Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Weymouth Town, MA

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:38AMSunset 7:01PM Thursday March 23, 2017 6:07 PM EDT (22:07 UTC) Moonrise 4:03AMMoonset 2:17PM Illumination 14% Phase: Waning Crescent; Moon at 26 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- 405 Pm Edt Thu Mar 23 2017
.small craft advisory in effect from Friday afternoon through Friday evening...
Tonight..NW winds 5 to 10 kt with gusts up to 20 kt...becoming W after midnight. Waves around 2 ft.
Fri..S winds 5 to 10 kt...becoming sw 10 to 15 kt in the afternoon. Gusts up to 30 kt. Waves around 2 ft. A chance of rain.
Fri night..SW winds 5 to 10 kt with gusts up to 25 kt. Waves around 2 ft. A chance of rain.
Sat..NW winds around 5 kt...becoming N in the afternoon. Waves 1 foot or less. A chance of rain.
Sat night..NE winds 5 to 10 kt. Waves 1 foot or less. A chance of rain.
Sun..E winds around 10 kt. Gusts up to 20 kt in the morning. Waves around 2 ft. A chance of rain.
Sun night..E winds 5 to 10 kt. Waves 1 foot or less. Rain likely.
Mon..E winds around 10 kt. Waves around 2 ft. Rain likely.
Mon night..NE winds around 10 kt. Waves 2 to 3 ft. Rain likely.
Tue..NE winds 5 to 10 kt. Waves around 2 ft.
Tue night..E winds 5 to 10 kt. Waves 1 foot or less... Except 2 to 4 ft at the outer harbor entrance. A chance of rain. 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 405 Pm Edt Thu Mar 23 2017
Synopsis for massachusetts and rhode island coastal waters.. High pres will move E of the waters Fri. A cold front will pass across the waters from the N on Sat...stay S of the waters on Sunday...the return as a warm front Mon. Low pres will cross the southern waters on Mon. Another are of low pres will cross the waters late Wed and move east of the waters on Thu. 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 Weymouth Town city, MA
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location: 42.24, -70.96     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 231950
afdbox
area forecast discussion
national weather service taunton ma
350 pm edt Thu mar 23 2017

Synopsis
High pressure along the eastern usa coastline will move offshore
later tonight bring windy and milder conditions Friday.

Unsettled weather this weekend, with potential for a variety of
precipitation types.

Near term /until 6 am Friday morning/
Tonight...

high pressure will move off the mid atlantic coast. Expect
winds to become light and variable for a time as the ridgeline
moves overhead. A light south-southwest flow is possible late at
night as the ridge moves offshore.

Some high thin clouds moving over ontario will reach our area
early tonight. But thicker mid level clouds should hold off
until after midnight, allowing a period of light winds and fair
skies. So we expect radiational cooling the first part of the
night, shutting down later tonight as the clouds thicken. Dew
points start in the single numbers below zero and climb into the
teens by late night. We favored going a couple of degrees below
guidance with a range from the high single numbers in the
interior to near 20 along the coastline. Most areas would be in
the teens.

Short term /6 am Friday morning through Friday night/
Friday...

high pressure offshore will provide a flow of milder air. Winds
above the surface will climb to 30-40 knots by midday. That will
provide a flow of moist air with precipitable water values
reaching near an inch by Friday evening. Weak overrunning
created by this southwest flow will create clouds and light
precipitation starting in the morning. Temperatures will be cold
enough at the start for snow, but quickly moderate to rain by
afternoon if not sooner. The transition period may feature some
sleet.

The best chance for this precipitation will be in northern and
western mass. But frozen amounts will be light, with any
snow/sleet accumulation less than an inch.

Have high confidence in the overall trend, but only moderate
confidence in the precipitation types.

The strong southwest low level jet will also provide the
momentum for gusty winds, especially during the afternoon when
mixing is greatest. It still appears the greatest risk for gusts
over 30 mph to be along the boston-providence corridor and
southeast from there.

Max temperatures should make a 5-10 degree rise from today, but
values in the mixed layer Friday are supportive of highs in the
low to mid 40s so still below march normals.

