South end tidal current predictions

Now

Ebb 2.2 ktToward WNW (300°)

Next slack

5:47 AMEDT

Next max flood

2.0 kt7:23 AM

Next max ebb

2.2 kt1:14 PM

Knots along the channel: above the line the flood, running in toward SE (140°); below it the ebb, running out toward WNW (300°). Times are Eastern Daylight Time. Today: ebb 2.3 kt 12:47 AM, slack 5:47 AM, flood 2.0 kt 7:23 AM, slack 11:15 AM, ebb 2.2 kt 1:14 PM, slack 6:08 PM, flood 2.2 kt 7:43 PM, slack 11:28 PM.

• Storm Warning Storm Warning issued September 25 at 2:58PM EDT until September 26 at 8:00PM EDT by NWS Boston/Norton MAUntil 8:00 PM
  Full text

  * WHAT...Northeast winds 25 to 35 kt with gusts up to 55 kt and seas 6 to 9 feet. * WHERE...Nantucket Sound, Vineyard Sound and Buzzards Bay. * WHEN...Until 8 PM EDT Saturday. * IMPACTS...Storm force winds and hazardous seas will capsize or damage vessels and reduce visibility.

  Mariners should remain in port, alter course, and/or secure the vessel for severe conditions.

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.

• MiddleHarmonic current station0.5 mi
• North endSubordinate current station1.0 mi
• Robinsons Hole, Nashuon PointHarmonic current station2.0 mi
• Gay Head, 3 miles north ofSubordinate current station2.6 mi
• Gull I. and Nashawena I., betweenSubordinate current station3.2 mi
• Robinsons Hole, 1.2 miles southeast ofSubordinate current station3.2 mi
• Canapitsit ChannelHarmonic current station3.6 mi
• Penikese Island, 0.2 mile south ofSubordinate current station4.3 mi

• Tide times at Quicks Hole, North side 1.0 mi
• Tide times at Cuttyhunk 4.0 mi
• Tide times at Penikese Island 4.2 mi
• Forecast for Chilmark, MA
• Open the live map with tidal currents
• All tidal current stations in Massachusetts

Tidal current predictions from NOAA’s Center for Operational Oceanographic Products and Services (CO-OPS), station ACT1901, bin 1: original at NOAA. Marine alerts from the National Weather Service.