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Atlantic Coast at Chatham Harbor (IN MLLW)

National Weather Service gauge CHTM3 · Massachusetts · Barnstable County · 41.6885, -69.9510

Stage at this gauge is reported IN MLLW.

Flood levels

Official flood levels at this gauge: action stage begins at 8.0 ft; minor flooding begins at 9.0 ft; moderate flooding begins at 11.5 ft; major flooding begins at 13.0 ft.

Action stage8.0 ft
Minor flooding9.0 ft
Moderate flooding11.5 ft
Major flooding13.0 ft

Highest recorded crests

What the water does

National Weather Service impact statements for this gauge, in the Weather Service's own words.

9.0 ftFlooding of lowest lying coastal areas is likely. Some immediate coastal roads may be flooded nearest the time of high tide. Large swells may also produce some localized beach erosion.
13.0 ftSignificant flooding of low lying coastal areas is expected from Chatham northward along the east shore of the Cape. Immediate coastal roads will be flooded for a time near high tide and significant beach erosion is likely. Localized evacuations of the most vulnerable coastal areas may be required.

Forecast office: NWS Norton · River Forecast Center: Northeast River Forecast Center.

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