1 advisory is in effect for Sussex County, DE. The most serious is a coastal flood advisory.
Since 2016 the National Weather Service has issued about 1,287 alerts that included Sussex County, roughly 129 a year. The most common is the severe thunderstorm warning (253 from 2016 to 2025). The last tornado warning was issued on July 29, 2026. 25 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
Inland Sussex; Delaware BeachesUntil · NWS Mount Holly NJ
COASTAL FLOOD ADVISORY NOW IN EFFECT UNTIL 4 PM EST THIS AFTERNOON
Full alert text
* WHAT...Up to one half foot of inundation above ground level
expected in low-lying areas near shorelines and tidal
waterways.
* WHERE...Inland Sussex and Delaware Beaches.
* WHEN...Until 4 PM EST this afternoon.
* IMPACTS...Flooding of lots, parks, and roads with only
isolated road closures expected.
* ADDITIONAL DETAILS...Flooding will be mainly confined to back
bay areas where water levels remain elevated.
What to do: A Coastal Flood Advisory means that minor tidal flooding is
expected. Minor tidal flooding often results in some road
closures. Usually, the most vulnerable roadways will flood.
Do not leave your vehicle at a location that is prone to tidal
flooding. Do not drive your vehicle through flood waters. The
water may be deeper than you think it is. You will be putting
yourself in danger and your vehicle may be damaged, leading to
costly repairs.
Visit the National Water Prediction Service at
https://water.noaa.gov/wfo/phi for additional water level and
flood impact information for your local tide gauge.
Map data: NWS, OpenFreeMap, OpenStreetMap
Recent alerts in Sussex County
Issued
Alert
Area
Nov 14, 3:41 AM EST
Coastal Flood Advisory
Ocean; Coastal Ocean
Sussex County alert history
Alert events that included Sussex County or its forecast zones, from the NWS warning archive.
25 tornadoes have been recorded in Sussex County since 1950, killing 1 people and injuring 2. That ranks 2 of 3 counties in Delaware. The most recent was on June 30, 2025 (rated EF0).