Kachemak Bay

PKZ741 · Coastal Waters Forecast, National Weather Service Anchorage Alaska · issued Sun, Sep 27, 3:49 PM AKDT

Tonight: Variable wind less than 10 kt becoming NE 10 kt after midnight. Seas 2 ft. Rain showers.

Kachemak Bay on the map

The zone and the zones around it, tinted where a marine warning or advisory is in force. Tap a neighboring zone to open its forecast.

Small Craft Advisory

Open the live map with marine zones and buoys

Now

The nearest stations reporting each, as of Mon, Sep 28, 1:02 AM AKDT.

Wind: SE 3 kt, gusts 5 kt at HMSA2
Waves: 1.0 ft at 8 s at 46108
Water: 49°F at 46108

Alerts in force

No marine warning or advisory is in force for this zone.

What is normally issued here: in the past year NWS Anchorage (eastern waters) issued 13 Gale Warnings, 5 Freezing Spray Warnings, 2 Storm Warnings, 80 Small Craft Advisories for this zone.

The forecast

Coastal Waters Forecast from National Weather Service Anchorage Alaska, issued Sun, Sep 27, 3:49 PM AKDT, valid until Mon, Sep 28, 4:30 AM AKDT. Wind in knots, seas in feet.

Tonight: Variable wind less than 10 kt becoming NE 10 kt after midnight. Seas 2 ft. Rain showers.
Monday: N wind 10 kt in the morning becoming variable less than 10 kt. Seas 2 ft.
Monday night: Variable wind less than 10 kt becoming E 10 kt after midnight. Seas 2 ft.
Tuesday and Tuesday night: W wind 10 kt. Seas 2 ft.
Wednesday: Variable wind less than 10 kt. Seas 2 ft.
Thursday: E wind 10 kt. Seas 2 ft.
Friday: NE wind 15 kt. Seas 2 ft.

Synopsis

Synopsis for the north gulf coast, kodiak island waters, cook inlet

A 989 mb low develops 80 nm NE of Kodiak City and moves to 90 nm SW of Seward at 990 mb by Mon morning. The low continues to 100 nm SSE of Middleton Island at 992 mb Mon afternoon before exiting into the eastern Gulf by Tue morning.

Buoys and stations nearby

The latest report from each station within reach of the zone, nearest first. Distances in nautical miles from the middle of the zone.

Station	Distance	Wind	Waves	Water	Air	Pressure	Reported
HMSA2 Homer Spit, AK	5 nm	SE 3 kt, gusts 5			47°F	990.8 hPa	Mon, Sep 28, 1:02 AM AKDT
46108 Lower Cook Inlet (204)	8 nm		1.0 ft at 8 s	49°F			Mon, Sep 28, 12:30 AM AKDT
OVIA2 9455500 - Seldovia, AK	10 nm			49°F		991.1 hPa	Mon, Sep 28, 12:48 AM AKDT
APXA2 Anchor Point, Kachemak Bay Reserve, AK	14 nm	ESE 3 kt			43°F	990.0 hPa	Sun, Sep 27, 11:45 PM AKDT
FILA2 Flat Island Light, AK	20 nm	E 4 kt, gusts 5			46°F	991.4 hPa	Mon, Sep 28, 1:00 AM AKDT
AMAA2 East Amatuli Island Light, AK	42 nm	NNW 7 kt, gusts 9			48°F	991.6 hPa	Mon, Sep 28, 1:00 AM AKDT

The past year

Warnings, watches and advisories the National Weather Service issued for this zone over the past 12 months, from the Iowa Environmental Mesonet’s archive.

Product	Issued	Most recent
Gale Warning	13	Wed, Jul 22, 2026, 3:46 PM AKDT
Freezing Spray Warning	5	Mon, Mar 16, 2026, 3:44 AM AKDT
Storm Warning	2	Wed, Oct 29, 2025, 4:24 AM AKDT
Small Craft Advisory	80	Fri, Sep 25, 2026, 4:55 AM AKDT

What this means

Marine forecasts give wind in knots (1 knot is 1.15 mph) and seas in feet, except the high seas forecasts, which give seas in meters. Seas are the significant wave height, the average of the highest third of the waves; individual waves may be more than twice that. On the Great Lakes the forecast gives waves, not seas. "Wave Detail" splits the seas into the wind waves and each swell, with its direction and period.

Each coastal office writes a Coastal Waters Forecast for the bays, sounds and ocean out to 20 to 60 nautical miles, or on the Great Lakes a Nearshore Marine Forecast within 5 nautical miles of shore; the Open Lakes Forecast covers the rest of each lake. The Ocean Prediction Center and the National Hurricane Center write the Offshore Waters Forecasts out to about 250 nautical miles, and the High Seas Forecasts beyond. Forecasts are issued at least twice a day and updated when they go wrong.

Small Craft Advisory: Winds or conditions hazardous to small boats. The thresholds are set by each NWS region: typically sustained winds or frequent gusts of 20 to 25 knots up to 33 knots, and seas of 5 to 7 feet or more.
Gale Warning: Sustained winds or frequent gusts of 34 to 47 knots, not from a tropical cyclone.
Storm Warning: Sustained winds or frequent gusts of 48 to 63 knots, not from a tropical cyclone.
Hurricane Force Wind Warning: Sustained winds or frequent gusts of 64 knots or more, not from a tropical cyclone.
Special Marine Warning: A thunderstorm or squall over the water with winds or gusts of 34 knots or more, hail of 3/4 inch or more, or a waterspout, for up to two hours.
Hazardous Seas Warning: Wave heights or steepness at or above the office’s warning threshold, when the wind alone does not warrant a warning.
Heavy Freezing Spray Warning: Spray freezing on a vessel at 2 cm (3/4 inch) an hour or more.
Tropical Storm and Hurricane Warnings: Tropical storm (34 to 63 knots) or hurricane (64 knots or more) conditions expected within 36 hours. Watches: possible within 48 hours.

Nearby

Open the live map with marine zones and buoys The hour-by-hour forecast for the middle of the zone Every Alaska zone

Sources

Coastal Waters Forecast CWFAER from National Weather Service Anchorage Alaska, issued Sun, Sep 27, 3:49 PM AKDT. Original at NWS. Buoy reports from the National Data Buoy Center. Past products from the Iowa Environmental Mesonet. Zone outlines from the NWS marine and offshore zone boundaries. Warnings and advisories from the NWS API, read 09:25 UTC. All public domain, from the National Weather Service.