Tuesday, May26, 2020
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Marine Weather and Tides
Winthrop Town, 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.

Sunrise 5:10AMSunset 8:11PM Tuesday May 26, 2020 3:44 PM EDT (19:44 UTC) Moonrise 8:19AMMoonset 11:58PM Illumination 22% Phase: Waxing Crescent; Moon at 5 days in cycle
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.
Marine Forecasts
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ANZ230 Boston Harbor- 116 Pm Edt Tue May 26 2020
This afternoon..SE winds 5 to 10 kt with gusts up to 20 kt. Waves around 2 ft.
Tonight..SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog. Vsby 1 to 3 nm.
Wed..SW winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. Vsby 1 to 3 nm.
Wed night..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Waves 1 foot or less.
Thu and Thu night..SW winds 10 to 15 kt with gusts up to 20 kt. Waves 1 foot or less.
Fri through Sat..SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers.
Sat night..W winds 5 to 10 kt. Waves 1 foot or less. A chance of showers. 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 116 Pm Edt Tue May 26 2020
Synopsis for massachusetts and rhode island coastal waters.. Fog and low clouds will thin by this afternoon as high pressure moves east of the waters. This will provide dry weather through Thursday along with developing south to southwest winds. A cold front will bring scattered showers and Thunderstorms Friday and Friday night. Winds then shift out of the west on Saturday. For information on possible hazardous weather beyond the 24-36 hour forecast period, please visit www.weather.gov/boston and follow the current hazards link above the map on the left.


7 Day Forecast for Marine Location Near Winthrop Town, MA
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location: 42.37, -70.98     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 261939 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 339 PM EDT Tue May 26 2020

SYNOPSIS. Summer-like warmth and mugginess away from the coast for the rest of the work week. We end the week with showers and an isolated chance for a thunderstorm or two on Friday. High pressure will bring drier and cooler weather for the second half of the weekend into early next week.

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/.

330 PM Update .

* Dense Fog Potential Tonight Near The South Coast

Anomalous upper level ridge in control will result in a rather mild night. Southerly flow and relatively high dewpoint air will result in overnight low temps only bottoming out in the upper 50s to the lower 60s. We may see some middle 50s near the south coast, Cape and Islands.

The main story overnight will be the northern extent of low clouds and fog. As the boundary layer cools this evening, low clouds and fog will move back onto the south coast. Given relatively high dewpoint air moving over the chilly ocean have gone ahead and issued a Dense Fog Advisory for the Cape and Islands. This might need to be expanded onto the rest of the south coast, but will let the next shift monitor trends. Patchy drizzle may develop too given saturated boundary layer.

Guidance shows surface winds shifting to more of a SSW direction, which should limit the fog threat outside of the southeast New England coast. However, some low clouds are likely south of the MA Turnpike.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH WEDNESDAY NIGHT/.

* Very Warm & A Bit Humid Away From The South Coast Wednesday

Wednesday .

The anomalous upper level ridge with height fields around 590 DM will remain in control of our weather. 850T are bit milder than today around +15C to +16C. This coupled with southwest flow should yield afternoon high temps in the upper 80s to near 90 away from cooling marine influence of the south coast. Unlike today, there will not be a sea breeze in Boston so they will get in on the summer- like warmth as well. It will be a bit muggy too with 60+ dewpoints, but southwest wind gusts of 20 to 25 mph during the afternoon which will help a bit. Dry weather will persist with the upper level ridge in control.

Wednesday night .

Model cross sections indicate low clouds developing from south to north Wednesday night. They will likely be more widespread, covering most if not all of the region by daybreak. We may even see some drizzle develop with some fog possible too especially near the south coast. Overnight lows will only drop into the lower to middle 60s in most locations with some 55 to 60 degree readings near the south coast.

LONG TERM /THURSDAY THROUGH TUESDAY/.

Thursday .

Morning fog likely to start off across coastal Rhode Island through the south shore of Cape Cod. One of the biggest questions for Thursday will be the extent to the cloud over. Models show a decent swath of moisture between 925 and 850 mb . especially across western MA/CT. PWATS range between 1.5 and 2.0 inches across the Mid Atlantic and up into southern New York. With some weak forcing an isolated shower isn't out of the question. At 18z the 850mb temperatures climb to 14 degrees (C), indicating afternoon highs could reach the mid-80s. Those along the coast will have cooler afternoon highs in the upper 60s to low 70s. If clouds don't erode those temperatures will be difficult to produce, but, with a predominant southwesterly flow we should be capable of mixing them out.

