Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Weekapaug, RI

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 6:32AMSunset 7:11PM Wednesday March 29, 2017 3:16 AM EDT (07:16 UTC) Moonrise 7:44AMMoonset 9:08PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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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ANZ237 Block Island Sound- 117 Am Edt Wed Mar 29 2017
.small craft advisory in effect from this evening through Thursday morning...
Rest of tonight..N winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog. Rain. Vsby 1 to 3 nm.
Wed..N winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Wed night..N winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Thu..NW winds 5 to 10 kt. Gusts up to 20 kt in the morning. Seas 2 to 3 ft.
Thu night..S winds around 5 kt...becoming E around 5 kt after midnight. Seas around 2 ft.
Fri..E winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. Rain likely.
Fri night..E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Rain.
Sat..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Rain likely.
Sat night..N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of rain.
Sun..NW winds 10 to 15 kt. Seas 2 to 4 ft.
Sun night..W winds 5 to 10 kt. Seas 2 to 3 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 117 Am Edt Wed Mar 29 2017
Synopsis for massachusetts and rhode island coastal waters.. Low tracks across the southern waters overnight. Strong high pressure over quebec builds S into new england Wednesday into Thursday. More unsettled weather is in the forecast for late Friday into Saturday as low pressure likely tracks just southeast of the waters followed by high pressure Sunday into early next week. 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 Weekapaug, RI
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location: 41.33, -71.76     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 290159
afdbox
area forecast discussion
national weather service taunton ma
959 pm edt Tue mar 28 2017

Synopsis
Wet weather continues through tonight. Improving into Wednesday
into Thursday as high pressure delivers cool and dry weather.

Low pressure from the ohio valley Friday will redevelop south of
new england Friday night into Saturday. This bring snow, mixed
precipitation and rain Friday into early Saturday, followed by
dry weather Sunday and Monday.

Near term /until 6 am Wednesday morning/
10 pm update...

with low pres continuing to very slowly deepen, and now about
100nm E of the delmarva, the deformation banding across much of
s new england continued to contract. This will continue to have
two impacts, in that it will allow the rain to end across W and
nw portions of ma/ct over the next few hours, but increase
rainfall rates across portsion of E ma and ri through early am.

Will taper pops toward latest hrrr which continues to capture
this progression well. Otherwise, bulk of the forecast remains
on track with this update.

Previous discussion...

widespread rain with a low risk of thunderstorms. If any, mainly
isolated. Anomalous deep-layer moisture with precipitable waters
in excess of an inch undergoing deep layer forcing ahead of a
low emerging out of the mid-atlantic and sweeping E immediately
s of new england. Watching closely attendant frontal boundaries
including that of the kink across our region for focused areas
of frontogenetical convergence and subsequent moderate to perhaps
heavy rain, as well as any instability that creeps N as indicated
by the latest SPC mesoanalysis into S new england.

Latest hrrr / rap model trends seem to be highlighting trends well
enough. A blend is preferred. Continued thinking of a decent slug
of rain. Amounts of 0.50 to 0.75 with the heavier amounts focused
s/e. Some locations, especially along the S coast may see higher
amounts where there is a greater risk for convection.

Otherwise low clouds, dreary, light E flow. With the increasing
moisture across the region, will see clouds lower resulting in
patchy dense fog redeveloping across the region, especially over
the high terrain. Visibility down to a quarter mile or less in
spots. More than likely holding through midnight, a gradual w
to E progression of fog erosion as winds turn NW ushering into
the region cooler and drier air towards morning.

Temperatures mainly holding in the 40s but dropping into the
30s via cold air advection, either via n/e winds with initial
high pressure damming, or behind the departing low late with the
aforementioned n/w cool, dry winds. Temperatures should remain
above freezing across all of S new england, so no concerns at
the moment for black ice developing on area roadways.

