Severe Thunderstorm Watch 12:00 AM

DuPage County, Illinois, United States

Last updated: 10:12 PM CDT  ·  Refresh
22°C
Feels like 24°
Mostly Cloudy
▲ 26°  /  ▼ 16°
Wind
5 mph SW
Humidity
92%
Dew Point
20°
Pressure
29.14 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
69%
Sunrise
6:06 AM
Sunset
7:43 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: DuPage County is currently mostly cloudy at 22°C. Precipitation is likely — peak probability 62% around 11 PM. Atmospheric instability is elevated (CAPE up to 1352 J/kg) — isolated convective development possible. Sunrise: 6:06AM · Sunset: 7:43PM.

Alerts

Severe Thunderstorm Watch
Expires 12:00 AM
58 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
38%
11 PM
22°
62%
12 AM
22°
35%
1 AM
20°
5%
2 AM
20°
5%
3 AM
19°
6%
4 AM
19°
6%
5 AM
18°
6%
6 AM
17°
3%
7 AM
17°
3%
8 AM
19°
5%
9 AM
21°
5%
10 AM
22°
5%
11 AM
23°
5%
12 PM
24°
8%
1 PM
27°
9%
2 PM
27°
16%
3 PM
27°
16%
4 PM
27°
16%
5 PM
27°
5%
6 PM
27°
3%
7 PM
26°
3%
8 PM
25°
3%
9 PM
23°
3%
7-Day Forecast
Tonight
26° 16°
Mostly Cloudy with a 38% chance of rain.
Sat
27° 17°
Mostly Clear.
Sun
25° 16°
Partly Cloudy.
Mon
24° 14°
Partly Cloudy with a 37% chance of rain.
Tue
26° 14°
Rain, 64% chance.
Wed
28° 15°
Thunderstorm, 64% chance.
Thu
29° 17°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Mostly Cloudy 38% 5 mph SW 92%
11 PM 22° Partly Cloudy 62% 7 mph WSW 93%
12 AM 22° Partly Cloudy 35% 5 mph WSW 94%
1 AM 20° Partly Cloudy 5% 5 mph WSW 94%
2 AM 20° Partly Cloudy 5% 6 mph W 94%
3 AM 19° Partly Cloudy 6% 7 mph W 93%
4 AM 19° Partly Cloudy 6% 7 mph WNW 92%
5 AM 18° Partly Cloudy 6% 7 mph NW 91%
6 AM 17° Partly Cloudy 3% 8 mph NW 91%
7 AM 17° Partly Cloudy 3% 9 mph NW 89%
8 AM 19° Mostly Clear 5% 10 mph NW 80%
9 AM 21° Clear 5% 10 mph NW 72%
10 AM 22° Clear 5% 10 mph NW 65%
11 AM 23° Clear 5% 10 mph NW 61%
12 PM 24° Clear 8% 11 mph NW 57%
1 PM 27° Mostly Clear 9% 11 mph WNW 54%
2 PM 27° Mostly Clear 16% 12 mph WNW 53%
3 PM 27° Mostly Clear 16% 12 mph WNW 53%
4 PM 27° Partly Cloudy 16% 12 mph NW 53%
5 PM 27° Mostly Clear 5% 12 mph WNW 56%
6 PM 27° Mostly Clear 3% 10 mph WNW 60%
7 PM 26° Mostly Clear 3% 10 mph NW 62%
8 PM 25° Mostly Clear 3% 9 mph NW 66%
9 PM 23° Mostly Clear 3% 8 mph NW 69%
15-Day Forecast
Today
8/21
Mostly Cloudy
38%
16°
26°
Sat
8/22
Mostly Clear
16%
17°
27°
Sun
8/23
Partly Cloudy
3%
16°
25°
Mon
8/24
Partly Cloudy
37%
14°
24°
Tue
8/25
Rain
64%
14°
26°
Wed
8/26
Thunderstorm
64%
15°
28°
Thu
8/27
Drizzle
52%
17°
29°
Fri
8/28
Clear
31%
19°
29°
Sat
8/29
Rain
68%
18°
29°
Sun
8/30
Rain
68%
21°
28°
Mon
8/31
Drizzle
60%
21°
32°
Tue
9/1
Drizzle
60%
21°
32°
Wed
9/2
Drizzle
60%
20°
28°
Thu
9/3
Drizzle
60%
19°
27°
Fri
9/4
Drizzle
60%
19°
28°
58
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
58 AQI 12.7 µg/m³
O3
Ground-level ozone
38 AQI 42 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 58 Moderate 38 58
Sun 31 Good 31 26
Mon 25 Good 25 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 Sat Aug 22, 01:00'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
SBCAPE1449 J/kg
MLCAPE1834 J/kg
MUCAPE2289 J/kg
SBCIN-85 J/kg
MLCIN-28 J/kg
Lifted Index-4.5
Kinematics
0–6 km Shear32 kt
0–1 km Shear17 kt
Eff. Shear30 kt
0–1 km SRH128
0–3 km SRH157
Eff. SRH157
Storm Motion335° @ 17 kt
0–1 km EHI1.2
Composite Parameters
Sig. Tornado0.7
STP (eff)1.0
Supercell5.6
K-Index35.2
Thermo & Levels
PWAT1.67 in
0–3 km LR5.8 °C/km
700–500 LR6.3 °C/km
Total Totals52.3
LCL957 hPa
LFC800 hPa
EL219 hPa
Freezing Lvl11,975 ft