Popof Strait tidal current predictions

Now

SlackTurning

Next slack

8:33 PMAKDT

Next max flood

0.2 kt10:57 PM

Next max ebb

0.4 kt5:07 PM

Knots along the channel: above the line the flood, running in toward N (357°); below it the ebb, running out toward SSW (199°). Times are Alaska Daylight Time. Today: slack 1:56 AM, ebb 0.5 kt 4:39 AM, slack 8:10 AM, flood 0.2 kt 10:38 AM, slack 2:32 PM, ebb 0.4 kt 5:07 PM, slack 8:33 PM, flood 0.2 kt 10:57 PM.

• Small Craft Advisory Small Craft Advisory issued September 26 at 2:49PM AKDT until September 28 at 5:00AM AKDT by NWS Anchorage AKUntil Mon 5:00 AM
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  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 30 kt. Seas 10 ft. .SUN...W wind 30 kt. Seas 7 ft. .SUN NIGHT...W wind 25 kt. Seas 5 ft. .MON AND MON NIGHT...NW wind 25 kt. Seas 4 ft. .TUE...W wind 20 kt. Seas 3 ft. .WED...SW wind 15 kt. Seas 2 ft. .THU...SE wind 20 kt. Seas 6 ft.

• Gale Warning Gale Warning issued September 26 at 5:16AM AKDT until September 26 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...SW wind 35 kt. Seas 10 ft. Rain showers. .TONIGHT...SW wind 30 kt. Seas 10 ft. .SUN...W wind 30 kt. Seas 7 ft. .SUN NIGHT...W wind 25 kt. Seas 5 ft. .MON...NW wind 25 kt. Seas 4 ft. .TUE...W wind 20 kt. Seas 3 ft. .WED...SW wind 15 kt. Seas 2 ft.

• Gale Warning Gale Warning issued September 25 at 3:30PM AKDT until September 26 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...SW wind 30 kt. Seas 8 ft. Rain showers. .SAT...SW wind 35 kt. Seas 10 ft. Rain showers. .SAT NIGHT...SW wind 30 kt. Seas 10 ft. .SUN AND SUN NIGHT...W wind 25 kt. Seas 6 ft. .MON...NW wind 25 kt. Seas 4 ft. .TUE THROUGH WED...NW wind 15 kt. Seas 3 ft.

• Gale Warning Gale Warning issued September 25 at 5:09AM AKDT until September 26 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...SW wind 25 kt. Seas 8 ft. Rain showers. .TONIGHT...SW wind 30 kt. Seas 9 ft. Rain showers. .SAT...SW wind 35 kt. Seas 11 ft. Rain showers. .SAT NIGHT...SW wind 30 kt. Seas 10 ft. .SUN THROUGH MON...NW wind 30 kt. Seas 6 ft. .TUE...W wind 15 kt. Seas 4 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. This is a subordinate station: NOAA predicts it from a nearby harmonic station by fixed corrections to the times and speeds of its slack waters and maxima, so the curve between them is less exact.

• Unga Strait (1.4 miles N of Unga Spit)Subordinate current station11 mi

• Tide times at Sand Point 0.5 mi
• Tide times at Zachary Bay, Unga Island 3.9 mi
• Tide times at Pirate Cove, Popof Island 6.5 mi
• Forecast for Sand Point, 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 PCT5406, bin 1: original at NOAA. Marine alerts from the National Weather Service.