Umak Pass, off Narrows Point tidal current predictions

Now

SlackTurning

Next slack

12:08 PMHADT

Next max flood

3.5 kt2:44 PM

Next max ebb

2.8 kt8:48 AM

Knots along the channel: above the line the flood, running in toward NW (305°); below it the ebb, running out toward SE (130°). Times are Hawaii-Aleutian Daylight Time. Today: flood 3.6 kt 2:37 AM, slack 6:20 AM, ebb 2.8 kt 8:48 AM, slack 12:08 PM, flood 3.5 kt 2:44 PM, slack 6:08 PM, ebb 2.9 kt 8:37 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. 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.

• Chugul Pass, 0.5 mile NE of Cape RuinSubordinate current station6.3 mi
• Little Tanaga Strait, off Tana PtSubordinate current station7.5 mi
• Chugul Pass, 2 miles NE of Cape RuinSubordinate current station8.1 mi
• Chugul Pass, 0.8 mile SW of Tanager PtSubordinate current station9.7 mi
• Igitkin Pass, 0.8 mile N of Tanager PtSubordinate current station11 mi
• Kagalaska Strait, off Galas PointSubordinate current station15 mi
• Fenimore Rock, 1.2 miles southwest ofSubordinate current station23 mi

• Tide times at Sand Bay, Great Sitkin Island 8.6 mi
• Tide times at Bugle Point, Great Sitkin Island 14 mi
• Tide times at Laska Cove, Kagalaska Island 14 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 PCT5636, bin 1: original at NOAA. Marine alerts from the National Weather Service.