Thursday, July9, 2020
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Marine Weather and Tides
Tiverton, 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 5:18AMSunset 8:22PM Thursday July 9, 2020 3:36 AM EDT (07:36 UTC) Moonrise 11:28PMMoonset 9:41AM Illumination 85% Phase: Waning Gibbous; Moon at 19 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- 116 Am Edt Thu Jul 9 2020
Rest of tonight..SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog. Vsby 1 to 3 nm.
Thu..S winds 5 to 10 kt. Waves around 2 ft.
Thu night..S winds 5 to 10 kt, becoming se after midnight. Waves around 2 ft. Patchy fog. Vsby 1 nm or less.
Fri..SE winds 5 to 10 kt. Waves 2 to 4 ft. Patchy fog. Showers and tstms likely. Some tstms may produce heavy rainfall. Vsby 1 to 3 nm.
Fri night and Sat..S winds 10 to 15 kt with gusts up to 20 kt. Waves 3 to 5 ft. Showers and tstms. Some tstms may produce heavy rainfall. Vsby 1 to 3 nm.
Sat night..SW winds 5 to 10 kt. Waves 2 to 4 ft. A chance of showers and tstms.
Sun..SW winds 5 to 10 kt with gusts up to 20 kt. Waves 2 to 4 ft. A chance of showers and tstms.
Sun night and Mon..SW winds 5 to 10 kt. Gusts up to 20 kt. Waves 2 to 4 ft.
Mon night..SW winds 5 to 10 kt. Waves 2 to 4 ft. A chance of showers and tstms. Winds and waves 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 Am Edt Thu Jul 9 2020
Synopsis for massachusetts and rhode island coastal waters.. A cold front will slowly settle over the waters late this afternoon. Strengthening low pressure will move up along the carolina coast late Thursday and passing near cape cod on Saturday. A cold front will cross the waters early Sunday. 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 Tiverton, RI
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location: 41.63, -71.21     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 090235 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1035 PM EDT Wed Jul 8 2020

SYNOPSIS. Summer like warmth and humidity persists through the weekend. A few showers or thunderstorms will be possible each day with some heavy downpours, but much of this time will also feature dry weather especially on Thursday when heat and humidity peak. A coastal low with tropical moisture will likely impact the region late Friday into Saturday with heavy rain and potential flooding.

NEAR TERM /UNTIL 6 AM THURSDAY MORNING/.

1030 PM Update .

Forecast is largely on track. The MCS over NH/ME slid ESE over the waters, leaving us with a dry evening. Did notice that patchy fog has developed over parts of the South Coast and interior fog- prone areas in the river valleys such as Orange, MA. Coverage and intensity of fog will depend on whether winds decouple overnight. Areas north and along MA Route 2 that received rain earlier this afternoon have a better shot of developing locally dense fog. Otherwise, with dew points in the upper 60s and lows in the low 70s, it will be a somewhat uncomfortable and muggy night.

PREVIOUS DISCUSSION .

745 PM Update .

The line of thunderstorms responsible for severe weather across Southern VT/NH fizzled out as it crossed into MA, leaving us scattered showers north of the MA Pike. Further north, a MCS is barreling southeastwards through Central NH and Southern ME but is expected to miss our area. So expect a mostly dry and muggy night with overnight lows mostly in low 70s. Southwest winds advecting dew pts in the upper 60s and low 70s will result in patchy locally dense fog especially along the South Coast and the Cape and Islands. But just about most areas could stand a chance of seeing patchy fog, particularly the interior fog prone areas such as the river valleys and coastal plains.

SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/. *** Hot and Humid with heat indices 95-99 Thursday ***

Thursday .

Mid/upper level ridge builds over the area with 925 mb temps even warmer than today, with values Thu around +23C. This will support highs in the upper 80s to lower 90s away from the south coast. This combined with dew pts continuing in the low 70s will support heat indices of 95-99 across the CT and Merrimack river valleys. This includes Hartford to Springfield and the northern and northwest suburbs of Boston. Oppressive heat and humidity for sure especially less of a breeze tomorrow than today to take the edge of the heat.

Regarding precip chances, building mid level ridge will provide a cap Thu across the region. However with temps in the low 90s and dew pts in the low 70s, looking at another high CAPE and even lower shear environment tomorrow. Expecting subsidence/cap environment to win out, however can still pop scattered low top showers/thunderstorms Thu afternoon. Hi Res guidance suggest sea breeze boundaries could be a focus along with the hilly terrain of northern MA. Not a washout by any means but isolated shower/thunderstorm possible. Given even less shear tomorrow any storm will pulse up and down even quicker than today. Again most of the region remains dry tomorrow, just a low risk for an isolated shower/thunderstorm in the afternoon especially northern MA.

