Heat Advisory — Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Marion, IL, Adams, IL, Brown, IL, Pike, IL, Calhoun, IL, Jersey, IL, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Audrain, MO, Lincoln, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO 8:00 PM

Calhoun County, Illinois, United States

Last updated: 5:10 AM CDT  ·  Refresh
26°C
Feels like 28°
Mostly Clear
▲ 35°  /  ▼ 24°
Wind
7 mph SSW
Humidity
78%
Dew Point
22°
Pressure
29.33 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
18%
Sunrise
6:12 AM
Sunset
8:02 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Calhoun County is currently mostly clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2959 J/kg) — isolated convective development possible. Sunrise: 6:12AM · Sunset: 8:02PM.

Alerts

Heat Advisory
Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Marion, IL, Adams, IL, Brown, IL, Pike, IL, Calhoun, IL, Jersey, IL, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Audrain, MO, Lincoln, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO
Expires 8:00 PM
37 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
6%
6 AM
24°
23%
7 AM
24°
21%
8 AM
26°
21%
9 AM
27°
21%
10 AM
29°
20%
11 AM
30°
20%
12 PM
31°
14%
1 PM
34°
3%
2 PM
34°
9%
3 PM
34°
17%
4 PM
34°
28%
5 PM
35°
28%
6 PM
34°
29%
7 PM
33°
29%
8 PM
32°
30%
9 PM
31°
30%
10 PM
29°
22%
11 PM
29°
22%
12 AM
27°
23%
1 AM
27°
23%
2 AM
27°
24%
3 AM
27°
24%
4 AM
26°
26%
7-Day Forecast
Today
35° 24°
Partly Cloudy with a 30% chance of rain.
Wed
36° 24°
Partly Cloudy with a 56% chance of rain.
Thu
34° 24°
Partly Cloudy with a 59% chance of rain.
Fri
32° 21°
Partly Cloudy with a 46% chance of rain.
Sat
38° 23°
Partly Cloudy.
Sun
37° 21°
Partly Cloudy with a 49% chance of rain.
Mon
32° 19°
Clear with a 28% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 26° Mostly Clear 6% 7 mph SSW 78%
6 AM 24° Mostly Clear 23% 7 mph SSW 74%
7 AM 24° Mostly Clear 21% 7 mph SW 73%
8 AM 26° Partly Cloudy 21% 9 mph SW 67%
9 AM 27° Partly Cloudy 21% 10 mph SW 61%
10 AM 29° Partly Cloudy 20% 11 mph WSW 56%
11 AM 30° Partly Cloudy 20% 12 mph SW 53%
12 PM 31° Partly Cloudy 14% 12 mph SW 49%
1 PM 34° Partly Cloudy 3% 13 mph SW 45%
2 PM 34° Mostly Clear 9% 13 mph SW 43%
3 PM 34° Mostly Clear 17% 12 mph SW 42%
4 PM 34° Mostly Clear 28% 12 mph SW 42%
5 PM 35° Partly Cloudy 28% 10 mph SW 45%
6 PM 34° Partly Cloudy 29% 9 mph SW 48%
7 PM 33° Partly Cloudy 29% 7 mph SW 52%
8 PM 32° Partly Cloudy 30% 6 mph SW 55%
9 PM 31° Partly Cloudy 30% 6 mph SW 58%
10 PM 29° Partly Cloudy 22% 6 mph SW 61%
11 PM 29° Partly Cloudy 22% 6 mph SSW 66%
12 AM 27° Partly Cloudy 23% 6 mph SSW 70%
1 AM 27° Mostly Clear 23% 6 mph SSW 74%
2 AM 27° Partly Cloudy 24% 6 mph SSW 75%
3 AM 27° Partly Cloudy 24% 6 mph SSW 76%
4 AM 26° Mostly Clear 26% 5 mph SSW 76%
15-Day Forecast
Today
8/11
Partly Cloudy
30%
24°
35°
Wed
8/12
Partly Cloudy
56%
24°
36°
Thu
8/13
Partly Cloudy
59%
24°
34°
Fri
8/14
Partly Cloudy
46%
21°
32°
Sat
8/15
Partly Cloudy
15%
23°
38°
Sun
8/16
Partly Cloudy
49%
21°
37°
Mon
8/17
Clear
28%
19°
32°
Tue
8/18
Rain
53%
20°
37°
Wed
8/19
Mostly Cloudy
35%
23°
37°
Thu
8/20
Mostly Clear
35%
22°
40°
Fri
8/21
Clear
60%
20°
40°
Sat
8/22
Drizzle
60%
20°
34°
Sun
8/23
Clear
60%
20°
34°
Mon
8/24
Drizzle
60%
19°
32°
Tue
8/25
Drizzle
60%
19°
32°
37
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
37 AQI 6.6 µg/m³
O3
Ground-level ozone
36 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 37 Good 36 37
Wed 38 Good 38 22
Thu 37 Good 37 30
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 Tue Aug 11, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1652 J/kg
MLCAPE1664 J/kg
MUCAPE1686 J/kg
SBCIN-544 J/kg
MLCIN0 J/kg
Lifted Index-5.8
Kinematics
0–6 km Shear17 kt
0–1 km Shear21 kt
Eff. Shear13 kt
0–1 km SRH154
0–3 km SRH135
Eff. SRH-5
Storm Motion313° @ 17 kt
0–1 km EHI1.6
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index24.6
Thermo & Levels
PWAT1.41 in
0–3 km LR4.1 °C/km
700–500 LR8.0 °C/km
Total Totals52.5
LCL943 hPa
LFC654 hPa
EL185 hPa
Freezing Lvl14,646 ft