Monday, May21, 2018 L-36.com


Marine Weather and Tides
West Dennis, MA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 5:13AMSunset 8:01PM Monday May 21, 2018 11:10 AM EDT (15:10 UTC) Moonrise 11:37AMMoonset 1:07AM Illumination 42% Phase: First Quarter Moon; Moon at 7 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
    EDIT      (on/off)   Help
ANZ232 Nantucket Sound- 959 Am Edt Mon May 21 2018
This afternoon..N winds 5 to 10 kt, becoming s. Seas around 2 ft.
Tonight..SW winds 5 to 10 kt. Seas 2 to 3 ft.
Tue..S winds 5 to 10 kt. Seas 1 foot or less. A chance of showers.
Tue night..S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. A chance of showers.
Wed..W winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Wed night..SW winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft.
Thu..NE winds 5 to 10 kt. Seas around 2 ft.
Thu night..S winds 10 to 15 kt. Seas 2 to 3 ft.
Fri..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Fri night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. 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 959 Am Edt Mon May 21 2018
Synopsis for massachusetts and rhode island coastal waters.. High pres builds over the waters today, se of the waters tonight, then head farther E Tue. A low pres approaches the waters from the sw late Tue, lifting ne Tue night. High pres builds E over new england Wed and Thu, then se of the waters on Fri. 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 West Dennis, MA
   Hourly   EDIT   Help
location: 41.67, -70.18     debug


Area Discussion for - Boston, MA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 kbox 211332
afdbox
area forecast discussion
national weather service boston norton ma
932 am edt Mon may 21 2018

Synopsis
Dry weather is in store through tonight. Cooler with passing
showers Tuesday afternoon as a warm front approaches. Showers
are still likely Tuesday night as weak low pressure moves
across the region. Mainly dry weather Wednesday through Friday.

Moisture increases through the weekend with the best chance of
showers on Sunday. Much warmer Friday into the weekend.

Near term until 6 pm this evening
930 am update...

high pressure in control will result in continued sunny skies,
light winds and a beautiful afternoon along with low humidity.

Highs will mainly top out in the upper 70s to around 80... But a
bit cooler along the immediate coast with sea breezes developing
given weak pressure gradient.

Short term 6 pm this evening through 6 pm Tuesday
High pressure moves through our region tonight. Winds turn sw,
starting the warm air advection process. Only impact should be
increasing mid and high level clouds. Light winds to start
should lead to modest radiational cooling conditions before the
clouds arrive, especially with the lower dew points. Preferred
the lower mos-based minimum temperatures.

For Tuesday, a passing mid level shortwave and a low pressure
moving into the great lakes should be enough to warrant at least
a chance of showers. Low and mid level lapse rates expected to
be rather poor to start the day. While low level lapse rates are
unlikely to favor thunderstorms, mid level lapse rates may
steepen just enough later in the afternoon and evening where a
few thunderstorms may develop. Many more clouds in place, so
expecting temperatures to be 5-10 degrees lower than Monday, still
near to slightly below normal.

Long term Tuesday night through Sunday
Highlights...

* showers likely Tuesday night
* cool Thursday but much warmer into the weekend
* risk of showers increases by Sunday
overview...

a northern stream trough will amplify to the north and east wed
into Thu which will push a cold front through the region.

Rising heights and shortwave ridging follow Fri into Sat then
the next northern stream trough approaches Sunday.

Tuesday night... Low pressure moves across new england and off
the coast late. Showers are likely in southeastern ma and ri
with more scattered showers farther to the north and west.

Although there is no surface instability, some marginal elevated
instability could support an isolated thunderstorm.

Wednesday... Early morning cloudiness gives way to mostly sunny
skies. However, an approaching cold front could trigger widely
scattered showers in eastern ma where there will be a weak
trough, CAPE of 500-1000 j kg, and a narrow axis of k indices of
32. Highs 75-80 away from the coast.

Thursday... Sunny skies but 850 mb temperatures will have cooled
from +13c Wed to +8c on thu. Winds will be light NW inland but
ne at the coast. Expecting highs 70 to 75 inland but cool upper
50s to lower 60s along CAPE ann, CAPE cod, and the islands.

