Flood Warning — Cook County, IL, Lake County, IN 10:00 AM Flood Warning — Cook County, IL 2:51 PM Beach Hazards Statement — Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN 10:00 AM

Cook County, Illinois, United States

Last updated: 12:49 AM CDT  ·  Refresh
24°C
Feels like 27°
Mostly Clear
▲ 24°  /  ▼ 19°
Wind
7 mph W
Humidity
83%
Dew Point
22°
Pressure
29.02 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
30%
Sunrise
5:41 AM
Sunset
8:13 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Cook County is currently mostly clear at 24°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1206 J/kg) — isolated convective development possible. Sunrise: 5:41AM · Sunset: 8:13PM.

Alerts

Flood Warning
Cook County, IL, Lake County, IN
Expires 10:00 AM
Flood Warning
Cook County, IL
Expires 2:51 PM
Beach Hazards Statement
Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN
Expires 10:00 AM
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
15%
1 AM
24°
11%
2 AM
24°
12%
3 AM
23°
5%
4 AM
22°
5%
5 AM
21°
3%
6 AM
21°
3%
7 AM
21°
3%
8 AM
21°
21%
9 AM
22°
6%
10 AM
23°
6%
11 AM
23°
7%
12 PM
24°
7%
1 PM
21°
7%
2 PM
22°
7%
3 PM
22°
7%
4 PM
21°
7%
5 PM
22°
3%
6 PM
21°
3%
7 PM
21°
3%
8 PM
21°
3%
9 PM
20°
3%
10 PM
20°
3%
11 PM
19°
3%
7-Day Forecast
Today
24° 19°
Partly Cloudy.
Wed
28° 19°
Clear.
Thu
30° 21°
Partly Cloudy.
Fri
25° 19°
Fog with a 65% chance of rain.
Sat
23° 18°
Rain, 90% chance.
Sun
24° 20°
Clear.
Mon
28° 21°
Rain.
TimeTempConditionsPrecipWindHumidity
Now 24° Mostly Clear 15% 7 mph W 83%
1 AM 24° Mostly Clear 11% 7 mph NW 81%
2 AM 24° Mostly Cloudy 12% 9 mph N 84%
3 AM 23° Mostly Cloudy 5% 12 mph N 88%
4 AM 22° Mostly Cloudy 5% 12 mph N 89%
5 AM 21° Mostly Cloudy 3% 12 mph N 88%
6 AM 21° Mostly Cloudy 3% 11 mph N 88%
7 AM 21° Mostly Cloudy 3% 12 mph N 86%
8 AM 21° Mostly Cloudy 21% 12 mph N 83%
9 AM 22° Overcast 6% 12 mph N 80%
10 AM 23° Mostly Cloudy 6% 12 mph N 76%
11 AM 23° Partly Cloudy 7% 12 mph N 71%
12 PM 24° Mostly Clear 7% 12 mph N 67%
1 PM 21° Mostly Clear 7% 12 mph N 63%
2 PM 22° Clear 7% 12 mph N 58%
3 PM 22° Clear 7% 12 mph N 54%
4 PM 21° Clear 7% 12 mph N 53%
5 PM 22° Clear 3% 12 mph N 54%
6 PM 21° Clear 3% 12 mph N 55%
7 PM 21° Clear 3% 11 mph N 58%
8 PM 21° Mostly Clear 3% 11 mph N 60%
9 PM 20° Mostly Clear 3% 10 mph N 63%
10 PM 20° Mostly Clear 3% 10 mph N 65%
11 PM 19° Mostly Clear 3% 9 mph N 67%
15-Day Forecast
Today
7/28
Partly Cloudy
15%
19°
24°
Wed
7/29
Clear
6%
19°
28°
Thu
7/30
Partly Cloudy
14%
21°
30°
Fri
7/31
Fog
65%
19°
25°
Sat
8/1
Rain
90%
18°
23°
Sun
8/2
Clear
17%
20°
24°
Mon
8/3
Rain
13%
21°
28°
Tue
8/4
Rain
68%
21°
30°
Wed
8/5
Rain
66%
22°
30°
Thu
8/6
Drizzle
51%
23°
32°
Fri
8/7
Drizzle
60%
21°
31°
Sat
8/8
Drizzle
60%
21°
26°
Sun
8/9
Drizzle
60%
21°
26°
Mon
8/10
Drizzle
60%
21°
26°
Tue
8/11
Drizzle
60%
21°
25°
54
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
54 AQI 10.6 µg/m³
O3
Ground-level ozone
41 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 41 54
Wed 31 Good 31 21
Thu 36 Good 35 36
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 Tue Jul 28, 04:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 90 100 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE565 J/kg
MLCAPE1549 J/kg
MUCAPE2425 J/kg
SBCIN-426 J/kg
MLCIN0 J/kg
Lifted Index-2.0
Kinematics
0–6 km Shear41 kt
0–1 km Shear18 kt
Eff. Shear46 kt
0–1 km SRH15
0–3 km SRH13
Eff. SRH-29
Storm Motion286° @ 31 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.1
STP (eff)0.0
Supercell0.0
K-Index12.1
Thermo & Levels
PWAT1.42 in
0–3 km LR3.9 °C/km
700–500 LR6.7 °C/km
Total Totals47.5
LCL946 hPa
LFC582 hPa
EL253 hPa
Freezing Lvl15,997 ft