National Weather ServiceDelawareFlood WarningArchive to October 1, 2026
Flood Warnings in Delaware
The National Weather Service issued 5 flood warnings for Delaware in 2025 and 17 a year on average in 2008-2025; in 2021-2025 it had the 46th most of any state. 2026 through September: 2, 83% below the average of 11 for those months in 2008-2025. New Castle was covered most often (249 times since 2008).
How many flood warnings does Delaware get?
Every flood warning that covered part of Delaware. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 2 |
| 2025 | 5 |
| 2024 | 27 |
| 2023 | 19 |
| 2022 | 2 |
| 2021 | 12 |
| 2020 | 31 |
| 2019 | 4 |
| 2018 | 30 |
| 2017 | 11 |
| 2016 | 19 |
| 2015 | 4 |
| 2014 | 12 |
| 2013 | 29 |
| 2012 | 14 |
| 2011 | 38 |
| 2010 | 18 |
| 2009 | 17 |
| 2008 | 9 |
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 Delaware 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 Delaware?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| New Castle | 249 | 42 | September 3, 2026 |
| Sussex | 45 | 9 | July 11, 2025 |
| Kent | 41 | 6 | July 13, 2024 |
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.
The latest flood warnings for Delaware in AreaZine's record
NWS Mount HollyWarningSeptember 3, 2026
Flood Warning: New Castle, Burlington, Camden and 7 more, DE and NJ
Expired 9:15 a.m. EDT, September 3, 2026
NWS Mount HollyWarningAugust 27, 2026
Flood Warning: New Castle, Gloucester, Salem and 1 more, DE and NJ
Expired 7:15 p.m. EDT, August 27, 2026
This list is AreaZine's record of the NWS alert feed, kept since April 6, 2026; the counts above come from the complete IEM archive.
Source: National Weather Service alerts (api.weather.gov).
What is a flood warning?
A flood warning means flooding is happening or about to happen. The NWS issues it both for rivers at forecast points (river flood warnings) and for areas where water ponds or runs off (areal flood warnings); AreaZine counts both. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. The national record · Every warning type in Delaware.