Friday night...

clouds and a southwest flow of milder air will keep
temperatures from falling too much, and most of that should be
in the evening. Temps may rise a little overnight. We maintained
a chance of showers in far northern mass, but low values for
pops.

Long term /Saturday through Thursday/
Highlights...

* above average temps on Saturday with a few showers
* low confidence next sun-tues with unsettled weather possible at
times with some rain, ice and/or snow possible
* moderating temperatures by mid-next week
pattern overview...

00z models and ensembles are in agreement with the general synoptic
pattern for the long term. Uncertainty increases in the extended do
to mesoscale and thermal issues. Split flow aloft with closed low
over the southern plains and northern stream across southern canada.

The initial closed 500 mb will slowly move into the midwest over the
weekend. This low deamplifies into an open wave as it comes towards
the northeast early next week. Due to the confluent flow aloft, high
pressure persists over northern new england keeping surface
temperatures cool, resulting in mixed precip at times for the
weekend into early next week. The models have slowed again compared
to 22.00z guidance but are similar in timing. Another open wave
moves through the flow during the mid-week with the GFS more
amplified versus the progressive ec. Still a lot of uncertainty with
this timeframe.

Details...

Saturday... Moderate confidence.

850 mb temps Saturday morning will be close to 8c but drop
through the day as cold front begins to slide southward. Surface
temperatures will reach into the mid 50s, cannot rule out a few
60s if the mid- level ridge continues to build and slows the
timing of the front. Along the front, there could be a few rain
showers but not expecting widespread rainfall as heights
continue to build overhead.

Saturday night into Sunday... Moderate confidence.

Cold front will pass through southern new england dropping surface
temps below freezing. The timing of the cold air drainage from the
high pressure over northern new england will determine if precip
type remains all rain, or if snow and/or mixed precip develops. Mid-
level ridging could keep a warm layer around 850 mb which would aid
in the mixed p-type. This is something to watch in the coming days.

For Sunday, cold front will stall somewhere between southern new
england and the mid-atlantic as high pressure begins to move
southeast into the gulf of maine. Depending on how close the high
pressure gets, we could see a dry Sunday or a few showers. One thing
to keep an eye on is the easterly flow, which could keep the low
level moist resulting in drizzle. Still a lot of uncertainty with
this time frame.

Sunday night Monday into Wednesday... Low confidence.

While guidance is in agreement synoptically, still a lot of details
to work out for this portion of the forecast. Biggest uncertainties
will be the placement of the upper level low and how quickly it will
diffuse early next week.

Right now, the stalled front looks to return back north as a warm
front late Sunday into Monday, as surface low pressure moves into
the great lakes. Although warmer air aloft should move easily back
into the region, the low-level cold air may be a little tougher to
dislodge this time due to the nearby surface high pressure. Believe
this is the timeframe where we will see the heaviest precip due to
passage of the open wave. Another open wave right behind this one
will push through the flow developing around shot at precip on
Tuesday.

As mentioned before, still a lot of uncertainty as to the thermal
profiles. Continue to believe that there could be a period where the
region could see a mixed bag of precip with the highest confidence
Sunday night into Monday and another shot Monday night into Tuesday
due to surface temps falling overnight. Still a lot of uncertainty
with this timeframe as thermal profiles will change. Will continue
the mentioning of snow, sleet, ice and/or rain for the forecast
until thermals come better in alignment.

Lastly, weak ridging in between waves may allow for temps to
moderate back to seasonable during the day light hours Monday
and Tuesday.

Aviation /19z Thursday through Tuesday/
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term /through Friday night/...

tonight...VFR. High confidence
nw winds with gusts 20-25 kt this evening, becoming light and
variable for a time tonight. Winds become light south to
southwest late tonight.

Friday and Friday night...VFR with some MVFR mainly north of
the mass pike. Moderate confidence.

Increasing and lowering clouds during the morning. Areas of MVFR
cigs/vsbys in light snow or sleet, with best chance along or
north of boston and the mass pike. All frozen precip should
change to rain during late morning/early afternoon. Southwest
winds will gust 25-30 knots during the day, highest along the
coast and in higher terrain. Winds diminish Friday night.

