Mode · Coastal Alerts

Coastal event alerts

A unified, human-readable feed of upcoming high-impact coastal events: king tides, storm surge risk, extreme minus tides, and unusually high wave events. Designed to give mariners and coastal land users early warning without having to scan multiple data sources.

King tides
Annual
Highest predicted tides of the year
Storm surge
NOAA/NWS
Elevated water from storm systems
Minus tides
≤ -2 ft
Extreme low-tide events
Wave events
≥ 12 ft
Gulf of Alaska swell
Event categories (planned)
King tides
PERIGEAN
Highest predicted tides of the year
Cook Inlet king tides can flood the Spit and downtown Homer
Storm surge
NWS
Wind-driven water elevation
Aleutian storms can add 2–4 ft of surge on top of predicted tides
Extreme minus tides
SUB-ZERO
MLLW below -2 ft
Clamming mode →
High wave events
BUOY
Gulf / Bering swell > 12 ft
Conditions mode →