Severe Thunderstorm Watch 12:00 AM Severe Thunderstorm Watch 12:00 AM

Knox County, Illinois, United States

Last updated: 11:01 PM CDT  ·  Refresh
22°C
Feels like 25°
Partly Cloudy
▲ 28°  /  ▼ 16°
Wind
5 mph NW
Humidity
92%
Dew Point
21°
Pressure
29.20 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
30%
Sunrise
6:16 AM
Sunset
7:50 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Knox County is currently partly cloudy at 22°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1865 J/kg) — isolated convective development possible. Sunrise: 6:16AM · Sunset: 7:50PM.

Alerts

Severe Thunderstorm Watch
Expires 12:00 AM
Severe Thunderstorm Watch
Expires 12:00 AM
35 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
4%
12 AM
22°
16%
1 AM
21°
3%
2 AM
19°
3%
3 AM
19°
3%
4 AM
18°
3%
5 AM
16°
3%
6 AM
16°
3%
7 AM
16°
3%
8 AM
18°
5%
9 AM
21°
5%
10 AM
22°
5%
11 AM
23°
8%
12 PM
24°
8%
1 PM
27°
9%
2 PM
27°
9%
3 PM
27°
9%
4 PM
27°
5%
5 PM
28°
5%
6 PM
26°
5%
7 PM
25°
3%
8 PM
24°
3%
9 PM
22°
3%
10 PM
19°
3%
7-Day Forecast
Tonight
28° 16°
Partly Cloudy.
Sat
28° 16°
Clear.
Sun
26° 12°
Partly Cloudy.
Mon
23° 14°
Mostly Cloudy with a 47% chance of rain.
Tue
26° 12°
Rain, 64% chance.
Wed
28° 17°
Thunderstorm, 64% chance.
Thu
28° 17°
Rain, 33% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Partly Cloudy 4% 5 mph NW 92%
12 AM 22° Clear 16% 6 mph NNW 90%
1 AM 21° Clear 3% 5 mph NNW 90%
2 AM 19° Partly Cloudy 3% 6 mph NW 90%
3 AM 19° Clear 3% 7 mph NW 90%
4 AM 18° Clear 3% 6 mph NNW 91%
5 AM 16° Clear 3% 6 mph NNW 91%
6 AM 16° Clear 3% 6 mph NNW 91%
7 AM 16° Clear 3% 6 mph NW 91%
8 AM 18° Clear 5% 7 mph NW 86%
9 AM 21° Clear 5% 8 mph NW 80%
10 AM 22° Clear 5% 8 mph NW 75%
11 AM 23° Clear 8% 10 mph NW 70%
12 PM 24° Clear 8% 11 mph WNW 66%
1 PM 27° Clear 9% 12 mph WNW 63%
2 PM 27° Clear 9% 13 mph WNW 63%
3 PM 27° Mostly Clear 9% 13 mph WNW 63%
4 PM 27° Mostly Clear 5% 13 mph NW 62%
5 PM 28° Mostly Clear 5% 12 mph NW 66%
6 PM 26° Clear 5% 10 mph NW 69%
7 PM 25° Clear 3% 10 mph NW 70%
8 PM 24° Clear 3% 10 mph NW 72%
9 PM 22° Clear 3% 10 mph NW 73%
10 PM 19° Clear 3% 8 mph NW 74%
15-Day Forecast
Today
8/21
Partly Cloudy
4%
16°
28°
Sat
8/22
Clear
9%
16°
28°
Sun
8/23
Partly Cloudy
3%
12°
26°
Mon
8/24
Mostly Cloudy
47%
14°
23°
Tue
8/25
Rain
64%
12°
26°
Wed
8/26
Thunderstorm
64%
17°
28°
Thu
8/27
Rain
33%
17°
28°
Fri
8/28
Clear
17%
17°
27°
Sat
8/29
Thunderstorm
68%
16°
29°
Sun
8/30
Drizzle
68%
19°
31°
Mon
8/31
Drizzle
60%
19°
32°
Tue
9/1
Drizzle
60%
19°
31°
Wed
9/2
Drizzle
60%
19°
29°
Thu
9/3
Drizzle
60%
18°
28°
Fri
9/4
Clear
60%
17°
29°
35
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
35 AQI 6.3 µg/m³
O3
Ground-level ozone
31 AQI 34 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 35 Good 31 35
Sun 34 Good 34 28
Mon 28 Good 28 8
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 50 60 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1462 J/kg
MLCAPE2294 J/kg
MUCAPE2679 J/kg
SBCIN-129 J/kg
MLCIN-35 J/kg
Lifted Index-4.9
Kinematics
0–6 km Shear27 kt
0–1 km Shear22 kt
Eff. Shear27 kt
0–1 km SRH117
0–3 km SRH120
Eff. SRH120
Storm Motion332° @ 28 kt
0–1 km EHI1.1
Composite Parameters
Sig. Tornado0.5
STP (eff)0.9
Supercell4.5
K-Index30.6
Thermo & Levels
PWAT1.53 in
0–3 km LR5.2 °C/km
700–500 LR6.7 °C/km
Total Totals53.5
LCL961 hPa
LFC822 hPa
EL229 hPa
Freezing Lvl13,048 ft