Flood Warning — Cass County, IL, Fulton County, IL, Mason County, IL

Mason County, Illinois, United States

Last updated: 12:20 PM CDT  ·  Refresh
26°C
Feels like 26°
Clear
▲ 26°  /  ▼ 17°
Wind
9 mph NNW
Humidity
68%
Dew Point
18°
Pressure
29.51 inHg
Visibility
10 mi
UV Index
9.1
Cloud Cover
7%
Sunrise
6:12 AM
Sunset
7:53 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Mason County is currently clear at 25°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:12AM · Sunset: 7:53PM.

Alerts

Flood Warning
Cass County, IL, Fulton County, IL, Mason County, IL
Expires
31 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
4%
1 PM
24°
4%
2 PM
24°
4%
3 PM
24°
4%
4 PM
23°
3%
5 PM
26°
3%
6 PM
25°
3%
7 PM
24°
3%
8 PM
22°
3%
9 PM
22°
3%
10 PM
21°
3%
11 PM
20°
3%
12 AM
19°
3%
1 AM
19°
3%
2 AM
18°
3%
3 AM
18°
3%
4 AM
18°
3%
5 AM
17°
3%
6 AM
17°
3%
7 AM
17°
3%
8 AM
18°
3%
9 AM
20°
3%
10 AM
21°
3%
11 AM
22°
3%
7-Day Forecast
Today
26° 17°
Partly Cloudy.
Tue
27° 17°
Partly Cloudy with a 57% chance of rain.
Wed
26° 18°
Fog with a 58% chance of rain.
Thu
24° 17°
Mostly Clear with a 33% chance of rain.
Fri
25° 16°
Clear with a 30% chance of rain.
Sat
26° 16°
Clear with a 30% chance of rain.
Sun
26° 17°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 26° Clear 4% 9 mph NNW 68%
1 PM 24° Clear 4% 9 mph NNW 65%
2 PM 24° Mostly Clear 4% 9 mph NNW 65%
3 PM 24° Partly Cloudy 4% 9 mph NNW 64%
4 PM 23° Partly Cloudy 3% 8 mph NNW 65%
5 PM 26° Mostly Cloudy 3% 7 mph NNW 68%
6 PM 25° Mostly Cloudy 3% 5 mph NNW 72%
7 PM 24° Partly Cloudy 3% 4 mph NNW 76%
8 PM 22° Partly Cloudy 3% 4 mph NW 79%
9 PM 22° Partly Cloudy 3% 3 mph WNW 82%
10 PM 21° Mostly Clear 3% 3 mph W 84%
11 PM 20° Mostly Clear 3% 3 mph WSW 87%
12 AM 19° Mostly Clear 3% 4 mph SSW 89%
1 AM 19° Mostly Clear 3% 4 mph SSW 92%
2 AM 18° Mostly Clear 3% 4 mph SSW 92%
3 AM 18° Mostly Clear 3% 4 mph SSW 93%
4 AM 18° Partly Cloudy 3% 5 mph SSW 93%
5 AM 17° Partly Cloudy 3% 4 mph SSW 94%
6 AM 17° Haze 3% 4 mph SSW 94%
7 AM 17° Haze 3% 4 mph SSW 93%
8 AM 18° Mostly Cloudy 3% 5 mph SSW 88%
9 AM 20° Mostly Cloudy 3% 6 mph SSW 84%
10 AM 21° Mostly Cloudy 3% 6 mph SW 80%
11 AM 22° Mostly Cloudy 3% 6 mph SW 78%
15-Day Forecast
Today
8/17
Partly Cloudy
4%
17°
26°
Tue
8/18
Partly Cloudy
57%
17°
27°
Wed
8/19
Fog
58%
18°
26°
Thu
8/20
Mostly Clear
33%
17°
24°
Fri
8/21
Clear
30%
16°
25°
Sat
8/22
Clear
30%
16°
26°
Sun
8/23
Clear
8%
17°
26°
Mon
8/24
Drizzle
42%
18°
26°
Tue
8/25
Drizzle
44%
18°
26°
Wed
8/26
Clear
44%
18°
24°
Thu
8/27
Clear
31%
17°
24°
Fri
8/28
Drizzle
60%
17°
23°
Sat
8/29
Drizzle
60%
17°
23°
Sun
8/30
Drizzle
60%
17°
24°
Mon
8/31
Drizzle
60%
17°
24°
31
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
29 AQI 5.4 µg/m³
O3
Ground-level ozone
Dominant
31 AQI 33 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 31 Good 31 29
Wed 39 Good 30 39
Thu 33 Good 33 24
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 Mon Aug 17, 16:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE42 J/kg
MLCAPE9 J/kg
MUCAPE42 J/kg
SBCIN-28 J/kg
MLCIN-11 J/kg
Lifted Index1.5
Kinematics
0–6 km Shear20 kt
0–1 km Shear5 kt
Eff. Shear—
0–1 km SRH5
0–3 km SRH55
Eff. SRH—
Storm Motion325° @ 29 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index4.5
Thermo & Levels
PWAT1.12 in
0–3 km LR4.9 °C/km
700–500 LR6.1 °C/km
Total Totals36.2
LCL903 hPa
LFC878 hPa
EL775 hPa
Freezing Lvl15,161 ft