Tuesday, September26, 2017 L-36.com


Marine Weather and Tides
Westerly, RI

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:38AMSunset 6:37PM Tuesday September 26, 2017 10:31 AM EDT (14:31 UTC) Moonrise 12:44PMMoonset 10:44PM Illumination 34% 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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ANZ237 Block Island Sound- 1016 Am Edt Tue Sep 26 2017
.small craft advisory for hazardous seas in effect through late Wednesday night...
This afternoon..SE winds around 5 kt. Seas 5 to 8 ft. Areas of fog. Vsby 1 nm or less.
Tonight..E winds around 5 kt. Seas 5 to 8 ft. Areas of fog. Vsby 1 nm or less.
Wed..E winds around 5 kt. Seas 5 to 8 ft. Areas of fog. Vsby 1 nm or less.
Wed night..E winds around 5 kt. Seas 5 to 8 ft. Areas of fog. A chance of showers. Vsby 1 to 3 nm.
Thu..N winds 5 to 10 kt. Seas 5 to 8 ft. Areas of fog. A chance of showers. Vsby 1 to 3 nm.
Thu night..N winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 8 ft.
Fri..NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Fri night..N winds 5 to 10 kt. Seas 2 to 4 ft.
Sat..NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Sat night..NE winds 5 to 10 kt. Seas around 2 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 1016 Am Edt Tue Sep 26 2017
Synopsis for massachusetts and rhode island coastal waters.. Areas of dense fog will impact the waters at times, mainly during the overnight and early to mid morning hours through Thu. Meanwhile, large southerly swell from distant hurricane maria will continue to impact our southern waters through the end of the work week. A cold front from canada will cross the waters on Thu and force maria to pass well southeast of our waters. Large high pres over the great lakes Sat will build across the waters Sun into Mon. 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 Westerly, RI
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location: 41.38, -71.83     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 261306
afdbox
area forecast discussion
national weather service taunton ma
906 am edt Tue sep 26 2017

Synopsis
Unseasonably warm and humid conditions will continue through
Wednesday, but there will be areas of overnight and early
morning dense fog. A cold front moves through southern new
england Wednesday night and then offshore during Thursday.

Moisture from maria may enhance shower activity as the front
moves through the CAPE and islands. Much cooler and less humid
air will follow the front for the end of the week and weekend.

Hurricane maria will continue to bring dangerous surf and rip
current conditions to the ocean exposed south coast but pass
well southeast of new england by week's end.

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

have updated coastal forecast to increase seas swells on the
mass eastern outer waters as well as the narragansett bay
entrance to 5-6 feet through Wed night. Have extended the small
craft advisory for hazardous seas to both those areas. Remainder
of forecast in pretty good shape.

Previous discussion...

biggest near term issue is the fog, locally dense across eastern
ma and ri. Some patchy drizzle has also been observed. Plan to
let the dense fog advisory expire at 8 am, when we should start
to experience slow improvement. A concern is that the fog may
persist just off the coast in many spots and possibly could slip
back in with a sea breeze circulation. This will bear close
watching during today. The speed at which the fog burns off
could also have an effect on today's eventual high temperatures.

Have also increased pops off the SE coast to reflect showers
that continue to develop re-develop there. Water vapor imagery
would seem to imply that this activity may be in part fueled
with moisture emanating from hurricane maria located some
distance east of the carolinas. This too may need to be watched
in the event some of this activity were to encroach closer to
land (cape and islands).

High temps a bit tricky today and will depend upon how quickly
low clouds fog scour out, but overall should be a degree or two
cooler than yesterday. Still quite warm and humid for this time
of year with highs in the 80s away from the immediate coast and
dewpoints in the 60s. The lower ct river valley should be the
warm spot this afternoon and went with highs in the upper 80s.

Mainly dry weather today although can not rule out a spot shower
later this afternoon evening along the east slopes of the
berks.

Short term 6 pm this evening through 6 pm Wednesday
***areas of dense fog likely to redevelop tonight***
tonight...

low clouds and areas of fog, some of which will likely be
locally dense should redevelop tonight. This from a combination
of light winds high dewpoints and longer nights given its late
september. The next shift may need to consider another dense fog
advisory. Low temps again will mainly be in the 60 to 65 degree
range.

Wednesday...

model cross sections indicate that the low clouds and fog may
persist a bit longer than today, especially along the coastal
plain. Nonetheless, do expect to see at least some improvement
along with partial sunshine eventually developing. High temps
should once again rise into the 80s away from the immediate
coast and it will once again be humid. Not much forcing deep
moisture given upper level ridge still in control so generally
expect dry weather to prevail, but can not rule out a spot
shower or two Wednesday afternoon.

Long term Wednesday night through Monday
Highlights...

