Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Winthrop Town, MA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 5:44AMSunset 7:38PM Wednesday April 25, 2018 7:34 PM EDT (23:34 UTC) Moonrise 2:56PMMoonset 3:47AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 716 Pm Edt Wed Apr 25 2018
Tonight..SE winds 10 to 15 kt with gusts up to 25 kt, diminishing to 5 to 10 kt after midnight. Waves 2 to 4 ft. Areas of fog. Rain this evening. Showers likely after midnight. Vsby 1 nm or less.
Thu..SW winds 5 to 10 kt, becoming W 10 to 15 kt with gusts up to 25 kt in the afternoon. Waves around 2 ft. Areas of fog. A chance of showers. Vsby 1 nm or less.
Thu night..W winds 10 to 15 kt with gusts up to 25 kt, diminishing to 5 to 10 kt after midnight. Waves around 2 ft.
Fri..SW winds around 5 kt, becoming se in the afternoon. Waves 1 foot or less. Showers likely.
Fri night..S winds 5 to 10 kt. Waves 1 foot or less. Showers likely.
Sat..SW winds 5 to 10 kt. Waves around 2 ft.
Sat night..SW winds 5 to 10 kt. Waves around 2 ft.
Sun..W winds 5 to 10 kt. Waves around 2 ft.
Sun night..W winds 5 to 10 kt. Waves around 2 ft.
Mon..NW winds 5 to 10 kt. Waves around 2 ft.
Mon night..W winds 5 to 10 kt. Waves 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 716 Pm Edt Wed Apr 25 2018
Synopsis for massachusetts and rhode island coastal waters.. Low pressure lifts across new england tonight. Another low will approach from the southwest on Friday resulting in showers across the waters Friday evening, before it lifts over new england Friday night. A cold front will cross the waters late Saturday with a few showers possible. Dry high pressure will build in from the west Saturday night and 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 Winthrop Town, MA
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location: 42.37, -70.98     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 252311
afdbox
area forecast discussion
national weather service boston norton ma
711 pm edt Wed apr 25 2018

Synopsis
Low pressure will push northeast from the mid atlantic coast,
crossing the region tonight. This will bring locally heavy
downpours may result in some brief poor drainage street flooding
and possibly an isolated thunderstorm or two. Seasonably mild
temperatures will follow for the remainder of the week with
mainly dry weather other than a period of showers Friday. A cool
down will occur Saturday night and Sunday, but this will be
short lived as unseasonably warm temperatures are in store for
the region by the middle of next week.

Near term until 6 am Thursday morning
7 pm update...

convective showers with locally heavy rain continue to lift
north across eastern half of new england. Activity is located
along the nose of the low level jet. In addition, still can't
rule out an isold t-storm as elevated instability is present.

As the axis of the low level jet shifts to the east main focus
for heavy rain will gradually shift offshore after midnight.

Main impact will be localized nuisance poor drainage street
flooding in areas of heavy rain. Gusty southerly winds SE new
eng this evening will diminish late this evening.

Other concern for tonight is dense fog as some mid level drying
moves in tonight while low levels remain saturated. Low vsbys
have developed over southern ri where we will issue a dense fog
advisory through tonight. Plenty of low level moisture present
and advisory may need to be expanded along the rest of the south
coast.

Previous discussion...

surface low still in the vicinity with digging upper level
trough approaching from the west. The evening will start off
with a dry weather trend as mid-level dry slot pushes through.

Still quite saturated as the low levels so fog and drizzle may
be an issue. As the upper level low rotates through, the mid and
upper levels begin to saturated and there could be a
redevelopment in strong showers moving through sne. Best timing
is between 3-9z as strong mid-level omega pushes through. The
east coast of ma has the best shot of seeing the strong
downpours. Still cannot rule out the thunder potential as rap
data has several hundred julep of MUCAPE and showalters dropping
below 0c. Heavy rainfall will be the main threat as well as
gusty winds, especially along the passing cold front.

Ahead of the passage of the front, patchy dense fog is possible
across the region. This is due to the saturated low level moisture
as well as weak pressure gradient ahead of the fropa. Both the hrrr-
tl and the narre indicated high probs that visibilities will drop
at or below a mile, with some potential for less than 1 4 mi.

Locations along long island are starting to drop below 1 2 mile, but
still see coastal above 1-2 miles. So confidence isn't quite high to
issue a dense fog adv at this time.

Short term 6 am Thursday morning through 6 pm Thursday
Thursday...

upper level low will begin to pivot out of the region during the day
on Thursday. Still some lingering moisture in the mid-levels with
steep lapse rates which will yield to sct showers in the morning.

