Wednesday, November20, 2019 L-36.com


Marine Weather and Tides
Chelsea, MA

Version 3.4
NOTICE
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.
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

Sunrise 6:39AMSunset 4:20PM Wednesday November 20, 2019 5:20 PM EST (22:20 UTC) Moonrise 12:13AMMoonset 2:22PM Illumination 37% Phase: Third Quarter Moon; Moon at 23 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- 359 Pm Est Wed Nov 20 2019
Tonight..NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. Patchy fog this evening. A chance of showers this evening with vsby 1 to 3 nm.
Thu..NW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Waves around 2 ft.
Thu night..SW winds 5 to 10 kt. Gusts up to 20 kt after midnight. Waves around 2 ft.
Fri..SW winds 10 to 15 kt with gusts up to 25 kt, becoming W 20 to 25 kt with gusts up to 35 kt in the afternoon. Waves around 2 ft.
Fri night and Sat..W winds 20 to 25 kt with gusts up to 35 kt. Waves around 2 ft.
Sat night..SW winds 5 to 10 kt. Waves 1 foot or less. A chance of rain. Vsby 1 to 3 nm.
Sun..NE winds 5 to 10 kt. Waves around 2 ft. Rain likely.
Sun night..NW winds around 10 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers.
Mon and Mon night..W winds 5 to 10 kt. Waves around 2 ft, then 1 foot or less. 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 359 Pm Est Wed Nov 20 2019
Synopsis for massachusetts and rhode island coastal waters.. High pressure builds across the waters Thursday behind a departing . Ocean storm. A cold front moves across the waters late Friday. Another weather system passes to our south over the weekend, bringing possible gales Saturday into Sunday. 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 Chelsea, MA
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location: 42.37, -71.06     debug


Area Discussion for - Boston, MA
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ftp://tgftp.nws.noaa.gov/data/raw/fx/fxus61.kbox.afd.box.txt <- there really should be an address herer AEFXUS61 KBOX 202038AFDBOX Area Forecast DiscussionNational Weather Service Boston Norton MA338 PM EST Wed Nov 20 2019

SYNOPSIS Low pressure exits bringing rain showers to and end from west to east this evening. High pressure then builds in from the west Thu yielding dry conditions and seasonable temperatures. Mild and gusty Friday as a cold front swings through NewEngland. Colder air moves in behind the front, with dry weatherfrom Friday afternoon through Saturday. Low pressure moving outof the Southern Appalachians will bring rain and snow to much ofour area Saturday night and Sunday. High pressure brings drierweather Sunday night through Tuesday. A cold front may bringshowers Wednesday afternoon and night.

NEAR TERM UNTIL 6 AM THURSDAY MORNING Looking at the late afternoon into overnight period we'll see adrastically improving weather pattern. This improvement comesthanks to the exiting of the offshore surface low and mid leveldisturbance. The mid level low center is currently spinning justover Cape Cod as visible on water vapor satellite imagery. Aninflux of mid and upper level moisture around this circulationhas increased the areal coverage of rain showers this afternoon,but this will begin to exit from west to east this evening. Currently expecting the last of the showers to exit the eastcoast by midnight. Beyond that we begin to make the transitionto drier weather as surface high pressure and mid level ridgingmove in. Drier air returns first at the mid upper levels,working down and providing for clearing skies in the earlymorning hours of Thursday. Potential for some radiationalcooling, especially out west, but will be contingent on howquickly those clouds can clear out and if winds calm enough. Winds will be coming down through the evening as the gradientslackens. Low temperatures are likely to drop into the 20s andlow 30s inland, with upper 30s along the immediate coast.

SHORT TERM 6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT Rising heights, building high pressure, and decreasing winds will be the story of the day. Skies will be sunny under a neutral to slightly WAA (moreso WAA later in the day) regime and this should support temperatures well into the upper 40s. This would be closer to (but still slightly cooler than) normal for late November. After many days of gloomy wet weather Thursday will bea nice change of pace. By Thursday evening into Thursday night return flow commences onthe downstream side of the next shortwave. WAA as the warm frontlifts north and a plume of moisture moves into the region. Alongwith the moisture a LLJ associated with the low over the GreatLakes reaches into SNE. However, the best forcing and bettermoisutre resides to our north, so any rain high elevation snowshowers should be spotty. Increasing clouds and warmer southerlyflow will keep temperatures warmer than previous nights, in the30s across the board.

LONG TERM FRIDAY THROUGH WEDNESDAY Big Picture...

