Monday, September20, 2021
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Marine Weather and Tides
Weekapaug, RI

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:31AMSunset 6:49PM Monday September 20, 2021 2:42 AM EDT (06:42 UTC) Moonrise 7:05PMMoonset 5:53AM Illumination 98% Phase: Waxing Gibbous; Moon at 14 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- 127 Am Edt Mon Sep 20 2021
Rest of tonight..NE winds around 5 kt. Seas around 2 ft.
Mon..E winds 5 to 10 kt. Seas around 2 ft.
Mon night..SE winds around 10 kt. Seas 2 to 3 ft.
Tue..SE winds around 10 kt. Seas 2 to 3 ft.
Tue night through Wed night..SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Thu and Thu night..SE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. A chance of showers.
Fri and Fri night..S winds around 10 kt, becoming w. Gusts up to 20 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 127 Am Edt Mon Sep 20 2021
Synopsis for massachusetts and rhode island coastal waters.. High pressure remains anchored from the maritimes to new england through mid week, providing tranquil boating conditions. By late next week, a cold front approaches new england from the west, and will be accompanied by scattered showers, with locally heavy rain possible and isolated Thunderstorms. 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 Weekapaug, RI
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location: 41.33, -71.76     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 200555 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 155 AM EDT Mon Sep 20 2021

SYNOPSIS. Large high pressure remains over New England Monday and Tuesday, bringing dry weather with mild days and cool nights. The high begins to drift offshore Wednesday, with increasing humidity and scattered showers possible. A slow moving frontal system approaching from the west will be accompanied by widespread showers at times Thursday into Friday. Improving conditions expected Saturday but a few showers could linger in eastern Massachusetts and Rhode Island.

NEAR TERM /UNTIL 6 AM THIS MORNING/.

2 AM update .

Temps falling thru the 50s with MVY the coolest location at 46! Previous forecast remains on track, thus no changes with this update. Earlier discussion below.

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Chilly night ahead, especially outside of the urban areas where temps are already down in the 50s. 1024 mb high over VT is providing a dry airmass, light winds and clear conditions. Hence, ideal radiational cooling conditions. Previous forecast is for many suburbs to fall into the 40s overnight, with 50s in the urban areas. These temps remain on track, thus no change to previous forecast.

SHORT TERM /6 AM THIS MORNING THROUGH 6 PM TUESDAY/.

Monday .

Anomalous 592 Dm high builds into New England and becomes centered over our area. This is 99.5th percentile according to the NAEFS Situational Awareness Table. Nonetheless, daytime highs should be near or just above climatological normal due to southeast winds as 1028mb surface high slides just offshore. With 925mb temperatures +12 to +14C, expect low 70s near the coast and mid to upper 70s in the interior locations. Due to subsidence inversion, expect plentiful sunshine with a few mid to high level clouds filtering in from the southwest during the afternoon hours. That is associated with weak disturbances associated with the remnants of Tropical Cyclone Nicholas getting caught in the weakness between the 592 Dm ridge centered over the Northeast US and an approaching amplifying H5 trough from the Great Plains.

An interesting statistic is that Boston has never failed to record a sub-70 degree high past September 20. The latest first sub-70 degree high heading into astronomical fall is September 20 1947. With southeast flow and SSTs in the mid 60s, it will be a close call whether Boston will officially hit 70 degrees, given that the climate site is just off the waters at Logan Airport. Have gone with a maximum forecast of 70 degrees, but it is a toss-up between 69 and 71F. We shall see if the record stands by the end of tomorrow!

Monday night .

Surface high slides further offshore, allowing winds to turn southerly. Dew points rise from the 40s into the 50s and along with increasing cloud cover, overnight lows will generally bottom out in the 50s, with mid to upper 50s near the coast and in the urban population centers. If cloud cover is less extensive, then upper 40s in the typical cool spots like the MA coastal plains are possible.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/.

Highlights .

* Mainly dry and seasonably mild Tue/Wed * Scattered showers at times Thu into Fri and continued mild * Improving conditions Sat, but showers may linger in the east

Tuesday into Wednesday .

