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: 4:45 AM CDT  ·  Refresh
23°C
Feels like 27°
Mostly Clear
▲ 35°  /  ▼ 22°
Wind
4 mph NE
Humidity
89%
Dew Point
22°
Pressure
29.52 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
12%
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 mostly clear at 23°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2080 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
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
22%
5 AM
22°
28%
6 AM
21°
30%
7 AM
22°
29%
8 AM
23°
23%
9 AM
26°
23%
10 AM
27°
23%
11 AM
29°
23%
12 PM
32°
17%
1 PM
34°
23%
2 PM
35°
23%
3 PM
35°
26%
4 PM
34°
35%
5 PM
34°
35%
6 PM
32°
30%
7 PM
30°
30%
8 PM
29°
35%
9 PM
27°
35%
10 PM
27°
24%
11 PM
26°
25%
12 AM
26°
25%
1 AM
26°
25%
2 AM
25°
26%
3 AM
25°
26%
7-Day Forecast
Today
35° 22°
Mostly Clear with a 35% chance of rain.
Sat
36° 22°
Overcast with a 29% chance of rain.
Sun
34° 21°
Overcast with a 76% chance of rain.
Mon
28° 16°
Drizzle, 70% chance.
Tue
21° 11°
Clear.
Wed
24° 8°
Clear.
Thu
27° 11°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Clear 22% 4 mph NE 89%
5 AM 22° Mostly Clear 28% 5 mph NE 86%
6 AM 21° Partly Cloudy 30% 6 mph NE 86%
7 AM 22° Partly Cloudy 29% 6 mph ENE 84%
8 AM 23° Partly Cloudy 23% 7 mph ENE 81%
9 AM 26° Mostly Clear 23% 7 mph E 78%
10 AM 27° Clear 23% 6 mph E 68%
11 AM 29° Clear 23% 5 mph E 61%
12 PM 32° Clear 17% 4 mph E 54%
1 PM 34° Clear 23% 4 mph ESE 50%
2 PM 35° Clear 23% 3 mph SE 49%
3 PM 35° Mostly Clear 26% 3 mph SE 48%
4 PM 34° Mostly Clear 35% 3 mph ESE 51%
5 PM 34° Rain 35% 3 mph E 56%
6 PM 32° Thunderstorm 30% 4 mph ENE 62%
7 PM 30° Thunderstorm 30% 5 mph ENE 67%
8 PM 29° Partly Cloudy 35% 6 mph ESE 71%
9 PM 27° Partly Cloudy 35% 7 mph ESE 74%
10 PM 27° Mostly Clear 24% 7 mph ESE 78%
11 PM 26° Mostly Clear 25% 7 mph ESE 82%
12 AM 26° Mostly Clear 25% 6 mph SE 85%
1 AM 26° Mostly Clear 25% 6 mph SE 86%
2 AM 25° Mostly Clear 26% 6 mph SE 87%
3 AM 25° Mostly Clear 26% 6 mph SE 88%
15-Day Forecast
Today
9/18
Mostly Clear
35%
22°
35°
Sat
9/19
Overcast
29%
22°
36°
Sun
9/20
Overcast
76%
21°
34°
Mon
9/21
Drizzle
70%
16°
28°
Tue
9/22
Clear
8%
11°
21°
Wed
9/23
Clear
3%
8°
24°
Thu
9/24
Clear
17%
11°
27°
Fri
9/25
Clear
18%
10°
27°
Sat
9/26
Clear
44%
11°
28°
Sun
9/27
Drizzle
60%
14°
28°
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°
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
43 AQI 47 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 43 52
Sat 67 Moderate 67 51
Sun 54 Moderate 46 54
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, 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
SBCAPE376 J/kg
MLCAPE94 J/kg
MUCAPE582 J/kg
SBCIN-364 J/kg
MLCIN-269 J/kg
Lifted Index-1.4
Kinematics
0–6 km Shear20 kt
0–1 km Shear15 kt
Eff. Shear8 kt
0–1 km SRH59
0–3 km SRH34
Eff. SRH-5
Storm Motion323° @ 19 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.6
Thermo & Levels
PWAT1.68 in
0–3 km LR4.8 °C/km
700–500 LR5.4 °C/km
Total Totals46.7
LCL975 hPa
LFC719 hPa
EL255 hPa
Freezing Lvl15,187 ft