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

Knox County, Illinois, United States

Last updated: 9:12 PM CDT  ·  Refresh
23°C
Feels like 26°
Mostly Clear
▲ 28°  /  ▼ 16°
Wind
7 mph W
Humidity
90%
Dew Point
21°
Pressure
29.19 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
10%
Sunrise
6:16 AM
Sunset
7:50 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Knox County is currently mostly clear at 23°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2032 J/kg) — isolated convective development possible. Sunrise: 6:16AM · Sunset: 7:50PM.

Alerts

Severe Thunderstorm Watch
Expires 10:00 PM
Severe Thunderstorm Watch
Expires 10:00 PM
35 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
30%
10 PM
22°
38%
11 PM
22°
34%
12 AM
21°
16%
1 AM
19°
3%
2 AM
19°
3%
3 AM
18°
3%
4 AM
18°
3%
5 AM
17°
3%
6 AM
16°
3%
7 AM
16°
3%
8 AM
18°
5%
9 AM
21°
5%
10 AM
23°
5%
11 AM
24°
8%
12 PM
25°
8%
1 PM
27°
9%
2 PM
27°
20%
3 PM
27°
5%
4 PM
28°
5%
5 PM
27°
5%
6 PM
26°
5%
7 PM
25°
3%
8 PM
24°
3%
7-Day Forecast
Tonight
28° 16°
Mostly Clear with a 30% chance of rain.
Sat
28° 16°
Mostly Clear.
Sun
26° 12°
Clear.
Mon
24° 14°
Overcast with a 54% chance of rain.
Tue
26° 13°
Clear with a 64% chance of rain.
Wed
28° 17°
Thunderstorm, 64% chance.
Thu
27° 17°
Rain, 33% chance.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Clear 30% 7 mph W 90%
10 PM 22° Partly Cloudy 38% 6 mph NW 90%
11 PM 22° Mostly Clear 34% 6 mph NNW 90%
12 AM 21° Clear 16% 5 mph NNW 89%
1 AM 19° Clear 3% 6 mph NW 89%
2 AM 19° Clear 3% 6 mph NW 90%
3 AM 18° Clear 3% 6 mph NW 91%
4 AM 18° Clear 3% 6 mph NW 91%
5 AM 17° Clear 3% 6 mph NW 91%
6 AM 16° Clear 3% 6 mph NW 91%
7 AM 16° Clear 3% 6 mph NW 90%
8 AM 18° Clear 5% 7 mph NW 84%
9 AM 21° Clear 5% 7 mph NW 78%
10 AM 23° Clear 5% 8 mph NW 72%
11 AM 24° Clear 8% 10 mph NW 68%
12 PM 25° Clear 8% 11 mph NW 65%
1 PM 27° Mostly Clear 9% 13 mph NW 63%
2 PM 27° Mostly Clear 20% 13 mph NW 63%
3 PM 27° Mostly Clear 5% 12 mph NW 62%
4 PM 28° Mostly Clear 5% 12 mph NW 63%
5 PM 27° Mostly Clear 5% 11 mph NW 66%
6 PM 26° Clear 5% 10 mph NW 70%
7 PM 25° Clear 3% 10 mph NW 70%
8 PM 24° Clear 3% 10 mph NW 72%
15-Day Forecast
Today
8/21
Mostly Clear
30%
16°
28°
Sat
8/22
Mostly Clear
16%
16°
28°
Sun
8/23
Clear
3%
12°
26°
Mon
8/24
Overcast
54%
14°
24°
Tue
8/25
Clear
64%
13°
26°
Wed
8/26
Thunderstorm
64%
17°
28°
Thu
8/27
Rain
33%
17°
27°
Fri
8/28
Clear
17%
17°
27°
Sat
8/29
Thunderstorm
68%
16°
29°
Sun
8/30
Rain
68%
19°
31°
Mon
8/31
Drizzle
60%
19°
31°
Tue
9/1
Drizzle
60%
19°
30°
Wed
9/2
Drizzle
60%
19°
29°
Thu
9/3
Drizzle
60%
18°
28°
Fri
9/4
Drizzle
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 Fri Aug 21, 23:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2155 J/kg
MLCAPE2902 J/kg
MUCAPE3333 J/kg
SBCIN-126 J/kg
MLCIN-36 J/kg
Lifted Index-5.7
Kinematics
0–6 km Shear26 kt
0–1 km Shear20 kt
Eff. Shear25 kt
0–1 km SRH149
0–3 km SRH174
Eff. SRH174
Storm Motion340° @ 23 kt
0–1 km EHI2.0
Composite Parameters
Sig. Tornado0.9
STP (eff)1.5
Supercell7.5
K-Index32.6
Thermo & Levels
PWAT1.58 in
0–3 km LR5.7 °C/km
700–500 LR6.3 °C/km
Total Totals53.5
LCL961 hPa
LFC835 hPa
EL211 hPa
Freezing Lvl13,018 ft