National Weather ServiceDelawareSevere Thunderstorm WarningArchive to October 1, 2026
Severe Thunderstorm Warnings in Delaware
The National Weather Service issued 63 severe thunderstorm warnings for Delaware in 2025 and 56 a year on average in 2008-2025; in 2021-2025 it had the 44th most of any state. 2026 through September: 94, 76% above the average of 54 for those months in 2008-2025. New Castle was covered most often (589 times since 2008).
How many severe thunderstorm warnings does Delaware get?
Every severe thunderstorm warning that covered part of Delaware. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 94 |
| 2025 | 63 |
| 2024 | 33 |
| 2023 | 80 |
| 2022 | 46 |
| 2021 | 63 |
| 2020 | 85 |
| 2019 | 103 |
| 2018 | 35 |
| 2017 | 62 |
| 2016 | 53 |
| 2015 | 36 |
| 2014 | 38 |
| 2013 | 33 |
| 2012 | 46 |
| 2011 | 67 |
| 2010 | 48 |
| 2009 | 55 |
| 2008 | 56 |
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 | 589 | 139 | September 2, 2026 |
| Kent | 520 | 126 | September 4, 2026 |
| Sussex | 439 | 118 | September 4, 2026 |
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 severe thunderstorm warnings for Delaware in AreaZine's record
NWS Mount HollyWarningSeptember 3, 2026
Severe Thunderstorm Warning: Kent, Caroline, Kent and 2 more, DE and MD
Expired 12:45 a.m. EDT, September 3, 2026
NWS Mount HollyWarningSeptember 2, 2026
Severe Thunderstorm Warning: Kent, Sussex and Caroline, DE and MD
Expired 3:45 p.m. EDT, September 2, 2026
NWS Mount HollyWarningSeptember 2, 2026
Severe Thunderstorm Warning: Kent and New Castle, DE
Expired 2:15 p.m. EDT, September 2, 2026
NWS Mount HollyWarningSeptember 1, 2026
Severe Thunderstorm Warning: Kent, New Castle, Sussex and 3 more, DE and MD
Expired 10:45 p.m. EDT, September 1, 2026
NWS Mount HollyWarningAugust 20, 2026
Severe Thunderstorm Warning: Kent, Sussex, Caroline and 2 more, DE and MD
Expired 7:00 p.m. EDT, August 20, 2026
NWS Mount HollyWarningAugust 20, 2026
Severe Thunderstorm Warning: New Castle, Burlington, Camden and 7 more, DE and NJ
Expired 7:00 p.m. EDT, August 20, 2026
NWS Mount HollyWarningAugust 20, 2026
Severe Thunderstorm Warning: Kent, New Castle, Cumberland and 2 more, DE and NJ
Expired 7:00 p.m. EDT, August 20, 2026
NWS Mount HollyWarningAugust 20, 2026
Severe Thunderstorm Warning: New Castle, Gloucester, Salem and 6 more, DE and NJ
Expired 6:15 p.m. EDT, August 20, 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 severe thunderstorm warning?
A severe thunderstorm warning means a storm is producing, or is about to produce, hail one inch across or larger and/or winds of 58 mph or more. 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.