Unimak Pass tidal current predictions

Now

Flood 2.3 ktToward W (280°)

Next slack

8:28 PMAKDT

Next max flood

2.0 ktSat 5:05 AM

Next max ebb

1.5 kt11:10 PM

Knots along the channel: above the line the flood, running in toward W (280°); below it the ebb, running out toward ESE (118°). Times are Alaska Daylight Time. Today: slack 1:14 AM, flood 1.6 kt 4:22 AM, slack 7:17 AM, ebb 2.1 kt 10:34 AM, slack 1:40 PM, flood 2.6 kt 4:50 PM, slack 8:28 PM, ebb 1.5 kt 11:10 PM.

• Gale Warning Gale Warning issued September 25 at 3:30PM AKDT until September 26 at 5:00PM AKDT by NWS Anchorage AKUntil Sat 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...SW wind 45 kt. Seas 18 ft. Rain showers. .SAT...SW wind 40 kt. Seas 20 ft. .SAT NIGHT...W wind 30 kt. Seas 16 ft. .SUN AND SUN NIGHT...NW wind 30 kt. Seas 11 ft. .MON...NW wind 25 kt. Seas 10 ft. .TUE...W wind 20 kt. Seas 5 ft. .WED...E wind 20 kt. Seas 4 ft.

• Gale Warning Gale Warning issued September 25 at 5:09AM AKDT until September 26 at 5:00PM AKDT by NWS Anchorage AKUntil Sat 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...SW wind 35 kt. Seas 19 ft. Rain showers. .TONIGHT...SW wind 45 kt. Seas 21 ft. Rain showers. .SAT...SW wind 40 kt. Seas 22 ft. .SAT NIGHT...W wind 35 kt. Seas 16 ft. .SUN...NW wind 30 kt. Seas 11 ft. .MON...NW wind 25 kt. Seas 11 ft. .TUE...W wind 20 kt. Seas 5 ft.

• Gale Warning Gale Warning issued September 24 at 3:09PM AKDT until September 26 at 5:00AM AKDT by NWS Anchorage AKUntil Sat 5:00 AM
  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...SW wind 35 kt increasing to 45 kt after midnight. Seas 18 ft. Rain showers. .FRI...SW wind 35 kt. Seas 19 ft. Rain showers. .FRI NIGHT...SW wind 45 kt. Seas 21 ft. Rain showers. .SAT...W wind 45 kt. Seas 22 ft. .SAT NIGHT...W wind 35 kt. Seas 16 ft. .SUN...NW wind 25 kt. Seas 10 ft. .MON THROUGH TUE...W wind 20 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, East EntranceHarmonic current station9.3 mi
• Ugamak Strait (North end)Subordinate current station10 mi
• Ugamak Strait, off Kaligagan IslandHarmonic current station12 mi
• Unimak Pass, North ApproachHarmonic current station17 mi
• Unimak Pass, 2.4 miles N of Tanginak ISubordinate current station23 mi

• Tide times at Scotch Cap 5.9 mi
• Tide times at Tigalda Bay, Tigalda Island 16 mi
• Tide times at SE Tigalda Island, Pacific Ocean 16 mi
• 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 UNI1002, bin 29: original at NOAA. Marine alerts from the National Weather Service.