Umnak Pass, south approach tidal current predictions

Now

Flood 1.2 ktToward NNW (341°)

Next slack

11:39 AMAKDT

Next max flood

2.0 kt6:58 PM

Next max ebb

1.4 kt2:16 PM

Knots along the channel: above the line the flood, running in toward NNW (341°); below it the ebb, running out toward S (181°). Times are Alaska Daylight Time. Today: ebb 5.5 kt 12:50 AM, slack 4:18 AM, flood 2.6 kt 7:07 AM, slack 11:39 AM, ebb 1.4 kt 2:16 PM, slack 3:54 PM, flood 2.0 kt 6:58 PM, slack 9:49 PM.

• Gale Warning Gale Warning issued October 1 at 3:43AM AKDT until October 1 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...E wind 35 kt. Seas 13 ft. Rain. .TONIGHT...NE wind 30 kt. Seas 13 ft. Rain. .FRI...NE wind 30 kt becoming N 20 kt in the afternoon. Seas 11 ft. .FRI NIGHT...NE wind 15 kt. Seas 7 ft. .SAT...SW wind 30 kt. Seas 10 ft. .SUN...SW wind 35 kt. Seas 14 ft. .MON...NW wind 30 kt. Seas 12 ft.

• Gale Warning Gale Warning issued September 30 at 3:09PM AKDT until October 2 at 5:00AM AKDT by NWS Anchorage AKUntil Fri 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...SE wind 25 kt. Seas 4 ft building to 8 ft after midnight. Rain. .THU...NE wind 35 kt. Seas 12 ft. Rain. .THU NIGHT...NE wind 35 kt. Seas 12 ft. Rain. .FRI...N wind 30 kt. Seas 11 ft. .FRI NIGHT...N wind 20 kt. Seas 8 ft. .SAT...SW wind 30 kt. Seas 9 ft. .SUN...W wind 35 kt. Seas 12 ft. .MON...W wind 30 kt. Seas 12 ft.

• Gale Warning Gale Warning issued September 30 at 3:43AM AKDT until October 1 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 15 kt. Seas 3 ft. Rain. .TONIGHT...SE wind 25 kt. Seas 4 ft building to 8 ft after midnight. Rain. .THU...NE wind 35 kt. Seas 12 ft. Rain. .THU NIGHT...NE wind 35 kt. Seas 14 ft. .FRI...N wind 30 kt. Seas 13 ft. .SAT...SW wind 30 kt. Seas 9 ft. .SUN...W wind 35 kt. Seas 12 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.

• Konets HeadHarmonic current station5.3 mi
• Umnak PassHarmonic current station8.7 mi
• Umnak Pass, northwest of Ship RockSubordinate current station9.6 mi
• Paso PointHarmonic current station14 mi

• Tide times at Otter Point 11 mi
• Tide times at Inanudak Bay 18 mi
• Tide times at Chernofski Harbor 19 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 PCT5546, bin 1: original at NOAA. Marine alerts from the National Weather Service.