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, Illinois

Last updated: 11:21 PM CDT  ·  Refresh
21°C
Feels like 23°
Mostly Cloudy
▲ 28°  /  ▼ 15°
Wind
6 mph WSW
Humidity
96%
Dew Point
20°
Pressure
29.30 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
64%
Sunrise
6:11 AM
Sunset
7:46 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: LaSalle is currently mostly cloudy at 21°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1747 J/kg) — isolated convective development possible. Sunrise: 6:11AM · Sunset: 7:46PM.

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
38 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
38%
12 AM
21°
35%
1 AM
20°
4%
2 AM
19°
5%
3 AM
18°
5%
4 AM
18°
8%
5 AM
16°
8%
6 AM
16°
4%
7 AM
16°
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° 15°
Mostly Cloudy with a 38% chance of rain.
Sat
27° 15°
Mostly Clear with a 20% chance of rain.
Sun
24° 12°
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 38% 6 mph WSW 96%
12 AM 21° Mostly Clear 35% 5 mph W 96%
1 AM 20° Mostly Clear 4% 6 mph W 96%
2 AM 19° Mostly Clear 5% 6 mph WNW 95%
3 AM 18° Mostly Clear 5% 7 mph WNW 94%
4 AM 18° Mostly Clear 8% 7 mph NW 94%
5 AM 16° Mostly Clear 8% 7 mph NW 94%
6 AM 16° Mostly Clear 4% 6 mph NW 94%
7 AM 16° Mostly Clear 4% 7 mph NW 93%
8 AM 18° Mostly Clear 5% 8 mph NW 89%
9 AM 20° Mostly Clear 8% 8 mph NW 85%
10 AM 22° Mostly Clear 17% 8 mph NW 80%
11 AM 23° Clear 17% 10 mph NW 75%
12 PM 24° Clear 17% 11 mph WNW 70%
1 PM 27° Clear 17% 12 mph WNW 67%
2 PM 27° Mostly Clear 20% 12 mph WNW 68%
3 PM 27° Partly Cloudy 20% 12 mph WNW 69%
4 PM 27° Partly Cloudy 20% 11 mph NW 68%
5 PM 27° Partly Cloudy 5% 11 mph NW 69%
6 PM 26° Mostly Clear 5% 10 mph NW 70%
7 PM 25° Mostly Clear 3% 10 mph NW 68%
8 PM 24° Mostly Clear 3% 9 mph NW 69%
9 PM 22° Mostly Clear 3% 9 mph NW 70%
10 PM 21° Clear 3% 8 mph NW 72%
15-Day Forecast
Today
8/21
Mostly Cloudy
38%
15°
28°
Sat
8/22
Mostly Clear
20%
15°
27°
Sun
8/23
Clear
3%
12°
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°
26°
Sat
8/29
Thunderstorm
68%
16°
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°
26°
Fri
9/4
Drizzle
60%
17°
27°
38
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
38 AQI 6.9 µg/m³
O3
Ground-level ozone
31 AQI 34 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 38 Good 31 38
Sun 27 Good 27 25
Mon 22 Good 22 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
SBCAPE701 J/kg
MLCAPE1368 J/kg
MUCAPE1739 J/kg
SBCIN-107 J/kg
MLCIN-37 J/kg
Lifted Index-3.1
Kinematics
0–6 km Shear25 kt
0–1 km Shear15 kt
Eff. Shear24 kt
0–1 km SRH43
0–3 km SRH30
Eff. SRH30
Storm Motion342° @ 20 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.1
STP (eff)0.0
Supercell0.7
K-Index37.6
Thermo & Levels
PWAT1.73 in
0–3 km LR4.9 °C/km
700–500 LR6.5 °C/km
Total Totals50.3
LCL979 hPa
LFC756 hPa
EL246 hPa
Freezing Lvl12,867 ft