* a cold front will pass across southern new england Wednesday night
into Thursday morning with scattered showers
* maria will pass well SE of new england, but moisture from maria
may enhance showers over the CAPE and islands Thursday morning
* much cooler and less humid air will follow the cold front for
Thursday afternoon through the weekend
medium range models depict a propensity for the large scale mid
level circulation to favor a ridge extending across the ohio valley
but also a series of short wave troughs that temporarily erode the
north side of the ridge. This suggests that our region may be
subject to alternating warm and cool temperatures over the next
1 to 2 weeks.

One vigorous but progressive upper trough will bring a surface cold
front through southern new england Wednesday night and Thursday
morning. This alone should suffice to mention a chance for showers.

As the front passes across the CAPE and islands, a consensus of
medium range models continues to suggest that moisture from maria
becomes entrained into the front even though maria itself appears
destined to pass out to sea well southeast of new england. The
moisture entrainment may result in some heavy downpours somewhat
reminiscent of a pre setup. Model guidance continues to suggest
showalters near zero, k indices above 30, and precipitable waters
near 2 inches as the front passes through southeast new england. It
is possible, however, that the heavier showers develop just
offshore.

Behind the surface cold front, much cooler and less humid air moves
into the region. Although temperatures will be nearly 20 degrees
cooler, this actually just brings temperatures to near seasonable
levels for this time of year.

There is a second short wave trough and secondary cold front that
moves through late Friday night into Saturday morning. There may be
enough moisture and low level convergence to support at least widely
scattered showers during late Friday night Saturday morning.

Aviation 13z Tuesday through Saturday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday ...

today... Moderate confidence. Widespread ifr-lifr conditions
exist early this morning in low clouds and areas of fog. Expect
gradual improvement through mid and late morning, but a lot of
uncertainty remains on the specific timing. Light onshore flow
driven by sea breeze circulations may result in low clouds fog
patches skirting the shore all day especially across the cape
and islands.

Tonight... Moderate confidence. Widespread ifr-lifr conditions
expected to redevelop once again as the night wears on in low
clouds and areas of fog, some of which will be locally dense
again. This a result of a cooling boundary layer coupled with
high dewpoints and light winds.

Wednesday... Moderate confidence. Widespread ifr-lifr conditions
should gradually improve in many locations later Wed am and
into the mid afternoon. However, low clouds and fog patches may
be stubborn along the coast especially the CAPE and islands.

Kbos taf... Moderate confidence in taf. Lifr conditions should
improve by mid to late morning, but will have to watch for
areas of fog and low clouds lingering near the harbor through
the afternoon. A light onshore wind flow opens the door to the
risk of fog low clouds drifting back over the airfield.

Kbdl taf... Moderate confidence in taf. Low clouds and fog are
expected to give way toVFR conditions by this afternoon. The
exact timing of the improvement, however, is hard to pin
down.

Outlook Wednesday night through Saturday ...

Wednesday night Thursday morning... Moderate confidence. Areas
of MVFR ceilings visibilities in scattered showers except areas
of ifr ceilings visibility in showers and fog.

Thursday afternoon through Saturday... High confidence of mostly
vfr conditions.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday ...

today through Wednesday... High confidence.

Update...

have issued small craft advisory for hazardous seas for the
eastern outer waters (anz250) through Wed night. Seas up to 5 ft
at buoy 44098 (jeffrey's ledge), and expect the long ground
swells from distant hurricane maria to continue to slowly
increase. Also extended a small craft for hazardous seas to
narragansett bay, mainly for the outer bay entrance starting
tonight. Swells up to 5-6 feet will reach there by evening.

Previous discussion...

long period southerly swell from distant hurricane maria will
result in 7 to 11 foot seas through Wednesday across our
southern waters. Small craft advisories from hazardous seas will
continue. In addition, areas of dense fog will impact the
waters and result in poor visibility for mariners at times,
especially during the overnight through mid morning hours.

Outlook Wednesday night through Saturday ...

high confidence through the period.

Swells from maria will likely affect the southern coastal waters
through at least Friday with hazardous seas. There may be a period
of north winds late Thursday into early Friday with 25 to 30 knot
gusts, especially across the eastern and southeastern zones. Showers
and fog may lower visibilities to less than a mile across some of
the coastal waters Wednesday night into Thursday morning. Visibility
is not expected to be an issue Thursday night through Saturday.

Tides coastal flooding
Long period southerly swells will continue to propagate
northward from distant hurricane maria across the southern
coastal waters. This will continue to create high surf and
dangerous rip currents along ocean exposed beaches of the south
coast, CAPE and islands. The high surf advisory remains in
effect through Wednesday in this region, but will likely need to
be extended through the end of the work week given the
continuation of long period swell working northward from maria.

Climate
Highs are expected to be a degree or two lower than yesterday,
while records for today are in the 89 to 95 degree range. Therefore,
not expecting any record highs to be set this afternoon,
although it will be very warm and humid away from the immediate
coast.

Box watches warnings advisories
Ct... None.

Ma... High surf advisory until 6 pm edt Wednesday for maz020-022>024.

Ri... High surf advisory until 6 pm edt Wednesday for riz006>008.

