Memorial Bridge tidal current predictions

Now

Flood 1.8 ktToward W (277°)

Next slack

1:27 PMEDT

Next max flood

2.7 kt9:52 AM

Next max ebb

3.4 kt4:00 PM

Knots along the channel: above the line the flood, running in toward W (277°); below it the ebb, running out toward ESE (105°). Times are Eastern Daylight Time. Today: slack 1:03 AM, ebb 3.3 kt 3:34 AM, slack 7:20 AM, flood 2.7 kt 9:52 AM, slack 1:27 PM, ebb 3.4 kt 4:00 PM, slack 7:42 PM, flood 2.8 kt 10:14 PM.

• Coastal Flood Advisory Coastal Flood Advisory issued September 26 at 2:22AM EDT until September 27 at 11:00PM EDT by NWS Gray MEUntil Sun 11:00 PM
  Full text

  * WHAT...For the High Surf Advisory, large breaking waves of 7 to 12 feet and a high risk of rip currents. For the Coastal Flood Advisory, minor coastal flooding with up to 1 foot of inundation and large breaking waves leading to splash over and beach erosion. This is a long duration event...with these impacts felt over multiple tide cycles beginning this morning and continuing through Sunday evening. * WHERE...In Maine, Coastal York County. In New Hampshire, Coastal Rockingham County. * WHEN...For the High Surf Advisory, until 8 PM EDT Sunday. For the Coastal Flood Advisory, from 10 AM this morning to 11 PM EDT Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Dangerous swimming and surfing conditions and localized beach erosion.

  If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Inexperienced swimmers should remain out of the water due to dangerous surf 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.

• Portsmouth Harbor, Gangway Rocks LB13Current meter (NOAA PORTS)0.3 mi
• Pierces Island, northeast ofSubordinate current station0.6 mi
• Henderson Point, west ofHarmonic current station0.8 mi
• Henderson Point, SSW ofSubordinate current station0.8 mi
• Sara Long BridgeHarmonic current station0.8 mi
• Shapleigh Island Bridge, south ofSubordinate current station1.0 mi
• I-95 BridgeHarmonic current station1.2 mi
• Clark Island, southwest ofSubordinate current station1.3 mi

• Tide times at Portsmouth 0.1 mi
• Tide times at Seavey Island 0.6 mi
• Tide times at Atlantic Heights 0.9 mi
• Forecast for Portsmouth, NH
• Open the live map with tidal currents
• All tidal current stations in New Hampshire

Tidal current predictions from NOAA’s Center for Operational Oceanographic Products and Services (CO-OPS), station PIR0705, bin 16: original at NOAA. Marine alerts from the National Weather Service.