National Weather ServiceIllinoisLakeshore Flood AdvisoryArchive to October 1, 2026
Lakeshore Flood Advisories in Illinois
The National Weather Service issued 0 lakeshore flood advisories for Illinois in 2025 and 3 a year on average in 2008-2025; in 2021-2025 it had the 3rd most of any state. 2026 through September: 0, 100% below the average of 2 for those months in 2008-2025. Lake was covered most often (38 times since 2008).
How many lakeshore flood advisories does Illinois get?
Every lakeshore flood advisory that covered part of Illinois. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 0 |
| 2025 | 0 |
| 2024 | 1 |
| 2023 | 1 |
| 2022 | 1 |
| 2021 | 7 |
| 2020 | 15 |
| 2019 | 17 |
| 2018 | 4 |
| 2017 | 1 |
| 2016 | 2 |
| 2015 | 5 |
| 2014 | 1 |
| 2013 | 0 |
| 2012 | 0 |
| 2011 | 1 |
| 2010 | 0 |
| 2009 | 2 |
| 2008 | 0 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Illinois get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Illinois?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Lake | 38 | 1 | August 27, 2024 |
| Cook | 34 | 0 | February 13, 2020 |
| Central Cook | 21 | 2 | August 27, 2024 |
| Northern Cook | 20 | 2 | August 27, 2024 |
| Southern Cook | 1 | 0 | February 17, 2022 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
What is a lakeshore flood advisory?
A lakeshore flood advisory covers minor flooding along a Great Lakes shore, such as water over low shore roads and beaches. An advisory is issued for a hazard less serious than a warning that can still cause inconvenience or danger if people are not careful. The national record · Every warning type in Illinois.