Sandwich Marina
Not today, captain. The water is outside your comfort line.
Patchy Smoke · 83° · 13 kt windNo 4-hour stretch stays inside the Pursuit 235 limits of 15 kt wind and 2.5 ft seas.
For Pursuit 235 · 4 hours · limits 15 kt / 2.5 ftMake it yours, skipper
The flag re-reads the water for your boat and your day.
Your boat
Time on the water
Your comfort line: 15 kt wind · 2.5 ft seas
Pick your day
Seven days, one honest flag each.
Showing hourly detail for today. Each flag uses that day's own forecast.
Daylight forecast
6 NWS grid hours
Prediction unavailable
No recent report
How the day develops
Wind, waves, and tide stay aligned to the same daylight hours.
Sustained wind in knots. The dashed line is your selected boat limit.
Wave height from the NWS marine grid, with clearly identified buoy-based estimates for gaps.
Predicted water level in feet relative to MLLW from NOAA CO-OPS.
Hour by hour
Daylight only. The useful part of your day.
View exact hourly readings
How this forecast is built
3 of 5 inputs reporting. Stations, locations, and roles are shown below.
Resolved directly from the destination coordinates.
The buoy fills wave gaps and supplies observations.
Predicted heights and high/low timing.
Shown when the selected buoy reports it.
Source geography
Where these readings come from
Dashed lines connect this destination to the stations contributing marine, tide, and aviation context.
- Forecast pointSandwich MarinaNWS forecast point
- BuoyCape Cod Bay · 4401830.3 NM away
- Tide gaugeSandwich Marina · 84471800.1 NM away
- AviationBarnstable Muni · KHYA11.8 NM away
NWS hourly forecast
RoleSupplies the hourly wind, sky, temperature, and precipitation forecast at this destination.
- forecast point
- Sandwich Marina · sandwich-marina
- Coordinates
- 41.7710° N, 70.5060° W
Why this sourceResolved from the destination coordinates, so it represents the selected harbor rather than a nearby city.
Data timingForecast grid updated · 27 min ago
ConfidenceThe forecast is resolved directly at this location.
Hourly wind, weather, temperature, and precipitation forecast resolved from the selected latitude/longitude.
NWS coastal marine grid
RoleSupplies forecast wave heights, which Boat or Nope uses before buoy-based estimates when available.
- marine grid point
- Cape Cod Bay · 44018
- Distance
- 30.3 NM from destination
- Coordinates
- 42.2030° N, 70.1540° W
Why this sourceResolved on the coastal marine grid at NDBC 44018, the selected marine reference point for this destination.
Data timingMarine grid updated · 27 min ago
ConfidenceThe source is 30.3 NM away, so local conditions may differ.
Wave-height forecast resolved at NDBC 44018. Used before Boat or Nope's observed-buoy fallback when the grid reports usable wave heights.
NDBC 44018
RoleChecks recent observed wind, waves, and water temperature and helps fill gaps when the marine grid has no usable wave value.
- buoy
- Cape Cod Bay · 44018
- Distance
- 30.3 NM from destination
- Coordinates
- 42.2030° N, 70.1540° W
Why this sourceSelected from the catalog as the nearest trusted NDBC marine observation station for Sandwich Marina.
Data timingNo recent observation
ConfidenceThis source did not return usable data during the latest refresh.
Nearest catalog buoy, 30.3 NM from the selected location. Reports observed wind, waves, and water temperature when those sensors are available.
NDBC: 404 Not Found
CO-OPS 8447180
RoleSupplies predicted tide heights and high/low timing for each forecast day.
- tide station
- Sandwich Marina · 8447180
- Distance
- 0.1 NM from destination
- Coordinates
- 41.7717° N, 70.5067° W
Why this sourceSelected as the nearest trusted CO-OPS prediction station for Sandwich Marina.
Data timingPredictions generated for each selected day
ConfidenceThis source did not return usable data during the latest refresh.
Nearest catalog tide station, 0.1 NM from the selected location. Tide predictions and high/low events in feet relative to MLLW for the available forecast days.
CO-OPS today: 403 Forbidden
AviationWeather KHYA
RoleAdds nearby observed and forecast gust context from METAR and TAF reports.
- aviation station
- Barnstable Muni · KHYA
- Distance
- 11.8 NM from destination
- Coordinates
- 41.6693° N, 70.2804° W
Why this sourceChosen from the nearest aviation candidates that returned a current METAR or TAF report.
Data timingLatest METAR observation · 33 min ago
ConfidenceThe selected source is within 25 NM of the destination.
Nearest aviation candidates: KHYA 11.8 NM, KEWB 21 NM, KPVC 22.1 NM.
Hourly seas: NWS coastal marine-grid wave height is preferred when available. Gaps fall back to the latest NDBC wave observation projected with forecast wind; fallback values are planning estimates, not NOAA wave forecasts.
Verdict: Go, Caution, No-Go, or Incomplete is derived from the boat limits you select for wind and seas.
Updated 7/16/2026, 3:28:54 PM EDT · Planning context, not certified navigation.
Nearby harbors