Short term /6 am Wednesday morning through Wednesday night/
Wednesday and Wednesday night...

drying out and turning breezy. Departing low pressure deepens out
across the georges bank as a 1030+ high pressure builds S out of
canada. Combination of the tight gradient and pressure rises, cold
air advection proceeding with an increasing component of isallobaric
flow, will see winds increase out of the NW with gusts up to 30 to
35 mph late in the day into evening, especially out across e/se ma,
given stronger winds aloft at times during efficient boundary layer
mixing up to h85.

Conditions clearing during the morning. A mix of Sun and clouds thru
the remainder of the day and clearing overnight. Given the late-
march sunshine with a warm airmass aloft lingering, albeit cold air
advection will be ongoing, temperatures warm up around the upper 40s
to low 50s around midday. Dropping down into the 20s overnight. Dry
air and breezy winds through the day, roads should dry out.

Long term /Thursday through Tuesday/
*/ highlights...

* dry and seasonable Thursday
* snow and rain developing Fri and continuing into early sat
* plowable snow likely over higher elevations
* dry and seasonable Sunday and Monday
*/ discussion...

Thursday...

high pressure builds across new eng which will bring sunshine and
seasonable temps. It may be a bit breezy in the morning across
eastern new eng given the pressure gradient in place, but trend will
be for diminishing wind during the day. 850 mb temps around -5c in
the afternoon supports highs mid 40s to around 50 degrees.

Thursday night through Saturday...

complex forecast evolving as potent southern stream trof approaches
fri into Sat and interacts with northern stream energy. Result will
be a primary low lifting through the ohio valley and eastern lakes
fri with deepening secondary low expected south of new england
Friday night into sat. As is typical at this time range there are
model differences in track and intensity of the low pres which will
affect qpf, thermal profile and potential snow accum.

There will be two periods of precip, the first assocd with the warm
advection ahead of the primary low during fri, with a second pulse
fri night into early Sat and this may be heavy at times depending on
the track and intensity of low pres to the south.

Expect precip to overspread sne from west to east after midnight thu
night to daybreak Friday. With strong high pres to NE the column
will be sufficiently cold for most areas to begin as snow. However,
due to marginal boundary layer temps snow may mix or even change to
rain at times when precip intensity is light, especially near the
coastal plain. During heavier periods, the precip will likely be
snow given cold temps aloft. Minor accum are possible all the way to
the coastal plain but any accum during the day will be confined to
colder surfaces with most roads remaining wet. Exception is across
higher elevations in interior ma and northern ct where colder temps
may result in some accum on roadways.

The second period of precip will be Fri night into early Sat assocd
with comma head from intensifying low pres to the south. There are
differences in the track which will impact intensity of precip but a
period of heavy precip is possible. The uncertainty is temps will be
warming aloft from SW to NE so ptype is very much uncertain,
especially north of the pike. Expect mainly rain possibly mixed with
sleet at times south of the pike. To the north, expect snow changing
to sleet, freezing rain and rain but this is uncertain and subtle
changes in the thermal profile and timing would yield different
outcomes. Several inches snow accum possible north of the pike with
best chance of warning level snow over the east slopes of the
berkshires and northern worcester hills. There is also a risk of
some ice accretion over the higher elevations as precip transitions
to rain with temps hovering around freezing.

Precip should taper off Sat morning with improving conditions in the
afternoon.

Sunday...

showers may linger late Saturday evening into Sunday
morning as the low pressure system moves offshore. With the low
offshore and a high pressure area building into the region, skies
will clear throughout the day. Winds will continue to diminish along
the coast, with winds gusting to 20 mph throughout the day. As the
high pressure moves in, northerly winds will become westerly.

Temperatures will be seasonable Sunday with high temperatures in the
upper 40s to low 50s across the region.

Monday and Tuesday...

both days will be seasonable with temperatures ranging in the upper
40s to mid 50s. Monday will be dry as the high pressure remains
overhead. Skies will be mostly sunny throughout the day with near
calm winds.

A low pressure approaches from the southwest Tuesday, bringing
widespread precipitation to the area. Precip will move into the area
after midnight, moving from west to east across southern new
england. Rain accumulations around a quarter inch are expected, with
locally high amounts of a half inch.

