Grass Hassock Channel tidal current predictions

Now

Ebb 0.6 ktToward SW (228°)

Next slack

4:08 PMEDT

Next max flood

1.0 kt6:48 PM

Next max ebb

1.3 ktSun 12:18 AM

Knots along the channel: above the line the flood, running in toward NE (52°); below it the ebb, running out toward SW (228°). Times are Eastern Daylight Time. Today: slack 3:40 AM, flood 1.1 kt 6:24 AM, slack 9:08 AM, ebb 1.2 kt 11:56 AM, slack 4:08 PM, flood 1.0 kt 6:48 PM, slack 9:25 PM.

• Storm Warning Storm Warning issued September 26 at 4:30AM EDT until September 27 at 6:00AM EDT by NWS Upton NYUntil Sun 6:00 AM
  Full text

  * WHAT...North winds 30 to 40 kt with gusts up to 50 kt and seas 11 to 16 ft. * WHERE...Sandy Hook NJ to Fire Island Inlet NY out 20 nm. * WHEN...Until 6 AM EDT Sunday. * 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.

• East Rockaway InletSubordinate current station2.1 mi
• Beach Channel (bridge)Subordinate current station2.5 mi
• Canarsie (midchannel), Jamaica BayHarmonic current station5.2 mi
• Marine Parkway Bridge, Rockaway InletHarmonic current station5.8 mi
• Long Beach, inside, between bridgesSubordinate current station6.6 mi
• Rockaway Inlet EntranceHarmonic current station8.6 mi
• Rockaway PointSubordinate current station9.7 mi
• Rockaway Inlet Jetty, 1 nm SW ofHarmonic current station11 mi

• Tide times at J.F.K. International Airport 0.9 mi
• Tide times at Motts Basin 1.5 mi
• Tide times at Beach Channel (bridge) 2.4 mi
• Forecast for Edgemere, NY
• Open the live map with tidal currents
• All tidal current stations in New York

Tidal current predictions from NOAA’s Center for Operational Oceanographic Products and Services (CO-OPS), station ACT3601, bin 1: original at NOAA. Marine alerts from the National Weather Service.