Alert archive / Delaware / Heat Advisories
Heat Advisories in Delaware, 2026
9 heat advisories in 2026. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of heat advisories reaches back to 2005.
Heat Advisories by county
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Heat Advisories
- 9
- Busiest month
- July4 heat advisories
- Busiest day
- May 18, 20261 heat advisories
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 2:52 AM EDT | Heat Advisory | PHI | New Castle | 64 hr |
| Jun 10, 2:24 AM EDT | Heat Advisory | PHI | New Castle | 66 hr |
| Jul 4, 10:52 PM EDT | Heat Advisory | PHI | Kent, New Castle, Sussex | 21 hr |
| Jul 13, 2:45 PM EDT | Heat Advisory | PHI | Kent, Sussex | 53 hr |
| Jul 16, 12:10 AM EDT | Heat Advisory | PHI | New Castle | 20 hr |
| Jul 18, 2:12 AM EDT | Heat Advisory | PHI | Sussex | 17 hr |
| Aug 5, 1:50 PM EDT | Heat Advisory | PHI | New Castle | 3 days |
| Sep 1, 2:30 AM EDT | Heat Advisory | PHI | New Castle | 18 hr |
| Sep 2, 3:53 AM EDT | Heat Advisory | PHI | Kent, New Castle, Sussex | 40 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.