Wednesday, April14, 2021
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Marine Weather and Tides
Chelsea, MA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:02AMSunset 7:26PM Wednesday April 14, 2021 6:34 AM EDT (10:34 UTC) Moonrise 7:27AMMoonset 10:04PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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- 416 Am Edt Wed Apr 14 2021
Today..E winds 5 to 10 kt. Waves around 2 ft.
Tonight..SE winds 5 to 10 kt. Waves around 2 ft.
Thu..E winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Gusts up to 20 kt. Waves around 2 ft.
Thu night..E winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Showers. Vsby 1 to 3 nm.
Fri..E winds 15 to 20 kt, becoming ne 10 to 15 kt in the afternoon. Gusts up to 30 kt. Waves 2 to 3 ft, except 4 to 7 ft at the outer harbor entrance. Showers. Vsby 1 nm or less.
Fri night..N winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft, except 4 to 7 ft at the outer harbor entrance. Showers likely.
Sat..N winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft, except 4 to 7 ft at the outer harbor entrance. A chance of showers.
Sat night through Sun night..S winds around 5 kt. Waves 1 foot or less, except 3 to 5 ft at the outer harbor entrance. 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 416 Am Edt Wed Apr 14 2021
Synopsis for massachusetts and rhode island coastal waters.. Today high pressure builds across the waters, with winds easing. Thursday low pressure will emerge off the nj coast, and may strengthen into a gale center Friday as it tracks south of new england. High pressure builds in later in the weekend. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/erh/ghwo?sid=box.


7 Day Forecast for Marine Location Near Chelsea, MA
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location: 42.37, -71.06     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 140808 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 408 AM EDT Wed Apr 14 2021

SYNOPSIS.

Partial sunshine will yield a spring-like day except for the immediate eastern MA coast, where it will remain cool with onshore winds. Approaching low pressure will result in showers developing overnight across western Massachusetts and western Connecticut, gradually overspreading the region Thursday into early Thursday evening. Widespread heavy rain is anticipated Thursday night into at least part of Friday with wet snow expected in the Berkshires and perhaps for a time across other portions of interior southern New England. Gradual improvement is expected over the weekend as the storm exits out to sea, with dry milder weather likely Sunday. Rain may return early to mid week.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

405 AM Update .

* Spring-like temps this afternoon across the interior, but it will remain cool along the eastern MA coast

Surface trough pushing westward early this morning coupled with some shortwave energy was resulting in an abundance of mid level cloudiness. This also has allowed a few showers to develop mainly along the eastern MA coast. Expect these widely scattered showers to wind down by mid morning if not earlier as some shortwave ridging builds into the region.

This shortwave ridging will also allow in partial sunshine developing today and a wide range in high temperatures this afternoon. Onshore flow will result in a rather cool day with high temperatures only in the lower to middle 50s along the immediate eastern MA coast as well as the Cape and Islands. Meanwhile, 925T between +11C and +12C in western MA/western CT coupled with some April sunshine should allow highs to top out near 70 in the Lower CT River Valley. In between the extremes of the CT River Valley and the eastern MA coast; highs should mainly be in the 60s.

After a few early morning showers dissipate across the eastern MA coast by mid morning, dry weather will dominate today. However, differential heating and some convergence along a surface trough may trigger a brief spot shower or two late in the day across western MA/CT.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/.

Tonight .

Deep closed upper level low will slowly move east across the Great Lakes tonight. This will be a slow process given upper level ridging in place in our region, so much of the evening will be dry other than a few spot showers possible across western MA and CT. The threat for showers though will increase across western MA and CT after midnight as the forcing for ascent increases. Meanwhile, we expect enough upper level ridging to keep eastern MA/RI dry right through daybreak.

Low temperatures tonight will range from the middle to upper 30s across east and especially southeast New England; where clouds will be slowest to increase. Further west where clouds will increase earlier; overnight low temperatures should mainly be in the lower to middle 40s.

Thursday .

The anomalous closed upper level low will continue to work slowly east on Thursday and into southwest NY State by late in the afternoon. At the same time, a surface low will be intensifying off the mid Atlantic coast. As mentioned earlier, because of the blocking pattern in place rain will only slowly work eastward on Thursday. Showers Thursday morning should mainly be confined to western MA and northern CT. The showers should spread eastward Thursday afternoon, but it may take until late afternoon or early evening to finally reach the eastern MA coast.

High temperatures Thursday will mainly be in the upper 40s to near 50 across western MA early in the day, but with slowly falling temps thereafter. Temperatures may briefly reach the lower to middle 50s across interior eastern MA/RI; where some peeks of sunshine are possible in the morning.

LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/.

Thursday night and Friday .