Strong mid level ridge over New Eng shifts to east on Wed while surface high remains sets up east of Nova Scotia with ridging extending west into SNE. Dry and seasonably mild weather Tue with sunshine mixing with some lower strato-cu as persistent SE flow brings a shallow layer of low level moisture. Then Wed, some of the guidance is indicating a few showers developing in the interior as low level moisture deepens a bit. Given that large scale forcing is limited with ridging nearby and lots of dry air in the mid levels, much of the day should be dry with just a low risk for a few showers in the interior. Temps Wed will be a bit milder with highs mid/upper 70s

Thursday into Friday .

Models are similar in the overall pattern with high amplitude trough/mid level low across the Gt Lakes opening up and lifting to the NE into eastern Canada as strong ridge persists to the east. As a result of the amplified pattern, there is consensus of a slow moving front approaching from the west with deep southerly flow across New Eng. Shower chances will increase during this period. Expect scattered showers Thu, especially in the west but given that best forcing remains to the west with neutral to slightly rising heights not expecting widespread showers and it may remain mostly dry in eastern New Eng Thu. The most likely period for numerous showers and a few t-storms will be Fri as low level jet and accompanying PWAT plume moves into region ahead of the frontal system. While some heavier rainfall is possible, the axis of heaviest rainfall is expected to be north and west of SNE. Temps will be in the 70s Thu/Fri with humid conditions as dewpoints will be well into the 60s.

Saturday and Sunday .

Low confidence forecast next weekend as there are differences on the amplitude of the upstream trough across the Gt Lakes which impacts the timing of the front moving offshore. GFS and ECMWF suggest improving conditions Sat, but many EC ensemble members have showers lingering on Sat with front stalling near eastern New Eng. Will maintain chc pops in the east on Sat but lots of uncertainty. For Sunday, we went with dry forecast in NW flow, but can't rule out more showers assocd with a shortwave passage. Seasonable temps expected next weekend as there is not push of colder air. In fact, ensemble mean 850 mb temps 10-12C.

AVIATION /06Z MONDAY THROUGH FRIDAY/. Forecaster Confidence Levels.

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

06z Update . high confidence thru Tue.

Today . VFR, dry weather and light winds, becoming onshore during the afternoon. Patchy fog in the interior valleys and low lying terminals near shore.

Tonight . VFR, dry weather and light winds. Patchy fog in the interior valleys and low lying terminals near shore.

Tuesday . VFR, dry weather and SE winds. VFR cloud bases possible across CT into western-central MA, possibly RI.

KBOS Terminal . High confidence. VFR.

KBDL Terminal . High confidence. VFR.

Outlook /Tuesday night through Thursday/

Tuesday Night: Mainly VFR, with local IFR possible.

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

Wednesday Night: Mainly MVFR, with local IFR possible. Breezy. Chance SHRA.

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

Friday: Mainly MVFR, with local VFR possible. Breezy. Chance SHRA, isolated TSRA.

MARINE. Forecaster Confidence Levels.

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

340 PM update .

Rest of today . High forecast confidence.

High pressure builds into New England, with NNE winds 10-15 kt and isolated 20 kt gusts diminishing by this evening. 5-7 ft seas and SE swells from Odette will diminish after midnight. Remaining Small Craft Advisories are scheduled to come down after midnight.

Tonight and Monday . High forecast confidence.

Large 1025+ mb high pressure builds over the maritimes, yielding fine boating weather with light winds, dry weather and good vsby.

Monday night . Winds shift to the south at 5-10 kt with localized reduced vsby due to patchy fog possible.

Outlook /Tuesday Night through Friday/ .

Tuesday: Winds less than 25 kt.

Tuesday Night: Winds less than 25 kt. Seas locally approaching 5 ft.

Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft.

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

Thursday Night: Winds less than 25 kt. Areas of rough seas. Chance of rain showers.

Friday: Winds less than 25 kt. Rough seas up to 7 ft. Chance of rain showers, isolated thunderstorms.

CLIMATE. The latest first sub-70 degree high heading into astronomical fall for BOS is September 20 1947. It is possible we may break the record by tomorrow.

The latest first sub-70 degree high heading into astronomical fall for PVD is September 26 2015.

Both BDL and ORH have already recorded sub-70 degree highs earlier this month.

