Wednesday, April8, 2020
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Marine Weather and Tides
Westerly, RI

Version 3.4
NOTICE
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 6:16AMSunset 7:21PM Wednesday April 8, 2020 2:21 PM EDT (18:21 UTC) Moonrise 8:14PMMoonset 6:56AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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 Pm Edt Wed Apr 8 2020
.gale watch in effect from late Thursday night through Friday evening...
This afternoon..NE winds 5 to 10 kt. Seas 1 foot or less.
Tonight..S winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 to 3 nm.
Thu..SE winds 10 to 15 kt, becoming S 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 5 to 8 ft. Patchy fog. Showers with a chance of tstms. Vsby 1 to 3 nm.
Thu night..W winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 35 kt. Seas 6 to 9 ft. Showers likely.
Fri and Fri night..W winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 7 ft.
Sat..W winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Sat night..NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Sun..SW winds 10 to 15 kt. Seas around 2 ft.
Sun night..S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers. Winds and seas higher in and near tstms. 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 Pm Edt Wed Apr 8 2020
Synopsis for massachusetts and rhode island coastal waters.. Low pressure south of new england early Wednesday exits into georges bank Wednesday afternoon and then out to sea. A strong cold front crosses new eng Thu afternoon and evening. Low pres develops on this front in new england, intensifying as it moves into the gulf of maine Thu night then into the maritimes Fri. High pressure will be centered southeast of the waters for Sat. 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 081725 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 125 PM EDT Wed Apr 8 2020

SYNOPSIS. Weak area of low pressure tracking over or just south of New England will spread a period of rain across the region this morning. As the low departs a drying trend develops this afternoon along with a few breaks of sunshine late in the day. Another system moves in Thursday, bringing more rain and scattered thunderstorms. Scattered showers are possible Thursday night through Friday. Drier weather for this weekend before our next wet weather system early next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

115 PM Update .

Rain from this morning has now pushed offshore, but with a stationary front nearby, there are plenty of clouds across the region. Per visible satellite, areas north of the MA turnpike have seen some partial clearing from W to E. Temperatures have also responded accordingly, with interior locations rising into the mid and upper 50s. Nearer to the coast, however, the offshore low has helped set up a NE flow. With the low levels adequately saturated, this has led to a push of broken marine stratus from the Gulf of Maine towards the MA South Shore. And along with the cold ocean temps, temperatures near the coast will only reach the upper 40s to low 50s.

Previous discussion .

1040 AM Update . We made two main changes to the near- term forecast. Firstly, the back edge of the main precipitation shield is moving out to sea a little faster so we adjusted the PoPs accordingly. Secondly, we bumped the temperatures up especially across interior MA and CT. There could be some breaks in the clouds for some inland locations, especially along the lower CT River valley to reach the upper 50s or even 60 late this afternoon. Otherwise, the rest of the forecast remains on track.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/. Tonight .

Weak short wave ridging provides the region with dry weather and seasonable temperatures. Given light winds and dew pts 35-40 (at or above the average nighttime lows), risk for patchy fog especially along the coast where highest dew pts will be observed.

Thursday .

Closed low just north of the Great Lakes into southern Ontario ejects a very strong short wave into New England during the afternoon. Very strong jet dynamics with this system that induces 979 mb triple pt/secondary over northeast MA around 21z Thu. Strong cyclonic curvature to the mid/upper level flow coupled with PWAT plume of 1+ inches and steep mid level lapse rates suggest a good bet for elevated convection and brief heavy showers. In fact could be a fine line of low top convection. Key for surface based convection will be how far north does warm sector track before triple pt low pinches off warm sector from advecting northward. Some of the high res guidance hint at warm sector briefly advecting into RI and eastern MA with surface temps and dew pts climbing into the 50s! Some of the guidance has trended farther north-northeast with triple pt/secondary low. This would result in warm sector surging farther north increasing the threat of strong to severe storms. SPC Day 2 forecast has also trended northward with marginal risk now into NYC area. Will just have to watch how this evolves. As of now SB instability appears to be lacking.

Breezy conditions will develop in the warm sector late Thu morning into Thu afternoon with south winds 10-15 mph gusting up to 25-35 mph at times, then abruptly shifts to the west late in the day with the FROPA.

LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/. Highlights .

* Gusty winds, light rain, and high elevation snow on Friday with a few rumbles of thunder possible

* Potential for minor coastal flooding through early Friday around high tide across the east and south coasts of MA and RI. See the Tides and Coastal Flooding section below for more details.

* Temperatures running near to below normal through Saturday, then a warm up Sunday- Tuesday

* Rain and gusty winds return Monday

Details .

Thursday night and Friday .

