Severe Thunderstorm Watch 10:00 PM Severe Thunderstorm Watch 10:00 PM

Lee County, Illinois, United States

Last updated: 9:11 PM CDT  ·  Refresh
21°C
Feels like 22°
Mostly Cloudy
▲ 27°  /  ▼ 15°
Wind
5 mph W
Humidity
96%
Dew Point
20°
Pressure
29.10 inHg
Visibility
7 mi
UV Index
0.0
Cloud Cover
73%
Sunrise
6:11 AM
Sunset
7:47 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lee County is currently mostly cloudy at 20°C. Precipitation is likely — peak probability 66% around 9 PM. Atmospheric instability is elevated (CAPE up to 1228 J/kg) — isolated convective development possible. Sunrise: 6:11AM · Sunset: 7:47PM.

Alerts

Severe Thunderstorm Watch
Expires 10:00 PM
Severe Thunderstorm Watch
Expires 10:00 PM
36 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
66%
10 PM
20°
40%
11 PM
19°
16%
12 AM
19°
16%
1 AM
18°
3%
2 AM
18°
3%
3 AM
17°
4%
4 AM
17°
4%
5 AM
16°
4%
6 AM
15°
5%
7 AM
16°
5%
8 AM
17°
8%
9 AM
19°
8%
10 AM
21°
17%
11 AM
22°
17%
12 PM
24°
20%
1 PM
26°
20%
2 PM
26°
20%
3 PM
26°
20%
4 PM
27°
10%
5 PM
26°
5%
6 PM
24°
5%
7 PM
23°
3%
8 PM
22°
3%
7-Day Forecast
Tonight
27° 15°
Mostly Cloudy with a 66% chance of rain.
Sat
27° 15°
Mostly Clear with a 20% chance of rain.
Sun
24° 12°
Mostly Clear.
Mon
22° 12°
Overcast with a 44% chance of rain.
Tue
24° 12°
Clear with a 64% chance of rain.
Wed
27° 16°
Clear with a 64% chance of rain.
Thu
26° 17°
Clear with a 30% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 21° Mostly Cloudy 66% 5 mph W 96%
10 PM 20° Mostly Cloudy 40% 6 mph S 96%
11 PM 19° Partly Cloudy 16% 4 mph W 96%
12 AM 19° Mostly Clear 16% 5 mph W 95%
1 AM 18° Mostly Clear 3% 6 mph WNW 95%
2 AM 18° Mostly Clear 3% 7 mph WNW 94%
3 AM 17° Partly Cloudy 4% 7 mph NW 94%
4 AM 17° Partly Cloudy 4% 8 mph NW 94%
5 AM 16° Partly Cloudy 4% 7 mph NW 94%
6 AM 15° Partly Cloudy 5% 7 mph NW 94%
7 AM 16° Partly Cloudy 5% 7 mph NW 93%
8 AM 17° Partly Cloudy 8% 8 mph NW 90%
9 AM 19° Mostly Clear 8% 8 mph NW 86%
10 AM 21° Mostly Clear 17% 9 mph NW 82%
11 AM 22° Mostly Clear 17% 10 mph NW 75%
12 PM 24° Mostly Clear 20% 11 mph NW 69%
1 PM 26° Mostly Clear 20% 12 mph NW 64%
2 PM 26° Mostly Clear 20% 12 mph NW 64%
3 PM 26° Mostly Clear 20% 12 mph NW 64%
4 PM 27° Clear 10% 12 mph NW 62%
5 PM 26° Mostly Clear 5% 11 mph NW 64%
6 PM 24° Mostly Clear 5% 10 mph NW 68%
7 PM 23° Mostly Clear 3% 10 mph NW 68%
8 PM 22° Mostly Clear 3% 9 mph NW 70%
15-Day Forecast
Today
8/21
Mostly Cloudy
66%
15°
27°
Sat
8/22
Mostly Clear
20%
15°
27°
Sun
8/23
Mostly Clear
3%
12°
24°
Mon
8/24
Overcast
44%
12°
22°
Tue
8/25
Clear
64%
12°
24°
Wed
8/26
Clear
64%
16°
27°
Thu
8/27
Clear
30%
17°
26°
Fri
8/28
Clear
17%
16°
26°
Sat
8/29
Drizzle
68%
16°
27°
Sun
8/30
Rain
68%
19°
27°
Mon
8/31
Drizzle
60%
19°
30°
Tue
9/1
Drizzle
60%
18°
30°
Wed
9/2
Drizzle
60%
18°
27°
Thu
9/3
Drizzle
60%
17°
26°
Fri
9/4
Drizzle
60%
16°
27°
36
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
36 AQI 6.5 µg/m³
O3
Ground-level ozone
32 AQI 35 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 36 Good 32 36
Sun 25 Good 25 24
Mon 22 Good 22 9
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 Aug 21, 23:00'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
SBCAPE1092 J/kg
MLCAPE2205 J/kg
MUCAPE2583 J/kg
SBCIN-138 J/kg
MLCIN-34 J/kg
Lifted Index-3.5
Kinematics
0–6 km Shear31 kt
0–1 km Shear19 kt
Eff. Shear30 kt
0–1 km SRH131
0–3 km SRH161
Eff. SRH161
Storm Motion336° @ 21 kt
0–1 km EHI0.9
Composite Parameters
Sig. Tornado0.5
STP (eff)1.2
Supercell6.4
K-Index37.6
Thermo & Levels
PWAT1.81 in
0–3 km LR5.1 °C/km
700–500 LR6.3 °C/km
Total Totals53.7
LCL977 hPa
LFC795 hPa
EL223 hPa
Freezing Lvl12,382 ft