Friday, April20, 2018 L-36.com


Marine Weather and Tides
Yarmouth Port, 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 5:50AMSunset 7:29PM Friday April 20, 2018 11:45 PM EDT (03:45 UTC) Moonrise 9:29AMMoonset 12:00AM Illumination 32% Phase: Waxing Crescent; Moon at 6 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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ANZ231 Cape Cod Bay- 957 Pm Edt Fri Apr 20 2018
Overnight..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Sat..NW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft.
Sat night..SW winds around 5 kt, becoming nw after midnight. Seas around 2 ft.
Sun..NW winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft.
Sun night..S winds 5 to 10 kt, becoming nw after midnight. Seas 1 foot or less.
Mon..N winds around 5 kt, becoming se around 5 kt in the afternoon. Seas 1 foot or less.
Mon night..SW winds 5 to 10 kt. Seas 1 foot or less.
Tue..SW winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft.
Tue night..S winds 5 to 10 kt. Seas around 2 ft. A chance of rain.
Wed..SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Rain likely.
Wed night..SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Rain likely. 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 957 Pm Edt Fri Apr 20 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure will build over the waters this weekend lasting into Monday, then shifting offshore on Tuesday. Low pressure will move north along the eastern seaboard Tuesday night and Wednesday, lifting over the waters on Thursday. 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 Yarmouth Port, MA
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location: 41.71, -70.29     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 210156
afdbox
area forecast discussion
national weather service boston norton ma
956 pm edt Fri apr 20 2018

Synopsis
High pressure builds just west of new england into Saturday and
will bring gradually rising temperatures and dry weather into
early next week. Wet and breezy weather forecast midweek.

Perhaps a late week lull before becoming dreary again next
weekend.

Near term until 6 am Saturday morning
Small adjustments to temperatures and sky cover based on 9 pm
observations and satellite. The forecast continues to anticipate
general clearing and diminishing northwest winds.

With diminishing wind and dew points in the 20s, we continue to
expect temperatures at or below freezing in the interior later
tonight, leading to frosty conditions in some spots.

Short term 6 am Saturday morning through Saturday night
High pressure moves closer to our region, but the core remains
to our west. Thus, general NW flow expected to continue through
Saturday night. Local seabreezes are possible, but remain a low
risk at this point in time. Dry weather continues beneath a mainly
clear sky.

Temperatures will remain below normal, still. More frost expected
Saturday night.

Long term Sunday through Friday
* highlights...

- warm up thru early week, dry, watching for seabreezes
- wet, breezy midweek
- perhaps a reprieve Friday, possibly Saturday
- return of wet, dreary weather for the following weekend
* overview...

aleutian low focus. With maturation, immediate downstream
energy is cut off, westerlies dominate, polar air held n,
beginning influence via sub-tropical s-stream along isentropes.

However deepening toward occlusion, later death, strong warm sw
isentropic push into canada, ridge dominance, energy sheared s,
n-stream captured, slip of cooler air late week. However depth
in question given progressive atlantic plus s-stream influence.

Polar low dipping S following weekend, yet milder air infused
with transition into late-spring. While the eps progs anomalous
cool h85 temperatures into early may, outcomes may be dreary,
wet, cool, however not wintry.

Warming trend into early week, s-stream disturbance midweek, a
dip within preferred h5 trof pattern with sheared pacific energy
swept e, brief cool down beneath clouds, rain, breezy via
clipping jet streak. Lull possible Friday prior to a stronger
system for the following weekend, potentially cooler. Seemingly
ebb and flow, yet appears spring-like weather has finally
arrived. Forecast targets of opportunity discussed below.

* discussion...

Sunday through Tuesday...

high pressure, light winds, monitoring: 1.) daytime sea-breezes
yielding sharp coastal-interior temperature gradients, 2.)
overnight radiational cooling, and 3.) when high pressure shifts
e allowing S SW warmer air (mainly Tuesday). Suppressing ridge
remaining in place, ascending cloud cover per approaching
midweek storm holds off, Tuesday is the warmer of the two. Put a
mention of frost. Per ma agricultural extension, some farmers
have already planted.

Midweek...

wet weather anticipated. S-stream clash with e-shear pacific
energy. Tightening thermal gradient along 290-310k isentropes, s
low-level jet streak response. Precipitable water push to 1.25
inches, h85 dewpoints to 10c, high freezing level heights,
sneaking instability of a few hundred joules kg. Sub-tropical
warm, moist conveyor belt with crux of front-end thump
Wednesday. S SW low-level inflow below mid-upper level diffluent
sw. Jet coupling. Moderate, possibly heavy rain not out of the
question, however uncertain magnitude of faster winds aloft
transferring to surface. Likely pops. Sneak in thunder. Lean
breezier conditions across interior.

Following weekend...

upstream ridge amplification, E CONUS trof reloads. Gyre of
cooler weather prevailing, cyclonic flow, moisture laden,
looking dreary, wet. Considerable spread in ensemble members
meteograms, pass on any further discussion other than trending
broadscale pattern.

Aviation 02z Saturday through Wednesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday night ... High confidence.

