Heat Advisory — Boone, IL, McHenry, IL, Kane, IL, Kendall, IL, Kankakee, IL, Iroquois, IL, Northern Will, IL, Southern Will, IL, Eastern Will, IL, Winnebago, IL, Ogle, IL, Lee, IL, De Kalb, IL, La Salle, IL, Grundy, IL, Livingston, IL, Ford, IL, Porter, IN, Lake, IN, Newton, IN, Jasper, IN, Benton, IN 9:00 PM Excessive Heat Warning — Winnebago, IL, Ogle, IL, Lee, IL, De Kalb, IL, La Salle, IL, Grundy, IL, Livingston, IL, Ford, IL, Lake, IN, Newton, IN, Jasper, IN, Benton, IN, Porter, IN, Boone, IL, McHenry, IL, Kane, IL, Kendall, IL, Lake, IL, DuPage, IL, Kankakee, IL, Iroquois, IL, Northern Cook, IL, Central Cook, IL, Southern Cook, IL, Northern Will, IL, Southern Will, IL, Eastern Will, IL 9:00 PM

Iroquois County, Illinois, United States

Last updated: 7:57 PM CDT  ·  Refresh
26°C
Feels like 28°
Partly Cloudy
▲ 30°  /  ▼ 21°
Wind
8 mph SSW
Humidity
79%
Dew Point
23°
Pressure
29.05 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
53%
Sunrise
5:43 AM
Sunset
8:11 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Iroquois County is currently partly cloudy at 26°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1723 J/kg) — isolated convective development possible. Sunrise: 5:43AM · Sunset: 8:11PM.

Alerts

Heat Advisory
Boone, IL, McHenry, IL, Kane, IL, Kendall, IL, Kankakee, IL, Iroquois, IL, Northern Will, IL, Southern Will, IL, Eastern Will, IL, Winnebago, IL, Ogle, IL, Lee, IL, De Kalb, IL, La Salle, IL, Grundy, IL, Livingston, IL, Ford, IL, Porter, IN, Lake, IN, Newton, IN, Jasper, IN, Benton, IN
Expires 9:00 PM
Excessive Heat Warning
Winnebago, IL, Ogle, IL, Lee, IL, De Kalb, IL, La Salle, IL, Grundy, IL, Livingston, IL, Ford, IL, Lake, IN, Newton, IN, Jasper, IN, Benton, IN, Porter, IN, Boone, IL, McHenry, IL, Kane, IL, Kendall, IL, Lake, IL, DuPage, IL, Kankakee, IL, Iroquois, IL, Northern Cook, IL, Central Cook, IL, Southern Cook, IL, Northern Will, IL, Southern Will, IL, Eastern Will, IL
Expires 9:00 PM
48 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
16%
8 PM
25°
34%
9 PM
25°
26%
10 PM
25°
37%
11 PM
25°
36%
12 AM
24°
25%
1 AM
24°
4%
2 AM
23°
4%
3 AM
23°
3%
4 AM
21°
3%
5 AM
21°
3%
6 AM
21°
3%
7 AM
21°
3%
8 AM
22°
3%
9 AM
23°
3%
10 AM
24°
3%
11 AM
24°
3%
12 PM
24°
3%
1 PM
25°
3%
2 PM
27°
3%
3 PM
27°
3%
4 PM
26°
3%
5 PM
24°
3%
6 PM
23°
3%
7-Day Forecast
Tonight
30° 21°
Partly Cloudy with a 37% chance of rain.
Tue
28° 15°
Partly Cloudy.
Wed
27° 14°
Clear.
Thu
28° 17°
Mostly Clear.
Fri
23° 17°
Rain, 64% chance.
Sat
24° 16°
Rain, 82% chance.
Sun
26° 16°
Rain, 28% chance.
TimeTempConditionsPrecipWindHumidity
Now 26° Partly Cloudy 16% 8 mph SSW 79%
8 PM 25° Partly Cloudy 34% 10 mph SSW 79%
9 PM 25° Mostly Clear 26% 10 mph SW 77%
10 PM 25° Rain 37% 9 mph SW 79%
11 PM 25° Rain 36% 9 mph WSW 82%
12 AM 24° Mostly Clear 25% 11 mph WSW 85%
1 AM 24° Partly Cloudy 4% 9 mph W 87%
2 AM 23° Partly Cloudy 4% 8 mph WNW 90%
3 AM 23° Mostly Cloudy 3% 8 mph NW 92%
4 AM 21° Mostly Cloudy 3% 9 mph NNW 92%
5 AM 21° Mostly Cloudy 3% 10 mph N 93%
6 AM 21° Mostly Cloudy 3% 12 mph N 92%
7 AM 21° Partly Cloudy 3% 12 mph N 90%
8 AM 22° Mostly Cloudy 3% 12 mph N 88%
9 AM 23° Overcast 3% 12 mph N 85%
10 AM 24° Mostly Cloudy 3% 12 mph N 81%
11 AM 24° Mostly Cloudy 3% 12 mph N 76%
12 PM 24° Mostly Cloudy 3% 13 mph N 71%
1 PM 25° Partly Cloudy 3% 13 mph N 69%
2 PM 27° Partly Cloudy 3% 13 mph N 67%
3 PM 27° Mostly Clear 3% 13 mph N 66%
4 PM 26° Mostly Clear 3% 12 mph N 66%
5 PM 24° Mostly Clear 3% 12 mph N 67%
6 PM 23° Mostly Clear 3% 12 mph N 68%
15-Day Forecast
Today
7/27
Partly Cloudy
37%
21°
30°
Tue
7/28
Partly Cloudy
4%
15°
28°
Wed
7/29
Clear
6%
14°
27°
Thu
7/30
Mostly Clear
14%
17°
28°
Fri
7/31
Rain
64%
17°
23°
Sat
8/1
Rain
82%
16°
24°
Sun
8/2
Rain
28%
16°
26°
Mon
8/3
Clear
17%
16°
26°
Tue
8/4
Drizzle
44%
18°
28°
Wed
8/5
Rain
68%
19°
28°
Thu
8/6
Rain
68%
19°
29°
Fri
8/7
Drizzle
60%
19°
29°
Sat
8/8
Drizzle
60%
20°
26°
Sun
8/9
Drizzle
60%
19°
26°
Mon
8/10
Clear
60%
19°
26°
48
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
48 AQI 8.7 µg/m³
O3
Ground-level ozone
37 AQI 41 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 48 Good 37 48
Wed 43 Good 38 43
Thu 39 Good 39 39
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 Mon Jul 27, 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
SBCAPE1094 J/kg
MLCAPE2849 J/kg
MUCAPE4114 J/kg
SBCIN-323 J/kg
MLCIN0 J/kg
Lifted Index-4.2
Kinematics
0–6 km Shear47 kt
0–1 km Shear24 kt
Eff. Shear58 kt
0–1 km SRH229
0–3 km SRH228
Eff. SRH171
Storm Motion278° @ 37 kt
0–1 km EHI1.6
Composite Parameters
Sig. Tornado2.2
STP (eff)0.0
Supercell20.8
K-Index39.1
Thermo & Levels
PWAT2.02 in
0–3 km LR4.2 °C/km
700–500 LR7.1 °C/km
Total Totals54.1
LCL940 hPa
LFC619 hPa
EL220 hPa
Freezing Lvl15,951 ft