Thunderstorm wind is the standout hazard at First State National Historical Park, with 14 recorded events striking New Castle County — more than three times the frequency of any other weather incident in the data. Those storms have caused injuries in the area, and the same system that produces damaging gusts also fuels the four flash flood events on record, making fast-moving weather the primary threat for visitors.
When a storm cell builds, get away from the open meadows and tree lines immediately and shelter in your vehicle rather than a tent, since tents offer no protection against sudden high winds or flooding. Pack a NOAA weather radio or download the NWS app before you arrive, as cell coverage in rural Delaware can be unreliable during the fast-moving storms typical of this corridor. If you're parked in a low-lying lot, move to higher ground before heavy rain arrives — flash floods here can develop within minutes.
Top recorded hazards in New Castle County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Thunderstorm Wind 14
- Flash Flood 4
- Flood 1
- Tornado 1
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About First State National Historical Park
Famous as the First State to ratify the Constitution, Delaware was born out of a conflict among three world powers for dominance of the Delaware Valley. From this beginning, the region developed a distinct character that tolerated diversity in religion and national origin and valued independence.
Weather
For details and information, visit, http://www.nps.gov/frst/index.htm.