Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Narragansett Pier, RI

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 5:53AMSunset 7:34PM Saturday April 21, 2018 5:44 AM EDT (09:44 UTC) Moonrise 10:32AMMoonset 12:41AM Illumination 35% 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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ANZ236 Narragansett Bay- 333 Am Edt Sat Apr 21 2018
Today..W winds 5 to 10 kt. Waves around 2 ft.
Tonight..NW winds 5 to 10 kt. Waves around 2 ft.
Sun..NW winds around 5 kt, becoming W in the afternoon. Waves 1 foot or less.
Sun night..W winds 5 to 10 kt, becoming N after midnight. Waves around 2 ft.
Mon..N winds around 5 kt, becoming S in the afternoon. Waves 1 foot or less.
Mon night..S winds 5 to 10 kt. Waves around 2 ft.
Tue..S winds 5 to 10 kt. Waves around 2 ft.
Tue night..S winds 5 to 10 kt. Waves 2 to 3 ft.
Wed..SE winds 10 to 15 kt. Waves 2 to 4 ft. Rain likely.
Wed night..E winds 5 to 10 kt. Waves 2 to 4 ft. Showers 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 333 Am Edt Sat Apr 21 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure will build over the waters today through Monday. Then shift 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 Narragansett Pier, RI
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location: 41.44, -71.43     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 210737
afdbox
area forecast discussion
national weather service boston norton ma
337 am edt Sat apr 21 2018

Synopsis
High pressure building over the great lakes today moves east
over new england for Sunday and Monday, then off to the east
Tuesday. This will bring our area dry weather and gradually
rising temperatures. Wet and breezy weather forecast midweek.

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

Near term until 6 pm this evening
High pressure over the great lakes with a diminishing pressure
gradient over southern new england. Sunshine will generate some
mixing, reaching to about 850 mb. Also today the models show a
weak shortwave moving through the northeast and supported by a
120 knot upper jet.

Morning temps at or below freezing will quickly recover this
morning. Winds in the mixed layer will support developing gusts
around 20 knots midday and afternoon. There is enough of a
gradient to maintain a west to northwest wind. Temperatures at
850 mb reach -2c to -4c, and when mixed to the surface this
would support MAX temps in the 50s.

Short term 6 pm this evening through 6 pm Sunday
As the high pressure moves overhead, winds will become light and
subsidence should make our skies clear. With dew points in the
20s, except 30-35 CAPE and islands, expect some areas away from
the coast will dip below freezing, the rest will be in the 30s.

The high maintains clear skies and light winds Sunday. This will
allow sea breezes along the coast late morning through
afternoon. Mixing will support MAX temps in the mid 50s to
around 60.

Long term Sunday night through Friday
* highlights...

- warm up 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 and model preferences...

defined ridging is expected to define the sensible wx early
this coming week, with height anomalies finally becoming
positive by early mon. H85 temps respond as well, reaching above
0c and likewise, positive anomalies. However, will need to
watch a developing trof just W of the continental divide, a
response to enhanced ridging along the W coast of the pacnw and
bc. This wave shifts rapidly E through the early portion of the
week and looks to phase with a slowly meandering S stream
cutoff. This phasing will bring about a return to longwave trof
across the e, and yield a return to unsettled and wetter wx
reinforced yet again by a secondary shortwave out of the nw
territories late week. Recent runs are struggling somewhat with
the sfc low pres development track with the leading wave. This
is likely due to the fact it will not be fully developed or
sampled until sun. Given this, will lean most heavily on
ensemble means to account for differences in final outcomes.

Details...

mon and tue...

as mentioned above, ridging remains in control. H85 temps rise
above 0c, to an average near +3c mon, then +5c on tue. This
should allow several locations to reach the 60s. Can't rule out
a stray 70f, but noting strong subsidence inversion which may
limit mixing. Also, with weak flow under cresting high pres and
ssts still in the low-mid 40s, sea breezes are likely especially
mon, but also possible tue. This will lead to strong coastal
temp gradient. Cool overnights with radiational cooling.

Wed...

low pres develops across out of the cold pool from remnant
convection across the SE conus. Depending on how quickly the
wave aloft deepens, the low will either track more n, or E with
time. This is where the uncertainty in rainfall totals on wed
reside. The E track would usurp the available moisture and shift
strongest LLJ to the S while a deeper trof would draw the
parent low moisture dynamics N toward new england. Ensemble
means still favor the former over the latter, so this update
will feature this solution, but this will need to be watched. In
either case, pwats and LLJ nearly 2 std deviation above normal
as well as a conditionally unstable profiles suggest at least a
risk for periods of moderate to heavy rain unless the E track
verifies. Low probs of QPF near 1.00 suggested.

Thu and fri...

the depth of the wave will also define sensible wx details on
thu and fri. If the trof deepens later (the low pres E track
suggested above), then Thu could feature continued wet and
unsettled wx. Otherwise a brief period of meso-ridging will
follow. Whether this occurs on Thu and Fri or Fri only is still
somewhat uncertain. With a developing longwave trof and some
moisture clouds shra possible either day, but pops will be
generally lower than wed.

Next weekend...

as mentioned in the overview, a secondary trof will be moving
across the CONUS and merging with the longwave trof, deepening
it across the e. This may lead to another round of wetter and
cooler than normal conditions, but this is of course toward the
end of most deterministic ensemble skill set.

Aviation 08z Saturday through Wednesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... High confidence.

Today... VFR. Patchy daytime clouds this afternoon, but with
bases above 4500 feet. Northwest winds with gusts around 20
knots midday and afternoon, diminishing by evening.

