Barnstable Harbor tidal current predictions

Next slack

Sat 5:42 AMEDT

Next max flood

1.1 ktSat 9:03 AM

Next max ebb

1.3 ktSat 2:47 AM

Knots along the channel: above the line the flood, running in toward SSW (192°); below it the ebb, running out toward N (4°). Times are Eastern Daylight Time. Today: ebb 1.3 kt 2:09 AM, slack 5:01 AM, flood 1.1 kt 8:44 AM, slack 11:05 AM, ebb 1.3 kt 2:34 PM, slack 5:23 PM, flood 1.0 kt 8:40 PM, slack 11:11 PM.

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

  * WHAT...Northeast winds 20 to 30 kt with gusts up to 50 kt and seas 6 to 9 feet. * WHERE...Cape Cod 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.

• Lewis Bay entrance channelSubordinate current station6.6 mi
• Point Gammon, 1.2 miles south ofSubordinate current station9.6 mi
• Dennis Port, 2.2 miles south ofSubordinate current station11 mi
• Cotuit Bay entrance (Bluff Point)Subordinate current station11 mi
• Cape Cod Canal, east endHarmonic current station12 mi
• Broken Ground-Horseshoe Shoal, betweenSubordinate current station12 mi
• Monomoy Point, 6 miles west ofSubordinate current station13 mi
• Sagamore BridgeHarmonic current station14 mi

• Tide times at Barnstable Harbor, Beach Point 0.7 mi
• Tide times at South Yarmouth, Bass River 6.3 mi
• Tide times at Sesuit Harbor, East Dennis 6.3 mi
• Forecast for Yarmouth Port, 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 ACT1546, bin 1: original at NOAA. Marine alerts from the National Weather Service.