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

SYNOPSIS . KJC/Chai NEAR TERM . Nocera SHORT TERM . Chai LONG TERM . KJC AVIATION . KJC/Nocera MARINE . KJC/Chai CLIMATE . Chai


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 17 mi62 min NE 1.9 G 1.9 63°F 1023.4 hPa40°F
NLNC3 - 8461490 - New London, CT 18 mi54 min 60°F 71°F1025.3 hPa
MTKN6 - 8510560 - Montauk, NY 22 mi54 min 62°F 71°F1024.7 hPa
NWPR1 - 8452660 - Newport, RI 26 mi54 min E 4.1 G 5.1 62°F 70°F1024.9 hPa
QPTR1 - 8454049 - Quonset Point, RI 26 mi54 min NW 1 G 1 62°F 71°F1025.3 hPa
PRUR1 31 mi54 min 60°F 54°F
NAXR1 - Narragansett Bay Reserve, RI 31 mi117 min WSW 1.9 56°F 1025 hPa54°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 31 mi54 min Calm G 0 59°F 1025.9 hPa
CPTR1 - 8452944 - Conimicut Light, RI 35 mi54 min 61°F 71°F1025.1 hPa
PVDR1 37 mi54 min Calm G 1 60°F 1025.5 hPa
FOXR1 - 8454000 - Providence, RI 38 mi54 min Calm G 0 60°F 67°F1025.5 hPa
BUZM3 - Buzzards Bay, MA 39 mi42 min E 6 G 7 1025.7 hPa (+0.9)
FRXM3 40 mi54 min 59°F 59°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 40 mi54 min Calm G 1.9 62°F 1025.4 hPa
FRVM3 - 8447386 - Fall River, MA 41 mi54 min 61°F 70°F1025.4 hPa
44097 - Block Island, RI (154) 42 mi46 min 71°F3 ft
44017 - 23 Nautical Miles Southwest of Montauk Point, NY 47 mi42 min ESE 5.8 G 7.8 68°F 71°F1024.7 hPa55°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 mi49 minN 010.00 miFair53°F53°F100%1024.9 hPa
Groton / New London, Groton / New London Airport, CT15 mi46 minN 310.00 miFair55°F55°F100%1024.5 hPa
Montauk, Montauk Airport, NY19 mi48 minN 0 mi58°F54°F87%1025 hPa

Link to 5 minute data for KWST

Wind History from WST (wind in knots)
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N6N9N6N7N44CalmS6CalmCalmCalmCalmCalmCalmCalmCalm
1 day agoN6N6N7N5N7N9N10N8N8N63SE5S7S5S5S5S5S3S3S3CalmCalmCalmN6
2 days agoNE5NE6NE5N6NE7N6NE6NE5NE6NE76NE8NE8NE7NE7NE7NE4N7N7N4NE7N5N7N5

Tide / Current Tables for Watch Hill Point, Rhode Island
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Watch Hill Point
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Mon -- 02:57 AM EDT     -0.10 feet Low Tide
Mon -- 05:53 AM EDT     Moonset
Mon -- 06:33 AM EDT     Sunrise
Mon -- 08:43 AM EDT     3.05 feet High Tide
Mon -- 03:15 PM EDT     -0.14 feet Low Tide
Mon -- 06:47 PM EDT     Sunset
Mon -- 07:05 PM EDT     Moonrise
Mon -- 07:54 PM EDT     Full Moon
Mon -- 09:04 PM EDT     3.07 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.50.1-0.10.10.71.52.42.932.721.30.60.1-0.1-00.41.22.12.83.12.92.3

Tide / Current Tables for The Race, Long Island Sound, New York Current
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The Race
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Mon -- 02:26 AM EDT     -3.49 knots Max Ebb
Mon -- 05:42 AM EDT     0.00 knots Slack
Mon -- 05:54 AM EDT     Moonset
Mon -- 06:33 AM EDT     Sunrise
Mon -- 08:39 AM EDT     3.10 knots Max Flood
Mon -- 11:50 AM EDT     -0.00 knots Slack
Mon -- 02:48 PM EDT     -3.42 knots Max Ebb
Mon -- 06:03 PM EDT     0.00 knots Slack
Mon -- 06:48 PM EDT     Sunset
Mon -- 07:06 PM EDT     Moonrise
Mon -- 07:54 PM EDT     Full Moon
Mon -- 08:57 PM EDT     3.07 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1-2.6-3.4-3.4-2.6-1.20.52.12.93.12.51.4-0.3-2-3.1-3.4-2.8-1.7-0.11.62.73.12.71.8

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