Sunday, September27, 2020
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Marine Weather and Tides
Westerly, RI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:39AMSunset 6:36PM Sunday September 27, 2020 1:58 AM EDT (05:58 UTC) Moonrise 5:06PMMoonset 2:08AM Illumination 75% Phase: Waxing Gibbous; Moon at 10 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- 116 Am Edt Sun Sep 27 2020
Rest of tonight..SE winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 nm.
Sun..SE winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog. Vsby 1 nm or less.
Sun night..S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Mon..S winds around 10 kt. Seas 3 to 4 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Mon night..S winds around 10 kt. Seas 3 to 4 ft.
Tue..S winds around 10 kt. Seas 3 to 4 ft. A chance of showers.
Tue night..S winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 5 ft. Showers likely.
Wed and Wed night..SW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 7 ft. Showers.
Thu and Thu night..W winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. A chance of showers. 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 116 Am Edt Sun Sep 27 2020
Synopsis for massachusetts and rhode island coastal waters.. High pressure will be centered south of the waters through tomorrow. Small craft advisories may be needed beginning Monday. Southerly wind will prevail through mid week. Stronger wind gusts will be possible Tuesday and Wednesday ahead of a cold front. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo .


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 270218 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1018 PM EDT Sat Sep 26 2020

SYNOPSIS. Mild and humid the rest of the weekend, with fog and low clouds tonight. Possibly a couple of showers Sunday night. Early next week will feature increasingly moist southerly flow out ahead of a cold front, bringing showers Monday and Tuesday. The greatest chance of rain comes with a series of frontal systems around Wednesday/Thursday. Temperatures will be near or a little above normal until that front cools things down by late week.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. Latest satellite fog product had a great handle on progress of stratus late this evening. Main changes to the forecast this evening were to timing this stratus north. Also still monitoring fog development overnight. Thus far, just the low clouds were dominating, with not much restriction to surface visibility. Expecting this to change for some locations after midnight. Minor adjustments to temperatures also to reflect observed trends.

730 PM Update .

Increased sky cover based on latest satellite observations. Have also decreased visibilities across southern New England toward the latest GLAMP/NBM guidance. Cannot rule out the need for a Dense Fog Advisory in future updates especially across the south coast. Am not confident enough in how widespread 1/4 mile or less is at this point in time.

Previous discussion .

Weak shortwave from the Mid-Atlantic states moves across Srn New England this evening. This will bring a period of clouds during the evening/early night. The airmass below the clouds is relatively dry. Supporting jets remain north and south of Srn New England and not in position to generate any lift. This suggests dry weather, but can't rule out an isolated shower. The chance will diminish as the upper shortwave moves off to the east early tonight.

The other concern is the return of fog/low clouds similar to last night. Dew points this afternoon were in the 50s, but the airmass moving up with the shortwave shows dews in the upper 50s to lower 60s. So min temps should be a little milder than last night . in the upper 50s to mid 60s. The small difference between temps and dew points will support another round of fog/low clouds.

SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/. Shortwave ridge builds over Srn New England Sunday. This should bring a dry weather day with the fog thinning and sunshine returning during the morning and midday. Mixing is expected to reach between 850-mb and 900-mb. Temperatures in this range are supportive of max sfc temps 75 to 80, similar to today.

Shortwave moves up in the southwest upper flow Sunday night. The shortwave will be supported by a weak 60-kt jet, but positions to our west, placing Srn New England in the right entrance region and possibly generating some lift. A 30-kt low-level southerly jet will bring increasing moisture. So expect 30-35 pct pops for showers during the night. Amounts from any showers should be light, generally less than 1/10 inch. Dewpoints will inch up a little higher, so overnight lows will be in the low to mid 60s.

LONG TERM /MONDAY THROUGH SATURDAY/. Highlights .

- Above normal temperatures persist through Tuesday - Series of fronts will produce rain chances Wednesday through Friday - Cooler temperatures settle in (more seasonable) late next week

Monday-Wednesday

On Monday, a highly amplified upper-level trough will dig into the Central Plains and slowly progress eastward. Meanwhile, our area will continue to be dominated by moderate southerly flow associated with a high pressure system centered to our east over the Atlantic waters. This southerly flow will result in moist conditions as well as temperatures 10-15 degrees above the climatological normal through Tuesday evening.