By late Thursday evening/early overnight hours the cold front will have exited offshore ushering in a drier airmass and leaving clearing skies in its wake. Strong jet dynamics remain, now out of the W/NW. This brings mid level CAA and steepening lapse rates, helping to mix down a strong 40-50 kt 850 mb LLJ. The strongest winds should remain aloft during the overnight hours, but with diurnal heating on Friday and the cold pool aloft the boundary layer should mix very well all the way up to at least 750 mb. This will allow for widespread very strong wind gusts to mix down, potentially necessitating a Wind Advisory or even a High Wind Warning; 40-50 mph gusts are likely.

Even though the sfc low will be well to our north, the upper low lingers overhead keeping cyclonic flow in place with wraparound moisture and the strong LLJ. This will mean scattered rain showers, especially during the day. This as diurnal heating of the sfc together with the cold pool aloft contribute to some sfc based instability which could bring about a thunderstorms or two as well.

Saturday and Sunday .

Nice weekend in store, though Sunday looks to be the nicer of the two days (warmer with less wind). A ridge of high pressure begins to move overhead early Saturday, and this means the pressure gradient will be slowly relaxing, so winds likely remain breezy on Saturday before calming Saturday night and Sunday. Temperatures remain in the low 50s on Saturday under NW flow on the downstream side of the ridge. By Sunday though, the ridge axis approaches and SW return flow warms us up into the upper 50s. Low temperatures on Sunday morning were trended toward the colder MOS guidance to account for likely radiational cooling under clear skies and light winds . into the upper 20s and low 30s.

Monday and Tuesday .

The mild temperatures continue on Monday and Tuesday. However, it comes with the return of widespread rain. A deep mid level trough and sfc low will bring rain and gusty winds around Monday, with another potentially wet disturbance right on its heels.

AVIATION /17Z WEDNESDAY THROUGH SUNDAY/. Forecaster Confidence Levels .

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

15z update .

Today: High confidence.

VFR conditions with light NE wind. Not expecting marine stratus due to low-level dry air.

Tonight: Moderate confidence.

MVFR to IFR conditions with areas of fog developing along the south coast. Light SE wind.

Thursday . strong cold front approaches the region and sweeps thru the area late in the day. Mainly MVFR but IFR possible in hilly terrain. Widespread showers developing west to east thru the day with a fine line of low top showers/thunderstorms possible along and ahead of the front. LLWS likely given magnitude of low level southerly jet. Strong wind shift late in the day with the frontal passage from south to west.

KBOS Terminal . High confidence in the TAF.

KBDL Terminal . High confidence in the TAF.

Outlook /Thursday Night through Sunday/ .

Thursday Night: VFR. Strong winds with local gusts up to 40 kt.

Friday: VFR. Strong winds with gusts up to 45 kt. Slight chance SHRA, isolated TSRA.

Friday Night: Mainly VFR, with local MVFR possible. Windy with gusts up to 35 kt.

Saturday through Saturday Night: VFR. Breezy.

Sunday: VFR.

MARINE. 15z update . Have issued a Coastal Flood Advisory for Boston Harbor and the MA South Coast to cover the upcoming high tide cycle around local noon for possible minor flooding. All other marine headlines remain unchanged.

This afternoon . weak surface low tracks eastward to Georges Bank this afternoon. Morning rain gives way to a drying trend in the afternoon. Light SSW winds become NE this afternoon.

Tonight . Weak high pressure over the waters provides dry quiet weather.

Thursday . strong cold front sweeps across the water late Thu with widespread showers and embedded thunder likely. Strong SSW winds ahead of the front abruptly shifts to the WNW and remains strong and gusty.

Outlook /Thursday Night through Sunday/ .

Thursday Night: Moderate risk for gale force winds with gusts up to 40 kt. Rough seas up to 11 ft. Slight chance of rain showers.

Friday: Moderate risk for gale force winds with gusts up to 40 kt. Rough seas up to 12 ft. Slight chance of rain showers, isolated thunderstorms.

Friday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas.

Saturday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas.

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

Sunday: Winds less than 25 kt.

TIDES/COASTAL FLOODING. 4 AM Update:

Next 4 tides (Midday and midnight today and Thursday) are astronomically high and run the risk of minor coastal flooding/inundation. Midday today and then midnight tonight main risk is eastern MA and again tonight given light onshore flow. Then tomorrow with southerly surface winds risk shifts to the south coast of MA/RI.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Coastal Flood Advisory until 8 AM EDT Friday for MAZ007-015- 016-019-022. RI . Coastal Flood Advisory from 8 PM this evening to 8 AM EDT Friday for RIZ002-004>007. MARINE . Gale Watch from Thursday afternoon through Friday evening for ANZ232-250-254-255. Gale Watch from late Thursday night through Friday evening for ANZ233>235-237-256. Gale Watch from Thursday afternoon through Friday afternoon for ANZ231-251.

