Deer Island Flats tidal current predictions

Now

Ebb 0.4 ktToward ESE (107°)

Next slack

4:56 AMEDT

Next max flood

0.5 kt6:54 AM

Next max ebb

0.5 kt11:49 AM

Knots along the channel: above the line the flood, running in toward NNW (327°); below it the ebb, running out toward ESE (107°). Times are Eastern Daylight Time. Today: slack 4:56 AM, flood 0.5 kt 6:54 AM, slack 9:49 AM, ebb 0.5 kt 11:49 AM, slack 5:20 PM, flood 0.5 kt 7:08 PM, slack 9:58 PM, ebb 0.5 kt 11:59 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 20 to 25 kt with gusts up to 50 kt and waves around 3 feet. * WHERE...In Massachusetts coastal waters, Boston Harbor. In Rhode Island coastal waters, Narragansett Bay. * WHEN...Until 8 PM EDT Saturday. * IMPACTS...Storm force winds and hazardous waves 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.

• Long Island Head, 0.9 nmi NW ofSubordinate current station0.5 mi
• Deer Island, southwest ofSubordinate current station0.8 mi
• Spectacle Island, 0.4nm north ofHarmonic current station1.0 mi
• Deer Island Light, 1.0 nmi WSW ofSubordinate current station1.0 mi
• Snake Island, southwest ofSubordinate current station1.2 mi
• Boston Harbor (Deer Island Light)Harmonic current station1.3 mi
• Deer Island Light, 0.3 nmi SSE ofSubordinate current station1.3 mi
• Boston Channel Light No.5Harmonic current station1.4 mi

• Tide times at Deer Island (south end) 0.9 mi
• Tide times at Moon Head 2.8 mi
• Tide times at Chelsea St. Bridge, Chelsea River 3.6 mi
• Forecast for Winthrop, 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 ACT1141, bin 1: original at NOAA. Marine alerts from the National Weather Service.