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Marine Weather and Tides Sandwich, MA Version 3.4

NOTICE 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

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Sunrise 5:54AM

Sunset 7:34PM

Wednesday August 21, 2019 2:57 AM EDT (06:57 UTC)

Moonrise 10:44PM

Moonset 11:34AM

Illumination 69%

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 210541 afdbox area forecast discussion national weather service boston norton ma 141 am edt Wed aug 21 2019 Synopsis High pressure over southern new england moves offshore tonight providing seasonable dry weather. A warm front moves across the region Wednesday providing scattered showers and thunderstorms along with increasing heat and humidity. A cold front Thursday will bring another round of scattered showers and thunderstorms. The front moves offshore Friday with dry weather to follow into the weekend with mild days and cool nights along with comfortable humidity. Near term until 6 am this morning Satellite imagery shows clouds in western ny and pa. Northeast radar mosaic shows showers thunder moving into western pa and approaching the i-79 corridor. Movement of the clouds and showers would bring them into the ct valley at about 10-12z 6-8 am, assuming that they hold together through that time. There are also a couple of isolated showers farther east in pa, but they are moving in to more stable air and should diminish. 9 pm observations show dew points in the low to mid 60s. No expectation that they will get any lower than that overnight. Hourly observed temperatures were 3-4f lower than forecast, but dew points suggest the min temperature forecast remains reasonable and so no changes planned. Extrapolation of observed showers is a couple of hours slower than the forecast, but within the margin of uncertainty. Low risk for some elevated convection toward sunrise along the south coast of ma ri and over western ma ct as warm front aloft surges northeastward. So no changes in timing for this update, but the potential for a slower onset is noted. Short term 6 am this morning through 6 pm Thursday Wednesday ... very complex forecast especially afternoon convection and severity. Warm front lifts northward into the region Wed morning. Some of the guidance suggest an active warm front with lots of showers t-storms. If this verifies lots of cloud debris would linger into the afternoon and could suppress afternoon convection. In addition lots of morning convection could delay warm frontal passage and thus diminish risk of strong afternoon storms. Conversely some of the guidance does not have much if any warm frontal precip during the morning followed by warm sector overspreading southern new england with 12z href and ec offering up to 2500 j kg of sb cape. Thus robust warm sector combined with up to 30 kt of deep layer shear. These high CAPE and modest shear profiles combined with forcing for ascent from short wave trough moving from ny to vt nh would support a low to moderate risk of strong to severe storms. However this convective forecast will hinge on warm frontal morning convection and how quickly warm sector can overspread ma ri ct. Some morning warm frontal convection could enhance diurnal storms with leftover boundaries along with differential heating from leftover cloud debris. So overall lots of uncertainty regarding severe potential tomorrow. Hopefully 00z runs show a trend. Otherwise gradually becoming more humid tomorrow especially if warm front lifts north of the area. Long term Thursday night through Tuesday Highlights... * hot and humid Thu with a risk for a few showers t-storms near and south of the pike, shifting to the south coast Thu night * cooler and less humid fri * pleasantly warm days and cool nights this weekend into early next week details... Thursday into Thursday night... another robust mid level shortwave will be rotating across the great lakes with downstream SW flow aloft across new eng. Cold front moves into the interior Thu but slows and eventually gets hung up near the south coast Thu evening. Models show some drier air aloft moving into sne Thu morning before moisture gradually deepens later Thu thu evening, especially south of the pike. It will be a hot and humid day with partly to mostly sunny skies. 925 mb temps 22-24c support highs around 90, except cooler near the south coast and higher terrain in ma. Dewpoints lower 70s in the coastal plain but falling through the 60s interior behind the front. Marginal instability develops Thu with forecast capes around 1000 j kg, focused south of the pike. Models are not very bullish on convective precip, likely due to presence of mid level dry air which may limit convective activity during the day. Best chance for a few afternoon t-storms will likely be near and south of the pike ahead of the front, and there is enough deep layer shear for an isolated strong to severe storm. While instability diminishes after dark, better chance for showers and a few t-storms may be Thu night along the south coast as deeper moisture with pwat plume nearing 2 inches moves up along the south coast ahead of a shortwave and along the stalled frontal boundary which eventually pushes south and offshore by late Thu night. Friday... there is some uncertainty regarding how quickly clearing occurs near the south coast. It is possible clouds may linger into Fri near the south coast with a risk of a few showers. Otherwise, more sunshine likely north of the pike. Cooler post frontal airmass will yield highs mainly mid 70s to around 80 with low humidity. Saturday through Tuesday... ecmwf appears to be an outlier with development of closed low over new eng this weekend into early next week and not really supported