Kbos taf... High confidence in taf.

Kbdl taf... High confidence in taf.

Outlook /Saturday through Tuesday/...

Saturday into Sunday... Moderate confidence. A period or two of
showers along with some MVFR CIGS are possible at times as cold
front sags southward over the region. Could see a period of mixed
precip overnight.

Sunday into Monday... Low confidence. Showery weather to start with
possible MVFR cigs. Precip chances increase overnight into Monday
which could result in mixed precip.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term /through Friday night/...

tonight... High confidence.

Diminishing NW winds becoming light SW overnight. Seas near 5
feet on the outer waters east of massachusetts early, but
subsiding during the night. Seas elsewhere less than 5 feet. A
small craft advisory lingers on those eastern outer waters for a
few more hours until seas subside.

Friday... Moderate confidence.

High pressure moves well offshore, bringing southwest winds to
the waters. Potential for wind gusts 25-30 knots. This will
build seas with 5 foot heights on many of the waters by the
afternoon. Patchy light rain may bring brief visibility
restrictions. Small craft advisories are being issued for most
waters. An advisory for the eastern outer waters for Friday will
be issued once we move clear of the existing headline.

Friday night... Moderate confidence.

Southwest winds 25 to 30 knots may become west toward morning.

Seas of 5-7 feet will linger through the night on the outer
waters and all southwest-exposed waters such as ri sound. Small
craft advisory will lower on boston harbor and narragansett bay,
but linger on the remaining waters.

Outlook /Saturday through Tuesday/...

Saturday... High confidence. Increased pressure gradient with
approaching systems may result in gales across the eastern
waters. Cold frontal passage on Saturday may bring some showery
weather for the waters.

Sunday... Moderate confidence. Cold front will be south of the waters
as surface high pressure moves northeast of the region. Conditions
should remain below SCA but if the front gets closer than seas and
winds may be a bit stronger.

Monday... Low confidence. Approaching upper level system and passing
warm front will increase precip as well as wind and seas of the
waters. SCA may be needed.

Box watches/warnings/advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from 10 am Friday to 6 am edt Saturday
for anz232>235-237-255-256.

Small craft advisory from noon to 8 pm edt Friday for anz230.

Small craft advisory from 10 am Friday to 3 am edt Saturday
for anz231-251.

Small craft advisory from 10 am to 10 pm edt Friday for anz236.

Small craft advisory until 2 am edt Friday for anz250-254.

Synopsis... Wtb/dunten
near term... Wtb/dunten
short term... Wtb
long term... Dunten
aviation... Wtb/dunten
marine... Wtb/dunten


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 9 mi50 min 37°F 37°F1030 hPa
44013 - BOSTON 16 NM East of Boston, MA 18 mi78 min WNW 18 G 21 36°F 40°F3 ft1029.2 hPa (-0.6)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 29 mi124 min NW 18 G 19 35°F 39°F3 ft1028.4 hPa
FOXR1 - 8454000 - Providence, RI 38 mi56 min NNW 11 G 17 39°F 39°F1029.8 hPa
FRVM3 - 8447386 - Fall River, MA 39 mi56 min 38°F 38°F1031 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 39 mi50 min NW 16 G 21 40°F 1031.1 hPa
PVDR1 39 mi50 min WNW 11 G 16 40°F 1030.3 hPa-1°F
FRXM3 39 mi50 min 38°F 5°F
CPTR1 - 8452944 - Conimicut Light, RI 42 mi50 min WNW 14 G 23 37°F 39°F1030.6 hPa
44090 43 mi34 min 36°F3 ft
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 46 mi56 min N 6 G 11 40°F 1031.4 hPa
NAXR1 - Narragansett Bay Reserve, RI 46 mi83 min NNW 6 41°F 1031 hPa2°F

