Severe Thunderstorm Warning — La Salle County, IL 9:45 PM Severe Thunderstorm Watch 10:00 PM Severe Thunderstorm Watch 10:00 PM Flash Flood Warning — La Salle County, IL 12:00 AM Areal Flood Advisory — La Salle County, IL 12:00 AM

LaSalle, Illinois

Last updated: 9:13 PM CDT  ·  Refresh
21°C
Feels like 22°
Heavy Rain
▲ 28°  /  ▼ 15°
Wind
8 mph S
Humidity
93%
Dew Point
20°
Pressure
29.30 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
72%
Sunrise
6:11 AM
Sunset
7:46 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: LaSalle is currently heavy rain at 21°C. Precipitation is likely — peak probability 60% around 10 PM. Atmospheric instability is elevated (CAPE up to 1790 J/kg) — isolated convective development possible. Sunrise: 6:11AM · Sunset: 7:46PM.

Alerts

Severe Thunderstorm Warning
La Salle County, IL
Expires 9:45 PM
Severe Thunderstorm Watch
Expires 10:00 PM
Severe Thunderstorm Watch
Expires 10:00 PM
Flash Flood Warning
La Salle County, IL
Expires 12:00 AM
Areal 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°
58%
10 PM
21°
60%
11 PM
21°
59%
12 AM
20°
33%
1 AM
19°
3%
2 AM
19°
3%
3 AM
18°
3%
4 AM
18°
4%
5 AM
17°
4%
6 AM
16°
5%
7 AM
16°
5%
8 AM
18°
5%
9 AM
20°
8%
10 AM
21°
17%
11 AM
23°
17%
12 PM
24°
18%
1 PM
26°
12%
2 PM
27°
20%
3 PM
27°
20%
4 PM
28°
20%
5 PM
27°
5%
6 PM
26°
5%
7 PM
25°
3%
8 PM
24°
3%
7-Day Forecast
Tonight
28° 15°
Heavy Rain, 58% chance.
Sat
28° 14°
Mostly Clear with a 33% chance of rain.
Sun
24° 12°
Mostly Clear.
Mon
22° 12°
Overcast with a 37% chance of rain.
Tue
24° 13°
Clear with a 64% chance of rain.
Wed
27° 16°
Thunderstorm, 64% chance.
Thu
27° 17°
Drizzle, 52% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Heavy Rain 58% 8 mph S 93%
10 PM 21° Rain 60% 8 mph W 93%
11 PM 21° Partly Cloudy 59% 7 mph W 96%
12 AM 20° Partly Cloudy 33% 6 mph W 96%
1 AM 19° Mostly Clear 3% 7 mph WNW 96%
2 AM 19° Mostly Clear 3% 7 mph WNW 95%
3 AM 18° Partly Cloudy 3% 8 mph WNW 95%
4 AM 18° Partly Cloudy 4% 8 mph NW 94%
5 AM 17° Partly Cloudy 4% 7 mph NW 94%
6 AM 16° Partly Cloudy 5% 7 mph NW 94%
7 AM 16° Partly Cloudy 5% 7 mph NW 93%
8 AM 18° Partly Cloudy 5% 8 mph NW 90%
9 AM 20° Mostly Clear 8% 8 mph NW 85%
10 AM 21° Mostly Clear 17% 9 mph NW 81%
11 AM 23° Mostly Clear 17% 10 mph NW 76%
12 PM 24° Mostly Clear 18% 11 mph NW 71%
1 PM 26° Mostly Clear 12% 11 mph WNW 67%
2 PM 27° Mostly Clear 20% 12 mph WNW 67%
3 PM 27° Mostly Clear 20% 12 mph NW 68%
4 PM 28° Partly Cloudy 20% 11 mph NW 69%
5 PM 27° Mostly Clear 5% 10 mph NW 70%
6 PM 26° Mostly Clear 5% 10 mph NW 72%
7 PM 25° Mostly Clear 3% 10 mph NW 70%
8 PM 24° Mostly Clear 3% 9 mph NW 72%
15-Day Forecast
Today
8/21
Heavy Rain
58%
15°
28°
Sat
8/22
Mostly Clear
33%
14°
28°
Sun
8/23
Mostly Clear
3%
12°
24°
Mon
8/24
Overcast
37%
12°
22°
Tue
8/25
Clear
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
Drizzle
68%
16°
28°
Sun
8/30
Drizzle
68%
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, 01:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1108 J/kg
MLCAPE2098 J/kg
MUCAPE2678 J/kg
SBCIN-170 J/kg
MLCIN-41 J/kg
Lifted Index-3.6
Kinematics
0–6 km Shear32 kt
0–1 km Shear22 kt
Eff. Shear32 kt
0–1 km SRH173
0–3 km SRH200
Eff. SRH200
Storm Motion329° @ 21 kt
0–1 km EHI1.2
Composite Parameters
Sig. Tornado0.7
STP (eff)1.5
Supercell8.9
K-Index31.8
Thermo & Levels
PWAT1.68 in
0–3 km LR5.2 °C/km
700–500 LR6.3 °C/km
Total Totals51.7
LCL975 hPa
LFC743 hPa
EL221 hPa
Freezing Lvl12,280 ft