On Monday afternoon a short-wave trough and associated vorticity max originating from the Gulf of Mexico will propagate over the region. With plenty of moisture in place (PWAT > 1.5" in some areas) this weak forcing should be enough to produce a few scattered showers. Currently, guidance is leaning towards the best rain chances being over western MA/CT and the Cape/Islands.

By Tuesday, a cold front associated with the aforementioned trough over the Central US will approach the east coast. Existing deep layer moisture and positive differential vorticity advection supportive of forcing for ascent will result in a chance for scattered showers ahead of the front on Tuesday afternoon.

Tuesday night into Wednesday, the cold front moves through the region producing much needed widespread precipitation. There's some uncertainty in how much rain we'll actually see, but forecast amounts are expected to be higher across the western zones (1+") with 0.5-1" across the eastern/coastal zones.

Thursday-Saturday

Discrepancies between the GFS/ECMWF are creating a difficult forecast for Thursday as the ECMWF produces a cutoff-low over the southern states from the deeper trough over the central US. This disturbance then moves up the east-coast and produces more substantial rainfall on Thursday afternoon. The GFS on the other hand, absorbs this energy into the large-scale flow and ejects the disturbance from the region faster resulting in lower rain chances for Thursday afternoon. Since the ECMWF has been somewhat of an outlier with this solution, decided to lean more towards rain chances Thursday morning tapering off by the afternoon.

By Friday, cooler, more seasonable temperatures settle into the region behind the cold front during the day, followed by yet another front and chance of precipitation on Friday night. High pressure builds in behind the front, along with cooler more fall like temperatures for next weekend.

AVIATION /02Z SUNDAY THROUGH THURSDAY/. Forecaster Confidence Levels .

Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

Tonight . Moderate confidence.

Fog and low clouds moving in tonight. Many areas still VFR north of the Mass Pike and across the Cape and islands this evening. MVFR/IFR already in place across most of CT and RI, and spreading north across interior MA. Should see conditions deteriorating to IFR and even some LIFR ceilings. Will have fog development as well, potentially dense at times along the south coast and up the CT River Valley.

Sunday . Moderate confidence.

MVFR/IFR with fog lifting by mid morning. Could take a bit longer in some spots to see improvement to VFR. Lowest conditions will be along the south coast.

Sunday night . Moderate confidence.

MVFR to IFR ceilings anticipated as showers move up from the Mid Atlantic. Could see brief reductions to MVFR visibility if any heavier showers move through.

KBOS Terminal . High confidence in TAF trends. Moderate confidence in timing. SW to SSW winds late tonight should keep visibility around 3-5SM, but should see the low ceilings move in.

KBDL Terminal . High confidence in TAF trends. Moderate confidence in timing. Outlook /Monday through Thursday/ .

Monday: MVFR/IFR conditions possible. Chance SHRA.

Monday Night: Mainly VFR, with local MVFR possible. Slight chance SHRA.

Tuesday: Mainly MVFR, with areas VFR possible. Breezy. Chance SHRA.

Tuesday Night through Wednesday: Mainly MVFR, with local IFR possible. Breezy. SHRA likely.

Wednesday Night: Mainly MVFR, with areas VFR possible. Breezy. SHRA likely.

Thursday: Mainly VFR, with areas MVFR possible. Breezy. Chance SHRA.

MARINE. Light winds and seas continue through Sunday due to circulation around high pressure centered near Bermuda. Expect fog to redevelop tonight with low clouds and areas of poor visibility. Clouds and fog lift once again Sunday morning with dry weather through the rest of the day.

A disturbance moving up from the Mid Atlantic coast will bring a chance of showers Sunday night. Expect increasing south winds and building seas. Seas may reach 5 feet on some of the southern waters Sunday night. A Small Craft Advisory may be needed.

Outlook /Monday through Thursday/ .

Monday: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers.

Monday Night: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers.

Tuesday: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers.

Tuesday Night: Winds less than 25 kt. Seas up to 5 ft. Rain showers likely.

Wednesday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 9 ft. Rain showers likely.

Wednesday Night: Winds less than 25 kt. Rough seas up to 9 ft. Rain showers likely.

Thursday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain showers.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . None.