Aviation /02z Wednesday through Sunday/
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term /through Wednesday night/...

00z update...

tonight..High confidence. Hold with ifr/lifr CIGS with vsbys
lowering MVFR-ifr in areas of fog developing. Low risk tsra,
mainly over the islands. N/e flow. Improving toVFR ct valley
toward morning however rest of sne likely to remain beneath
ifr-lifr.

Wednesday into Wednesday night... High confidence.

Improving conditions through morning withVFR everywhere by 18z,
lingering longest over the CAPE and islands. Nnw winds. Gusts to
20-25 kt at times.

Kbos taf... Will hold with ifr through 12z Wednesday. CIGS 800
feet or less. -ra/ra moving through 20z-6z. Some variability in
visibility during this time frame, though a lowering trends
prior to n/e winds shifting out of the w.

Kbdl taf... Will hold with ifr through roughly 9z Wednesday with
cigs 800 feet or less. -ra moving in presently becoming ra late
afternoon into evening, improving shortly before midnight. Vsbys
variable though a downward trend overnight with n/e flow before
winds become w.

Outlook /Thursday through Sunday/...

Thursday... High confidence.VFR. Winds diminishing.

Friday-Saturday... Moderate confidence. Conditions lowering to ifr
with areas of lifr with snow and mixed rain/snow transitioning to
rain south of the pike Fri evening. Snow changing to rain and
freezing rain north of the pike Fri evening. Precip ends sat
morning with improving conditions in the afternoon.

Sunday...

MVFR conditions becomingVFR in E massachusetts as showers linger
in association with a low pressure area moving offshore.VFR
conditions for the remainder of the area.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term /through Wednesday night/...

through Wednesday night...

rain and some visibility restrictions will impact the waters
overnight as an area of low pressure passes over the S waters.

Exiting E out over the georges bank as high pressure builds s
out of canada, NW flow increases with the potential for gusts up
around 30 kts developing Wednesday evening and continuing over-
night with a low risk of gales. Seas build towards 6 to 8 feet
on the outer waters. Small craft advisories issued accordingly
with the increasing N winds beginning Wednesday into Wednesday
night.

Outlook /Thursday through Sunday/...

Thursday... High confidence.

Sca northerly gusts 25-30 kt in the morning eastern waters
diminishing in the afternoon.

Friday into Saturday... Moderate confidence.

Easterly winds below SCA fri. Increasing SE winds Fri night with
sca gusts likely then shifting to NE Saturday. Vsbys reduced in
rain and fog mixed with snow Friday.

Sunday... Moderate confidence
low pressure area moving off the coast of new england will result in
diminishing winds along the SE waters. Small craft advisory may
be needed.

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

Ma... None.

Ri... None.

Marine... Small craft advisory from 11 am Wednesday to 8 am edt Thursday
for anz231>234-251.

Small craft advisory from 5 pm Wednesday to 8 am edt Thursday
for anz230.

Small craft advisory from 8 pm Wednesday to 8 am edt Thursday
for anz235>237.

Small craft advisory from 5 am Wednesday to 8 am edt Thursday
for anz250-254>256.

Synopsis... Kjc/sipprell/correia
near term... Doody/sipprell
short term... Sipprell
long term... Kjc/correia
aviation... Kjc/sipprell/correia
marine... Kjc/sipprell/correia