SYNOPSIS . Nocera/BW NEAR TERM . Chai SHORT TERM . Nocera LONG TERM . BW AVIATION . Nocera/BW/Chai MARINE . Loconto/Chai TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NLNC3 - 8461490 - New London, CT 14 mi51 min N 5.1 G 11 50°F 46°F1000.8 hPa
LDLC3 - New London Ledge CT - Ledge Light Weather 14 mi41 min N 15 G 17 50°F 998.7 hPa42°F
MTKN6 - 8510560 - Montauk, NY 24 mi51 min 48°F 47°F1001 hPa
QPTR1 - 8454049 - Quonset Point, RI 27 mi51 min N 7 G 11 47°F 47°F1001.2 hPa
NWPR1 - 8452660 - Newport, RI 28 mi51 min N 8.9 G 14 47°F 41°F1000.8 hPa
NAXR1 - Narragansett Bay Reserve, RI 32 mi96 min NE 8.9 49°F 1001 hPa44°F
PRUR1 32 mi51 min 48°F 43°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 32 mi51 min NE 6 G 8.9 48°F 1001.5 hPa
CPTR1 - 8452944 - Conimicut Light, RI 35 mi51 min 48°F 49°F1001 hPa
FOXR1 - 8454000 - Providence, RI 37 mi51 min E 5.1 G 8
PVDR1 37 mi51 min NNE 5.1 G 7 50°F 1001.2 hPa42°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 41 mi51 min NNE 8 G 8.9 49°F 1000.9 hPa
FRXM3 41 mi51 min 49°F 42°F
BUZM3 - Buzzards Bay, MA 42 mi81 min NNE 14 G 15 1001.2 hPa (+1.0)
FRVM3 - 8447386 - Fall River, MA 42 mi51 min 49°F 48°F1001.1 hPa
44097 - Block Island, RI (154) 47 mi51 min 44°F2 ft

Wind History for New London, CT
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Westerly, Westerly State Airport, RI3 mi28 minN 810.00 miOvercast52°F41°F66%1001.2 hPa
Groton / New London, Groton / New London Airport, CT12 mi25 minN 1010.00 miOvercast51°F44°F77%1000.7 hPa
Block Island State Airport, RI19 mi25 minNNE 910.00 miOvercast48°F41°F77%1001.2 hPa
Montauk, Montauk Airport, NY21 mi27 minNNE 6 mi50°F42°F74%1001.3 hPa

Link to 5 minute data for KWST

Wind History from WST (wind in knots)
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SW9SW5SW6CalmSW3CalmCalmCalmCalmS4CalmCalmNE4CalmN3N6NE7N5N7N8N8
1 day agoS7SE13S11S8SW9SW4SW4W8W6W3W3CalmNW3W3NW3354W8
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2 days agoS9S7S10S10S9S7SW4SW4SW3S3CalmCalmCalmCalm3N3N4NW4N6N7NW8N106SW11

Tide / Current Tables for Westerly, Pawcatuck River, Rhode Island
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Westerly
Click for Map
Wed -- 04:27 AM EDT     -0.55 feet Low Tide
Wed -- 06:18 AM EDT     Sunrise
Wed -- 06:55 AM EDT     Moonset
Wed -- 09:58 AM EDT     3.21 feet High Tide
Wed -- 04:41 PM EDT     -0.34 feet Low Tide
Wed -- 07:20 PM EDT     Sunset
Wed -- 08:14 PM EDT     Moonrise
Wed -- 10:17 PM EDT     3.71 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.31.50.7-0-0.5-0.40.31.32.333.232.41.70.90.3-0.2-0.30.31.32.43.33.73.6

Tide / Current Tables for The Race, Long Island Sound, New York Current
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The Race
Click for Map
Wed -- 12:02 AM EDT     -0.00 knots Slack
Wed -- 03:08 AM EDT     -4.35 knots Max Ebb
Wed -- 06:19 AM EDT     Sunrise
Wed -- 06:22 AM EDT     0.00 knots Slack
Wed -- 06:56 AM EDT     Moonset
Wed -- 09:15 AM EDT     3.86 knots Max Flood
Wed -- 12:30 PM EDT     -0.00 knots Slack
Wed -- 03:30 PM EDT     -4.09 knots Max Ebb
Wed -- 06:37 PM EDT     0.00 knots Slack
Wed -- 07:21 PM EDT     Sunset
Wed -- 08:15 PM EDT     Moonrise
Wed -- 09:34 PM EDT     3.99 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-2-3.6-4.3-3.9-2.6-0.81.333.83.62.61-1-2.8-3.9-3.9-2.9-1.20.72.63.83.93.1

Weather Map
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wmap_A
GEOS 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (14,3,4,5)
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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 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.