Deep layer moisture will push northward towards maine resulting in
low precip chances by the afternoon hours. Still expect sct to
broken clouds but overall trend will be dry by sunset.

Gusty wnw flow expected along as the mid level shortwave passes
through. Steep lapse rates and downsloping flow will result in good
mixing to near 850mb. Expect wind gusts to near 25-30 mph by the
afternoon as highs reach into the mid to upper 60s. Overall a
pleasant spring day.

Long term Thursday night through Wednesday
Highlights...

* a period of showers Fri afternoon evening
* scattered showers sat, mainly interior
* dry and cooler Sun then seasonably mild mon
* dry with a significant warming trend Tue wed
Friday...

southern stream shortwave will be lifting northward into sne during
the afternoon evening. Shortwave is deamplifying but modest low
level jet and pwat plume will bring a period of showers to much of
sne, especially afternoon into early evening. There may be a focus
for brief heavy showers and an isold t-storm across ri and SE ma
where some elevated instability is present along the nose of the low
level jet. Highs will range from the upper 50s to lower 60s.

Saturday...

next mid level shortwave and cold front approaches from the west.

This will lead to an increasing risk of sct showers, mainly across
central western ma and northern ct during the afternoon. Otherwise,
expect pt-mosunny skies in the coastal plain with increasing
afternoon clouds in western new eng. There is a low risk a few
showers could move into eastern new eng Sat night as the front moves
through. With pre-frontal SW flow, milder temps expected sat,
reaching mid 60s to near 70, except cooler along the south coast.

Sunday...

cooler post-frontal airmass as deep trough settles over the
northeast and 850 mb temps cool to around -4c. Temps will remain
mostly in the 50s, with a few locations topping out near 60 in ri
and eastern ma. Chilly night Sun night with lows in the 30s but
close to 30 across the typical colder locations. Frost headlines
may be needed where growing season has started, with greatest risk
across northern ct.

Monday through Wednesday...

a pattern change will occur next week as deep trough lifts out mon
and is replaced by building heights and mid level ridging through
the middle of the week. Monday will be the transition day with
seasonably mild temps after a cold start to the day. Then warming
mid level temps will result in temps reaching into the 70s Tue with
potential for some lower 80s wed. But SW flow will result in cooler
temps along the south coast.

Aviation 00z Thursday through Monday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ... Moderate to high confidence.

Tonight... Ifr-lifr conditions. Showers with locally heavy rain
through this evening and can't rule out an isold t-storm. Low
cigs and areas of fog will linger across the terminals much of
the night.

Thursday... Improving conditions toVFR with mix of MVFR north of
the pike during the day. Gusty westerly winds between 20-30 kts
by the afternoon.

Kbos terminal... Moderate confidence in taf. Ifr conditions in
rain and lower ceilings through the evening push. Low risk for
tsra from 21z-04z.

Kbdl terminal... Moderate confidence in taf. Ifr conditions in
rain and lower ceilings through the evening push. Dense fog is
possible during the overnight.

Outlook Thursday night through Monday ... Moderate to high
Thursday night:VFR. Breezy.

Friday: MVFR ifr conditions possible. Breezy. Shra likely.

Friday night: MVFR ifr conditions possible. Breezy. Chance
shra.

Saturday: mainlyVFR, with local MVFR possible. Slight chance
shra.

Saturday night: mainlyVFR, with local MVFR possible.

Sunday through Sunday night:VFR. Breezy.

Monday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ...

tonight... Moderate confidence. Small craft advisories for all
waters except boston harbor. Expect e-se winds gusting up to 30
kt. Low risk for a few 35 knot gusts early in the evening across
the southeast waters. Rough seas up to 10 to 12 ft. Rain
showers, heavy at times along with areas of fog and isolated
thunderstorms. Visibility locally below 1 nm at times across
the southern waters tonight.

Thursday... Moderate to high confidence.

Small craft conditions continue as winds shift to w, though
winds diminish during the day. May see gusts up to 25-30 kt
through midday. Seas remain at 5 feet or greater through the
day across the open waters as well as the south bays and sounds.

Outlook Thursday night through Monday ... Moderate to high
Thursday night: winds less than 25 kt. Rough seas up to 9 ft.

Friday: winds less than 25 kt. Seas up to 5 ft. Rain showers
likely.

Friday night: winds less than 25 kt. Areas of rough seas.

Chance of rain showers.

Saturday through Sunday night: winds less than 25 kt. Seas up
to 5 ft.

Monday: winds less than 25 kt. Areas of seas approaching 5 ft.

Equipment
The NOAA weather radio transmitter serving providence is out of
service due to phone line problems. The phone company has
prioritized the issues and is working to get the weather
broadcast back on the air as soon as possible. The transmitter
serving hyannis is back in service.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... Dense fog advisory until 8 am edt Thursday for riz006>008.

