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Marine Weather and Tides Sandwich, MA Version 3.4

NOTICE 12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed. 10/9/2019 Updated the Marine Zones. 9/4/2019 Fixed the weather maps due to NOAA moving them. 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

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Sunrise 5:17AM

Sunset 8:16PM

Monday July 13, 2020 7:01 PM EDT (23:01 UTC)

Moonrise 12:34AM

Moonset 1:38PM

Illumination 39%

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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7 Day Forecast for Marine Location Near Sandwich CDP, MA

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Area Discussion for - Boston, MA

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FXUS61 KBOX 132250 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 650 PM EDT Mon Jul 13 2020

SYNOPSIS. Showers and thunderstorms diminish early tonight followed by another mild and muggy night. Breezy, cooler and less humid conditions on Tuesday with showers and scattered thunderstorms in the afternoon. High pressure then brings fair weather for Wednesday and Thursday. Scattered showers and thunderstorms return early Friday and Friday night. High pressure then bring rain-free but very warm weather for Saturday and Sunday. Another cold front may bring a few thunderstorms Monday.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/.

650 PM Update .

Showers/storms in NE MA and SE MA had dissipated by 640 PM. A couple of showers/storms were moving from Eastern NY into the Berkshires. Storms in NE CT were diminishing, and one storm south of Quabbin Res was moving east toward some lingering energy . 2000 J/Kg in Srn Worcester Co. Expect leftover convection to slowly diminish through early tonight.

The rest of the night will feature fair but humid air, with temperatures falling into the mid and upper 60s. Fog will linger along the coast, primarily near Cape Cod and the Islands.

Previous Update .

Thunderstorms coverage diminish into the evening with areas of fog developing along the coastal areas and interior fog-prone areas, especially over areas where rain has fallen. Fog coverage will also hinge on the extent to which boundary layer winds decouple. We also cannot rule out some isolated showers but it should be a mostly dry night for most locations. The Berkshires East Slopes will see the coolest readings with overnight lows in the upper 50s to low 60s thanks to dew points falling into the upper 50s. As for most of us away from the interior high terrain, another muggy and mild night is in store with lows bottoming out in the mid 60s.

SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/. Tuesday .

* Much cooler day than of late with scattered thunderstorms in the afternoon.

572 Dm closed low slides east over VT/NH, surface low slides offshore into Gulf of Maine. This reinforces onshore flow from the northeast over Eastern MA and RI, and northerly flow over the interior. Lobe of vorticity traversing the area will lead to showers and scattered thunderstorms areawide. Best thunderstorm coverage looks to be in Central MA into Northern RI during the afternoon hours, which is far enough removed from the stabilizing effect of onshore flow and drier air from the cold air advection out in Western MA/CT. However, we have an impressive cold pool aloft with - 12 to -14C at 500mb. This is anomalously cold by mid July standards with only the 10th percentile according to NAEFS Situational Awareness Table. There may be some strong storms particularly over Central MA in the afternoon with CAM guidance showing 1000 J/kg of MLCAPE and good low-level lapse rates of up to 7.5C/km. But with dew points falling into the upper 50s to low 60s, not expecting severe weather, in line with SPC having our entire area in the general thunder category. Also expect plenty of diurnal cumulus with the anomalously strong cold air advection for mid-July standards in Southern New England. Overall, expect a considerably cooler day on Tuesday with highs generally in the mid 70s to mid 80s with mixing up to 850mb and 850mb temperatures are between +12 to +14C. People in Western MA/CT would feel particularly refreshing with dew points falling into the upper 50s by the afternoon hours.

Tuesday night .

Showers diminish into the overnight hours and temperatures will be much cooler than of late, with much of interior MA falling into the 50s. Enjoy!

LONG TERM /WEDNESDAY THROUGH MONDAY/. Big Picture .

Upper low moves offshore Wednesday morning. Upper ridge builds over New England during Wednesday and then moves offshore on Thursday. Shortwave in the Nrn Tier zonal flow crosses on Friday. Another ridge then builds overhead Saturday through next Monday.

