Wednesday, July8, 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 5:14AMSunset 8:24PM Wednesday July 8, 2020 3:46 AM EDT (07:46 UTC) Moonrise 11:01PMMoonset 8:35AM Illumination 92% Phase: Waning Gibbous; Moon at 18 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 Am Edt Wed Jul 8 2020
Rest of tonight..S winds 5 to 10 kt. Waves 1 foot or less. A slight chance of showers with isolated tstms.
Wed..S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves around 2 ft. A chance of showers.
Wed night..SW winds 5 to 10 kt. Waves around 2 ft.
Thu..SW winds around 5 kt. Waves 1 foot or less.
Thu night..S winds 5 to 10 kt. Waves 1 foot or less. Patchy fog.
Fri..SE winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. Showers likely.
Fri night..SE winds 5 to 10 kt. Waves 2 to 3 ft. Showers likely.
Sat..E winds 5 to 10 kt. Waves 1 foot or less. Showers likely.
Sat night and Sun..SW winds 5 to 10 kt. Waves 1 foot or less. A chance of showers.
Sun night..SW winds 5 to 10 kt. Waves 1 foot or less. Winds and waves higher in and near tstms. 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 Am Edt Wed Jul 8 2020
Synopsis for massachusetts and rhode island coastal waters.. A ridge of high pressure will move east of the waters this afternoon. A cold front will slowly settle over the waters late Wednesday. Strengthening low pressure will move up along the carolina coast late Thursday and passing near cape cod 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 080556 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 156 AM EDT Wed Jul 8 2020

SYNOPSIS. A front lifts north of our region tonight with a few showers, but its main impact will be to deliver summer-like warmth and humidity the rest of this week into this weekend. Showers/thunderstorms will be possible each day with some heavy downpours, but much of this time will also feature dry weather. A stronger system late Friday into Saturday brings heavy rain and potential flooding issues.

NEAR TERM /UNTIL 6 AM THIS MORNING/.

155 AM Update .

The warm advection pattern/LLJ was resulting in widely scattered showers early this morning, mainly across RI/SE MA. Further northwest, skies were cloudy with patches of fog and even some drizzle. Little change in the overall weather is anticipated through daybreak with temps mainly in the middle to upper 60s.

SHORT TERM /6 AM THIS MORNING THROUGH 6 PM THURSDAY/. ** A few strong to severe thunderstorms possible Wednesday afternoon/evening across western & northern MA along with a low risk of flash flooding ***

Wednesday .

A few morning showers and isolated thunderstorm possible in the morning as the warm front exits the region. Morning clouds will eventually give way to at least partial sunshine. Warm sector overspreads the region in the afternoon and is accompanied by 925 mb temps of around +21C, which will support highs of 85-90 away from the south coast. This along with dew pts rising to around 70 will result in summer-like heat and humidity tomorrow.

This will also support MUCAPEs of around 2000 j/kg. Thus high CAPE environment combined with some forcing from approaching short wave yields a risk of a few strong to severe thunderstorms. Limiting factor is shear is marginal given fairly weak winds aloft along with best forcing for ascent across northern New England given track of short wave trough and its stronger wind fields. Thus greatest risk for southern New England will be western and northern MA. As such SPC has place northwest CT-western/central MA into a marginal risk in its day2 outlook. 12z HREF parameters signal this as well with greatest updraft potential and probs of thunder from NY state into VT/NH.

Given high CAPE strong winds and large hail are a concern. Perhaps equally or greater risk is flash flooding as PWATs climb to AOA 2 inches, surface dew pts around 70 and fairly weak winds aloft will yield slower moving storms that may have a tendency to back build toward better instability across western- central MA. For these reasons WPC has placed this area in a marginal risk (5-10% for flash flooding) for excessive rainfall. Not to be taken exact, but HREF shows this potential with 6 hr qpf ensemble max of 4-5 inch potential 18z-00z across northern MA possibly into northern CT/northwest RI. Again, just flagging the potential.

S-SW winds 10-15 mph expected but a few gusts to 20 mph possible especially over southeast MA.

Wednesday night .

Any early evening convection will diminish with sunset yielding a mainly dry night. However warm and humid with dew pts in the 60s. This combined with any rainfall from the afternoon may lead to areas of fog.

LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/.

Highlights .

* Hot and humid conditions continue

* Scattered showers and thunderstorms on Thursday

* Widespread, heavy rain at times Friday into Saturday

Details .

Still looking like there will be a tropical feel to our weather most of this portion of the forecast. Near to above normal temperatures continue through next Tuesday. Expecting dew points in in the mid 60s to lower 70s, which is high to oppressive humidity for most. Heat Advisories may be needed Thursday.

The tropical feel will also mean a risk for downpours at times. The greatest risk will be during the afternoon and evening hours Thursday into Friday. Some questions remain about the timing of a coastal low pressure Friday into this weekend. The current timing places the most likely period for more widespread rainfall is Friday evening into Saturday. This timing is subject to change with later forecasts.

Confidence in the details really drop off Sunday into Tuesday. It will all come down to how far offshore a cold front can make it offshore before it stalls. If this front is off to our east, the risk for showers and thunderstorms will be less. At this time, thinking this front does stall just off to our east, but a low pressure may drag it closer to the coast heading into Tuesday.

AVIATION /06Z WEDNESDAY THROUGH SUNDAY/. Forecaster Confidence Levels .

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

06Z Update .

Today . Moderate confidence.

Through 12z this morning IFR-LIFR conditions dominate NW of the BOS to PVD corridor. Southeast of this line mainly MVFR conditions expected. A few spot showers are possible with some patchy drizzle across the interior early this morning. Otherwise, improvement to VFR conditions should occur in most locations by afternoon. SW winds may gust to between 20 and 25 knots along the coastal plain during the afternoon. The main concern will then turn to the risk for a few strong t-storms with the main focus across northern MA and into parts of interior southern New England . roughly in the 20z to 02z time frame. However, an isolated t-storm can not be ruled out a few hours earlier.

Tonight . Moderate confidence.

The bulk of the convection should come to an end by 02z. MVFR- IFR conditions should develop tonight south of the Pike with the lowest conditions most likely across the Cape/Islands. VFR conditions may persist in many locations north of the MA turnpike. SSW winds of 5 to 15 knots.

Thursday . High confidence.

Mainly VFR conditions anticipated for most of the day. The exception might be near the southeast New England coast, where lower clouds may flirt with this region at times. Dry weather dominates, but an isolated spot shower/t-storm can not be ruled out. S winds of 5 to 15 knots.

KBOS Terminal . Moderate confidence in TAF. Greatest risk for a t-storm is between 20z and 02z.

KBDL Terminal . Moderate confidence in TAF. Greatest risk for a t-storm is between 20z and 02z.

Outlook /Thursday Night through Sunday/ .

Thursday: VFR. Slight chance SHRA, isolated TSRA.

Thursday Night: Mainly VFR, with local MVFR possible. Slight chance SHRA, patchy BR.

Friday: Mainly VFR, with local IFR possible. Chance SHRA, isolated TSRA, patchy BR.

Friday Night: MVFR/IFR conditions possible. SHRA likely, isolated TSRA.

Saturday: Mainly VFR, with local IFR possible. SHRA likely, isolated TSRA.

Saturday Night through Sunday: VFR. Chance SHRA, isolated TSRA.

MARINE. Tonight . Low clouds increase as the night progresses with patchy fog and drizzle possible. Also a few showers possible too. S-SE winds but trending S-SW as warm front pushes into the waters toward morning.

Wednesday . Warm front lifts north of the waters with winds becoming SW 10-15 kt but gusts to 20 kt possible near shore. A few thunderstorms possible northern MA waters in the afternoon. Morning patchy fog and drizzle improve by midday.

Wednesday night . any early evening storms over the northern MA waters dissipate with sunset. Light SSW winds continue. Warm and humid conditions may result in patchy fog.

Outlook /Thursday Night through Sunday/ .

Thursday: Winds less than 25 kt.

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

Friday: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers, patchy fog.

Friday Night: Winds less than 25 kt. Areas of rough seas. Rain showers likely, isolated thunderstorms.

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

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

Sunday: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers, isolated thunderstorms.