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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N17
G26
N16
G25
N14
G27
N22
G33
N19
G25
NE14
G25
NE12
G18
N15
G20
N13
G19
N9
G17
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G14
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N7
G11
N4
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G22
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G20
NE11
G17
N11
G17
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G18
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N7
G17
N12
G19
1 day
ago
NW10
G13
NW4
G7
NW4
W5
G8
NW7
NW7
G11
N6
W3
SW1
--
N7
G10
N7
G13
NW10
G17
NW9
G14
NW12
G19
NW24
G32
N18
G30
NW19
G29
NW26
G33
N18
G28
N15
G33
N21
G33
N19
G30
NE15
G25
2 days
ago
NE8
NE6
NE2
N5
W2
NW8
N4
G7
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G7
N6
G9
N7
G10
N6
N6
G11
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G6
NW1
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G6
NE4
NE2
W3
G6
S11
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G11
W7
G10
NW10
G15
NW15

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
East Milton, MA8 mi74 minWNW 16 G 32 mi34°F3°F27%1030.7 hPa
Boston, Logan International Airport, MA10 mi74 minW 18 G 2310.00 miA Few Clouds and Breezy37°F1°F22%1030.2 hPa
Norwood, Norwood Memorial Airport, MA12 mi75 minWNW 12 G 2110.00 miFair39°F0°F18%1030.3 hPa
Marshfield Airport, MA18 mi73 minVar 5 G 1610.00 miFair39°F0°F18%1029.8 hPa
Taunton, Taunton Municipal Airport, MA24 mi76 minNW 11 G 1810.00 miFair39°F-2°F17%1030.1 hPa
Bedford, Hanscom Field, MA24 mi72 minNW 13 G 2310.00 miFair37°F0°F20%1031.4 hPa
Beverly, Beverly Municipal Airport, MA24 mi75 minWNW 16 G 2110.00 miFair37°F1°F22%1029.1 hPa

Wind History from BOS (wind in knots)
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Last 24hrNW22
G32
NW23
G30
NW16
G33
NW20
G30
NW23
G29
NW23
G31
NW18
G24
NW17
G24
NW12NW15
G23
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NW9NW11NW17
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NW12W15
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W12NW10
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W14NW15
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G23
1 day agoSW8
G16
W13
G19
W8W12W11
G21
W10
G19
W10W6SW5W15
G22
W10
G18
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G21
W13W13
G21
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G29
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G27
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G25
NW20
G30
NW19
G29
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G33
W22
G33
NW27
G36
NW24
G41
NW20
G32
2 days agoNW5E4SE4E35NW10NW9NW9NW6NW9NW8NW7W6W6NW6W74E10E7SE6SE9SE6SW4W7

Tide / Current Tables for Weymouth Fore River Bridge, Massachusetts
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Weymouth Fore River Bridge
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Thu -- 02:01 AM EDT     1.84 feet Low Tide
Thu -- 04:03 AM EDT     Moonrise
Thu -- 06:41 AM EDT     Sunrise
Thu -- 08:20 AM EDT     9.11 feet High Tide
Thu -- 02:17 PM EDT     Moonset
Thu -- 02:40 PM EDT     1.09 feet Low Tide
Thu -- 06:59 PM EDT     Sunset
Thu -- 09:00 PM EDT     8.53 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.92.51.82.43.656.68.29.18.97.96.44.62.81.41.223.24.86.688.58.16.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Thu -- 12:14 AM EDT     -0.92 knots Max Ebb
Thu -- 02:05 AM EDT     0.00 knots Slack
Thu -- 04:03 AM EDT     Moonrise
Thu -- 05:22 AM EDT     0.93 knots Max Flood
Thu -- 06:41 AM EDT     Sunrise
Thu -- 07:48 AM EDT     -0.00 knots Slack
Thu -- 12:35 PM EDT     -1.09 knots Max Ebb
Thu -- 02:17 PM EDT     Moonset
Thu -- 02:36 PM EDT     0.00 knots Slack
Thu -- 05:57 PM EDT     1.01 knots Max Flood
Thu -- 06:59 PM EDT     Sunset
Thu -- 08:27 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-0.8-0.10.70.90.90.90.5-0.1-0.5-0.8-0.9-1.1-1.1-0.50.30.9110.80.3-0.2-0.6-0.8

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Boston, MA (18,4,5,8)
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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.