A period of heavy rain and some wet high elevation snow is expected Thursday night. Precipitation then lingers on Friday into Friday evening but will be of a lighter and more scattered nature associated with the comma head as the upper low exits. This upper low (and its reflection at the surface) are the focus during this period as they slowly become vertically stacked by Friday evening. This is a very dynamic system with an anomalous moisture plume (PWATS >0.75") directed into New England. Mid level vorticity advection and strong low level wind fields (35 to 45 kt 850 mb jet) will provide ample lift for a good soaking of rain between Thursday and Friday evening. This is welcome news for a moisture starved region; 1 to 2 inches is in the cards for southern New England. The majority of rain falls before 8 AM Friday; this is when the best moisture is coincident with the strongest winds overhead. Friday morning the jet lifts north and the dry slot moves in from the south which will cut off the steady rain/snow, especially for areas further south. Speaking of snow, we continue to expect the possibility for some accumulating snow in the high elevations of the Berkshires overnight into Friday. The trend in guidance has continued to be northwest with the mid level low, keeping the subfreezing air in the low levels further north and decreasing chances for appreciable snow outside of the Berkshires. Surface temperatures will be marginal, but with 925 mb temps at or just below 0C, the dynamics of the system itself may cool the column enough to produce accumulating snow. Using 0C 925 mb temps as a proxy would indicate the high terrain of western MA sees the wet snow (except for the lighter snow later Friday as the cold air wraps around). There is some potential for banding somewhere in the vicinity of western MA where some elevated instability exists on the tip of the dry slot combined with deformation. Snow-to-liquid ratios will be very low given the marginal temperature profile, so snow will be heavy and wet; not as much of an issue now as it would be later in May since most trees still remain bare, but not a non-issue either. Given the previously mentioned thoughts, a Winter Storm Watch has been issued for the Berkshires for the potential of impactful snowfall. As for winds, it will be a gusty rainfall overnight for most locations thanks to the jet overhead, strongest over southeast MA and the waters. A Gale Watch is in effect for eastern waters for Friday. Fortunately astronomical tides are relatively low during this period, so coastal flooding issues aren't expected.

As the low occludes and becomes vertically stacked on Friday precipitation will become lighter and more scattered but may continue into Friday night as the low is slow to move out. It will be a breezy and rather chilly day with highs in the 40s.

Saturday and Sunday .

Drier on Saturday but remaining cool under cold NW flow behind the exiting low. Highs will be in the upper 40s and low 50s. Remaining breezy for the first half of the weekend as the pressure gradient is slow to relax. This all changes on Sunday which should be the pick of the weekend as westerly flow brings a warmer airmass; highs will once again approach 60 F with light winds to boot.

Monday and Tuesday .

Much warmer to start the week as flow becomes southwest ahead of our next mid level trough. 850 mb temps surge to +3 C allowing for highs into the 60s. Good deal of uncertainty with how the flow pattern evolves next week but the chance for unsettled weather increases toward mid week.

AVIATION /07Z WEDNESDAY THROUGH SUNDAY/.

Forecaster Confidence Levels.

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

06z Update .

Today . High Confidence. VFR conditions despite some mid level cloudiness and a few early morning showers; mainly near the eastern MA coast. Winds generally becoming ESE at 5 to 10 knots. We can not rule out a spot shower or two late in the day across western MA/northern CT.

Tonight . High Confidence. VFR conditions persist. The exception is near and especially west of the CT River where the threat for MVFR conditions along with showers will increase during the overnight hours. Light ESE winds.

Thursday . High Confidence. MVFR conditions and showers expand eastward from the CT River Valley to cover more of interior southern New England as Thursday wears along. Meanwhile, we expect eastern MA/RI to maintain generally VFR conditions with dry weather probably lingering through mid afternoon if not longer. E winds increasing to between 10 and 15 knots with some 20 to 25 knot gusts during the afternoon.

KBOS TAF . High Confidence in TAF.

KBDL TAF . High Confidence in TAF.

Outlook /Thursday Night through Sunday/ .

Thursday Night: Mainly IFR, with areas MVFR possible. Windy with local gusts up to 30 kt. SHRA.

Friday: Mainly MVFR, with areas IFR possible. Windy with gusts up to 35 kt. SHRA likely, SHSN.

Friday Night: MVFR/IFR conditions possible. Breezy. Chance SHRA, chance SHSN.

Saturday: Mainly VFR, with local IFR possible. Breezy.

Saturday Night through Sunday: Mainly VFR, with local MVFR possible.

MARINE.

Today and tonight . High Confidence. While pressure gradient will remain weak enough to keep easterly winds below small craft advisory levels; lingering easterly swell will keep marginal 5 foot small craft seas into tonight across the southern outer- waters.

