Pier 23 tidal current predictions

Now

Flood 0.4 ktToward SE (143°)

Next slack

11:27 PMPDT

Next max flood

1.4 ktSat 8:31 AM

Next max ebb

2.1 ktSat 2:50 AM

Knots along the channel: above the line the flood, running in toward SE (143°); below it the ebb, running out toward NW (323°). Times are Pacific Daylight Time. Today: ebb 2.1 kt 2:12 AM, slack 6:02 AM, flood 1.2 kt 7:59 AM, slack 10:31 AM, ebb 2.1 kt 2:21 PM, slack 6:13 PM, flood 1.6 kt 8:28 PM, slack 11:27 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 Point, Pier 35, north ofHarmonic current station0.8 mi
• Yerba Buena Island, west of (midchannel)Harmonic current station0.8 mi
• Treasure Island, 0.8 mile west ofSubordinate current station1.2 mi
• Bay Bridge, Pier DHarmonic current station1.3 mi
• Bay Bridge, Span B-CHarmonic current station1.4 mi
• Treasure Island, 0.2 mile west ofSubordinate current station1.5 mi
• Alcatraz Island, south ofSubordinate current station1.6 mi
• Rincon PointHarmonic current station1.7 mi

• Tide times at San Francisco, North Point, Pier 41 0.9 mi
• Tide times at Rincon Point, Pier 22 1/2 1.2 mi
• Tide times at Alcatraz Island 1.8 mi
• Forecast for Chinatown, CA
• Open the live map with tidal currents
• All tidal current stations in California

Tidal current predictions from NOAA’s Center for Operational Oceanographic Products and Services (CO-OPS), station SFB1206, bin 11: original at NOAA. Marine alerts from the National Weather Service.