Mid-July normals for 500-mb contours are around 580 Dm. Forecast values are in the mid 580s to low 590s through the period, so above normal temperatures are expected most of the period. Shallow surface east-northeast winds may undercut the deep warmth Wed-Thursday, especially in Eastern MA. But as those winds become south-southwest later week and and weekend that should trend back to above-normal temperatures.

Model mass fields are similar through Friday, with only minor differences over the weekend. Those differences are the usual ones dealing with shortwaves in a zonal flow. Confidence is moderate-high through through Monday.

Daily details .

Wednesday .

Upper low and cold pool from Tuesday will be moving off for the Maritimes Wednesday. But it remains close enough Wednesday morning that the cold pool instability may generate a few morning showers in Eastern MA. High pressure builds south from Nrn New England, bringing a low-level northeast flow through at least the Central Hills. Dew points in the mid 50s to low 60s will mean a comfortable day for most.

Models hint at some pcpn in Northwest MA in the afternoon/evening, but parameters are weak . forecast CAPE less than 100, LI at plus 4 . and leave that scenario less than credible. Mixing to 900-925 mb taps favorable temps for sfc max values in the 70s and low 80s. Low level east flow will keep the cooler temps in eastern MA.

Quiet weather Wednesday night with light wind and areas of fog.

Thursday .

High pressure remains along the coast and favors another dry day on Thursday. Overall a south-southeast surface flow with westerly winds aloft. GFS again hints at afternoon light pcpn in Northwest MA, but again the instability parameters are weak at best. Mixing to 850 mb taps 11-13C temps, so max sfc temps in the upper 70s to lower 80s, possibly a little cooler where the southeast wind is off the water.

Friday .

Upper shortwave moves east from the Great Lakes, driving a surface cold front east. Southwest upper jet increases during the day, with the right entrance to the jet moving over Srn New England. Lifted Index is forecast sub-zero Friday afternoon. PW values climb to between 1.5 and 2.0 inches. Will forecast scattered showers/tstms, some with local downpoours. Convection will linger into Friday night. The cold front is forecast to move through Friday night . expect the chance of convection to end after passage.

Saturday through Monday .

Upper ridge and surface high pressure build over Southern New England Saturday and Sunday. Expect dry weather over the weekend. Some signs of a shortwave forcing its way through the flow on Monday. A cold front works down from the north on Monday and may bring a few showers/thunder. Mixing up to 800 mb will tap 12-13C temps at that level, similar to 17-18C at 850 mb. Expect max sfc temps in the upper 80s and low 90s. Huidity levels will be high, with dew points 65 to 70 during the period . with heat index values in the low to mid 90s Sunday and Monday.

AVIATION /00Z TUESDAY THROUGH SATURDAY/. Forecaster Confidence Levels .

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

Tonight: Moderate confidence.

Showers and thunderstorms diminishing in coverage early in the night. Will see conditions across the interior improve to VFR, but not out of the question a few spot that had showers/storms see some patchy fog develop, especially in terminals in fog- prone areas such as KBAF and KBDL. Cape Cod and the Island terminals, especially KACK remaining IFR to LIFR in stratus and fog.

Tuesday: Moderate confidence.

VFR across the interior, but MVFR to LIFR across eastern coastal locations including BOS. Winds generally out of the north, but eastern coastal areas will see onshore flow.

Tuesday night: High confidence.

Mostly VFR conditions with northeast to northerly flow at 5 to 10 kt. Drier, cooler air advecting into the region should limit development of patchy fog and low clouds to the Eastern MA coast.

KBOS Terminal . Moderate confidence in TAF.

KBDL Terminal . Moderate confidence in TAF.

Outlook /Wednesday through Saturday/ .

Wednesday: Mainly VFR, with local MVFR possible.

Wednesday Night: Mainly VFR, with local IFR possible.

Thursday: VFR.

Thursday Night: Mainly VFR, with local IFR possible. Breezy. Chance SHRA.

Friday: Mainly MVFR, with areas VFR possible. Breezy. Chance SHRA, slight chance TSRA.

Friday Night: Mainly VFR, with areas IFR possible. Slight chance SHRA, isolated TSRA.

Saturday: VFR.