Friday .

A cold front will spark scattered showers and possibly an isolated thunderstorm. PWATS range from 1.5 to 2.0 inches across the Mid Atlantic to Southern New England. Thunderstorms may develop NW of our area where better instability is present and could move into western Massachusetts during the mid-afternoon with locally heavy downpours.

Saturday .

Temperatures still remain rather warm on Saturday with 850 mb temperatures between 8 and 10 degrees Celsius. A few morning showers could linger depending on the speed the front moving offshore. The greatest chance of seeing a shower will be in eastern Massachusetts, the Cape, and Islands. Clouds clear from west to east late in the day as drier and cooler air moves in from Quebec.

Sunday/Monday .

An area of high pressure moves out of from the Great Lakes Region Sunday into Monday with an upper-level through moves across New England and eastern Quebec. The 500 mb temperatures above Southern New England are -12 degrees Celsius! That will result in cooler than normal temperatures in the middle and upper 60s.

AVIATION /20Z TUESDAY THROUGH SUNDAY/.

Forecaster Confidence Levels .

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

18Z Update .

This afternoon . High confidence. VFR except for MVFR-IFR conditions across the Cape/Islands in lower clouds and fog patches. S winds 5 to 10 knots with sea breezes on the coast.

Tonight . Moderate confidence. Cooling boundary layer will result in low clouds and fog redeveloping across portions of the region. Given surface winds will shift to the SW, not sure how much of the IFR/low clouds make it north of the MA Turnpike. The LIFR conditions in fog, which may become dense should be confined to the south coast, Cape, and Islands.

Wednesday . High confidence. Lingering low clouds and fog will lift Wednesday morning with process being the slowest across the Cape and Islands. Otherwise, VFR conditions expected with SW wind gusts into the lower 20 knots during the afternoon across the southeast New England coast.

Wednesday night . Moderate to high confidence. The cooling boundary layer will once again result in low clouds overspreading the region from south to north. Appears this time the lower clouds will overspread most if not all of the region. So expect mainly lower end MVFR to IFR conditions. LIFR conditions with fog may impact the south coast, Cape, and Islands.

KBOS Terminal . Moderate to high confidence in TAF.

KBDL Terminal . Moderate to high confidence in TAF.

Outlook /Thursday through Sunday/ .

Thursday: Mainly VFR, with local IFR possible. Slight chance SHRA.

Thursday Night: Mainly VFR, with areas IFR possible. Breezy. Chance SHRA, chance TSRA.

Friday through Friday Night: Mainly VFR, with local IFR possible. Breezy. Chance SHRA, chance TSRA.

Saturday: Mainly VFR, with local MVFR possible. Breezy. Chance SHRA, chance TSRA.

Saturday Night: Mainly VFR, with local MVFR possible. Slight chance SHRA.

Sunday: VFR. Breezy.

MARINE.

Tonight through Wednesday night . High confidence. S to SW winds will continue through Wed night, but winds/seas should generally remain below SCA thresholds. Some choppy seas may develop Wednesday afternoon though with some lower 20 knot wind gusts near shore. The main issue will be for areas of fog that will be dense especially during the overnight to mid morning hours.

Outlook /Thursday through Sunday/ .

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

Thursday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers.

Friday: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers, chance of thunderstorms.

Friday Night: Winds less than 25 kt. Areas of rough seas. Thunderstorms likely, chance of rain showers.

Saturday: Winds less than 25 kt. Local rough seas. Chance of rain showers, chance of thunderstorms.

Saturday Night: Winds less than 25 kt. Local rough seas. Slight chance of rain showers.

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

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Dense Fog Advisory from 7 PM this evening to 8 AM EDT Wednesday for MAZ022>024. RI . Dense Fog Advisory from 7 PM this evening to 8 AM EDT Wednesday for RIZ008. MARINE . None.

