Thursday, April26, 2018 L-36.com


Marine Weather and Tides
Groton, 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 5:46AMSunset 7:43PM Thursday April 26, 2018 2:03 AM EDT (06:03 UTC) Moonrise 4:07PMMoonset 4:23AM Illumination 83% 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- 116 Am Edt Thu Apr 26 2018
Rest of tonight..SE winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. Areas of fog. Showers likely with isolated tstms. Vsby 1 nm or less.
Thu..SW winds 5 to 10 kt, becoming W 10 to 15 kt with gusts up to 20 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 20 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. 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 Thu Apr 26 2018
Synopsis for massachusetts and rhode island coastal waters.. Low pressure lifts across new england overnight. 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 Groton, MA
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location: 42.6, -71.63     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 260242
afdbox
area forecast discussion
national weather service boston norton ma
1042 pm edt Wed apr 25 2018

Synopsis
Low pressure will push northeast from the mid atlantic coast,
crossing the region overnight. 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
1015 pm update...

area of shra +shra moving across central and northern areas this
evening. May see an embedded brief thunderstorm as it moves n-ne
across NE and N central mass through around midnight or so.

Noting another area of showers E of the central nj coast on
latest NE regional 88d radar imagery. Spotty c g lightning seen
with this areas, so could see isold thunder with this. As the
heavier showers shift ne, may see leftover light showers or even
drizzle with low level moisture in place.

Still noting some patchy dense fog along the ri S coast, though
visibilities have been between 1 4 and 1 2 mile. Also starting
to lower across S coastal mass, will monitor this for possible
dense fog advisories there.

S-se winds have been diminishing, but still noting some gusts up
to 20-25 kt. Will continue to see downward trend as the low
level jet moves offshore.

Previous discussion...

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. 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.

Another 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.

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 03z
and 09z 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 joules 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.

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 02z 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.

Overnight... Ifr-lifr conditions. Showers with locally heavy
rain through this evening and can't rule out an isold t-storm
through 05z across E mass ri NE ct terminals. 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 through 05z.

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 ...

overnight... 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.

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 evt
short term... Dunten
long term... Kjc
aviation... Kjc dunten evt
marine... Kjc dunten evt
equipment... Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 35 mi45 min 52°F 1002.7 hPa
BGXN3 - Great Bay Reserve, NH 53 mi78 min E 2.9 49°F 1005 hPa49°F
44013 - BOSTON 16 NM East of Boston, MA 55 mi73 min SE 14 G 14 48°F 44°F3 ft1004.5 hPa (-2.5)48°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fitchburg, Fitchburg Municipal Airport, MA8 mi71 minN 01.50 miFog/Mist55°F54°F96%1004.1 hPa
Nashua - Boire Field Airport, NH14 mi67 minN 02.00 miLight Rain Fog/Mist53°F53°F100%1005.3 hPa
Bedford, Hanscom Field, MA20 mi67 minSE 39.00 miOvercast57°F55°F96%1004.6 hPa
Jaffrey Airport-Silver Ranch, NH24 mi71 minN 05.00 miLight Rain Fog/Mist51°F51°F100%1004.5 hPa

Wind History from FIT (wind in knots)
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Last 24hrSE3SE3CalmCalmCalmNE3Calm3NE3E3E5E76E6E5NE5E3CalmCalmCalmCalmN3CalmW3
1 day agoCalmW6NW7SE4CalmCalm--W8W6SW5S8
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--S9S13S8S10S7S7S7SE6SE4
2 days agoN4NW4NW3CalmNW4CalmCalmCalmSE43SE5E43--5S12S8S14
G21
S10S7S7S4S4Calm

Tide / Current Tables for Riverside, Merrimack River, Massachusetts
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Riverside
Click for Map
Thu -- 04:21 AM EDT     Moonset
Thu -- 05:45 AM EDT     Sunrise
Thu -- 06:14 AM EDT     0.12 feet Low Tide
Thu -- 10:55 AM EDT     6.14 feet High Tide
Thu -- 04:04 PM EDT     Moonrise
Thu -- 06:45 PM EDT     -0.07 feet Low Tide
Thu -- 07:39 PM EDT     Sunset
Thu -- 11:30 PM EDT     6.19 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.54.63.52.31.20.50.10.52.14.15.66.15.95.24.12.81.60.60.1-012.94.96

Tide / Current Tables for Amelia Earhart Dam, Mystic River, Boston Harbor, Massachusetts
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Amelia Earhart Dam
Click for Map
Thu -- 02:47 AM EDT     0.33 feet Low Tide
Thu -- 04:21 AM EDT     Moonset
Thu -- 05:46 AM EDT     Sunrise
Thu -- 09:04 AM EDT     10.41 feet High Tide
Thu -- 03:19 PM EDT     -0.11 feet Low Tide
Thu -- 04:04 PM EDT     Moonrise
Thu -- 07:38 PM EDT     Sunset
Thu -- 09:38 PM EDT     10.40 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.22.70.80.41.22.95.37.89.710.49.98.56.33.71.3-00.21.53.66.38.710.110.39.4

Weather Map and Satellite Images
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wmap_A
GOES 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 (2,6,7,8)
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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.