Severe Thunderstorm Watch 12:00 AM

Lee County, Illinois, United States

Last updated: 10:13 PM CDT  ·  Refresh
21°C
Feels like 22°
Partly Cloudy
▲ 27°  /  ▼ 14°
Wind
7 mph SW
Humidity
95%
Dew Point
19°
Pressure
29.10 inHg
Visibility
6 mi
UV Index
0.0
Cloud Cover
48%
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 partly cloudy at 21°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1515 J/kg) — isolated convective development possible. Sunrise: 6:11AM · Sunset: 7:47PM.

Alerts

Severe Thunderstorm Watch
Expires 12:00 AM
36 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
48%
11 PM
20°
17%
12 AM
19°
18%
1 AM
18°
5%
2 AM
18°
5%
3 AM
17°
8%
4 AM
16°
8%
5 AM
15°
8%
6 AM
14°
4%
7 AM
15°
5%
8 AM
17°
8%
9 AM
19°
8%
10 AM
21°
17%
11 AM
23°
17%
12 PM
24°
20%
1 PM
26°
12%
2 PM
27°
20%
3 PM
27°
9%
4 PM
27°
10%
5 PM
26°
5%
6 PM
24°
5%
7 PM
24°
3%
8 PM
23°
3%
9 PM
21°
3%
7-Day Forecast
Tonight
27° 14°
Partly Cloudy with a 48% chance of rain.
Sat
27° 14°
Mostly Clear.
Sun
24° 13°
Mostly Clear.
Mon
23° 12°
Mostly Cloudy with a 44% chance of rain.
Tue
24° 13°
Rain, 64% chance.
Wed
27° 16°
Thunderstorm, 64% chance.
Thu
26° 17°
Clear with a 30% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 21° Partly Cloudy 48% 7 mph SW 95%
11 PM 20° Mostly Clear 17% 6 mph WSW 95%
12 AM 19° Mostly Clear 18% 6 mph W 95%
1 AM 18° Mostly Clear 5% 7 mph WNW 95%
2 AM 18° Mostly Clear 5% 7 mph WNW 94%
3 AM 17° Mostly Clear 8% 7 mph NW 93%
4 AM 16° Mostly Clear 8% 7 mph NW 93%
5 AM 15° Mostly Clear 8% 7 mph NW 93%
6 AM 14° Mostly Clear 4% 6 mph NW 93%
7 AM 15° Mostly Clear 5% 6 mph NW 93%
8 AM 17° Mostly Clear 8% 7 mph NW 89%
9 AM 19° Mostly Clear 8% 7 mph NW 85%
10 AM 21° Clear 17% 8 mph NW 80%
11 AM 23° Clear 17% 10 mph WNW 74%
12 PM 24° Clear 20% 11 mph WNW 69%
1 PM 26° Clear 12% 13 mph WNW 65%
2 PM 27° Clear 20% 13 mph NW 65%
3 PM 27° Clear 9% 14 mph NW 64%
4 PM 27° Clear 10% 13 mph NW 62%
5 PM 26° Clear 5% 12 mph NW 64%
6 PM 24° Mostly Clear 5% 11 mph NW 68%
7 PM 24° Mostly Clear 3% 11 mph NW 66%
8 PM 23° Mostly Clear 3% 10 mph NW 70%
9 PM 21° Clear 3% 10 mph NW 73%
15-Day Forecast
Today
8/21
Partly Cloudy
48%
14°
27°
Sat
8/22
Mostly Clear
17%
14°
27°
Sun
8/23
Mostly Clear
3%
13°
24°
Mon
8/24
Mostly Cloudy
44%
12°
23°
Tue
8/25
Rain
64%
13°
24°
Wed
8/26
Thunderstorm
64%
16°
27°
Thu
8/27
Clear
30%
17°
26°
Fri
8/28
Clear
17%
16°
26°
Sat
8/29
Rain
68%
16°
27°
Sun
8/30
Rain
68%
19°
27°
Mon
8/31
Drizzle
60%
19°
30°
Tue
9/1
Drizzle
60%
18°
29°
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 Sat Aug 22, 02:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE727 J/kg
MLCAPE1358 J/kg
MUCAPE1881 J/kg
SBCIN-145 J/kg
MLCIN-64 J/kg
Lifted Index-3.0
Kinematics
0–6 km Shear31 kt
0–1 km Shear17 kt
Eff. Shear29 kt
0–1 km SRH45
0–3 km SRH14
Eff. SRH14
Storm Motion343° @ 19 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.1
STP (eff)0.1
Supercell0.4
K-Index34.4
Thermo & Levels
PWAT1.47 in
0–3 km LR5.0 °C/km
700–500 LR6.5 °C/km
Total Totals48.9
LCL968 hPa
LFC761 hPa
EL249 hPa
Freezing Lvl12,618 ft