South Passage tidal current predictions

Now

Ebb 1.9 ktToward W (274°)

Next slack

8:05 PMAKDT

Next max flood

1.6 kt10:28 PM

Next max ebb

2.4 ktSat 4:48 AM

Knots along the channel: above the line the flood, running in toward E (92°); below it the ebb, running out toward W (274°). Times are Alaska Daylight Time. Today: slack 12:27 AM, ebb 2.3 kt 4:18 AM, slack 7:37 AM, flood 1.7 kt 10:08 AM, slack 12:57 PM, ebb 2.6 kt 4:42 PM, slack 8:05 PM, flood 1.6 kt 10:28 PM.

None right now. The National Weather Service issues small craft advisories, gale and storm warnings, special marine warnings, dense fog advisories and coastal flood products for water like this.

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.

• North PassageHarmonic current station5.8 mi
• South Inian Pass, east endHarmonic current station7.7 mi
• South Inian Pass, west endHarmonic current station9.3 mi
• Port Althrop entr, east of George IslandHarmonic current station9.9 mi
• North Inian Pass, east endHarmonic current station10 mi
• Glacier Bay entrance, off Point CarolusHarmonic current station11 mi
• North Inian Pass, middleSubordinate current station11 mi
• North Inian Pass, west endHarmonic current station11 mi

• Tide times at Mud Bay, Goose Island 2.9 mi
• Tide times at Inian Cove, North Inian Pass 8.4 mi
• Tide times at Elfin Cove 9.5 mi
• Forecast for Hoonah, 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 SEA0843, bin 31: original at NOAA. Marine alerts from the National Weather Service.