Friday... High pressure to our southeast and weak low pressure
over northern new england will lead to a westerly downsloping
flow of air across southern new england. That, coupled with
ridging at 500 mb will lead to a much warmer day. Right now am
calling for 80-85 away from the coast, but it is possible to see
a few upper 80s readings.

Saturday and Sunday... In general, moisture will be increasing
through the weekend as flow aloft shifts to the southwest.

Increasing precipitable waters as deep tropical plume that has
been sitting along the southeast u.S. Coast edges its way
through the mid-atlantic and we begin to get on the northern
fringes of the moisture. K indices increase to the mid 30s in
southwestern ct by Sunday. Thus scattered showers on Saturday
will become more numerous by Sunday. Cannot rule out scattered
thunderstorms, too.

In addition, a warm front will be in the vicinity. Its location
will have major ramifications for the temperature forecast. If
it moves completely northward through the region, then highs
both Sat and Sunday could be well up into the 80s to near 90 in
a few spots. But, as the gem has been hinting, there is a chance
that it only bisects the region and the northeast portions of
the region could be stuck in the 60s. For now, have blended the
models and gone a few degrees higher than the blend, which
yields 80-85 inland Sat and 77-81 Sunday, but again, these are
subject to much change.

Aviation 14z Monday through Friday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ... High confidence.

Through tonight...VFR with winds less than 10 kt. Local
seabreezes from mid morning into early evening.

Tuesday...VFR. Shra moving from west to east across southern new
england during the day. Low risk for a few -tsra, too.

Kbos terminal... High confidence in taf. Sea breeze should
develop between 14 and 16z.

Kbdl terminal... High confidence in taf.

Outlook Tuesday night through Friday ... Moderate confidence.

Tuesday night: MVFR with areas of ifr. Showers likely. Areas of
fog.

Wednesday:VFR. Slight chance shra, mainly eastern ma.

Wednesday night through Friday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ... High confidence.

We have dropped the remainder of the small craft headlines as
seas have dropped below 5 feet. Winds will remain rather light
across the coastal waters through Tuesday. Some showers arrive
across the waters during Tuesday afternoon, and continue into
the evening hours. Low risk for a few rumbles of thunder, too.

Outlook Tuesday night through Friday ... Moderate confidence.

Tuesday night: winds less than 25 kt. Showers likely. Areas of
fog with visibility reduced to 3 nm or less.

Wednesday: winds less than 25 kt. Slight chance of a shower.

Wednesday night through Thursday night: winds less than 25 kt.

Friday: winds less than 25 kt. Seas approaching 5 ft southern
and eastern outer waters toward evening.

Fire weather
Spotty locations received as much as 0.5 inches of precipitation
this past weekend, but several locations received less. Given
fuels were dry, this may not have been enough to fully moisten
them. Rh values Monday will drop as low as 25 percent inland,
but winds should remain light out of the nw, around 10 mph most
of the day.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Belk gaf
near term... Frank
short term... Belk
long term... Gaf
aviation... Frank belk gaf
marine... Frank belk gaf
fire weather... Staff


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 14 mi41 min 53°F1 ft
44020 - NANTUCKET SOUND 16 mi81 min NNW 7.8 G 7.8 55°F 51°F1 ft1021.4 hPa (+2.1)55°F
WAXM3 - Waquoit Bay Reserve, MA 19 mi86 min 1.9 66°F 1021 hPa49°F
NTKM3 - 8449130 - Nantucket Island, MA 27 mi47 min N 5.1 G 8 61°F 57°F1021.8 hPa
BZBM3 - 8447930 - Woods Hole, MA 28 mi41 min 61°F 55°F1021.7 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 37 mi81 min WNW 5.8 G 7.8 52°F 2 ft1021.5 hPa (+1.7)51°F
BUZM3 - Buzzards Bay, MA 49 mi71 min N 5.1 G 5.1 60°F 1022.2 hPa (+1.8)

