Flood Watch 9:00 AM Flood Watch 4:00 PM Flood Warning — Des Moines County, IA, Louisa County, IA, Henderson County, IL, Mercer County, IL 7:00 PM

Mercer County, Illinois, United States

Last updated: 8:30 PM CDT  ·  Refresh
58°F
Feels like 54°
Partly Cloudy
▲ 64°  /  ▼ 50°
Wind
8 mph ENE
Humidity
83%
Dew Point
51°
Pressure
29.53 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
31%
Sunrise
6:50 AM
Sunset
6:59 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Mercer County is currently partly cloudy at 58°F. Dry conditions are expected through the next 24 hours. Sunrise: 6:50AM · Sunset: 6:59PM.

Alerts

Flood Watch
Expires 9:00 AM
Flood Watch
Expires 4:00 PM
Flood Warning
Des Moines County, IA, Louisa County, IA, Henderson County, IL, Mercer County, IL
Expires 7:00 PM
20 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
58°
11%
9 PM
56°
3%
10 PM
55°
3%
11 PM
54°
3%
12 AM
54°
3%
1 AM
53°
3%
2 AM
53°
3%
3 AM
53°
3%
4 AM
52°
3%
5 AM
51°
3%
6 AM
52°
3%
7 AM
53°
3%
8 AM
56°
3%
9 AM
58°
3%
10 AM
60°
14%
11 AM
62°
14%
12 PM
64°
14%
1 PM
67°
14%
2 PM
67°
15%
3 PM
70°
15%
4 PM
69°
3%
5 PM
67°
3%
6 PM
66°
3%
7 PM
65°
3%
7-Day Forecast
Tonight
64° 50°
Partly Cloudy.
Wed
70° 50°
Partly Cloudy.
Thu
71° 52°
Mostly Cloudy.
Fri
71° 60°
Overcast with a 21% chance of rain.
Sat
67° 56°
Clear with a 35% chance of rain.
Sun
73° 55°
Clear with a 35% chance of rain.
Mon
72° 55°
Clear with a 31% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 58° Partly Cloudy 11% 8 mph ENE 83%
9 PM 56° Mostly Clear 3% 9 mph ENE 85%
10 PM 55° Partly Cloudy 3% 8 mph NE 86%
11 PM 54° Mostly Clear 3% 8 mph NE 87%
12 AM 54° Mostly Clear 3% 7 mph NE 88%
1 AM 53° Mostly Clear 3% 7 mph NE 88%
2 AM 53° Mostly Clear 3% 6 mph NE 87%
3 AM 53° Clear 3% 7 mph NE 87%
4 AM 52° Clear 3% 7 mph NE 88%
5 AM 51° Mostly Clear 3% 7 mph NE 88%
6 AM 52° Partly Cloudy 3% 7 mph NE 89%
7 AM 53° Partly Cloudy 3% 7 mph NE 88%
8 AM 56° Partly Cloudy 3% 8 mph NE 85%
9 AM 58° Partly Cloudy 3% 9 mph NE 82%
10 AM 60° Partly Cloudy 14% 9 mph NE 79%
11 AM 62° Mostly Cloudy 14% 9 mph ENE 76%
12 PM 64° Mostly Cloudy 14% 9 mph ENE 73%
1 PM 67° Mostly Cloudy 14% 9 mph NE 71%
2 PM 67° Mostly Cloudy 15% 9 mph NE 70%
3 PM 70° Mostly Cloudy 15% 9 mph NE 69%
4 PM 69° Mostly Cloudy 3% 9 mph NE 70%
5 PM 67° Mostly Cloudy 3% 9 mph NE 73%
6 PM 66° Mostly Cloudy 3% 9 mph ENE 75%
7 PM 65° Mostly Cloudy 3% 9 mph ENE 78%
15-Day Forecast
Today
9/22
Partly Cloudy
11%
50°
64°
Wed
9/23
Partly Cloudy
15%
50°
70°
Thu
9/24
Mostly Cloudy
8%
52°
71°
Fri
9/25
Overcast
21%
60°
71°
Sat
9/26
Clear
35%
56°
67°
Sun
9/27
Clear
35%
55°
73°
Mon
9/28
Clear
31%
55°
72°
Tue
9/29
Rain
82%
57°
75°
Wed
9/30
Rain
69%
53°
70°
Thu
10/1
Drizzle
44%
51°
68°
Fri
10/2
Drizzle
60%
49°
70°
Sat
10/3
Drizzle
60%
55°
73°
Sun
10/4
Drizzle
60%
51°
68°
Mon
10/5
Drizzle
60%
50°
68°
Tue
10/6
Drizzle
60%
51°
70°
20
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
12 AQI 2.2 µg/m³
O3
Ground-level ozone
Dominant
20 AQI 23 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 20 Good 20 12
Thu 27 Good 27 23
Fri 25 Good 25 18
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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Tue Sep 22, 23:00'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
SBCAPE0 J/kg
MLCAPE7 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index10.2
Kinematics
0–6 km Shear15 kt
0–1 km Shear13 kt
Eff. Shear—
0–1 km SRH-37
0–3 km SRH-7
Eff. SRH—
Storm Motion33° @ 21 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index17.1
Thermo & Levels
PWAT1.05 in
0–3 km LR4.1 °C/km
700–500 LR5.4 °C/km
Total Totals32.3
LCL949 hPa
LFC—
EL—
Freezing Lvl11,079 ft