INSTRUCTIONS

A Coastal Flood Warning means that flooding is occurring or imminent. Coastal residents in the warned area should be alert for rising water and take appropriate action to protect life and property.

Feet Above Ground is locally defined as feet above the Highest Astronomical Tide or HAT.

DESCRIPTION

* WHAT…For the Coastal Flood Warning, High astronomical tides and large surf will cause moderate to major flooding in low lying areas along the Redwood, around Humboldt Coast, and Mendocino Coast. Up to one half foot of saltwater inundation above ground level is possible in low lying areas near shorelines and tidal waterways. Between 9.1 and 9.4 feet MLLW at the Crescent City tide gauge is predicted. Between 9.8 and 10.1 feet MLLW at the north spit tide gauge is predicted. Between 8.3 to 8.6 feet MLLW at the Pt Arena tide gauge is predicted. For the Coastal Flood Watch, High astronomical tides and large surf may cause moderate/major flooding in low lying areas along the Redwood, around Humboldt Coast, and Mendocino Coast. Up to one half foot of saltwater inundation above ground level is possible in low lying areas near shorelines and tidal waterways.

* WHERE…Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt and Mendocino Coast Counties.

* WHEN…For the Coastal Flood Warning, from 7 AM to noon PST Friday. For the Coastal Flood Watch, from Saturday morning through Sunday afternoon. High tide is at 8:54 am at PT Arena tide gauge, at 9:41 am at the Crescent City tide gauge, and at 9:53 am at the Humboldt Bay North Spit tide gauge. Saltwater inundation will be possible 1 to 2 hours before and after high tide.

* IMPACTS…Several coastal roads may be closed. Low lying property and some critical infrastructure will be inundated. These impacts will include, but not limited to, roadways in King Salmon and the Arcata bottoms, and sections of highway 1 and 101. Shoreline erosion will occur.