Split flow in place with northern and southern streams over thenation. This resolves to a single jet late in the weekend through midweek next. Shortwave in the northern stream moves across New England Friday. Closed low that initialized over the Desert Southwest this morning will move to the Ohio Valley Saturday and cross New England as a shortwave Sunday. A third system crosses the Great Lakes Wednesday night.

Operational models show good agreement through Saturday, then show differences with the Sunday shortwave, and then show differences in timing and placement with the Wednesday upper system. Forecast confidence is high through Saturday morning, then diminishes to between low and moderate Sunday through next Wednesday.

Daily Concerns...

Friday... Strong low-level winds associated with the Friday northern shortwave. Winds forecast at 30-40 kt at 950 mb and 50 kt at 850 mb. Much of the former is withing the mixed layer. Expect gusty winds in the warm advection leading the front, and a better chance of strong gusts in the cold advection trailing the front. The cloud layer is forecast to reach up through 700 mb and shows limited lift. While not impressive, it should be enough for scattered showers along ahead of the cold front. The mixed layer is forecast to reach near 900 mb, and temperatures in that layer support MAX sfc temps in the 50s... possibly near 60 in spots. Continued cold advection wind gusts of 30-40 kt supported Friday night. Temperatures fall to 25-35.

Saturday...

Shortwave ridge builds over the region, and should provide sufficient subsidence for a dry day. Increasing high level moisture over CT and Western MA during the afternoon suggests increasing cirrus sky cover at that time, but dry weather at thesurface. Mixed layer reaches to about 950 mb, with temperaturesthat support surface MAX temps in the 40s.

Saturday night through Wednesday...

As noted above, confidence trends lower during this period. Lowpressure moves up from the Appalachians spreading precipitationinto Southern New England. Temperature profiles on BUFKIT show rain over most areas including Hartford-Springfield, with snowor mixed pcpn over higher elevation areas, including Worcester. Meanwhile the combined model data shows a little more cold air,with a period of snow ice in Western Central MA and extreme NrnCT RI. We have used the latter, which gives us less than an inchof snow and less than 0.1 inch ice potential. As usual, changes in the storm track could change this... either for the milder or the colder... so this will continue to be monitored. The low center passes closely to Cape Cod Sunday afternoon with rain tapering off Sunday evening.

High pressure brings dry weather Monday and Tuesday. Increasingsouth-southwest flow Wednesday will bring milder temps. Cold front approaches for Wednesday night, although timing on this system remains variable and will be monitored.

AVIATION 21Z WEDNESDAY THROUGH MONDAY Forecaster Confidence Levels...

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

Short Term through Thursday Night ... Moderate confidence.

18z update...

This afternoon...

A mix of IFR MVFR CIGS in light to moderate rain. Could see somewet snow mix in at at ORH. Later this aftn early evening precipshould begin to focus more into eastern MA TAF sites. NW winds increasing to 10-15 kts gusts to 20-25 kts for Cape Cod airports.

Tonight...

Conditions improve from west to east, with improvement in ceilings and less precipitation coverage. Initial MVFR ceilings VFR- MVFR visbys eastern sections should transition toVFR. NW winds to continue around 7-15 kts, with gusts on the Cape starting to subside to 20 kt levels.

Thursday...

VFR under high pressure. Gradient slackens into Thursday withdecreasing N winds towards light variable (tending W-SW late).

Thursday Night... VFR. Light SW winds. KBOS TAF... Moderate confidence in TAF.

KBDL TAF... High confidence in TAF. Outlook Friday through Monday ...

Friday: MainlyVFR, with areas MVFR possible early. Windy with gusts up to 35 kt. Slight chance SHRA.

Friday Night:VFR. Windy with gusts up to 35 kt. Saturday:VFR. Windy with local gusts up to 30 kt. Saturday Night: MainlyVFR, with areas IFR possible. Chance RA,with a chance SN or FZRA inland. Sunday: MainlyVFR, with local IFR possible. Breezy. Chance RA,with a chance FZRA or SN in Northern and Western MA early. Sunday Night: IFR early, then trending toVFR overnight. Breezy.

Monday:VFR.

MARINE Short Term through Thursday Night ... Moderate confidence.

Tonight: N Winds remain 15-25 kts gusts to 25-30 kts. Building seas eastern offshore waters to 6-9 ft, 3-6 ft in coastal watersin eastern MA Cape Cod Bay. Southern waters should see seas 4-6ft.

Thursday: Decreasing N winds to around 10 kts, gusts to 15-25kts by afternoon. Seas 4-7 ft outer offshore waters.

Thursday Night: Light SW winds early will increase through thenight, gusting to 25-30kts by daybreak. Seas becoming 3-5 ft. Outlook Friday through Monday ...

