East Dennis, MA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for East Dennis, MA

May 6, 2024 11:38 AM EDT (15:38 UTC) Change Location
Sunrise 5:28 AM   Sunset 7:46 PM
Moonrise 4:30 AM   Moonset 6:17 PM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

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Marine Forecasts
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ANZ231 Cape Cod Bay- 1003 Am Edt Mon May 6 2024

This afternoon - SW winds 5 to 10 kt. Seas around 2 ft. Wave detail: E 2 ft at 9 seconds and S 1 ft at 2 seconds.

Tonight - SW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft. Wave detail: E 2 ft at 10 seconds and sw 1 ft at 2 seconds.

Tue - N winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave detail: E 2 ft at 10 seconds and W 1 ft at 2 seconds.

Tue night - S winds 5 to 10 kt. Seas 1 foot or less. Wave detail: S 1 ft at 2 seconds and E 1 ft at 9 seconds.

Wed - S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave detail: S 1 ft at 2 seconds and E 1 ft at 6 seconds, becoming S 1 ft at 2 seconds and E 1 ft at 7 seconds. A chance of rain.

Wed night - SW winds 5 to 10 kt, becoming nw after midnight. Seas around 2 ft. Wave detail: S 1 ft at 2 seconds and E 1 ft at 8 seconds. A chance of rain in the evening.

Thu - NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of rain.

Thu night through Fri night - NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of rain.
seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ200 1003 Am Edt Mon May 6 2024

Synopsis for massachusetts and rhode island coastal waters - A weak cold front moves across new england Monday, then offshore Monday night. Weak high pressure then builds over the region Tuesday. Weak broad area of low pressure then moves across new england Wednesday. Another low, potentially stronger, tracks over or just south of the ma/ri waters later Thu into Fri. This low exits into the maritimes Saturday, followed by weak high pressure over new england Sunday.



7 Day Forecast for Marine Location Near East Dennis, MA
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Area Discussion for - Boston, MA
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FXUS61 KBOX 061403 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1003 AM EDT Mon May 6 2024

SYNOPSIS
Partial sunshine develops today with much warmer temperatures.
A brief band of scattered showers is expected Monday afternoon/ evening...but the majority of the time will feature dry weather.
Tuesday will be the pick of the week with abundant sunshine and above normal temperatures. Then an unsettled weather pattern develops Wednesday and beyond, with cooler than normal temperatures and the risk of showers at times. However, there will also be periods of dry weather. The weekend may feature a drying trend, with shower potential not as widespread and limited to the afternoon/evening hours.

NEAR TERM /UNTIL 6 PM THIS EVENING/

10 AM update...

The back edge of the rain shield has finally exited the islands and we expect mostly dry weather to persist through the rest of the day. The biggest question this morning is how quickly those clouds can erode and allow the temperatures to jump up. We're currently sitting in the in the upper 50s across much of the region but where those breaks in the clouds have started we see low 60s. The next few hours should see some continued clearing and temperatures climbing. No significant changes to thinking for this afternoon.

Previous Discussion...

Today

Short-wave energy and associated showers at the surface exit east off the coast of southern New England this morning.
This will be followed by increasing temperatures and dewpoints today as southerly flow advects a more warm/moist air mass over southern New England. 925 hPa temps rise close to 15 Celsius, so we should experience very warm temperatures in the low to mid 70s across the interior this afternoon. While the sun is likely to break out at times, there will continue to be a fair amount of low clouds in place as well, especially over the south coast, Cape, and Islands where the sun may not break out at all with low-stratus persisting into tonight. With not as much sunshine and the expectation that sea-breezes will develop, these locations near the coast will be noticeably cooler than across the interior with highs in the low to mid 60s more common. While most areas should stay dry today, there will be chances for some mid-afternoon showers to develop as another embedded short- wave traverses over the region. Can't rule out a rumble of thunder either as there will be modest amounts of instability in the atmosphere to the tune of 100-300 J/kg of CAPE. Expect any shower/thunderstorm activity to be limited to the interior as sea-breezes would be expected to stabilize the atmosphere near the coast.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/
Tonight

Low clouds fill back in after sunset tonight as the boundary layer cools. Light winds and high dewpoints will likely result in areas of fog developing this evening as well. However, low-level winds in the 925-850 hPa layer shift northwest as a mid-level trough axis shifts east of the region. This will support winds shifting to the north at the surface which will allow drier air to displace the fog/low- stratus gradually overnight. Expect clearing skies by sunrise. Low temps in the low to mid 50s.