by majority of its ensemble members. Trend is for mid level ridging to develop across the NE late in the weekend into early next week, with shower threat possibly increasing by Tue depending on timing of next shortwave. Coolest days likely Sun Mon with high pres in the maritimes with NE flow and will have to watch for some lower clouds during this time period. Overall, looking at highs mostly in the 70s and lows in the 50s this weekend into early next week, with highs in the 60s possible along the east coast Sun mon. Aviation 06z Wednesday through Sunday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Thursday ... Moderate confidence. Rest of tonight ... VFR. Today... vfr, with MVFR CIGS vsbys in showers and scattered thunderstorms. A few showers are possible this morning in ct and western ma, and are possible in all areas this afternoon and evening. The best chance for showers tstms will be in northern ct and western central ma in the afternoon and evening. A few strong storms are possible with gusty winds, frequent lightning, and heavy downpours. Tonight... MVFRVFR with scattered showers tstms especially in the evening. Southwest winds gusting to 20 kt, especially over CAPE cod and islands. Thursday... vfr MVFR in the morning...VFR in the afternoon with brief MVFR in showers tstms possible. Kbos terminal... moderate to high uncertainty in timing and coverage of showers tstms. A few showers storms possible mid to late morning, but best chance will be mid to late afternoon. Kbdl terminal... Moderate to high uncertainty in timing and coverage of showers tstms. A few showers storms possible after 7 am, but best chance will be mid to late afternoon. Outlook Thursday night through Sunday ... Moderate confidence Thursday night: mainlyVFR, with local MVFR possible. Slight chance shra. Friday through Sunday:VFR. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Thursday ... High confidence. Tonight ... Tranquil weather with 1020 mb high over pa drifting eastward. Dry weather and good vsby expected along with tranquil seas. Wednesday ... Warm front lifts into the waters with scattered showers and t-storms. Low prob for a few strong storms. Wednesday night ... Warm front lifts north into nh me waters with evening scattered showers t-storms possible. Patchy fog possible. Outlook Thursday night through Sunday ... Moderate confidence. Thursday: winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers, slight chance of thunderstorms. Thursday night: winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers, chance of thunderstorms. Friday through Friday night: winds less than 25 kt. Areas of seas approaching 5 ft. Saturday: winds less than 25 kt. Seas locally approaching 5 ft. Saturday night: winds less than 25 kt. Sunday: winds less than 25 kt. Areas of seas approaching 5 ft. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... None. Synopsis... Kjc nocera near term... Wtb kjc nocera short term... Nocera long term... Kjc aviation... Wtb kjc nocera marine... Wtb kjc nocera

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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	57 min			71°F
WAXM3 - Waquoit Bay Reserve, MA	14 mi	72 min	S 1	73°F			1018 hPa	71°F
BZBM3 - 8447930 - Woods Hole, MA	20 mi	63 min		71°F	74°F		1017.9 hPa
44020 - NANTUCKET SOUND	23 mi	47 min	SSW 12 G 14	73°F	75°F			70°F
44018 - SE Cape Cod 30NM East of Nantucket, MA	35 mi	67 min	S 7.8 G 9.7	69°F		1 ft	1017.4 hPa (-0.6)	66°F
FRVM3 - 8447386 - Fall River, MA	36 mi	63 min		74°F	80°F		1018.1 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA	37 mi	63 min	SSW 2.9 G 5.1	76°F			1017.7 hPa
FRXM3	37 mi	63 min		74°F				60°F
BUZM3 - Buzzards Bay, MA	39 mi	57 min	SSW 11 G 11	74°F			1018.4 hPa (+0.0)
NTKM3 - 8449130 - Nantucket Island, MA	40 mi	63 min	SSW 5.1 G 8	71°F	77°F		1018.2 hPa
44013 - BOSTON 16 NM East of Boston, MA	40 mi	67 min		69°F	70°F	1 ft	1016 hPa (-0.3)
PRUR1	45 mi	63 min		72°F				65°F
CPTR1 - 8452944 - Conimicut Light, RI	46 mi	63 min	S 8 G 8.9	74°F	78°F		1017.9 hPa
NAXR1 - Narragansett Bay Reserve, RI	46 mi	72 min	SW 2.9	71°F			1018 hPa	65°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI	46 mi	63 min	SW 1.9 G 4.1	72°F			1018.3 hPa
PVDR1	47 mi	63 min	S 4.1 G 6	74°F			1018 hPa	65°F
FOXR1 - 8454000 - Providence, RI	48 mi	63 min	SSW 2.9 G 4.1	72°F	75°F		1017.7 hPa
NWPR1 - 8452660 - Newport, RI	48 mi	63 min	S 5.1 G 5.1	72°F	68°F		1017.8 hPa

Wind History for Borden Flats Light at Fall River, MA

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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	3 hrs	N 0	10.00 mi	Fair	64°F	62°F	94%	1017.9 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA	13 mi	4 hrs	N 0	10.00 mi	Fair	70°F	64°F	82%	1017.6 hPa
Plymouth, Plymouth Municipal Airport, MA	16 mi	3.1 hrs	N 0	10.00 mi	Fair	66°F	64°F	93%	1017.7 hPa
Provincetown Municipal Airport, MA	22 mi	4 hrs	S 6	10.00 mi	Fair	70°F	66°F	90%	1018 hPa
Marshfield Airport, MA	24 mi	4.4 hrs	N 0	10.00 mi	Fair	68°F	66°F	94%	1017.6 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 and Satellite Images

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GOES 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 (2,6,7,8)

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Ground Weather Radar Station Boston, MA

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Disclaimer: The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.