Heat Advisory — Fulton, IL, Schuyler, IL, Mason, IL, Logan, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Coles, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL 8:00 PM

Mason County, Illinois, United States

Last updated: 6:04 AM CDT  ·  Refresh
24°C
Feels like 27°
Partly Cloudy
▲ 36°  /  ▼ 22°
Wind
7 mph SSW
Humidity
81%
Dew Point
22°
Pressure
29.38 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
34%
Sunrise
6:06 AM
Sunset
8:01 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Mason County is currently partly cloudy at 25°C. Precipitation is likely — peak probability 50% around 6 AM. Atmospheric instability is elevated (CAPE up to 3704 J/kg) — isolated convective development possible. Sunrise: 6:06AM · Sunset: 8:01PM.

Alerts

Heat Advisory
Fulton, IL, Schuyler, IL, Mason, IL, Logan, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL, Macon, IL, Moultrie, IL, Coles, IL, Shelby, IL, Cumberland, IL, Clark, IL, Effingham, IL, Jasper, IL, Crawford, IL, Clay, IL, Richland, IL, Lawrence, IL
Expires 8:00 PM
51 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
11%
7 AM
24°
27%
8 AM
26°
27%
9 AM
28°
35%
10 AM
29°
25%
11 AM
31°
25%
12 PM
32°
28%
1 PM
32°
9%
2 PM
32°
14%
3 PM
33°
18%
4 PM
33°
30%
5 PM
34°
20%
6 PM
33°
20%
7 PM
32°
23%
8 PM
30°
23%
9 PM
28°
21%
10 PM
27°
16%
11 PM
26°
16%
12 AM
26°
19%
1 AM
25°
19%
2 AM
25°
29%
3 AM
24°
29%
4 AM
24°
39%
5 AM
23°
47%
7-Day Forecast
Today
36° 22°
Partly Cloudy with a 35% chance of rain.
Wed
31° 22°
Mostly Cloudy with a 61% chance of rain.
Thu
32° 22°
Partly Cloudy with a 76% chance of rain.
Fri
28° 21°
Overcast with a 83% chance of rain.
Sat
33° 21°
Mostly Clear with a 57% chance of rain.
Sun
32° 19°
Drizzle, 46% chance.
Mon
29° 18°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 24° Partly Cloudy 11% 7 mph SSW 81%
7 AM 24° Mostly Cloudy 27% 8 mph SSW 76%
8 AM 26° Partly Cloudy 27% 9 mph SW 70%
9 AM 28° Mostly Cloudy 35% 10 mph SW 65%
10 AM 29° Partly Cloudy 25% 11 mph SW 61%
11 AM 31° Mostly Cloudy 25% 11 mph SW 56%
12 PM 32° Mostly Cloudy 28% 12 mph SW 52%
1 PM 32° Mostly Cloudy 9% 13 mph SW 48%
2 PM 32° Partly Cloudy 14% 13 mph WSW 48%
3 PM 33° Partly Cloudy 18% 13 mph WSW 48%
4 PM 33° Partly Cloudy 30% 13 mph WSW 49%
5 PM 34° Partly Cloudy 20% 11 mph WSW 50%
6 PM 33° Partly Cloudy 20% 9 mph WSW 52%
7 PM 32° Partly Cloudy 23% 7 mph WSW 57%
8 PM 30° Partly Cloudy 23% 5 mph SW 65%
9 PM 28° Partly Cloudy 21% 6 mph SSW 72%
10 PM 27° Partly Cloudy 16% 7 mph SSE 79%
11 PM 26° Partly Cloudy 16% 6 mph SSE 83%
12 AM 26° Partly Cloudy 19% 5 mph S 87%
1 AM 25° Partly Cloudy 19% 5 mph SSW 90%
2 AM 25° Partly Cloudy 29% 5 mph S 90%
3 AM 24° Partly Cloudy 29% 5 mph S 90%
4 AM 24° Mostly Cloudy 39% 5 mph S 90%
5 AM 23° Partly Cloudy 47% 5 mph SE 90%
15-Day Forecast
Today
8/11
Partly Cloudy
35%
22°
36°
Wed
8/12
Mostly Cloudy
61%
22°
31°
Thu
8/13
Partly Cloudy
76%
22°
32°
Fri
8/14
Overcast
83%
21°
28°
Sat
8/15
Mostly Clear
57%
21°
33°
Sun
8/16
Drizzle
46%
19°
32°
Mon
8/17
Mostly Clear
15%
18°
29°
Tue
8/18
Mostly Clear
34%
19°
32°
Wed
8/19
Thunderstorm
35%
22°
34°
Thu
8/20
Mostly Clear
35%
21°
36°
Fri
8/21
Drizzle
60%
18°
35°
Sat
8/22
Drizzle
60%
19°
32°
Sun
8/23
Drizzle
60%
18°
31°
Mon
8/24
Drizzle
60%
18°
29°
Tue
8/25
Drizzle
60%
17°
29°
51
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
51 AQI 9.3 µg/m³
O3
Ground-level ozone
40 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 51 Moderate 40 51
Wed 35 Good 34 35
Thu 39 Good 39 34
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 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1878 J/kg
MLCAPE1784 J/kg
MUCAPE1989 J/kg
SBCIN-418 J/kg
MLCIN0 J/kg
Lifted Index-6.1
Kinematics
0–6 km Shear20 kt
0–1 km Shear26 kt
Eff. Shear14 kt
0–1 km SRH189
0–3 km SRH181
Eff. SRH38
Storm Motion310° @ 21 kt
0–1 km EHI2.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.3
Thermo & Levels
PWAT1.68 in
0–3 km LR4.3 °C/km
700–500 LR7.6 °C/km
Total Totals53.4
LCL962 hPa
LFC677 hPa
EL178 hPa
Freezing Lvl14,577 ft