Tomorrow

Beautiful day on tap for Tuesday. High pressure and a dry air mass will support very warm and sunny conditions. 925 hPa air temps in the mid to upper teens will support another afternoon with temps in the mid to upper 70s. Can't rule out a few locations in the CT River Valley topping 80. Light northerly winds to start will become more westerly as the day progresses. By far the pick of the week if you enjoy warm/sunny weather.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/
* Progressively cooler this period, especially Fri and Sat

* Wet weather at times Wednesday through Friday, but also periods of dry weather too

* Possibly trending drier next weekend, with showers not as widespread and limited during the afternoon/early evening

Synoptic Overview...

By late Tue/Tue night, a high amplitude closed low will be located over the Dakotas. Models, including ensembles then differ on the evolution of jet energy ejecting eastward from this closed low eastward into New England. This will impact frontal position across SNE, along with timing and amplitude of frontal waves. Hence, a low confidence forecast this period. Forecast confidence increases slight for next weekend, as ensembles in better agreement, with mean trough axis over SNE, displacing deep layer moisture well offshore.
This will favor drier weather with shower threat more diurnally driven across SNE.

Precipitation...

As mentioned above, anomalous closed low over the Dakotas late Tue moves slowly east mid to late week. Models, including ensembles displaying a large spread in the timing of jet energy ejecting eastward out of this low and eventually into New England. This results in a low confidence forecast this period, specifically in regards to frontal boundary placement, including magnitude and timing of frontal waves traversing this boundary. Hence, rain likely at times, although periods of dry weather too. Unfortunately, given model spread, too difficult at this time range to nail down exact timing of specifics. Ensembles offer some support of drier weather for the weekend, with mean trough axis over SNE. This will shift deep layer moisture and frontal wave offshore. However, cyclonic flow aloft and cold pool will yield a risk of diurnal instability showers. Not widespread, but unfortunately timing will be in the afternoon and evening hours.

Temperatures...

High forecast confidence on a cooler temperature regime this period, in response to lowering heights across New England. Seasonably cool Wed with highs in the 60s, but then cooling off into the 50s Thu, especially in eastern MA behind departing wave with N-NE winds across SNE. Coolest weather could arrive Fri pending track and intensity of surface wave tracking SE of New England. Depending on amplitude of wave, could be chilly with onshore only yielding highs in the 50s. Ensemble 850 mb temp anomalies are impressive, about -6C cooler than normal. In fact, ensemble probs of 50+ highs Friday drop to less than 50% across northern MA. Hence, could see highs only in the 40s there. Chilly weather likely lingers into Saturday given below normal heights/cold pool aloft. Temps may moderate to seasonal levels by Sunday, as flow becomes NW aloft and cold pool moves offshore.

AVIATION /14Z MONDAY THROUGH FRIDAY/
Forecast Confidence Levels:

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

12Z TAF Update...high confidence in trends, but some uncertainty on exact timing.

Forecast theme remains for upward trends today with IFR/MVFR conditions lifting to VFR bases by late morning and continuing into the afternoon. Rain across RI and southeast MA at 11z will exit offshore by 12z. Then mainly a dry day, however widely scattered showers develop this afternoon and early evening.
10-20% chance of an isolated thunderstorm. Light WSW winds with local seabreezes possible along the eastern MA coast.

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Tonight...High Confidence

MVFR/IFR conditions fill back in across the interior and persist over the south coast, Cape, and Islands through about 06Z. Winds shift to the north after that time frame and allow ceilings to gradually improve to VFR by 09-12Z.

Tomorrow...High Confidence

VFR. Light northerly winds becoming light out of the west. Sea- breezes likely along the coast with very warm temps forecast over land.

KBOS TAF...Moderate Confidence in TAF. BOS should scatter out for a few hours this morning into early afternoon before returning to MVFR by early to mid afternoon. Moderate confidence in a sea- breeze circulation developing today between 14 and 16Z. Higher confidence in a sea- breeze for Tuesday.

KBDL TAF...High Confidence in TAF.

Outlook /Tuesday Night through Friday/...

Tuesday Night: VFR. Slight chance RA.

Wednesday: Mainly MVFR, with local IFR possible. Chance RA.

Wednesday Night: Mainly VFR, with local IFR possible. Chance RA.

Thursday: Mainly VFR, with areas MVFR possible. Breezy. Chance RA.

