LaSalle County weather alerts
There are no active weather alerts for LaSalle County, IL right now.
Since 2016 the National Weather Service has issued about 1,169 alerts that included LaSalle County, roughly 117 a year. The most common is the flood advisory (221 from 2016 to 2025). The last tornado warning was issued on August 12, 2026. 66 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include LaSalle County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring DeKalb County, Marshall County, Kendall County, Grundy County.
LaSalle County alert history
Alert events that included LaSalle County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Flood Advisory | 221 | 21 | September 20, 2026 |
| Severe Thunderstorm Warning | 163 | 34 | August 22, 2026 |
| Flood Warning | 145 | 19 | October 2, 2026 |
| Dense Fog Advisory | 98 | 7 | September 10, 2026 |
| Winter Weather Advisory | 88 | 2 | March 16, 2026 |
| Severe Thunderstorm Watch | 74 | 13 | August 21, 2026 |
| Wind Advisory | 67 | 6 | April 27, 2026 |
| Flood Watch | 51 | 15 | October 1, 2026 |
| Cold Weather Advisory | 32 | 3 | January 26, 2026 |
| Tornado Watch | 29 | 6 | June 17, 2026 |
| Heat Advisory | 24 | 5 | September 4, 2026 |
| Frost Advisory | 20 | 4 | October 17, 2026 |
| Tornado Warning | 19 | 10 | August 12, 2026 |
| Freeze Warning | 19 | 1 | April 20, 2026 |
| Flash Flood Warning | 18 | 8 | September 20, 2026 |
| Winter Storm Watch | 17 | 0 | November 29, 2025 |
| Winter Storm Warning | 14 | 0 | November 29, 2025 |
| Red Flag Warning | 11 | 1 | February 18, 2026 |
| Freeze Watch | 9 | 1 | April 20, 2026 |
| High Wind Warning | 8 | 1 | March 13, 2026 |
| Extreme Heat Warning | 7 | 2 | July 27, 2026 |
| Fire Weather Watch | 7 | 1 | February 18, 2026 |
| Extreme Heat Watch | 6 | 0 | July 23, 2025 |
| Extreme Cold Warning | 6 | 1 | January 23, 2026 |
| High Wind Watch | 5 | 0 | March 15, 2025 |
| Ice Storm Warning | 3 | 0 | January 1, 2021 |
| Dust Storm Warning | 3 | 0 | May 16, 2025 |
| Extreme Cold Watch | 2 | 1 | January 23, 2026 |
| Snow Squall Warning | 2 | 0 | February 19, 2022 |
| Blizzard Warning | 1 | 0 | November 26, 2018 |
Tornado history in LaSalle County
66 tornadoes have been recorded in LaSalle County since 1950, killing 13 people and injuring 179. That ranks 11 of 102 counties in Illinois. The most recent was on July 14, 2024 (rated unknown).
Strongest tornadoes in LaSalle County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| November 17, 2013 | EF4 | Tazewell County | 46.4 mi | 880 yd | 3 | 125 |
| April 20, 2004 | F3 | Putnam County | 15.8 mi | 880 yd | 8 | 12 |
| February 28, 2017 | EF3 | LaSalle County | 11.5 mi | 800 yd | 2 | 14 |
| February 28, 2017 | EF3 | Woodford County | 17.8 mi | 600 yd | 0 | 0 |
| June 30, 1977 | F3 | LaSalle County | 6.1 mi | 850 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 14, 2024 | ? | LaSalle County | 3.9 mi | 100 yd | 0 | 0 |
| July 14, 2024 | ? | LaSalle County | 4.2 mi | 150 yd | 0 | 0 |
| July 28, 2023 | ? | LaSalle County | 1.7 mi | 20 yd | 0 | 0 |
| May 7, 2023 | ? | LaSalle County | 0.1 mi | 25 yd | 0 | 0 |
| October 11, 2021 | ? | LaSalle County | 0.4 mi | 40 yd | 0 | 0 |
About LaSalle County
- Population: 108,390 (2024 estimate)
- State: Illinois
- NOAA Weather Radio SAME code: 017099 (how to use it)