Flood Warning — Brown County, IL, Cass County, IL, Morgan County, IL, Schuyler County, IL, Fulton County, IL, Mason County, IL

Mason County, Illinois, United States

Last updated: 7:11 PM CDT  ·  Refresh
26°C
Feels like 29°
Partly Cloudy
▲ 31°  /  ▼ 19°
Wind
9 mph N
Humidity
87%
Dew Point
23°
Pressure
29.38 inHg
Visibility
10 mi
UV Index
3.2
Cloud Cover
44%
Sunrise
5:35 AM
Sunset
8:32 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Mason County is currently partly cloudy at 26°C. Precipitation is likely — peak probability 60% around 8 PM. Atmospheric instability is elevated (CAPE up to 1765 J/kg) — isolated convective development possible. Sunrise: 5:35AM · Sunset: 8:32PM.

Alerts

Flood Warning
Brown County, IL, Cass County, IL, Morgan County, IL, Schuyler County, IL, Fulton County, IL, Mason County, IL
Expires
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
41%
8 PM
26°
60%
9 PM
24°
38%
10 PM
24°
19%
11 PM
23°
19%
12 AM
23°
12%
1 AM
22°
7%
2 AM
21°
7%
3 AM
21°
8%
4 AM
21°
8%
5 AM
19°
8%
6 AM
19°
8%
7 AM
20°
7%
8 AM
21°
15%
9 AM
22°
24%
10 AM
23°
24%
11 AM
24°
24%
12 PM
25°
24%
1 PM
26°
24%
2 PM
27°
24%
3 PM
27°
24%
4 PM
27°
24%
5 PM
28°
27%
6 PM
28°
15%
7-Day Forecast
Tonight
31° 19°
Partly Cloudy with a 41% chance of rain.
Sun
28° 19°
Mostly Cloudy with a 24% chance of rain.
Mon
29° 18°
Mostly Clear.
Tue
29° 17°
Partly Cloudy.
Wed
29° 18°
Partly Cloudy.
Thu
27° 20°
Rain, 90% chance.
Fri
27° 18°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 26° Partly Cloudy 41% 9 mph N 87%
8 PM 26° Mostly Cloudy 60% 6 mph NE 90%
9 PM 24° Mostly Cloudy 38% 4 mph N 92%
10 PM 24° Overcast 19% 4 mph NW 93%
11 PM 23° Mostly Cloudy 19% 3 mph NW 94%
12 AM 23° Mostly Cloudy 12% 3 mph NW 96%
1 AM 22° Overcast 7% 3 mph NW 97%
2 AM 21° Overcast 7% 3 mph N 97%
3 AM 21° Overcast 8% 3 mph N 97%
4 AM 21° Mostly Cloudy 8% 3 mph N 97%
5 AM 19° Mostly Cloudy 8% 3 mph N 97%
6 AM 19° Mostly Cloudy 8% 4 mph N 96%
7 AM 20° Fog 7% 5 mph N 95%
8 AM 21° Mostly Cloudy 15% 4 mph N 92%
9 AM 22° Overcast 24% 5 mph N 88%
10 AM 23° Overcast 24% 6 mph N 84%
11 AM 24° Overcast 24% 5 mph N 80%
12 PM 25° Mostly Cloudy 24% 5 mph N 76%
1 PM 26° Mostly Cloudy 24% 5 mph N 74%
2 PM 27° Mostly Cloudy 24% 6 mph N 72%
3 PM 27° Mostly Cloudy 24% 6 mph N 72%
4 PM 27° Mostly Cloudy 24% 6 mph N 72%
5 PM 28° Mostly Cloudy 27% 7 mph N 74%
6 PM 28° Mostly Cloudy 15% 7 mph NNE 77%
15-Day Forecast
Today
7/4
Partly Cloudy
41%
19°
31°
Sun
7/5
Mostly Cloudy
24%
19°
28°
Mon
7/6
Mostly Clear
12%
18°
29°
Tue
7/7
Partly Cloudy
14%
17°
29°
Wed
7/8
Partly Cloudy
16%
18°
29°
Thu
7/9
Rain
90%
20°
27°
Fri
7/10
Rain
63%
18°
27°
Sat
7/11
Mostly Clear
53%
18°
26°
Sun
7/12
Drizzle
43%
16°
26°
Mon
7/13
Mostly Clear
44%
16°
27°
Tue
7/14
Drizzle
51%
17°
29°
Wed
7/15
Drizzle
60%
18°
29°
Thu
7/16
Drizzle
60%
17°
24°
Fri
7/17
Drizzle
60%
17°
25°
Sat
7/18
Drizzle
60%
18°
26°
54
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
54 AQI 11.0 µg/m³
O3
Ground-level ozone
35 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 35 54
Mon 51 Moderate 39 51
Tue 61 Moderate 39 61
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 Sat Jul 4, 22:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1717 J/kg
MLCAPE1757 J/kg
MUCAPE2378 J/kg
SBCIN-10 J/kg
MLCIN0 J/kg
Lifted Index-5.0
Kinematics
0–6 km Shear18 kt
0–1 km Shear15 kt
Eff. Shear17 kt
0–1 km SRH-106
0–3 km SRH-143
Eff. SRH-143
Storm Motion236° @ 18 kt
0–1 km EHI-1.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.7
Thermo & Levels
PWAT1.73 in
0–3 km LR6.2 °C/km
700–500 LR5.4 °C/km
Total Totals46.1
LCL945 hPa
LFC917 hPa
EL176 hPa
Freezing Lvl14,902 ft