Thursday Night: Mainly MVFR, with areas IFR possible. Breezy.
Chance RA.

Friday: Mainly VFR, with areas IFR possible. Breezy. Chance RA.

MARINE
Forecaster Confidence Levels:

Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.

Today through Tomorrow...High Confidence

Modest winds and seas continue today and tomorrow. Expect areas of fog over the coastal waters this morning and this afternoon as moisture increases from southerly winds. Fog should dissipate tonight into tomorrow as a weak cold front ushers drier air over the coastal waters.

Outlook /Tuesday Night through Friday/...

Tuesday Night: Winds less than 25 kt.

Wednesday: Winds less than 25 kt. Chance of rain.

Wednesday Night: Winds less than 25 kt. Slight chance of rain.

Thursday: Winds less than 25 kt. Chance of rain.

Thursday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft. Chance of rain.

Friday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Chance of rain.

TIDES/COASTAL FLOODING

Coastal Flooding

High astro tides this week and concern becomes late Thu into Fri with potential frontal wave tracking south of New England, generating onshore flow into eastern MA. Magnitude of potential inundation and erosion will depend on strength and timing of surface low. Too early for specifics with any certainty, but given astro tides are already over 11 ft at Boston, it will only take a 1 ft storm surge and modest wave action to yield minor inundation and erosion. Stay tuned throughout the week for updated information.

BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
44090 11 mi68 min 52°F 50°F1 ft
CHTM3 12 mi68 min 55°F 52°F
44020 - NANTUCKET SOUND 19 mi48 min S 9.7G12 53°F 52°F1 ft30.0153°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 31 mi58 min 3 ft
BZBM3 - 8447930 - Woods Hole, MA 31 mi68 min 54°F 51°F30.03
NTKM3 - 8449130 - Nantucket Island, MA 32 mi68 min SSW 6G8.9 56°F 53°F30.04
NBGM3 40 mi68 min WSW 6G7 58°F 30.03
44013 - BOSTON 16 NM East of Boston, MA 49 mi48 min SE 1.9G1.9 53°F 50°F3 ft30.0052°F


Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KHYA BARNSTABLE MUNIBOARDMAN/POLANDO FIELD,MA 8 sm16 minvar 063 smOvercast Mist 55°F55°F100%29.99
KCQX CHATHAM MUNI,MA 10 sm46 minSW 0510 smOvercast55°F54°F94%30.02
KFMH CAPE COD COAST GUARD AIR STATION,MA 20 sm42 minWSW 105 smOvercast Mist 57°F57°F100%30.02
KPVC PROVINCETOWN MUNI,MA 22 sm29 minSSW 1110 smOvercast59°F57°F94%30.00
Link to 5 minute data for KHYA


Wind History from HYA
(wind in knots)
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Tide / Current for Sesuit Harbor, East Dennis, Cape Cod Bay, Massachusetts
   
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Sesuit Harbor, East Dennis, Cape Cod Bay, Massachusetts, Tide feet


Tide / Current for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
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Mon -- 02:03 AM EDT     0.00 knots Slack
Mon -- 04:29 AM EDT     Moonrise
Mon -- 05:29 AM EDT     Sunrise
Mon -- 05:30 AM EDT     2.15 knots Max Flood
Mon -- 08:34 AM EDT     -0.00 knots Slack
Mon -- 11:22 AM EDT     -1.91 knots Max Ebb
Mon -- 02:28 PM EDT     0.00 knots Slack
Mon -- 05:53 PM EDT     2.19 knots Max Flood
Mon -- 06:15 PM EDT     Moonset
Mon -- 07:43 PM EDT     Sunset
Mon -- 08:57 PM EDT     -0.00 knots Slack
Mon -- 11:46 PM EDT     -1.98 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Pollock Rip Channel, Massachusetts Current, knots
12
am
-1.6
1
am
-1
2
am
-0.1
3
am
0.9
4
am
1.7
5
am
2.1
6
am
2.1
7
am
1.6
8
am
0.7
9
am
-0.5
10
am
-1.4
11
am
-1.9
12
pm
-1.8
1
pm
-1.3
2
pm
-0.5
3
pm
0.6
4
pm
1.5
5
pm
2
6
pm
2.2
7
pm
1.9
8
pm
1.1
9
pm
-0
10
pm
-1.2
11
pm
-1.8


Weather Map
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GEOS Local Image of north east   
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Boston, MA,





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