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

Grundy County, Illinois, United States

Last updated: 9:13 PM CDT  ·  Refresh
22°C
Feels like 23°
Rain
▲ 27°  /  ▼ 15°
Wind
9 mph SW
Humidity
92%
Dew Point
20°
Pressure
29.32 inHg
Visibility
8 mi
UV Index
0.0
Cloud Cover
74%
Sunrise
6:09 AM
Sunset
7:43 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Grundy County is currently rain at 22°C. Precipitation is likely — peak probability 60% around 10 PM. Atmospheric instability is elevated (CAPE up to 1675 J/kg) — isolated convective development possible. Sunrise: 6:09AM · Sunset: 7:43PM.

Alerts

Severe Thunderstorm Watch
Expires 10:00 PM
Severe Thunderstorm Watch
Expires 10:00 PM
38 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
58%
10 PM
22°
60%
11 PM
22°
41%
12 AM
21°
33%
1 AM
21°
16%
2 AM
20°
3%
3 AM
19°
6%
4 AM
19°
8%
5 AM
18°
8%
6 AM
17°
5%
7 AM
17°
5%
8 AM
18°
10%
9 AM
20°
22%
10 AM
22°
31%
11 AM
23°
32%
12 PM
24°
32%
1 PM
27°
29%
2 PM
27°
37%
3 PM
27°
38%
4 PM
28°
38%
5 PM
27°
12%
6 PM
26°
13%
7 PM
25°
3%
8 PM
24°
3%
7-Day Forecast
Tonight
27° 15°
Rain, 58% chance.
Sat
28° 15°
Mostly Clear with a 38% chance of rain.
Sun
24° 13°
Partly Cloudy.
Mon
23° 11°
Overcast with a 37% chance of rain.
Tue
25° 13°
Clear with a 64% chance of rain.
Wed
27° 15°
Rain, 64% chance.
Thu
27° 17°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Rain 58% 9 mph SW 92%
10 PM 22° Partly Cloudy 60% 8 mph SW 92%
11 PM 22° Partly Cloudy 41% 6 mph WSW 94%
12 AM 21° Partly Cloudy 33% 6 mph W 96%
1 AM 21° Partly Cloudy 16% 6 mph W 96%
2 AM 20° Mostly Clear 3% 6 mph W 96%
3 AM 19° Partly Cloudy 6% 7 mph WNW 96%
4 AM 19° Partly Cloudy 8% 8 mph WNW 96%
5 AM 18° Partly Cloudy 8% 8 mph NW 96%
6 AM 17° Partly Cloudy 5% 8 mph NW 96%
7 AM 17° Partly Cloudy 5% 8 mph NW 94%
8 AM 18° Partly Cloudy 10% 10 mph NW 90%
9 AM 20° Partly Cloudy 22% 10 mph NW 84%
10 AM 22° Partly Cloudy 31% 10 mph NW 80%
11 AM 23° Mostly Clear 32% 10 mph NW 75%
12 PM 24° Mostly Clear 32% 10 mph NW 70%
1 PM 27° Mostly Clear 29% 11 mph NW 67%
2 PM 27° Mostly Clear 37% 11 mph NW 67%
3 PM 27° Mostly Clear 38% 12 mph WNW 67%
4 PM 28° Mostly Clear 38% 12 mph WNW 68%
5 PM 27° Clear 12% 11 mph WNW 70%
6 PM 26° Clear 13% 10 mph WNW 72%
7 PM 25° Clear 3% 10 mph NW 71%
8 PM 24° Clear 3% 9 mph NW 73%
15-Day Forecast
Today
8/21
Rain
58%
15°
27°
Sat
8/22
Mostly Clear
38%
15°
28°
Sun
8/23
Partly Cloudy
3%
13°
24°
Mon
8/24
Overcast
37%
11°
23°
Tue
8/25
Clear
64%
13°
25°
Wed
8/26
Rain
64%
15°
27°
Thu
8/27
Drizzle
52%
17°
27°
Fri
8/28
Clear
17%
17°
27°
Sat
8/29
Drizzle
68%
17°
28°
Sun
8/30
Drizzle
68%
19°
28°
Mon
8/31
Drizzle
60%
19°
32°
Tue
9/1
Drizzle
60%
19°
32°
Wed
9/2
Drizzle
60%
18°
28°
Thu
9/3
Drizzle
60%
17°
27°
Fri
9/4
Drizzle
60%
17°
28°
38
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
38 AQI 6.8 µg/m³
O3
Ground-level ozone
37 AQI 40 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 38 Good 37 38
Sun 27 Good 27 22
Mon 23 Good 23 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, 01:00'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
SBCAPE1141 J/kg
MLCAPE1610 J/kg
MUCAPE1882 J/kg
SBCIN-148 J/kg
MLCIN-47 J/kg
Lifted Index-3.7
Kinematics
0–6 km Shear30 kt
0–1 km Shear16 kt
Eff. Shear29 kt
0–1 km SRH110
0–3 km SRH153
Eff. SRH153
Storm Motion331° @ 16 kt
0–1 km EHI0.8
Composite Parameters
Sig. Tornado0.4
STP (eff)0.8
Supercell4.2
K-Index33.6
Thermo & Levels
PWAT1.73 in
0–3 km LR5.4 °C/km
700–500 LR6.3 °C/km
Total Totals52.7
LCL964 hPa
LFC738 hPa
EL222 hPa
Freezing Lvl12,014 ft