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
Last
24hr
SW12
G18
SW12
G19
SW12
G22
SW9
G22
SW8
G19
SW15
G22
SW8
G15
SW7
G15
SW8
G19
W7
G11
SW7
W6
G9
W6
NW5
NW5
G9
NW3
N7
G11
N6
N7
G12
N7
G11
N6
G9
N7
G10
N7
G10
N7
G10
1 day
ago
E10
G13
E12
G15
E12
E10
E7
G10
E8
E7
G10
SE7
G10
S6
G10
S7
G11
S8
G11
S7
G13
S8
G17
SW8
G15
SW8
G15
SW9
G16
SW8
G15
SW11
G17
SW8
G14
SW10
G17
SW10
G16
SW9
G18
SW11
G18
SW11
G19
2 days
ago
NE13
G19
NE13
G19
NE13
G20
NE14
G18
NE13
G18
E13
G16
E12
G15
E10
E11
G14
E9
G12
E9
E11
E9
G15
E9
G12
E10
G14
E10
G13
E12
G16
E12
G15
E14
G17

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA5 mi15 minNNE 810.00 miFair66°F51°F59%1021.4 hPa
Chatham, Chatham Municipal Airport, MA10 mi19 minNE 710.00 miFair67°F46°F47%1021.8 hPa
Otis Air National Guard Base, MA18 mi16 minN 010.00 miFair66°F39°F37%1022 hPa
Provincetown Municipal Airport, MA24 mi15 minNW 710.00 miFair60°F51°F72%1021.8 hPa

Wind History from HYA (wind in knots)
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
Last 24hrSW21
G30
SW22
G29
SW18
G24
SW9
G17
SW11S9SW7SW5S4SW4CalmNW6N6N4N7N7N7N7N5N5N9N9
G16
N7N8
1 day agoE10
G15
SE10SE5E6SE6E7SE7SE7SE5S5S7S9SW11SW9SW10SW11SW19
G31
S9SW16
G22
SW8SW15
G22
SW15
G21
SW16
G23
SW20
G28
2 days agoN17
G25
NE16
G26
NE16
G28
NE14NE9NE11NE9NE8NE5NE5E4CalmCalmNE3NE3NE3NE4NE3NE3NE4E9E9
G16
E9E9

Tide / Current Tables for South Yarmouth, Bass River, Nantucket Sound, Massachusetts
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
South Yarmouth
Click for Map
Mon -- 12:03 AM EDT     0.03 feet Low Tide
Mon -- 01:06 AM EDT     Moonset
Mon -- 05:15 AM EDT     Sunrise
Mon -- 06:18 AM EDT     3.29 feet High Tide
Mon -- 11:37 AM EDT     Moonrise
Mon -- 12:42 PM EDT     -0.28 feet Low Tide
Mon -- 07:05 PM EDT     2.96 feet High Tide
Mon -- 07:59 PM EDT     Sunset
Mon -- 11:50 PM EDT     First Quarter
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
00.30.91.62.32.93.33.22.721.20.4-0.1-0.30.10.71.42.12.732.82.41.71

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Pollock Rip Channel
Click for Map
Mon -- 01:05 AM EDT     Moonset
Mon -- 02:35 AM EDT     -0.00 knots Slack
Mon -- 05:15 AM EDT     Sunrise
Mon -- 05:17 AM EDT     -1.78 knots Max Ebb
Mon -- 08:27 AM EDT     0.00 knots Slack
Mon -- 11:36 AM EDT     Moonrise
Mon -- 11:57 AM EDT     2.08 knots Max Flood
Mon -- 03:22 PM EDT     -0.00 knots Slack
Mon -- 06:01 PM EDT     -1.67 knots Max Ebb
Mon -- 07:58 PM EDT     Sunset
Mon -- 09:15 PM EDT     0.00 knots Slack
Mon -- 11:50 PM EDT     First Quarter
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.30.6-0.4-1.3-1.8-1.7-1.2-0.40.51.41.92.11.91.30.4-0.6-1.4-1.7-1.5-1-0.20.61.3

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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 (11,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Boston, MA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.