Tonight and Sunday... VFR. Mainly clear skies and winds less
than 20 knots. Developing sea breezes Sunday late morning and
afternoon.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Sunday night through Wednesday ... High confidence.

Sunday night:VFR.

Monday through Tuesday:VFR.

Tuesday night: mainlyVFR. Chance ra late.

Wednesday: mainly MVFR, 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 Sunday ... High confidence.

Northwest winds gusting to 20 knots today, then lighter winds
tonight and Sunday. Seas remain below 5 feet through the
weekend.

Outlook Sunday night through Wednesday ... High confidence.

Sunday night through Tuesday: winds less than 25 kt and weak
seas.

Tuesday night: winds less than 25 kt and weak seas. Slight
chance of rain.

Wednesday: winds less than 25 kt. Seas locally approaching
5 ft. Rain likely, rain showers likely.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Wtb doody
near term... Wtb
short term... Wtb
long term... Doody
aviation... Wtb doody
marine... Wtb doody


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWPR1 - 8452660 - Newport, RI 7 mi44 min NNW 6 G 8 40°F 42°F1025.8 hPa (+0.8)
QPTR1 - 8454049 - Quonset Point, RI 10 mi50 min WNW 8.9 G 12 39°F 45°F1026.1 hPa
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 14 mi44 min NW 5.1 G 11 39°F 1025.8 hPa (+0.7)
NAXR1 - Narragansett Bay Reserve, RI 14 mi59 min NW 5.1 38°F 1003 hPa28°F
CPTR1 - 8452944 - Conimicut Light, RI 20 mi44 min NW 11 G 12 39°F 44°F1025.8 hPa (+0.9)
BUZM3 - Buzzards Bay, MA 21 mi44 min NW 14 G 15 40°F 1026.2 hPa (+0.7)
FRXM3 22 mi56 min 40°F 28°F
FRVM3 - 8447386 - Fall River, MA 23 mi44 min 40°F 45°F1026.1 hPa (+0.8)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 23 mi44 min WNW 7 G 9.9 40°F 1025 hPa (+0.8)
PVDR1 24 mi44 min NW 5.1 G 11 38°F 1026 hPa (+0.7)26°F
FOXR1 - 8454000 - Providence, RI 25 mi44 min N 5.1 G 8.9 39°F 43°F1025.5 hPa (+0.8)
NLNC3 - 8461490 - New London, CT 35 mi44 min N 1.9 G 5.1 38°F 43°F1026.8 hPa (+0.8)
LDLC3 - New London Ledge CT - Ledge Light Weather 36 mi34 min NNW 8.9 G 12 38°F 26°F
44097 - Block Island, RI (154) 36 mi31 min 41°F3 ft
MTKN6 - 8510560 - Montauk, NY 39 mi44 min 40°F 44°F1027 hPa (+0.8)
BZBM3 - 8447930 - Woods Hole, MA 41 mi44 min 40°F 44°F1025.1 hPa (+0.7)
WAXM3 - Waquoit Bay Reserve, MA 49 mi59 min 4.1 40°F 1025 hPa29°F

Wind History for Newport, RI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Newport, Newport State Airport, RI11 mi51 minNW 610.00 miFair38°F28°F68%1025.6 hPa
Block Island State Airport, RI20 mi48 minNW 710.00 miFair38°F28°F68%1027.1 hPa
Providence, Theodore Francis Green State Airport, RI20 mi53 minNW 610.00 miFair39°F27°F62%1026.1 hPa
Westerly, Westerly State Airport, RI21 mi51 minVar 410.00 miFair38°F27°F65%1026.6 hPa

Wind History from UUU (wind in knots)
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1 day agoSE3CalmN4NE4NE8N8N8CalmN3N6NW7W10NW7W7NW9NW10
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SW76--3SW33CalmW3CalmCalmSE3

Tide / Current Tables for Watson Pier, Boston Neck, Narragansett Bay, Rhode Island
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Watson Pier
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Sat -- 12:22 AM EDT     3.94 feet High Tide
Sat -- 12:40 AM EDT     Moonset
Sat -- 05:56 AM EDT     Sunrise
Sat -- 06:28 AM EDT     0.12 feet Low Tide
Sat -- 10:32 AM EDT     Moonrise
Sat -- 12:59 PM EDT     3.35 feet High Tide
Sat -- 06:21 PM EDT     0.08 feet Low Tide
Sat -- 07:32 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.93.83.22.21.20.50.20.20.30.61.32.233.43.12.31.30.50.10.20.50.91.52.3

Tide / Current Tables for Westport River Entrance, Massachusetts Current
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Westport River Entrance
Click for Map
Sat -- 12:39 AM EDT     Moonset
Sat -- 01:06 AM EDT     -0.00 knots Slack
Sat -- 03:42 AM EDT     -2.94 knots Max Ebb
Sat -- 05:55 AM EDT     Sunrise
Sat -- 06:58 AM EDT     0.00 knots Slack
Sat -- 10:31 AM EDT     Moonrise
Sat -- 11:12 AM EDT     2.02 knots Max Flood
Sat -- 01:46 PM EDT     -0.00 knots Slack
Sat -- 04:14 PM EDT     -2.73 knots Max Ebb
Sat -- 07:31 PM EDT     Sunset
Sat -- 07:44 PM EDT     0.00 knots Slack
Sat -- 11:48 PM EDT     1.61 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.30.2-1.4-2.7-2.9-2.2-100.81.41.821.91.1-0.4-1.9-2.7-2.5-1.6-0.60.20.81.21.5

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 (5,6,7,8)
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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.