Severe Thunderstorm Watch 12:00 AM Flash Flood Warning — La Salle County, IL 12:00 AM Flood Advisory — La Salle County, IL 12:00 AM

LaSalle County, Illinois, United States

Last updated: 11:22 PM CDT  ·  Refresh
21°C
Feels like 22°
Mostly Cloudy
▲ 28°  /  ▼ 16°
Wind
6 mph WSW
Humidity
95%
Dew Point
20°
Pressure
29.30 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
61%
Sunrise
6:10 AM
Sunset
7:45 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: LaSalle County is currently mostly cloudy at 21°C. Precipitation is likely — peak probability 60% around 11 PM. Atmospheric instability is elevated (CAPE up to 1779 J/kg) — isolated convective development possible. Sunrise: 6:10AM · Sunset: 7:45PM.

Alerts

Severe Thunderstorm Watch
Expires 12:00 AM
Flash Flood Warning
La Salle County, IL
Expires 12:00 AM
Flood Advisory
La Salle County, IL
Expires 12:00 AM
41 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
59%
12 AM
21°
33%
1 AM
20°
4%
2 AM
19°
4%
3 AM
19°
5%
4 AM
18°
8%
5 AM
17°
8%
6 AM
16°
4%
7 AM
17°
4%
8 AM
18°
5%
9 AM
20°
8%
10 AM
22°
17%
11 AM
23°
17%
12 PM
24°
17%
1 PM
27°
17%
2 PM
27°
20%
3 PM
27°
20%
4 PM
27°
20%
5 PM
27°
5%
6 PM
26°
5%
7 PM
25°
3%
8 PM
24°
3%
9 PM
22°
3%
10 PM
21°
3%
7-Day Forecast
Tonight
28° 16°
Mostly Cloudy with a 59% chance of rain.
Sat
27° 14°
Mostly Clear with a 20% chance of rain.
Sun
24° 13°
Clear.
Mon
23° 13°
Mostly Cloudy with a 44% chance of rain.
Tue
24° 13°
Rain, 64% chance.
Wed
27° 16°
Thunderstorm, 64% chance.
Thu
27° 17°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Mostly Cloudy 59% 6 mph WSW 95%
12 AM 21° Mostly Clear 33% 6 mph WSW 96%
1 AM 20° Mostly Clear 4% 6 mph W 96%
2 AM 19° Mostly Clear 4% 7 mph WNW 96%
3 AM 19° Mostly Clear 5% 7 mph WNW 95%
4 AM 18° Partly Cloudy 8% 7 mph WNW 94%
5 AM 17° Partly Cloudy 8% 7 mph NW 94%
6 AM 16° Partly Cloudy 4% 7 mph NW 95%
7 AM 17° Partly Cloudy 4% 7 mph NW 94%
8 AM 18° Mostly Clear 5% 8 mph NNW 90%
9 AM 20° Mostly Clear 8% 8 mph NW 86%
10 AM 22° Mostly Clear 17% 9 mph NW 81%
11 AM 23° Mostly Clear 17% 9 mph NW 75%
12 PM 24° Clear 17% 10 mph NW 70%
1 PM 27° Clear 17% 11 mph WNW 68%
2 PM 27° Mostly Clear 20% 12 mph WNW 68%
3 PM 27° Mostly Clear 20% 12 mph WNW 68%
4 PM 27° Partly Cloudy 20% 12 mph NW 68%
5 PM 27° Mostly Clear 5% 11 mph NW 69%
6 PM 26° Mostly Clear 5% 10 mph NW 71%
7 PM 25° Mostly Clear 3% 10 mph NW 69%
8 PM 24° Mostly Clear 3% 9 mph NW 71%
9 PM 22° Clear 3% 9 mph NW 72%
10 PM 21° Clear 3% 8 mph NW 74%
15-Day Forecast
Today
8/21
Mostly Cloudy
59%
16°
28°
Sat
8/22
Mostly Clear
20%
14°
27°
Sun
8/23
Clear
3%
13°
24°
Mon
8/24
Mostly Cloudy
44%
13°
23°
Tue
8/25
Rain
64%
13°
24°
Wed
8/26
Thunderstorm
64%
16°
27°
Thu
8/27
Drizzle
52%
17°
27°
Fri
8/28
Clear
17%
17°
27°
Sat
8/29
Thunderstorm
68%
17°
28°
Sun
8/30
Drizzle
44%
19°
28°
Mon
8/31
Drizzle
60%
19°
31°
Tue
9/1
Drizzle
60%
18°
31°
Wed
9/2
Drizzle
60%
18°
27°
Thu
9/3
Drizzle
60%
17°
27°
Fri
9/4
Drizzle
60%
17°
27°
41
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
41 AQI 7.4 µg/m³
O3
Ground-level ozone
32 AQI 36 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 41 Good 32 41
Sun 26 Good 26 25
Mon 21 Good 21 9
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, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE769 J/kg
MLCAPE1289 J/kg
MUCAPE1614 J/kg
SBCIN-103 J/kg
MLCIN-46 J/kg
Lifted Index-3.2
Kinematics
0–6 km Shear24 kt
0–1 km Shear14 kt
Eff. Shear23 kt
0–1 km SRH35
0–3 km SRH16
Eff. SRH16
Storm Motion344° @ 18 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.3
K-Index37.8
Thermo & Levels
PWAT1.73 in
0–3 km LR5.0 °C/km
700–500 LR6.5 °C/km
Total Totals49.9
LCL978 hPa
LFC773 hPa
EL237 hPa
Freezing Lvl12,812 ft