Heat Advisory — Greene, IL, Macoupin, IL, Montgomery, IL, Fayette, IL, Calhoun, IL, Jersey, IL, Boone, MO, Callaway, MO, Montgomery, MO, Lincoln, MO 8:00 PM

Calhoun County, Illinois, United States

Last updated: 6:43 AM CDT  ·  Refresh
23°C
Feels like 26°
Partly Cloudy
▲ 35°  /  ▼ 22°
Wind
4 mph NE
Humidity
87%
Dew Point
21°
Pressure
29.54 inHg
Visibility
8 mi
UV Index
0.0
Cloud Cover
31%
Sunrise
6:46 AM
Sunset
7:05 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Calhoun County is currently partly cloudy at 23°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1901 J/kg) — isolated convective development possible. Sunrise: 6:46AM · Sunset: 7:05PM.

Alerts

Heat Advisory
Greene, IL, Macoupin, IL, Montgomery, IL, Fayette, IL, Calhoun, IL, Jersey, IL, Boone, MO, Callaway, MO, Montgomery, MO, Lincoln, MO
Expires 8:00 PM
48 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
26%
7 AM
22°
31%
8 AM
23°
29%
9 AM
26°
21%
10 AM
28°
21%
11 AM
30°
21%
12 PM
32°
15%
1 PM
34°
29%
2 PM
35°
29%
3 PM
35°
32%
4 PM
34°
41%
5 PM
33°
42%
6 PM
31°
42%
7 PM
29°
42%
8 PM
28°
42%
9 PM
27°
43%
10 PM
27°
32%
11 PM
26°
31%
12 AM
26°
31%
1 AM
25°
23%
2 AM
25°
23%
3 AM
24°
23%
4 AM
24°
24%
5 AM
23°
24%
7-Day Forecast
Today
35° 22°
Thunderstorm, 43% chance.
Sat
36° 22°
Overcast with a 31% chance of rain.
Sun
34° 20°
Overcast with a 66% chance of rain.
Mon
27° 17°
Rain, 72% chance.
Tue
23° 12°
Partly Cloudy with a 27% chance of rain.
Wed
26° 12°
Mostly Cloudy.
Thu
26° 12°
Overcast.
TimeTempConditionsPrecipWindHumidity
Now 23° Partly Cloudy 26% 4 mph NE 87%
7 AM 22° Mostly Clear 31% 6 mph ENE 81%
8 AM 23° Mostly Clear 29% 6 mph ENE 78%
9 AM 26° Mostly Clear 21% 6 mph E 75%
10 AM 28° Clear 21% 5 mph E 66%
11 AM 30° Clear 21% 4 mph E 58%
12 PM 32° Clear 15% 4 mph ESE 51%
1 PM 34° Clear 29% 3 mph SE 48%
2 PM 35° Clear 29% 3 mph SE 46%
3 PM 35° Mostly Clear 32% 2 mph SSE 46%
4 PM 34° Mostly Clear 41% 3 mph SSE 50%
5 PM 33° Partly Cloudy 42% 4 mph ESE 56%
6 PM 31° Thunderstorm 42% 4 mph ENE 64%
7 PM 29° Thunderstorm 42% 5 mph E 68%
8 PM 28° Drizzle 42% 5 mph ESE 71%
9 PM 27° Drizzle 43% 6 mph SE 74%
10 PM 27° Mostly Clear 32% 7 mph SE 78%
11 PM 26° Mostly Clear 31% 6 mph SE 82%
12 AM 26° Mostly Clear 31% 6 mph SE 85%
1 AM 25° Mostly Clear 23% 6 mph SE 86%
2 AM 25° Mostly Clear 23% 6 mph SE 86%
3 AM 24° Mostly Clear 23% 6 mph SSE 87%
4 AM 24° Mostly Clear 24% 6 mph SSE 87%
5 AM 23° Mostly Clear 24% 6 mph SSE 86%
15-Day Forecast
Today
9/18
Thunderstorm
43%
22°
35°
Sat
9/19
Overcast
31%
22°
36°
Sun
9/20
Overcast
66%
20°
34°
Mon
9/21
Rain
72%
17°
27°
Tue
9/22
Partly Cloudy
27%
12°
23°
Wed
9/23
Mostly Cloudy
5%
12°
26°
Thu
9/24
Overcast
15%
12°
26°
Fri
9/25
Overcast
40%
13°
24°
Sat
9/26
Mostly Clear
34%
13°
25°
Sun
9/27
Drizzle
54%
14°
27°
Mon
9/28
Drizzle
60%
15°
29°
Tue
9/29
Drizzle
60%
16°
29°
Wed
9/30
Drizzle
60%
15°
29°
Thu
10/1
Clear
60%
15°
29°
Fri
10/2
Drizzle
60%
13°
27°
48
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
48 AQI 8.7 µg/m³
O3
Ground-level ozone
46 AQI 50 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 48 Good 46 48
Sun 54 Moderate 39 54
Mon 50 Good 44 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 Fri Sep 18, 10:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE169 J/kg
MLCAPE207 J/kg
MUCAPE616 J/kg
SBCIN-421 J/kg
MLCIN-327 J/kg
Lifted Index-1.1
Kinematics
0–6 km Shear19 kt
0–1 km Shear14 kt
Eff. Shear9 kt
0–1 km SRH59
0–3 km SRH21
Eff. SRH-11
Storm Motion329° @ 17 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.5
Thermo & Levels
PWAT1.71 in
0–3 km LR4.5 °C/km
700–500 LR5.7 °C/km
Total Totals49.5
LCL977 hPa
LFC692 hPa
EL366 hPa
Freezing Lvl14,596 ft