Severe Thunderstorm Watch 7:00 PM Severe Thunderstorm Watch 7:00 PM 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 Beach Hazards Statement — Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN 10:00 AM

Porter County, Indiana, United States

Last updated: 6:06 PM CDT  ·  Refresh
24°C
Feels like 24°
Thunderstorm
▲ 28°  /  ▼ 20°
Wind
12 mph SSW
Humidity
82%
Dew Point
21°
Pressure
28.97 inHg
Visibility
3 mi
UV Index
3.6
Cloud Cover
69%
Sunrise
5:38 AM
Sunset
8:10 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Porter County is currently thunderstorm at 24°C. Precipitation is likely — peak probability 54% around 7 PM. Atmospheric instability is elevated (CAPE up to 1330 J/kg) — isolated convective development possible. Sunrise: 5:38AM · Sunset: 8:10PM.

Alerts

Severe Thunderstorm Watch
Expires 7:00 PM
Severe Thunderstorm Watch
Expires 7:00 PM
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
Beach Hazards Statement
Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN
Expires 10:00 AM
46 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
48%
7 PM
26°
53%
8 PM
24°
35%
9 PM
24°
35%
10 PM
24°
51%
11 PM
24°
50%
12 AM
24°
31%
1 AM
23°
7%
2 AM
23°
7%
3 AM
22°
16%
4 AM
22°
16%
5 AM
21°
14%
6 AM
20°
14%
7 AM
20°
24%
8 AM
21°
24%
9 AM
22°
3%
10 AM
22°
3%
11 AM
22°
4%
12 PM
23°
4%
1 PM
22°
4%
2 PM
22°
4%
3 PM
22°
4%
4 PM
22°
3%
5 PM
23°
3%
7-Day Forecast
Tonight
28° 20°
Thunderstorm, 48% chance.
Tue
24° 18°
Haze with a 31% chance of rain.
Wed
27° 17°
Clear.
Thu
28° 18°
Clear with a 41% chance of rain.
Fri
23° 19°
Rain, 57% chance.
Sat
23° 18°
Rain, 70% chance.
Sun
24° 17°
Clear with a 33% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 24° Thunderstorm 48% 12 mph SSW 82%
7 PM 26° Mostly Clear 53% 10 mph SSW 82%
8 PM 24° Mostly Clear 35% 10 mph SSW 85%
9 PM 24° Partly Cloudy 35% 10 mph SSW 88%
10 PM 24° Heavy Rain 51% 10 mph SSW 89%
11 PM 24° Partly Cloudy 50% 9 mph SW 90%
12 AM 24° Partly Cloudy 31% 9 mph WSW 92%
1 AM 23° Mostly Clear 7% 10 mph W 92%
2 AM 23° Partly Cloudy 7% 10 mph NW 93%
3 AM 22° Partly Cloudy 16% 12 mph NNW 96%
4 AM 22° Haze 16% 14 mph NNW 97%
5 AM 21° Mostly Cloudy 14% 14 mph N 96%
6 AM 20° Haze 14% 14 mph N 95%
7 AM 20° Haze 24% 14 mph N 94%
8 AM 21° Mostly Cloudy 24% 14 mph N 91%
9 AM 22° Mostly Cloudy 3% 14 mph N 88%
10 AM 22° Mostly Cloudy 3% 14 mph N 85%
11 AM 22° Mostly Cloudy 4% 14 mph N 82%
12 PM 23° Mostly Cloudy 4% 15 mph N 80%
1 PM 22° Partly Cloudy 4% 15 mph N 78%
2 PM 22° Partly Cloudy 4% 15 mph NNW 76%
3 PM 22° Partly Cloudy 4% 16 mph NNW 75%
4 PM 22° Mostly Clear 3% 16 mph NNW 73%
5 PM 23° Clear 3% 16 mph NNW 74%
15-Day Forecast
Today
7/27
Thunderstorm
48%
20°
28°
Tue
7/28
Haze
31%
18°
24°
Wed
7/29
Clear
3%
17°
27°
Thu
7/30
Clear
41%
18°
28°
Fri
7/31
Rain
57%
19°
23°
Sat
8/1
Rain
70%
18°
23°
Sun
8/2
Clear
33%
17°
24°
Mon
8/3
Mostly Clear
30%
17°
27°
Tue
8/4
Thunderstorm
47%
19°
29°
Wed
8/5
Rain
66%
19°
26°
Thu
8/6
Rain
68%
18°
26°
Fri
8/7
Drizzle
60%
19°
26°
Sat
8/8
Rain
90%
19°
26°
Sun
8/9
Drizzle
60%
19°
25°
Mon
8/10
Drizzle
60%
19°
26°
46
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
46 AQI 8.2 µg/m³
O3
Ground-level ozone
41 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 46 Good 41 46
Wed 34 Good 34 19
Thu 34 Good 34 13
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, 21:00'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
SBCAPE511 J/kg
MLCAPE878 J/kg
MUCAPE1451 J/kg
SBCIN-381 J/kg
MLCIN0 J/kg
Lifted Index-3.6
Kinematics
0–6 km Shear56 kt
0–1 km Shear32 kt
Eff. Shear75 kt
0–1 km SRH357
0–3 km SRH338
Eff. SRH108
Storm Motion270° @ 38 kt
0–1 km EHI1.1
Composite Parameters
Sig. Tornado2.0
STP (eff)0.0
Supercell6.0
K-Index39.5
Thermo & Levels
PWAT2.01 in
0–3 km LR4.2 °C/km
700–500 LR7.1 °C/km
Total Totals51.5
LCL949 hPa
LFC631 hPa
EL280 hPa
Freezing Lvl14,701 ft