Severe Thunderstorm Watch 10:00 p. m. Severe Thunderstorm Watch 10:00 p. m.

Cook County, Illinois, United States

Last updated: 9:08 p. m. CDT  ·  Refresh
22°C
Feels like 24°
Mostly Cloudy
▲ 27°  /  ▼ 17°
Wind
6 mph SW
Humidity
90%
Dew Point
19°
Pressure
29,28 inHg
Visibility
10 mi
UV Index
0,0
Cloud Cover
85%
Sunrise
6:05 a. m.
Sunset
7:41 p. m.
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WeatherAI™ Analysis

WeatherAI Analysis: Cook County is currently mostly cloudy at 22°C. Precipitation is likely — peak probability 57% around 9 p. m.. Atmospheric instability is elevated (CAPE up to 1051 J/kg) — isolated convective development possible. Sunrise: 6:05A. M. · Sunset: 7:41P. M..

Alerts

Severe Thunderstorm Watch
Expires 10:00 p. m.
Severe Thunderstorm Watch
Expires 10:00 p. m.
55 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
57%
10 p. m.
22°
35%
11 p. m.
21°
36%
12 a. m.
21°
37%
1 a. m.
20°
8%
2 a. m.
20°
9%
3 a. m.
19°
6%
4 a. m.
19°
6%
5 a. m.
19°
6%
6 a. m.
19°
15%
7 a. m.
19°
15%
8 a. m.
19°
23%
9 a. m.
21°
10%
10 a. m.
22°
19%
11 a. m.
23°
19%
12 p. m.
24°
23%
1 p. m.
27°
29%
2 p. m.
27°
33%
3 p. m.
27°
33%
4 p. m.
27°
23%
5 p. m.
27°
23%
6 p. m.
27°
20%
7 p. m.
26°
12%
8 p. m.
26°
13%
7-Day Forecast
Tonight
27° 17°
Mostly Cloudy with a 57% chance of rain.
Sat
27° 19°
Partly Cloudy with a 37% chance of rain.
Sun
25° 17°
Partly Cloudy.
Mon
24° 14°
Mostly Cloudy with a 37% chance of rain.
Tue
27° 17°
Clear with a 64% chance of rain.
Wed
28° 16°
Rain, 64% chance.
Thu
29° 19°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Mostly Cloudy 57% 6 mph SW 90%
10 p. m. 22° Mostly Cloudy 35% 6 mph SW 92%
11 p. m. 21° Mostly Cloudy 36% 6 mph WSW 93%
12 a. m. 21° Partly Cloudy 37% 6 mph WSW 93%
1 a. m. 20° Partly Cloudy 8% 5 mph W 93%
2 a. m. 20° Partly Cloudy 9% 4 mph W 94%
3 a. m. 19° Partly Cloudy 6% 4 mph W 94%
4 a. m. 19° Partly Cloudy 6% 4 mph W 94%
5 a. m. 19° Partly Cloudy 6% 6 mph NW 92%
6 a. m. 19° Partly Cloudy 15% 7 mph NW 90%
7 a. m. 19° Partly Cloudy 15% 9 mph NW 88%
8 a. m. 19° Partly Cloudy 23% 10 mph NW 80%
9 a. m. 21° Partly Cloudy 10% 10 mph NW 73%
10 a. m. 22° Partly Cloudy 19% 11 mph NW 66%
11 a. m. 23° Partly Cloudy 19% 10 mph NW 60%
12 p. m. 24° Partly Cloudy 23% 10 mph NW 55%
1 p. m. 27° Partly Cloudy 29% 10 mph NW 51%
2 p. m. 27° Partly Cloudy 33% 10 mph NW 51%
3 p. m. 27° Partly Cloudy 33% 11 mph NW 50%
4 p. m. 27° Partly Cloudy 23% 11 mph NW 50%
5 p. m. 27° Partly Cloudy 23% 10 mph NW 52%
6 p. m. 27° Partly Cloudy 20% 10 mph NW 54%
7 p. m. 26° Partly Cloudy 12% 9 mph NW 57%
8 p. m. 26° Partly Cloudy 13% 8 mph NW 60%
15-Day Forecast
Today
8/21
Mostly Cloudy
57%
17°
27°
Sat
8/22
Partly Cloudy
37%
19°
27°
Sun
8/23
Partly Cloudy
3%
17°
25°
Mon
8/24
Mostly Cloudy
37%
14°
24°
Tue
8/25
Clear
64%
17°
27°
Wed
8/26
Rain
64%
16°
28°
Thu
8/27
Drizzle
52%
19°
29°
Fri
8/28
Drizzle
53%
20°
28°
Sat
8/29
Drizzle
68%
19°
29°
Sun
8/30
Rain
68%
21°
28°
Mon
8/31
Drizzle
60%
21°
33°
Tue
9/1
Drizzle
60%
21°
33°
Wed
9/2
Drizzle
60%
20°
27°
Thu
9/3
Drizzle
60%
20°
26°
Fri
9/4
Drizzle
60%
19°
27°
55
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
55 AQI 11.4 µg/m³
O3
Ground-level ozone
39 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 55 Moderate 39 55
Sun 33 Good 33 26
Mon 26 Good 26 14
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 vie. ago. 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
SBCAPE980 J/kg
MLCAPE1227 J/kg
MUCAPE1342 J/kg
SBCIN-97 J/kg
MLCIN-33 J/kg
Lifted Index-3.3
Kinematics
0–6 km Shear33 kt
0–1 km Shear17 kt
Eff. Shear32 kt
0–1 km SRH82
0–3 km SRH130
Eff. SRH130
Storm Motion338° @ 15 kt
0–1 km EHI0.5
Composite Parameters
Sig. Tornado0.3
STP (eff)0.6
Supercell2.9
K-Index35.3
Thermo & Levels
PWAT1.68 in
0–3 km LR5.6 °C/km
700–500 LR6.4 °C/km
Total Totals51.7
LCL947 hPa
LFC775 hPa
EL233 hPa
Freezing Lvl12,182 ft