SYNOPSIS . Frank/Gaucher NEAR TERM . Frank SHORT TERM . Frank LONG TERM . Gaucher AVIATION . Frank/Gaucher MARINE . Frank/Gaucher


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 4 mi62 min 62°F 53°F1021.2 hPa
44013 - BOSTON 16 NM East of Boston, MA 18 mi54 min E 7.8 G 7.8 55°F 54°F2 ft1021.4 hPa (-1.2)55°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 24 mi100 min SSE 7.8 G 9.7 53°F 45°F3 ft1020.6 hPa
FOXR1 - 8454000 - Providence, RI 45 mi62 min S 15 G 18 71°F 55°F1022.4 hPa
IOSN3 - Isle of Shoals, NH 45 mi44 min SE 15 G 15 53°F 1021.6 hPa (-1.5)53°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 46 mi54 min ESE 3.9 G 5.8 54°F 3 ft1022.7 hPa (-0.9)54°F
PVDR1 46 mi56 min SSE 13 G 14 68°F 1022.4 hPa63°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi56 min SW 17 G 18 66°F 1022.2 hPa
FRVM3 - 8447386 - Fall River, MA 47 mi56 min 73°F 56°F1022.6 hPa
BGXN3 - Great Bay Reserve, NH 48 mi119 min ESE 5.1 75°F 1022 hPa63°F
FRXM3 48 mi56 min 69°F 62°F
CPTR1 - 8452944 - Conimicut Light, RI 49 mi56 min 64°F 61°F1022.3 hPa

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA3 mi50 minENE 1010.00 miPartly Cloudy62°F55°F80%1022.1 hPa
East Milton, MA13 mi53 minS 7 mi82°F60°F47%1022.3 hPa
Beverly, Beverly Municipal Airport, MA15 mi51 minSSE 710.00 miFair66°F60°F81%1021.5 hPa
Norwood, Norwood Memorial Airport, MA16 mi51 minSSE 710.00 miPartly Cloudy83°F60°F46%1021 hPa
Laurence G Hanscom Field Airport, MA18 mi53 minE 10 G 2010.00 miA Few Clouds82°F64°F55%1021.8 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hrE9E9E9NE5E6E6E4E3E3CalmNE5NE3E4CalmCalmCalmSE64E6E7E9E9E8NE10
1 day agoE11E10E10E9E8E7E6E5NE5NE6NE5NE6NE7NE6NE7NE5NE7NE7NE5E6NE5E7E6E5
2 days agoNE15E17NE15E17E14E15NE11NE12NE13NE11N7NE9N8N8NE10NE12NE16NE12NE13E16E16E16NE13E13

Tide / Current Tables for Belle Isle Inlet entrance, Boston Harbor, Massachusetts
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Belle Isle Inlet entrance
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Tue -- 02:31 AM EDT     10.38 feet High Tide
Tue -- 05:12 AM EDT     Sunrise
Tue -- 08:19 AM EDT     Moonrise
Tue -- 08:56 AM EDT     -0.04 feet Low Tide
Tue -- 03:13 PM EDT     9.09 feet High Tide
Tue -- 08:09 PM EDT     Sunset
Tue -- 09:06 PM EDT     1.27 feet Low Tide
Tue -- 11:58 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.39.110.210.2974.72.40.6-00.82.64.66.68.29.18.77.45.63.72.11.31.93.7

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Tue -- 01:51 AM EDT     -0.00 knots Slack
Tue -- 05:02 AM EDT     -1.15 knots Max Ebb
Tue -- 05:12 AM EDT     Sunrise
Tue -- 08:19 AM EDT     Moonrise
Tue -- 08:45 AM EDT     0.00 knots Slack
Tue -- 10:49 AM EDT     1.19 knots Max Flood
Tue -- 02:20 PM EDT     -0.00 knots Slack
Tue -- 05:19 PM EDT     -0.98 knots Max Ebb
Tue -- 08:09 PM EDT     Sunset
Tue -- 08:59 PM EDT     0.00 knots Slack
Tue -- 11:07 PM EDT     1.25 knots Max Flood
Tue -- 11:58 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.6-0.1-0.7-1-1.1-1.1-0.9-0.60.211.210.80.2-0.4-0.8-1-0.9-0.8-0.600.91.2

Weather Map
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wmap_A
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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (15,3,4,5)
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Ground Weather Radar Station Boston, MA
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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 numerous 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.