Gallops Island, The Narrows tidal current predictions

Now

SlackTurning

Next slack

5:05 PMEDT

Next max flood

0.6 kt8:53 PM

Next max ebb

0.1 ktMon 3:02 AM

Knots along the channel: above the line the flood, running in toward SE (135°); below it the ebb, running out toward W (262°). Times are Eastern Daylight Time. Today: slack 12:43 AM, ebb 0.1 kt 2:17 AM, slack 4:38 AM, flood 0.6 kt 8:29 AM, slack 1:10 PM, ebb 0.1 kt 2:55 PM, slack 5:05 PM, flood 0.6 kt 8:53 PM.

• Gale Warning Gale Warning issued September 27 at 3:09PM EDT until September 27 at 9:00PM EDT by NWS Boston/Norton MAUntil 9:00 PM
  Full text

  * WHAT...Northeast winds 20 to 25 kt with gusts up to 30 kt and waves 2 to 4 feet. * WHERE...Boston Harbor. * WHEN...Until 9 PM EDT this evening. * IMPACTS...Strong winds will cause hazardous waves which could capsize or damage vessels and reduce visibility.

  Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous 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.

• Lovell Island NarrowsHarmonic current station0.1 mi
• Lovell Island, west ofSubordinate current station0.1 mi
• Gallops Island, 0.1 nmi southeast ofSubordinate current station0.2 mi
• Gallops Island, 0.2 nmi SSE ofSubordinate current station0.3 mi
• Georges Island, north ofSubordinate current station0.4 mi
• Nixes MateHarmonic current station0.5 mi
• Georges Island, northeast ofSubordinate current station0.5 mi
• Lovell Island, 0.1 nmi south ofSubordinate current station0.5 mi

• Tide times at Hull 1.8 mi
• Tide times at Deer Island (south end) 2.0 mi
• Tide times at Boston Light 2.2 mi
• Forecast for Hull, 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 ACT1296, bin 1: original at NOAA. Marine alerts from the National Weather Service.