Thursday . High Confidence. Low pressure developing south of the waters will result in increasing easterly winds. Easterly wind gusts of 20 to 30 knots are expected by mid afternoon with the strongest of those winds across the southern waters. Small craft headlines posted for most southern waters.

Outlook /Thursday Night through Sunday/ .

Thursday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 9 ft. Rain showers. Areas of visibility 1 to 3 nm.

Friday: Low risk for gale force winds with gusts up to 35 kt. Rough seas up to 12 ft. Chance of rain showers.

Friday Night: Low risk for Small Craft Advisory winds with local gusts up to 30 kt. Rough seas up to 12 ft. Chance of rain showers.

Saturday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 10 ft.

Saturday Night: Winds less than 25 kt. Local rough seas.

Sunday: Winds less than 25 kt. Areas of seas approaching 5 ft.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Winter Storm Watch from Thursday evening through Friday evening for MAZ002-008-009. RI . None. MARINE . Small Craft Advisory from 10 AM to 8 PM EDT Thursday for ANZ232>235-237. Gale Watch from late Thursday night through Friday afternoon for ANZ231-250-251-254. Small Craft Advisory until 2 PM EDT this afternoon for ANZ250. Small Craft Advisory until 8 PM EDT Thursday for ANZ254>256.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi65 min 47°F 47°F1017.4 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi35 min ENE 3.9 G 5.8 44°F 44°F1019.4 hPa (+1.0)41°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 28 mi91 min 5 ft
FOXR1 - 8454000 - Providence, RI 43 mi65 min S 5.1 G 7 47°F 46°F1018.2 hPa
PVDR1 44 mi65 min SE 6 G 8 47°F 1018.4 hPa42°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi65 min SSE 6 G 7 47°F 1018.4 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi65 min 46°F 51°F
FRXM3 47 mi65 min 46°F 40°F
IOSN3 - Isle of Shoals, NH 47 mi35 min E 11 G 11 44°F 1018.5 hPa (+0.5)42°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi65 min 46°F 49°F1017.8 hPa
BGXN3 - Great Bay Reserve, NH 49 mi110 min ENE 1 44°F 1019 hPa43°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi41 minESE 310.00 miMostly Cloudy46°F39°F77%1018.7 hPa
East Milton, MA11 mi44 minSSE 5 mi43°F37°F80%1018.9 hPa
Norwood, Norwood Memorial Airport, MA14 mi42 minN 010.00 miOvercast45°F38°F77%1018.4 hPa
Laurence G Hanscom Field Airport, MA14 mi44 minE 310.00 miLight Rain46°F38°F73%1019.5 hPa
Beverly, Beverly Municipal Airport, MA16 mi42 minN 010.00 miMostly Cloudy45°F40°F83%1018.2 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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NE14E14E15E12SE5SE4S3S3E4E6SE6SE4SE7SE5SE6S4SE4E3
1 day agoN11NE14NE17NE15E14NE15NE20
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NE18NE15NE15E12E10NE9E10NE4NW6N7N7N8NW7N8N7N9
2 days agoN13N14N12N12NE17NE15NE15NE16
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NE16NE15NE14NE13NE12NE10E9E9NE5NE7N6N7N7N8N8N5

Tide / Current Tables for Charles River Dam, Charles River, Massachusetts
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Charles River Dam
Click for Map
Wed -- 01:27 AM EDT     10.13 feet High Tide
Wed -- 06:04 AM EDT     Sunrise
Wed -- 07:26 AM EDT     Moonrise
Wed -- 07:42 AM EDT     0.10 feet Low Tide
Wed -- 01:55 PM EDT     9.46 feet High Tide
Wed -- 07:25 PM EDT     Sunset
Wed -- 07:53 PM EDT     0.91 feet Low Tide
Wed -- 10:04 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.8109.98.86.84.52.20.50.21.22.95.17.38.99.58.87.35.33.21.50.91.83.55.5

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Wed -- 01:07 AM EDT     -0.00 knots Slack
Wed -- 05:25 AM EDT     -1.24 knots Max Ebb
Wed -- 06:04 AM EDT     Sunrise
Wed -- 07:26 AM EDT     Moonrise
Wed -- 07:42 AM EDT     0.00 knots Slack
Wed -- 10:50 AM EDT     1.09 knots Max Flood
Wed -- 01:26 PM EDT     -0.00 knots Slack
Wed -- 05:37 PM EDT     -1.04 knots Max Ebb
Wed -- 07:24 PM EDT     Sunset
Wed -- 07:53 PM EDT     0.00 knots Slack
Wed -- 10:03 PM EDT     Moonset
Wed -- 10:36 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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0.70.1-0.5-0.8-1.1-1.2-1.2-0.60.30.911.10.80.3-0.3-0.7-0.9-1-1-0.70.10.91.11.1

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