MARINE.

Small Craft Advisories remain in effect for all waters through Tue afternoon due to 5 ft seas over the outer southern waters.

A High Surf Advisory remains in effect for the Islands (including Block Island) until Tuesday evening for the south- facing beaches due to the rip current risk and breaking 4-6 ft waves in the surf zone.

Lower clouds and fog may again develop on the southern waters tonight. Scattered thunderstorms could develop on Tuesday afternoon. Winds turning from southwest to northwest and then northerly by Tuesday afternoon. North winds could gust up to 20 kts Tuesday afternoon into evening over the Eastern waters but stay below small craft criteria.

Outlook /Wednesday through Saturday/ .

Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.

Wednesday Night: Winds less than 25 kt. Seas locally approaching 5 ft.

Thursday: Winds less than 25 kt.

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

Friday through Friday Night: Winds less than 25 kt. Chance of rain showers, slight chance of thunderstorms.

Saturday: Winds less than 25 kt.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . High Surf Advisory until 8 PM EDT Tuesday for MAZ023-024. RI . High Surf Advisory until 8 PM EDT Tuesday for RIZ008. MARINE . Small Craft Advisory until 8 PM EDT Tuesday for ANZ235-237-255- 256.

SYNOPSIS . WTB/Chai NEAR TERM . WTB/Loconto/Chai SHORT TERM . Chai LONG TERM . WTB AVIATION . WTB/Loconto/Chai MARINE . WTB/Chai HYDROLOGY .

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
44090	9 mi	35 min			70°F	1 ft
WAXM3 - Waquoit Bay Reserve, MA	14 mi	137 min	SSE 2.9	76°F			1008 hPa	71°F
BZBM3 - 8447930 - Woods Hole, MA	20 mi	68 min			73°F
44020 - NANTUCKET SOUND	23 mi	32 min	S 12 G 14		73°F		1007.8 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA	35 mi	72 min	S 9.7 G 9.7	72°F		2 ft	1007.9 hPa (-0.0)	66°F
FRVM3 - 8447386 - Fall River, MA	36 mi	68 min			78°F
BUZM3 - Buzzards Bay, MA	39 mi	62 min	SW 12 G 12				1009.2 hPa (-0.0)
44013 - BOSTON 16 NM East of Boston, MA	40 mi	72 min	NE 14 G 14	71°F	71°F	2 ft	1006.5 hPa (-0.0)	70°F
NTKM3 - 8449130 - Nantucket Island, MA	40 mi	68 min			74°F
CPTR1 - 8452944 - Conimicut Light, RI	46 mi	68 min			79°F
NAXR1 - Narragansett Bay Reserve, RI	46 mi	77 min	SSW 6	79°F			1008 hPa	71°F
FOXR1 - 8454000 - Providence, RI	48 mi	68 min			76°F
NWPR1 - 8452660 - Newport, RI	48 mi	68 min			69°F

Wind History for Borden Flats Light at Fall River, MA

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SW14 G18

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Otis Air National Guard Base, MA	9 mi	66 min	SW 12	10.00 mi	A Few Clouds	79°F	69°F	74%	1008.5 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA	13 mi	66 min	SSW 9	10.00 mi	Overcast	77°F	72°F	85%	1008.1 hPa
Plymouth, Plymouth Municipal Airport, MA	16 mi	70 min	S 7	10.00 mi	Fair	81°F	70°F	69%	1007.6 hPa
Provincetown Municipal Airport, MA	22 mi	66 min	S 9	10.00 mi	Fair	76°F	71°F	85%	1008.3 hPa
Marshfield Airport, MA	24 mi	67 min	Var 5 G 13	10.00 mi	Fair	86°F	68°F	55%	1007.4 hPa

Link to 5 minute data for KFMH

Wind History from FMH (wind in knots)

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Tide / Current Tables for Cape Cod Canal (East Entrance), Massachusetts

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Tide / Current Tables for Cape Cod Canal, Massachusetts Current

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Weather Map

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GEOS Local Image of Northeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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Wind Forecast for Boston, MA (19,4,5,8)

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Ground Weather Radar Station Boston, MA

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