Sussex County, Delaware

Sussex County, Delaware weather, flood and hazard sources

Forecasts and warnings for Sussex County, Delaware come from the National Weather Service office in Mount Holly, New Jersey (Philadelphia/Mt Holly). Inland Sussex is zone DEZ003 and the Delaware Beaches are zone DEZ004. This page shows no live data; it links to where live data and official flood and hazard information live.

Which NWS office covers Sussex County?

The forecast for the Georgetown area is issued by the Philadelphia/Mt Holly (PHI) office, and so is the forecast near Rehoboth Beach. The office's home page lists it as Mount Holly, NJ.

Zone code	Area	Source
DEZ003	Inland Sussex	NWS text product archive; county EOC page
DEZ004	Delaware Beaches (Atlantic coastal Sussex)	NWS text product archive; NWS point forecast

The archive is a copy of an NWS Hazardous Weather Outlook that lists DEZ001 New Castle, DEZ002 Kent, DEZ003 Inland Sussex and DEZ004 Delaware Beaches. Confirm current zones on weather.gov.

Forecasts and warnings

NWS Philadelphia/Mt Holly (office page): The forecast office page. The NWS lists the office as Philadelphia/Mt Holly, Mount Holly, NJ.https://www.weather.gov/phi/
Inland Sussex forecast (DEZ003): Point forecast page that the county's Emergency Operations Center links as its local weather advisory.https://forecast.weather.gov/MapClick.php?zoneid=DEZ003
Delaware Beaches forecast (DEZ004): Forecast for a point near Rehoboth Beach; the page shows the Philadelphia/Mt Holly office and zone DEZ004.https://forecast.weather.gov/MapClick.php?lat=38.7&lon=-75.08

Emergency management

Delaware Emergency Management Agency: State agency that coordinates emergency preparedness, training, response, recovery and mitigation.https://dema.delaware.gov/
Delaware Emergency Notification System (DENS): State alert system. The county names DENS as its primary public warning system.https://dema.delaware.gov/preparedness/index.shtml?dc=dens
Sussex County Emergency Operations Center: County 911 dispatch and emergency operations, with the county Emergency Operations Plan.https://sussexcountyde.gov/emergency-operations-center

Flood and coastal

FEMA Flood Map Service Center: Official flood hazard maps for the National Flood Insurance Program, searchable by address.https://msc.fema.gov/portal/home
FEMA flood zones explainer: FEMA's plain-language explanation of flood zones and Special Flood Hazard Areas on Flood Insurance Rate Maps.https://fema.gov/flood-zones
Delaware Flood Planning Tool: DNREC interactive flood risk map; DNREC says it is for reference only and does not capture all flood-prone areas.https://floodplanning.dnrec.delaware.gov/
NOAA station 8557380, Lewes, Ft. Miles: Tide benchmark and datum page for the Lewes station.https://tidesandcurrents.noaa.gov/benchmarks/8557380.html
NOAA water levels, station 8557380: Measured water levels in chart and table form for the station ID in the URL.https://tidesandcurrents.noaa.gov/waterlevels.html?id=8557380
USGS Water Data for Delaware: Current water condition data from the state's USGS monitoring locations; marked provisional.https://waterdata.usgs.gov/de/nwis/rt

Evacuation

Know Your Zone (PrepareDE): Delaware evacuation zones labeled A through D, with a lookup tool and interactive zone map.https://preparede.org/know-your-zone/
DelDOT Sussex County evacuation annex: DelDOT's February 2023 plan for managing roads during coastal evacuation of Sussex County.https://deldot.gov/Programs/itms/pdfs/evacuation-plans/2023%20Sussex%20County%20Evacuation%20Plan.pdf
Sussex County hurricane and flood safety: County page that links evacuation plans, the FEMA evacuation booklet and the Flood Planning Tool.https://sussexcountyde.gov/hurricane-information

Air quality

AirNow: Current and forecast air quality index, run by EPA and partners.https://www.airnow.gov/
DNREC air quality monitoring: Delaware's permanent monitoring stations, including Lewes and Seaford in Sussex County.https://dnrec.delaware.gov/air/quality/monitoring

All official sources are on the sources index. County facts are on Sussex County key facts. This page does not show live conditions or forecasts, and nothing here replaces an official warning. Follow DEMA, the county and the National Weather Service during an emergency.