Marine... Small craft advisory for hazardous seas until 6 am edt
Thursday for anz233>235-237-250-254>256.

Small craft advisory for hazardous seas from 6 pm this evening
to 6 am edt Thursday for anz236.

Synopsis... Frank thompson
near term... Frank evt thompson
short term... Frank
long term... Thompson
aviation... Frank thompson
marine... Frank evt thompson
tides coastal flooding...

climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NLNC3 - 8461490 - New London, CT 14 mi44 min Calm G 1 68°F 69°F1017.7 hPa
MTKN6 - 8510560 - Montauk, NY 24 mi44 min 67°F 67°F1017.7 hPa
QPTR1 - 8454049 - Quonset Point, RI 27 mi50 min S 2.9 G 2.9 67°F 68°F1017.9 hPa
NWPR1 - 8452660 - Newport, RI 28 mi44 min N 2.9 G 4.1 67°F 65°F1017.3 hPa
PRUR1 32 mi44 min 68°F 68°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 32 mi50 min WSW 1.9 G 4.1 68°F 1017.7 hPa
NAXR1 - Narragansett Bay Reserve, RI 32 mi107 min Calm 68°F 68°F
CPTR1 - 8452944 - Conimicut Light, RI 35 mi50 min SSE 1.9 G 2.9 69°F 69°F1017.6 hPa
PVDR1 37 mi44 min SSE 4.1 G 5.1 71°F 1017.4 hPa67°F
FOXR1 - 8454000 - Providence, RI 37 mi44 min S 4.1 G 5.1 70°F 68°F1017.4 hPa
FRXM3 41 mi44 min 69°F 68°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 41 mi44 min SSW 1.9 G 2.9 69°F 1016.9 hPa
BUZM3 - Buzzards Bay, MA 42 mi32 min Calm G 1 66°F 1018.1 hPa (+0.3)
FRVM3 - 8447386 - Fall River, MA 42 mi50 min 69°F 69°F1018.3 hPa
44039 - Central Long Island Sound 47 mi47 min ESE 1.9 G 3.9 67°F 67°F
44017 - 23 Nautical Miles Southwest of Montauk Point, NY 49 mi42 min 64°F 65°F10 ft1018.2 hPa (+0.7)64°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 mi39 minN 010.00 miOvercast71°F68°F90%1018.1 hPa
Groton / New London, Groton / New London Airport, CT12 mi36 minS 41.00 miFog/Mist69°F66°F93%1017.8 hPa
Block Island State Airport, RI19 mi36 minS 44.00 miFog/Mist68°F66°F93%1018.6 hPa
Montauk, Montauk Airport, NY21 mi38 minN 0 mi69°F66°F93%1018.5 hPa

Wind History from WST (wind in knots)
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Last 24hrS4SE5SE8S6SE5SE7SE7SE7E3CalmSE3SE4CalmCalmCalmCalmCalmN4CalmCalmS3CalmCalmCalm
1 day agoNE4SE7SE6S7SW4CalmSW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN3CalmN3CalmN3SE4
2 days agoN13
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NE7N8N7NE5CalmCalmCalmCalmCalmCalmCalmCalm--CalmCalmCalmCalmN3NE3N5

Tide / Current Tables for Westerly, Pawcatuck River, Rhode Island
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Westerly
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Tue -- 01:55 AM EDT     2.44 feet High Tide
Tue -- 06:39 AM EDT     Sunrise
Tue -- 08:47 AM EDT     0.78 feet Low Tide
Tue -- 12:43 PM EDT     Moonrise
Tue -- 02:14 PM EDT     2.84 feet High Tide
Tue -- 06:37 PM EDT     Sunset
Tue -- 09:31 PM EDT     0.65 feet Low Tide
Tue -- 10:44 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
22.32.42.321.71.51.20.90.81.11.72.32.62.82.82.52.11.81.410.70.71.1

Tide / Current Tables for The Race, Long Island Sound, New York Current
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The Race
Click for Map
Tue -- 12:53 AM EDT     2.14 knots Max Flood
Tue -- 04:15 AM EDT     -0.00 knots Slack
Tue -- 06:40 AM EDT     Sunrise
Tue -- 07:14 AM EDT     -2.27 knots Max Ebb
Tue -- 10:21 AM EDT     0.00 knots Slack
Tue -- 12:44 PM EDT     Moonrise
Tue -- 01:11 PM EDT     2.12 knots Max Flood
Tue -- 04:32 PM EDT     -0.00 knots Slack
Tue -- 06:38 PM EDT     Sunset
Tue -- 07:42 PM EDT     -2.47 knots Max Ebb
Tue -- 10:45 PM EDT     Moonset
Tue -- 11:04 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.82.11.81.10.3-0.8-1.7-2.2-2.1-1.3-0.40.71.62.11.91.30.5-0.5-1.5-2.3-2.4-1.9-1.1-0.1

Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Boston, MA (10,2,3,4)
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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.