Snow Passage Narrows tidal current predictions

Now

Ebb 3.1 ktToward NNW (331°)

Next slack

6:06 AMAKDT

Next max flood

3.2 kt8:54 AM

Next max ebb

3.4 kt2:44 PM

Knots along the channel: above the line the flood, running in toward SSE (153°); below it the ebb, running out toward NNW (331°). Times are Alaska Daylight Time. Today: ebb 3.4 kt 2:33 AM, slack 6:06 AM, flood 3.2 kt 8:54 AM, slack 11:49 AM, ebb 3.4 kt 2:44 PM, slack 6:24 PM, flood 3.4 kt 9:23 PM.

• Small Craft Advisory Small Craft Advisory issued September 26 at 2:59AM AKDT until September 26 at 6:00PM AKDT by NWS Juneau AKUntil 6:00 PM
  Full text

  * WHAT...Southeast winds 20 to 30 kt with gusts up to 35 kt and seas 6 to 8 ft expected. * WHERE...Clarence Strait. * WHEN...From 10 AM this morning to 6 PM AKDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

  Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.

• Small Craft Advisory Small Craft Advisory issued September 25 at 3:33PM AKDT until September 26 at 5:00PM AKDT by NWS Juneau AKUntil 5:00 PM
  Full text

  Southeast Alaska Inside Waters from Dixon Entrance to Skagway Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent the average of the highest one-third of the combined windwave and swell height. .TONIGHT...NW wind 10 kt becoming SE late. Seas 2 ft or less. .SAT...SE wind 25 kt. Seas 5 ft building to 8 ft in the afternoon. Rain. .SAT NIGHT...SE wind 25 kt. Seas 6 ft. Rain. .SUN...SE wind 30 kt. Seas 9 ft. Rain. .SUN NIGHT...SE gale to 35 kt. Seas 12 ft. Rain. .MON...SE wind 30 kt. Seas 11 ft. .TUE...S wind 20 kt. Seas 6 ft. .WED...S wind 25 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.

• Snow Passage, southern approachHarmonic current station1.6 mi
• Snow Passage, north entranceSubordinate current station3.4 mi
• Shrubby Island, east ofHarmonic current station4.0 mi
• Kashevarof Passage, north entranceSubordinate current station4.2 mi
• Round Island LightHarmonic current station5.9 mi
• Key ReefSubordinate current station9.0 mi
• Steamer Point, 1 mile west ofSubordinate current station9.5 mi
• Vichnefski Rock LightHarmonic current station12 mi

• Tide times at Bushy Island, Snow Passage 1.2 mi
• Tide times at Blashke Island 11 mi
• Tide times at Point Harrington 12 mi
• Forecast for Wrangell, 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 SEA0403, bin 29: original at NOAA. Marine alerts from the National Weather Service.