SYNOPSIS . WTB/BL/RM NEAR TERM . WTB/Belk/BL SHORT TERM . WTB LONG TERM . RM AVIATION . BL MARINE . WTB/RM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 14 mi49 min E 8 G 8.9 67°F 1018.6 hPa66°F
NLNC3 - 8461490 - New London, CT 14 mi65 min E 1 G 1.9 68°F 1017.2 hPa
MTKN6 - 8510560 - Montauk, NY 24 mi65 min 66°F 1017.6 hPa
QPTR1 - 8454049 - Quonset Point, RI 27 mi65 min Calm G 0 66°F 1017.9 hPa
NWPR1 - 8452660 - Newport, RI 28 mi65 min E 1.9 G 4.1 67°F 1017.9 hPa
NAXR1 - Narragansett Bay Reserve, RI 32 mi74 min Calm 66°F 1018 hPa65°F
PRUR1 32 mi65 min 67°F 67°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 32 mi65 min ENE 1 G 1.9 66°F 1018.7 hPa
CPTR1 - 8452944 - Conimicut Light, RI 35 mi65 min E 1.9 G 2.9 65°F 1017.7 hPa
FOXR1 - 8454000 - Providence, RI 37 mi65 min S 5.1 G 6 67°F 1018.1 hPa
PVDR1 37 mi65 min SSE 5.1 G 5.1 67°F 1018.3 hPa66°F
FRXM3 41 mi65 min 66°F 66°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 41 mi65 min SSE 2.9 G 5.1 67°F 1018.2 hPa
FRVM3 - 8447386 - Fall River, MA 42 mi65 min 66°F 1018.7 hPa
BUZM3 - Buzzards Bay, MA 42 mi59 min SE 4.1 G 5.1 1018.7 hPa (-1.0)
44097 - Block Island, RI (154) 47 mi63 min 64°F2 ft
44017 - 23 Nautical Miles Southwest of Montauk Point, NY 49 mi39 min SSE 1.9 G 3.9 66°F 67°F1017.3 hPa65°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 mi66 minN 09.00 miOvercast66°F63°F90%1017.7 hPa
Groton / New London, Groton / New London Airport, CT12 mi63 minE 310.00 miOvercast68°F66°F93%1017.3 hPa
Block Island State Airport, RI19 mi63 minS 410.00 miPartly Cloudy65°F64°F100%1017.9 hPa
Montauk, Montauk Airport, NY21 mi65 minN 0 mi63°F61°F93%1017.9 hPa

Link to 5 minute data for KWST

Wind History from WST (wind in knots)
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Last 24hrCalmCalmCalmCalmN3NE3CalmCalmSE3SE7SE7S6S5S4SE4SE5SE6E4CalmCalmCalmNE3NE3Calm
1 day agoCalmCalmCalmCalmCalmCalmCalmSW3SW5SW7SW5SW8SW7SW7S7S6S4SW4SW5S4S4CalmSW3Calm
2 days agoCalm3CalmCalmCalmCalmCalmCalmNW3W5SW7SW7SW10SW10SW7SW4SW4SW4SW3SW4CalmCalmCalmCalm

Tide / Current Tables for Westerly, Pawcatuck River, Rhode Island
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Westerly
Click for Map
Sun -- 01:01 AM EDT     0.38 feet Low Tide
Sun -- 02:08 AM EDT     Moonset
Sun -- 06:40 AM EDT     Sunrise
Sun -- 06:52 AM EDT     2.61 feet High Tide
Sun -- 01:14 PM EDT     0.53 feet Low Tide
Sun -- 05:05 PM EDT     Moonrise
Sun -- 06:35 PM EDT     Sunset
Sun -- 07:08 PM EDT     3.02 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.40.611.62.12.52.62.52.31.91.40.80.50.71.11.72.32.832.92.72.31.7

Tide / Current Tables for The Race, Long Island Sound, New York Current
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The Race
Click for Map
Sun -- 02:09 AM EDT     Moonset
Sun -- 03:01 AM EDT     0.00 knots Slack
Sun -- 06:07 AM EDT     2.38 knots Max Flood
Sun -- 06:41 AM EDT     Sunrise
Sun -- 09:10 AM EDT     -0.00 knots Slack
Sun -- 12:05 PM EDT     -2.62 knots Max Ebb
Sun -- 03:20 PM EDT     0.00 knots Slack
Sun -- 05:06 PM EDT     Moonrise
Sun -- 06:25 PM EDT     2.46 knots Max Flood
Sun -- 06:36 PM EDT     Sunset
Sun -- 09:29 PM EDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.8-2.3-1.4-01.32.12.42.21.50.2-1.1-2.2-2.6-2.4-1.6-0.50.91.92.42.41.80.7-0.8-2.1

Weather Map
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wmap_A
GEOS Local Image of    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Boston, MA
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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 numerous 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.