Friday: Low risk for gale force winds with gusts up to 35 kt. Areas of rough seas. Slight chance of rain showers. Friday Night: Moderate risk for gale force winds with gusts upto 35 kt. Rough seas up to 11 ft. Saturday: Low risk for Small Craft Advisory winds with gusts upto 30 kt. Areas of rough seas. Saturday Night: Winds less than 25 kt. Seas locally approaching5 ft. Chance of rain. Sunday: Winds less than 25 kt. Local rough seas. Chance ofrain. Sunday Night: Winds less than 25 kt. Areas of rough seas. Slight chance of rain. Monday: Winds less than 25 kt. Seas up to 5 ft.

BOX WATCHES WARNINGS ADVISORIES CT... None. MA... None. RI... None. MARINE... Small Craft Advisory until 4 AM EST Thursday for ANZ232. Small Craft Advisory until 7 AM EST Thursday for ANZ231. Small Craft Advisory until 4 PM EST Thursday for ANZ250-251- 254. Small Craft Advisory until noon EST Thursday for ANZ255-256.

SYNOPSIS... WTB BWNEAR TERM... BWSHORT TERM... BWLONG TERM... WTBAVIATION... WTB BWMARINE... WTB BW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi50 min 40°F 43°F1012.3 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi30 min N 16 G 19 40°F 51°F4 ft1012.1 hPa (+1.1)37°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 28 mi76 min N 18 G 21 41°F 50°F4 ft1011.5 hPa
FOXR1 - 8454000 - Providence, RI 43 mi50 min N 7 G 9.9 41°F 48°F1013.3 hPa
PVDR1 44 mi50 min N 5.1 G 8 41°F 1013.4 hPa38°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi50 min N 5.1 G 6 40°F 1013.2 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi50 min 39°F 48°F1013.4 hPa
FRXM3 47 mi56 min 40°F 37°F
IOSN3 - Isle of Shoals, NH 47 mi80 min N 14 G 17 38°F 1012.4 hPa (+0.4)37°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi50 min N 8.9 G 9.9 41°F 48°F
BGXN3 - Great Bay Reserve, NH 49 mi95 min NW 1 38°F 1013 hPa37°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi26 minN 98.00 miLight Rain40°F35°F83%1013.6 hPa
East Milton, MA11 mi29 minN 7 mi35°F35°F100%1013.9 hPa
Norwood, Norwood Memorial Airport, MA14 mi27 minNNW 410.00 miLight Rain41°F35°F79%1013.5 hPa
Laurence G Hanscom Field Airport, MA14 mi29 minNNW 76.00 miLight Rain Fog/Mist38°F34°F86%1015 hPa
Beverly, Beverly Municipal Airport, MA16 mi27 minN 69.00 miLight Rain38°F35°F89%1013 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hrN6N5N6N7N7N6N7N6NW8N9N9N11N9N11N9N10N9N9N10N8NW9N7N10N9
1 day agoN11N12N11N10N9N10N8N4NW5NW5NW5CalmN3NE3NE3CalmSE3SE4SE3E3CalmNE4N6N5
2 days agoE15E17E15E16NE14NE13N10N10N9N11N15N14N13N12N13N13N15
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Tide / Current Tables for Charles River Dam, Charles River, Massachusetts
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Charles River Dam
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Wed -- 05:04 AM EST     9.36 feet High Tide
Wed -- 06:40 AM EST     Sunrise
Wed -- 11:08 AM EST     1.09 feet Low Tide
Wed -- 01:22 PM EST     Moonset
Wed -- 04:18 PM EST     Sunset
Wed -- 05:20 PM EST     10.03 feet High Tide
Wed -- 11:44 PM EST     0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.23578.79.48.97.55.63.721.11.63.25.27.29109.88.56.54.32.10.5

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Wed -- 12:47 AM EST     1.07 knots Max Flood
Wed -- 04:27 AM EST     -0.00 knots Slack
Wed -- 06:40 AM EST     Sunrise
Wed -- 07:52 AM EST     -0.88 knots Max Ebb
Wed -- 11:11 AM EST     0.00 knots Slack
Wed -- 01:13 PM EST     1.05 knots Max Flood
Wed -- 01:22 PM EST     Moonset
Wed -- 04:18 PM EST     Sunset
Wed -- 04:50 PM EST     -0.00 knots Slack
Wed -- 08:39 PM EST     -1.00 knots Max Ebb
Wed -- 11:42 PM EST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.110.80.3-0.3-0.7-0.8-0.9-0.9-0.7-0.20.7110.90.5-0.1-0.6-0.9-1-1-1-0.6

Weather Map
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Wind Forecast for Boston, MA (17,4,5,8)
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Ground Weather Radar Station Boston, MA
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