Tonight...VFR with skies becoming skc. Diminishing NW winds.

Saturday and Saturday night...VFR. Mostly skc, winds less than
20 knots.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Sunday through Wednesday ... High confidence.

Sunday:VFR.

Sunday night:VFR. Patchy frost.

Monday through Monday night:VFR.

Tuesday:VFR. Breezy.

Tuesday night:VFR. Ra likely.

Wednesday: mainlyVFR, with local ifr possible. Breezy. Ra
likely.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday night ... High confidence.

Northwest winds will continue to diminish overnight, and seas
will subside. Most buoys are below 5 feet, but jeffreys ledge
nh, 44098, and nantucket southeast, 44008, linger at 5-7 feet.

We will hold on to the small craft advisory on the outer waters
until expiration at 2 am 06z.

Expecting winds and seas to remain below advisory levels
Saturday and Saturday night.

Outlook Sunday through Wednesday ... High confidence.

Sunday through Tuesday: winds less than 25 kt.

Tuesday night: winds less than 25 kt. Chance of rain.

Wednesday: low risk for small craft advisory winds with gusts
up to 25 kt. Local rough seas. Rain likely.

Box watches warnings advisories
Small craft advisory will linger a little while
longer on the outer waters, mostly for seas. With left boston
harbor for a little while longer, where mixing was better with
nw winds.

Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 2 am edt Saturday for anz250-
254>256.

Synopsis... Belk sipprell
near term... Wtb belk sipprell
short term... Belk
long term... Sipprell
aviation... Belk sipprell
marine... Wtb belk sipprell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi75 min 42°F4 ft
WAXM3 - Waquoit Bay Reserve, MA 15 mi60 min 6 45°F 1024 hPa28°F
44020 - NANTUCKET SOUND 20 mi55 min NNW 16 G 19 44°F 43°F2 ft1023.3 hPa (+2.7)36°F
BZBM3 - 8447930 - Woods Hole, MA 24 mi45 min 44°F 44°F1024.1 hPa (+2.5)
NTKM3 - 8449130 - Nantucket Island, MA 31 mi45 min N 8 G 15 44°F 46°F1023.7 hPa (+2.2)
BUZM3 - Buzzards Bay, MA 45 mi45 min NNW 19 G 21 45°F 1025 hPa (+2.9)
FRVM3 - 8447386 - Fall River, MA 46 mi45 min 44°F 45°F1025.1 hPa (+2.3)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi45 min NNW 9.9 G 13 44°F 1023.9 hPa (+2.4)
FRXM3 47 mi57 min 45°F 27°F
44013 - BOSTON 16 NM East of Boston, MA 48 mi55 min NW 18 G 21 43°F 42°F3 ft1022.7 hPa (+2.5)

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA2 mi49 minNNW 1110.00 miFair43°F32°F65%1023 hPa
Otis Air National Guard Base, MA13 mi50 minNW 10 G 1610.00 miFair41°F26°F57%1024 hPa
Chatham, Chatham Municipal Airport, MA16 mi53 minNNW 8 G 1710.00 miFair43°F32°F65%1023.7 hPa
Provincetown Municipal Airport, MA21 mi49 minNW 17 G 2210.00 miFair42°F32°F68%1023.5 hPa

Wind History from HYA (wind in knots)
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Last 24hrNW9NW8W11
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N8N8
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1 day agoW6W5W5W3CalmCalmS5SW4NE4NE4NE4NE6N8N9N3N7NW8NW8N5W4W3W4W5W7
2 days agoW12W10W9W5W8W8W8W8W14
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SW12SW11SW8SW8W6

Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
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Barnstable Harbor
Click for Map
Fri -- 03:03 AM EDT     11.27 feet High Tide
Fri -- 05:53 AM EDT     Sunrise
Fri -- 09:29 AM EDT     Moonrise
Fri -- 09:48 AM EDT     -0.98 feet Low Tide
Fri -- 03:43 PM EDT     10.01 feet High Tide
Fri -- 07:27 PM EDT     Sunset
Fri -- 10:05 PM EDT     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.68.210.411.310.78.96.53.81.4-0.4-0.90.42.85.47.99.61097.252.91.10.21

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Fri -- 01:04 AM EDT     -0.07 knots Slack
Fri -- 04:13 AM EDT     -4.74 knots Max Ebb
Fri -- 05:54 AM EDT     Sunrise
Fri -- 07:14 AM EDT     0.21 knots Slack
Fri -- 09:30 AM EDT     Moonrise
Fri -- 10:17 AM EDT     4.56 knots Max Flood
Fri -- 01:47 PM EDT     -0.01 knots Slack
Fri -- 04:44 PM EDT     -4.50 knots Max Ebb
Fri -- 07:28 PM EDT     Sunset
Fri -- 07:42 PM EDT     0.20 knots Slack
Fri -- 10:37 PM EDT     4.23 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
30.8-3-4.2-4.7-4.5-3.6-1.62.84.14.54.43.82.6-1.4-3.4-4.3-4.5-3.9-2.61.73.44.14.2

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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (23,6,7,8)
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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.