu
9/10
Drizzle
68%
20°
39°
Fri
9/11
Drizzle
68%
19°
39°
Sat
9/12
Drizzle
51%
21°
39°
Sun
9/13
Drizzle
60%
19°
34°
Mon
9/14
Drizzle
60%
19°
34°
Tue
9/15
Drizzle
60%
18°
33°
Wed
9/16
Drizzle
60%
17°
32°
Thu
9/17
Drizzle
60%
16°
32°
52
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
52 AQI 9.4 µg/m³
O3
Ground-level ozone
39 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 39 52
Fri 54 Moderate 41 54
Sat 50 Good 41 50
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
SBCAPE194 J/kg
MLCAPE143 J/kg
MUCAPE338 J/kg
SBCIN-490 J/kg
MLCIN-278 J/kg
Lifted Index-1.3
Kinematics
0–6 km Shear16 kt
0–1 km Shear13 kt
Eff. Shear8 kt
0–1 km SRH35
0–3 km SRH25
Eff. SRH-16
Storm Motion320° @ 11 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index29.3
Thermo & Levels
PWAT1.50 in
0–3 km LR5.0 °C/km
700–500 LR6.1 °C/km
Total Totals46.4
LCL926 hPa
LFC565 hPa
EL300 hPa
Freezing Lvl15,794 ft