Atlantis Canyon Marine Forecast
Updated Sun Sep 20, 2026
Sunday's the pick; Saturday and Monday bring rough, unsafe seas
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Marine Forecast for Atlantis Canyon Sep 19–21, 2026
📋 Sunday's the pick; Saturday and Monday bring rough, unsafe seas
Unsafe for a full trip: NE winds 11-20 knots with gusts to 29 knots combine with steep, short-period 2.9-5.2 feet ENE wind-wave chop lasting about 10 hours. No settled all-GO stretch exists long enough for a 12h trip, so this day is a no-go.
The best day this week. Winds stay light at 8-12 knots SSE all day, and a settled GO stretch runs 6:00 AM to midnight. Early hours see a brief confused cross-sea as NNE swell crosses E wind-wave for about 3 hours, but conditions smooth out into a comfortable 3.7 feet, 5-second ESE sea.
Dangerous conditions develop as NNE winds swing wildly 4-25 knots with gusts to 34 knots, plus rain. Steep wind-wave chop persists 9 hours and a confused cross-sea forms as SE swell crosses NNE wind-wave for 5 hours, pushing seas to 7.5 feet. No safe 12h window exists—stay off the water.
Sunday 6:00 AM to 5:00 PM offers the most settled stretch, with light 10-11 knots SSE winds and manageable 3.7 feet seas at 5-second periods from the ESE.
Recent days at Atlantis Canyon
Today’s Water at Atlantis Canyon
Sea surface temperature and chlorophyll around Atlantis Canyon, imaged fresh every morning. Water at the star is 79.5°F today, and chlorophyll of 0.31 mg/m³ reads as green shelf water at the spot.
Imagery: Sep 19, 2026 · rebuilt every morning
These charts show you the breaks. DeepCast reads them. A zone-by-zone AI fishing report for these exact waters — temperature edges, color changes, and structure, analyzed together — for $4.99.
Get the AI fishing reportSST and chlorophyll from the SeaLegs AI DeepCast satellite pipeline. Charts are a planning aid — always check the official marine forecast before making the run.
About Atlantis Canyon
Atlantis Canyon cuts the shelf edge roughly 100 nautical miles south of Martha's Vineyard, between Block Canyon to the west and Veatch to the east. It is one of the longer runs in the Southern New England fleet — out of Montauk, Point Judith or Block Island — and a reliable one for bigeye and yellowfin tuna, white and blue marlin, mahi and swordfish when the warm water pushes up onto the edge.
At that distance there is no ducking back in when the wind comes up, so the forecast below is built around the two things that decide a canyon trip: wind against current and swell period. Each day gets an honest GO, CAUTION, or NO-GO call — the same AI rating used in the SeaLegs AI app.
Reading conditions at Atlantis Canyon
The canyon sits where the bottom falls away at the shelf break, and offshore swell arrives there with nothing to soften it. Short-period seas that feel manageable inside the Race or off Point Judith stack up steep and close over the edge, and a southwest blow against the current makes it worse. When you read the days below, weight the wave period as heavily as the height: 5 feet at 12 seconds can be a comfortable ride out, while 4 feet at 5 seconds is a punishing one.
Plan the whole window, not just the departure. A hundred-mile run each way makes this a 20-hour day at minimum, and commonly an overnight for the tuna bite — so a forecast that opens calm and builds through the afternoon can close the door on the ride home. The three-day view above is exactly for that call: pick the day the window stays open on both ends, and always confirm the official NWS offshore waters forecast and marine warnings before you leave the dock.
Atlantis Canyon forecast FAQ
How is the sea at Atlantis Canyon today?
As of Sep 19, 2026, the SeaLegs AI verdict for Atlantis Canyon is NO-GO. Unsafe for a full trip: NE winds 11-20 knots with gusts to 29 knots combine with steep, short-period 2.9-5.2 feet ENE wind-wave chop lasting about 10 hours. No settled all-GO stretch exists long enough for a 12h trip, so this day is a no-go.
How far offshore is Atlantis Canyon?
Atlantis Canyon lies roughly 100 nautical miles south of Martha's Vineyard, at the edge of the continental shelf. From Montauk, Point Judith or Block Island that is commonly a 100-to-110-mile run each way, with no shelter once you are past the shelf break.
What fish does Atlantis Canyon hold?
The shelf-break canyon concentrates bigeye and yellowfin tuna, white and blue marlin, mahi and swordfish along the warm temperature edge, with the bigeye bite the one most Southern New England crews run for.
How often is this Atlantis Canyon forecast updated?
The forecast on this page is rebuilt every morning from the latest marine model data, and the SpotCast card refreshes live in your browser. The date stamp above the outlook shows exactly when it was last generated.
What do GO, CAUTION, and NO-GO mean?
GO means conditions are favorable for most recreational offshore boats. CAUTION means marginal — manageable for experienced crews in capable vessels, but check the wind, swell period, and timing closely. NO-GO means conditions are hazardous for small craft and the trip is best postponed.
Can I get a forecast like this for my own spot?
Yes. In the free SeaLegs AI app you can drop a pin on any spot on Earth — Atlantis, Veatch, Block, or your own canyon numbers — and get the same AI-rated marine forecast, plus fishing reports and trip planning.
What is the water temperature at Atlantis Canyon today?
As of Sep 19, 2026, the satellite-derived sea surface temperature at Atlantis Canyon is about 79.5°F, with chlorophyll around 0.31 mg/m³ (green shelf water). The SST and chlorophyll charts on this page are rebuilt every morning from the SeaLegs AI DeepCast satellite pipeline.
More offshore forecasts
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