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Northerly Island to Calumet Harbor IL, LM

Last updated: 10:16 PM CDT  ·  Refresh
24°C
Feels like 27°
Overcast
▲ 37°  /  ▼ 23°
Wind
5 mph S
Humidity
89%
Dew Point
22°
Pressure
29.95 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
92%
Sunrise
6:35 AM
Sunset
7:40 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Northerly Island to Calumet Harbor IL is currently overcast at 24°C. Precipitation is likely — peak probability 61% around 11 PM. Atmospheric instability is elevated (CAPE up to 3219 J/kg) — isolated convective development possible. Sunrise: 6:35AM · Sunset: 7:40PM.

51 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
50%
11 PM
25°
61%
12 AM
25°
21%
1 AM
24°
6%
2 AM
24°
7%
3 AM
24°
8%
4 AM
24°
8%
5 AM
23°
8%
6 AM
23°
3%
7 AM
23°
3%
8 AM
25°
3%
9 AM
27°
3%
10 AM
29°
3%
11 AM
31°
3%
12 PM
32°
3%
1 PM
36°
3%
2 PM
37°
3%
3 PM
37°
3%
4 PM
38°
3%
5 PM
36°
3%
6 PM
36°
3%
7 PM
35°
3%
8 PM
34°
3%
9 PM
33°
3%
7-Day Forecast
Tonight
37° 23°
Overcast with a 50% chance of rain.
Sat
39° 23°
Partly Cloudy.
Sun
41° 26°
Mostly Clear with a 35% chance of rain.
Mon
36° 26°
Partly Cloudy with a 62% chance of rain.
Tue
38° 25°
Overcast with a 38% chance of rain.
Wed
37° 24°
Heavy Rain, 82% chance.
Thu
35° 24°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 24° Overcast 50% 5 mph S 89%
11 PM 25° Overcast 61% 5 mph SW 90%
12 AM 25° Overcast 21% 4 mph SW 90%
1 AM 24° Overcast 6% 3 mph WSW 90%
2 AM 24° Overcast 7% 3 mph WNW 89%
3 AM 24° Overcast 8% 3 mph WNW 88%
4 AM 24° Overcast 8% 3 mph WNW 88%
5 AM 23° Mostly Cloudy 8% 3 mph WNW 88%
6 AM 23° Mostly Cloudy 3% 2 mph W 88%
7 AM 23° Mostly Cloudy 3% 2 mph WSW 86%
8 AM 25° Partly Cloudy 3% 3 mph W 81%
9 AM 27° Partly Cloudy 3% 4 mph WNW 76%
10 AM 29° Mostly Clear 3% 4 mph WNW 71%
11 AM 31° Mostly Clear 3% 4 mph NW 65%
12 PM 32° Partly Cloudy 3% 3 mph NNW 58%
1 PM 36° Mostly Cloudy 3% 4 mph N 52%
2 PM 37° Partly Cloudy 3% 4 mph NNE 47%
3 PM 37° Partly Cloudy 3% 4 mph NE 43%
4 PM 38° Partly Cloudy 3% 4 mph ENE 40%
5 PM 36° Partly Cloudy 3% 4 mph E 43%
6 PM 36° Partly Cloudy 3% 4 mph ESE 45%
7 PM 35° Partly Cloudy 3% 4 mph ESE 49%
8 PM 34° Partly Cloudy 3% 5 mph SE 54%
9 PM 33° Partly Cloudy 3% 5 mph SSE 60%
15-Day Forecast
Today
8/21
Overcast
50%
23°
37°
Sat
8/22
Partly Cloudy
8%
23°
39°
Sun
8/23
Mostly Clear
35%
26°
41°
Mon
8/24
Partly Cloudy
62%
26°
36°
Tue
8/25
Overcast
38%
25°
38°
Wed
8/26
Heavy Rain
82%
24°
37°
Thu
8/27
Rain
82%
24°
35°
Fri
8/28
Drizzle
63%
24°
37°
Sat
8/29
Drizzle
69%
24°
37°
Sun
8/30
Drizzle
44%
24°
37°
Mon
8/31
Drizzle
51%
24°
38°
Tue
9/1
Drizzle
60%
24°
38°
Wed
9/2
Drizzle
60%
24°
37°
Thu
9/3
Drizzle
60%
23°
37°
Fri
9/4
Drizzle
60%
23°
37°
51
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
51 AQI 9.1 µg/m³
O3
Ground-level ozone
39 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 51 Moderate 39 51
Sun 44 Good 34 44
Mon 52 Moderate 48 52
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 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE414 J/kg
MLCAPE187 J/kg
MUCAPE414 J/kg
SBCIN-484 J/kg
MLCIN-434 J/kg
Lifted Index-2.3
Kinematics
0–6 km Shear29 kt
0–1 km Shear10 kt
Eff. Shear
0–1 km SRH56
0–3 km SRH166
Eff. SRH
Storm Motion59° @ 25 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.1
STP (eff)
Supercell
K-Index27.5
Thermo & Levels
PWAT1.78 in
0–3 km LR4.3 °C/km
700–500 LR6.1 °C/km
Total Totals44.0
LCL986 hPa
LFC696 hPa
EL317 hPa
Freezing Lvl15,072 ft