Unimak Pass, North Approach tidal current predictions

Now

Flood 1.0 ktToward NNW (330°)

Next slack

10:26 PMAKDT

Next max flood

0.2 kt12:27 PM

Next max ebb

0.6 ktTue 12:27 AM

Knots along the channel: above the line the flood, running in toward NNW (330°); below it the ebb, running out toward SE (132°). Times are Alaska Daylight Time. Today: slack 1:30 AM, flood 2.0 kt 6:23 AM, flood 0.2 kt 12:27 PM, flood 1.9 kt 6:07 PM, slack 10:26 PM.

• Small Craft Advisory Small Craft Advisory issued September 28 at 2:40AM AKDT until September 28 at 5:00PM AKDT by NWS Anchorage AKUntil 5:00 PM
  Full text

  Coastal Waters Forecast for Southwest Alaska+Bristol Bay+The Alaska Peninsula Waters and the Aleutian Islands up to 100 nm out. Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. .TODAY...NW wind 25 kt. Seas 8 ft. .TONIGHT...NW wind 20 kt. Seas 7 ft. .TUE...NW wind 15 kt. Seas 5 ft. .TUE NIGHT...SW wind 20 kt. Seas 4 ft. .WED...S wind 20 kt. Seas 5 ft. .THU...NE wind 35 kt. Seas 7 ft. .FRI...NE wind 30 kt. Seas 6 ft.

• Small Craft Advisory Small Craft Advisory issued September 27 at 3:32PM AKDT until September 28 at 5:00PM AKDT by NWS Anchorage AKUntil 5:00 PM
  Full text

  Coastal Waters Forecast for Southwest Alaska+Bristol Bay+The Alaska Peninsula Waters and the Aleutian Islands up to 100 nm out. Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. .TONIGHT...NW wind 25 kt. Seas 9 ft. .MON...NW wind 25 kt. Seas 8 ft. .MON NIGHT...NW wind 20 kt. Seas 7 ft. .TUE...W wind 15 kt. Seas 5 ft. .TUE NIGHT...SW wind 20 kt. Seas 4 ft. .WED...W wind 20 kt. Seas 5 ft. .THU THROUGH FRI...N wind 30 kt. Seas 6 ft.

• Small Craft Advisory Small Craft Advisory issued September 27 at 3:59AM AKDT until September 28 at 5:00PM AKDT by NWS Anchorage AKUntil 5:00 PM
  Full text

  Coastal Waters Forecast for Southwest Alaska+Bristol Bay+The Alaska Peninsula Waters and the Aleutian Islands up to 100 nm out. Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. .TODAY...W wind 25 kt. Seas 9 ft. .TONIGHT...NW wind 25 kt. Seas 9 ft. .MON...NW wind 25 kt. Seas 8 ft. .MON NIGHT...NW wind 20 kt. Seas 7 ft. .TUE...W wind 15 kt. Seas 5 ft. .WED...NW wind 20 kt. Seas 5 ft. .THU...NE wind 30 kt. Seas 6 ft.

The flood is the tidal current running in from the sea, the ebb the current running back out. Slack water is the short turn between them, when the current is weakest: the time to cross a strong channel, anchor, or dive. Slack in a channel is not the time of high or low tide; it can come hours after.

Speeds are knots along the channel's main axis, and directions are degrees true toward which the water flows, as NOAA prints its tables. A current against the wind stands the waves up steep and close together.

Predictions are astronomical: the moon and the sun, not the weather. Strong wind, river flow after heavy rain and storm surge all change the real current.

• Unimak Pass, West ApproachHarmonic current station12 mi
• Unimak PassHarmonic current station17 mi
• Unimak Pass, 2.4 miles N of Tanginak ISubordinate current station17 mi
• Ugamak Strait (North end)Subordinate current station19 mi
• Ugamak Strait, off Kaligagan IslandHarmonic current station22 mi

• Tide times at Cape Sarichef 12 mi
• Tide times at Scotch Cap 14 mi
• Tide times at Tigalda Bay, Tigalda Island 23 mi
• Forecast for Akutan, AK
• Open the live map with tidal currents
• All tidal current stations in Alaska

Tidal current predictions from NOAA’s Center for Operational Oceanographic Products and Services (CO-OPS), station UNI1004, bin 12: original at NOAA. Marine alerts from the National Weather Service.