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

SYNOPSIS . Belk/Nocera NEAR TERM . Frank SHORT TERM . Nocera LONG TERM . Belk AVIATION . Frank/Belk MARINE . Belk/Nocera


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 4 mi46 min 69°F 66°F1017.1 hPa (-1.3)
44013 - BOSTON 16 NM East of Boston, MA 18 mi176 min SSE 7.8 G 7.8 65°F 65°F3 ft1018 hPa65°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 24 mi102 min SSW 5.8 G 7.8 63°F 3 ft1016.5 hPa
FOXR1 - 8454000 - Providence, RI 45 mi46 min S 6 G 7 69°F 72°F1018.6 hPa (-1.1)
IOSN3 - Isle of Shoals, NH 45 mi46 min S 11 G 12 64°F 1017.3 hPa (-1.3)64°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 46 mi176 min S 14 G 16 64°F 3 ft1019.1 hPa62°F
PVDR1 46 mi46 min S 6 G 8 70°F 1018.7 hPa (-1.1)68°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi46 min SSE 1.9 G 4.1 69°F 1018.7 hPa (-1.0)
FRVM3 - 8447386 - Fall River, MA 47 mi46 min 69°F 74°F1018.9 hPa (-1.0)
BGXN3 - Great Bay Reserve, NH 48 mi61 min SE 1.9 67°F 1018 hPa65°F
FRXM3 48 mi46 min 69°F 67°F
CPTR1 - 8452944 - Conimicut Light, RI 49 mi46 min 69°F 73°F1018.5 hPa (-1.2)

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA3 mi52 minS 710.00 miOvercast67°F63°F87%1018.1 hPa
East Milton, MA13 mi55 minS 10 mi65°F63°F93%1019.1 hPa
Beverly, Beverly Municipal Airport, MA15 mi53 minSSE 610.00 miOvercast68°F64°F87%1017.2 hPa
Norwood, Norwood Memorial Airport, MA16 mi53 minS 310.00 miOvercast68°F63°F84%1018.2 hPa
Laurence G Hanscom Field Airport, MA18 mi55 minSSW 410.00 miOvercast67°F64°F91%1018.8 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hrSE4S5S4SE6SE6SE7SE7SE7E12E12SE8S11S12S13S11S8S12S11S10S11S7S7S7S7
1 day agoN4N6N5N5N8N6NE5E8NE10E10E13E12E11E11SE8E9E9E10SE8S7SE4S6S5SE3
2 days agoS5S8S7SW8SW6W4W3SW43SE9E9E11E13E10E7NE6CalmS5S7W9E10SE4E4NE6

Tide / Current Tables for Belle Isle Inlet entrance, Boston Harbor, Massachusetts
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Belle Isle Inlet entrance
Click for Map
Wed -- 02:14 AM EDT     10.83 feet High Tide
Wed -- 05:15 AM EDT     Sunrise
Wed -- 08:35 AM EDT     -0.35 feet Low Tide
Wed -- 08:35 AM EDT     Moonset
Wed -- 02:54 PM EDT     9.49 feet High Tide
Wed -- 08:22 PM EDT     Sunset
Wed -- 08:45 PM EDT     0.86 feet Low Tide
Wed -- 11:01 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.89.810.810.596.84.21.6-0.1-0.20.92.757.399.58.87.35.331.30.91.93.6

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Wed -- 01:35 AM EDT     -0.00 knots Slack
Wed -- 05:15 AM EDT     Sunrise
Wed -- 05:56 AM EDT     -1.34 knots Max Ebb
Wed -- 08:13 AM EDT     0.00 knots Slack
Wed -- 08:35 AM EDT     Moonset
Wed -- 11:30 AM EDT     1.22 knots Max Flood
Wed -- 02:12 PM EDT     -0.00 knots Slack
Wed -- 06:25 PM EDT     -1.18 knots Max Ebb
Wed -- 08:22 PM EDT     Sunset
Wed -- 08:34 PM EDT     0.00 knots Slack
Wed -- 11:00 PM EDT     Moonrise
Wed -- 11:49 PM EDT     1.14 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.4-0.2-0.7-1.1-1.3-1.3-1.1-0.20.711.21.20.70.1-0.4-0.8-1-1.2-1.1-0.50.40.91.1

Weather Map
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GEOS Local Image of    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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Wind Forecast for Boston, MA (3,6,7,8)
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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.