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: 6:03 AM CDT  ·  Refresh
25°C
Feels like 27°
Mostly Clear
▲ 36°  /  ▼ 24°
Wind
7 mph SSW
Humidity
77%
Dew Point
22°
Pressure
29.33 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
17%
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 3040 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
25°
6%
7 AM
24°
21%
8 AM
26°
21%
9 AM
27°
21%
10 AM
28°
20%
11 AM
30°
20%
12 PM
31°
20%
1 PM
33°
3%
2 PM
34°
9%
3 PM
34°
16%
4 PM
35°
27%
5 PM
36°
28%
6 PM
34°
28%
7 PM
33°
29%
8 PM
32°
29%
9 PM
31°
30%
10 PM
29°
22%
11 PM
28°
22%
12 AM
28°
22%
1 AM
27°
23%
2 AM
27°
23%
3 AM
26°
24%
4 AM
26°
24%
5 AM
24°
26%
7-Day Forecast
Today
36° 24°
Partly Cloudy with a 30% chance of rain.
Wed
36° 24°
Partly Cloudy with a 48% chance of rain.
Thu
34° 24°
Partly Cloudy with a 52% chance of rain.
Fri
32° 21°
Partly Cloudy with a 69% chance of rain.
Sat
38° 23°
Partly Cloudy.
Sun
37° 21°
Partly Cloudy with a 46% chance of rain.
Mon
32° 19°
Clear with a 49% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 25° Mostly Clear 6% 7 mph SSW 77%
7 AM 24° Mostly Clear 21% 7 mph SSW 73%
8 AM 26° Mostly Clear 21% 8 mph SW 67%
9 AM 27° Mostly Cloudy 21% 10 mph SW 61%
10 AM 28° Mostly Cloudy 20% 11 mph WSW 56%
11 AM 30° Mostly Cloudy 20% 12 mph WSW 53%
12 PM 31° Partly Cloudy 20% 12 mph WSW 50%
1 PM 33° Partly Cloudy 3% 13 mph SW 46%
2 PM 34° Mostly Clear 9% 13 mph SW 44%
3 PM 34° Mostly Clear 16% 12 mph SW 42%
4 PM 35° Partly Cloudy 27% 12 mph SW 41%
5 PM 36° Partly Cloudy 28% 11 mph SW 44%
6 PM 34° Partly Cloudy 28% 9 mph SW 48%
7 PM 33° Mostly Cloudy 29% 7 mph SW 52%
8 PM 32° Partly Cloudy 29% 6 mph SW 55%
9 PM 31° Partly Cloudy 30% 6 mph SSW 58%
10 PM 29° Partly Cloudy 22% 6 mph SSW 60%
11 PM 28° Partly Cloudy 22% 6 mph SSW 65%
12 AM 28° Partly Cloudy 22% 6 mph S 70%
1 AM 27° Mostly Clear 23% 6 mph S 74%
2 AM 27° Partly Cloudy 23% 6 mph S 75%
3 AM 26° Partly Cloudy 24% 6 mph SSW 76%
4 AM 26° Partly Cloudy 24% 5 mph SSW 76%
5 AM 24° Mostly Clear 26% 5 mph SSW 76%
15-Day Forecast
Today
8/11
Partly Cloudy
30%
24°
36°
Wed
8/12
Partly Cloudy
48%
24°
36°
Thu
8/13
Partly Cloudy
52%
24°
34°
Fri
8/14
Partly Cloudy
69%
21°
32°
Sat
8/15
Partly Cloudy
15%
23°
38°
Sun
8/16
Partly Cloudy
46%
21°
37°
Mon
8/17
Clear
49%
19°
32°
Tue
8/18
Rain
53%
19°
37°
Wed
8/19
Mostly Cloudy
35%
23°
37°
Thu
8/20
Mostly Clear
35%
22°
40°
Fri
8/21
Clear
25%
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, 09:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1407 J/kg
MLCAPE1432 J/kg
MUCAPE1467 J/kg
SBCIN-520 J/kg
MLCIN0 J/kg
Lifted Index-5.9
Kinematics
0–6 km Shear20 kt
0–1 km Shear19 kt
Eff. Shear10 kt
0–1 km SRH157
0–3 km SRH148
Eff. SRH-11
Storm Motion310° @ 18 kt
0–1 km EHI1.4
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index27.7
Thermo & Levels
PWAT1.53 in
0–3 km LR4.1 °C/km
700–500 LR8.3 °C/km
Total Totals54.6
LCL942 hPa
LFC654 hPa
EL190 hPa
Freezing Lvl14,488 ft