Marine... Small craft advisory until 8 pm edt Thursday for anz232>234-
251.

Small craft advisory until 3 am edt Thursday for anz231.

Small craft advisory until 11 am edt Thursday for anz236.

Small craft advisory until 8 am edt Friday for anz235-237-250-
254>256.

Synopsis... Kjc dunten
near term... Kjc dunten
short term... Dunten
long term... Kjc
aviation... Kjc dunten
marine... Kjc dunten
equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 4 mi46 min 51°F 1007.2 hPa
44013 - BOSTON 16 NM East of Boston, MA 18 mi44 min ESE 18 G 21 48°F 45°F5 ft1008 hPa (-3.9)48°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 24 mi90 min 48°F 43°F5 ft1007.9 hPa
FOXR1 - 8454000 - Providence, RI 45 mi52 min SSW 9.9 G 18 54°F 52°F1007.2 hPa
IOSN3 - Isle of Shoals, NH 45 mi34 min ESE 27 G 29 51°F 1008.1 hPa (-3.9)51°F
PVDR1 46 mi46 min S 14 G 17 54°F 1007.7 hPa54°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 46 mi44 min SE 23 G 29 48°F 4 ft1008.5 hPa (-4.6)47°F
FRVM3 - 8447386 - Fall River, MA 47 mi52 min 55°F 47°F1007.8 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi46 min SSE 18 G 26 56°F 1007.1 hPa
FRXM3 48 mi46 min 55°F 54°F
BGXN3 - Great Bay Reserve, NH 48 mi109 min E 6 49°F 1006 hPa49°F
CPTR1 - 8452944 - Conimicut Light, RI 49 mi46 min S 8.9 G 14 51°F 51°F1007.4 hPa

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA3 mi40 minE 62.00 miLight Rain Fog/Mist51°F51°F100%1007.9 hPa
East Milton, MA13 mi38 minSSE 15 G 19 mi54°F54°F100%1008.2 hPa
Beverly, Beverly Municipal Airport, MA15 mi41 minSE 132.50 miLight Rain Fog/Mist50°F48°F96%1008 hPa
Norwood, Norwood Memorial Airport, MA16 mi41 minSSE 51.75 miFog/Mist58°F55°F93%1007.5 hPa
Bedford, Hanscom Field, MA18 mi38 minE 62.00 miLight Rain Fog/Mist53°F52°F96%1008.8 hPa

Wind History from BOS (wind in knots)
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Last 24hrS13S11S14S10S10S5S4E5E6NE6E5NE4NE5E7E7E10E11E12E13E14E14E14E13E6
1 day agoS11S11S11S9SW11SW11SW7SW9SW6SW7SW7SW7SW9SW10SW9W11SW11S11S15S11
G20
S15S18S15S16
2 days agoE5S3CalmN3N6N7N8N6N4NW5NW5NW7NW4N3SE6SE9SE10E11E11E13E14E13E12SE11

Tide / Current Tables for Belle Isle Inlet entrance, Boston Harbor, Massachusetts
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Belle Isle Inlet entrance
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Wed -- 01:59 AM EDT     0.78 feet Low Tide
Wed -- 03:47 AM EDT     Moonset
Wed -- 05:47 AM EDT     Sunrise
Wed -- 08:20 AM EDT     10.15 feet High Tide
Wed -- 02:37 PM EDT     0.00 feet Low Tide
Wed -- 02:56 PM EDT     Moonrise
Wed -- 07:36 PM EDT     Sunset
Wed -- 09:02 PM EDT     9.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.51.50.81.42.94.97.19.110.19.98.76.84.420.30.11.12.85.17.59.29.99.48

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Wed -- 01:40 AM EDT     0.00 knots Slack
Wed -- 03:47 AM EDT     Moonset
Wed -- 05:03 AM EDT     0.96 knots Max Flood
Wed -- 05:47 AM EDT     Sunrise
Wed -- 07:30 AM EDT     -0.00 knots Slack
Wed -- 12:10 PM EDT     -1.16 knots Max Ebb
Wed -- 02:13 PM EDT     0.00 knots Slack
Wed -- 02:56 PM EDT     Moonrise
Wed -- 05:38 PM EDT     1.06 knots Max Flood
Wed -- 07:36 PM EDT     Sunset
Wed -- 08:18 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1-0.60.30.80.910.80.3-0.2-0.6-0.8-1-1.2-1-0.20.60.9110.70.1-0.3-0.6-0.9

Weather Map and Satellite Images
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wmap_A
GOES 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 (19,4,5,8)
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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.