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 17 mi31 min N 11 G 13 40°F 38°F
NLNC3 - 8461490 - New London, CT 18 mi46 min N 4.1 G 8 40°F 40°F1012.5 hPa
NWPR1 - 8452660 - Newport, RI 26 mi46 min N 8.9 G 13 40°F 39°F1012.1 hPa
QPTR1 - 8454049 - Quonset Point, RI 26 mi46 min N 8.9 G 13 39°F1012.8 hPa
NAXR1 - Narragansett Bay Reserve, RI 31 mi91 min NNE 12 39°F 1013 hPa39°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 31 mi46 min NE 9.9 G 13 39°F 1013.2 hPa
CPTR1 - 8452944 - Conimicut Light, RI 35 mi46 min N 8.9 G 12 39°F 41°F1012.6 hPa
PVDR1 37 mi46 min N 8 G 12 40°F 1012.4 hPa39°F
FOXR1 - 8454000 - Providence, RI 38 mi46 min NE 7 G 9.9 39°F 40°F1012 hPa
BUZM3 - Buzzards Bay, MA 39 mi76 min N 18 G 19 39°F 1012 hPa (-1.3)
FRXM3 40 mi46 min 40°F 39°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 40 mi46 min NNE 9.9 G 13 40°F 1012.8 hPa
FRVM3 - 8447386 - Fall River, MA 41 mi46 min 39°F 39°F1012.8 hPa
44097 - Block Island, RI (154) 42 mi51 min 40°F4 ft
44017 - 23 Nautical Miles Southwest of Montauk Point, NY 47 mi86 min 40°F 42°F5 ft1011.8 hPa (-0.8)40°F
44039 - Central Long Island Sound 49 mi46 min NNW 3.9 G 5.8 40°F

Wind History for New London, CT
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Westerly, Westerly State Airport, RI3 mi23 minN 710.00 miLight Rain41°F39°F93%1012.5 hPa
Block Island State Airport, RI14 mi20 minNNE 10 G 1710.00 miLight Rain39°F37°F96%1012.3 hPa
Groton / New London, Groton / New London Airport, CT15 mi20 minN 610.00 miOvercast40°F37°F93%1012.5 hPa
Montauk, Montauk Airport, NY19 mi22 minN 6 mi41°F39°F93%1012.6 hPa

Wind History from WST (wind in knots)
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Last 24hrE3NE3E3E8E9E9E8E9E10E8S8E8NE8NE8NE6NE4E4E4N7N5NE5N6N7N7
1 day agoNE6NE8E9E10E10E9E11E8SE8SE5S4SW5SW3S4W4SW5W4CalmNW5N4NW4N4CalmCalm
2 days agoNE4NE3NE3NE4NE6NE10NE6NE9E11
G17
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G18
E9E14E10E10E8E9E8E7NE7E10E8

Tide / Current Tables for Weekapaug Point, Block Island Sound, Rhode Island
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Weekapaug Point
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Wed -- 04:04 AM EDT     -0.66 feet Low Tide
Wed -- 06:34 AM EDT     Sunrise
Wed -- 07:44 AM EDT     Moonrise
Wed -- 10:13 AM EDT     3.11 feet High Tide
Wed -- 04:11 PM EDT     -0.65 feet Low Tide
Wed -- 07:09 PM EDT     Sunset
Wed -- 09:07 PM EDT     Moonset
Wed -- 10:32 PM EDT     3.39 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.110.1-0.5-0.7-0.5-0.10.71.62.63.12.92.31.30.3-0.4-0.6-0.5-0.10.71.62.63.33.3

Tide / Current Tables for The Race, Long Island Sound, New York Current
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The Race
Click for Map
Wed -- 12:49 AM EDT     -0.00 knots Slack
Wed -- 03:58 AM EDT     -4.07 knots Max Ebb
Wed -- 06:36 AM EDT     Sunrise
Wed -- 07:09 AM EDT     0.00 knots Slack
Wed -- 07:45 AM EDT     Moonrise
Wed -- 10:02 AM EDT     3.64 knots Max Flood
Wed -- 01:15 PM EDT     -0.00 knots Slack
Wed -- 04:19 PM EDT     -3.84 knots Max Ebb
Wed -- 07:10 PM EDT     Sunset
Wed -- 07:23 PM EDT     0.01 knots Slack
Wed -- 09:08 PM EDT     Moonset
Wed -- 10:21 PM EDT     3.75 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.4-0.3-2.1-3.6-4.1-3.5-2.1-0.31.633.63.220.4-1.3-2.9-3.8-3.6-2.4-0.71.12.73.73.5

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 (3,6,7,8)
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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.