Thursday night .

Any isolated early evening shower/thunderstorm will diminish rapidly with sunset. Remaining very warm and humid with lows only 65-70 and dew pts in the same range. Given the high dew pt airmass patchy fog is likely.

LONG TERM /FRIDAY THROUGH WEDNESDAY/. Highlights .

* Tropical humidity persists into weekend * Potential for flash flooding from heavy rain Friday-Saturday * Some drying next week and turning warmer

Overall pattern should feature troughing over eastern states through early next week which will help maintain summer like pattern with more of a tropical feel as moisture streams up from south. Eventually by middle of next week, ensembles seem to be favoring return of upper ridge across most of the East which will bring somewhat drier but potentially hot weather.

Main concern is potential for tropical cyclone formation off NC/SC coast during next day or two. Latest NHC Tropical Weather Outlook indicates a 70% chance of this low becoming a tropical (or subtropical) cyclone as it tracks NNE and up along the East Coast, either hugging the coastline or tracking a little offshore Friday into Saturday. It should be noted that overall confidence with track and strength of this system remains very low at this time for SNE.

Regardless of the track, main impact from this system is not expected to be from wind (although gusty winds are possible near coast and on coastal waters) but from flash flooding due to heavy rainfall. Plume of tropical moisture will bring PWATs over 2" and many of the ensemble parameters associated with excessive rainfall are at last in 90th percentile when compared with climatology. Due to uncertainties in this system's formation and eventual track, there is high uncertainty as to where heaviest rain will fall. We do think most of SNE will receive 1-2" of rain on average but there is certainly the potential for locally higher amounts.

Other potential impact is increased risk of rip currents Friday through weekend, especially at south coastal beaches. Risk of coastal flooding is low due to relatively low astronomical tides.

Beyond Saturday, we should dry out a bit as we lose tropical humidity but typical summertime weather should prevail into early next week, before potentially another round of hot weather arrives by mid week.

AVIATION /03Z THURSDAY THROUGH MONDAY/. Forecaster Confidence Levels .

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

0230Z Update .

Tonight . high confidence.

Mostly VFR conditions then trending to MVFR with low risk of isolated IFR in areas where locally dense fog develop. Terminals in fog-prone areas like BDL and BAF as well as those along the South Coast and Cape and Islands could see IFR conditions, but the duration of IFR will hinge on whether winds decouple overnight. Light SW wind around 5 kt.

Thursday . moderate confidence given some uncertainty on areal coverage of showers and thunderstorms.

Any morning MVFR/IFR in low clouds and fog will improve to VFR by 15z. Then in the afternoon VFR with isolated MVFR in scattered showers/thunderstorms with a focus over northern MA. Light SSW with local seabreezes possible.

Thursday night . high confidence.

Any early evening showers/thunderstorms fall apart with sunset. VFR to start with low prob of MVFR/IFR toward morning in low clouds and fog.

KBOS Terminal . Moderate confidence in TAF. Greatest risk for a t-storm is between 21z and 01z. Strongest storms likely remain across NH/VT.

KBDL Terminal . Moderate confidence in TAF. Isolated thunderstorm possible this afternoon with the threat ending 00z-01z.

Outlook /Friday through Monday/ .

Friday: Mainly VFR, with local IFR possible. SHRA likely, chance TSRA.

Friday Night: MVFR/IFR conditions possible. Breezy. SHRA likely, slight chance TSRA.

Saturday: Mainly VFR, with local IFR possible. Breezy. SHRA likely, slight chance TSRA.

Saturday Night: VFR. Chance SHRA, isolated TSRA.

Sunday and Monday: VFR. Slight chance SHRA, isolated TSRA.

MARINE. Tonight . Chance of an early evening thunderstorm, otherwise light SW wind 10-15 kt with any gusts up to 25 kt near shore diminishing with sunset. Patchy fog likely, locally dense at times.

Thursday . light SW winds and morning low clouds and fog will burn off by midday. Isolated shower/thunderstorm possible northern MA waters near shore.

Thu night . light south winds becoming SE toward Fri morning. Low clouds and patchy for reforming.

Outlook /Friday through Monday/ .

Friday: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers, slight chance of thunderstorms.

Friday Night: Winds less than 25 kt. Areas of rough seas. Rain showers likely, slight chance of thunderstorms.

Saturday: Winds less than 25 kt. Areas of rough seas. Chance of rain showers, slight chance of thunderstorms.

Saturday Night: Winds less than 25 kt. Local rough seas. Slight chance of rain showers, isolated thunderstorms.

Sunday and Monday: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers, isolated thunderstorms.

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

SYNOPSIS . Nocera/JWD NEAR TERM . Nocera/Chai SHORT TERM . Nocera LONG TERM . JWD AVIATION . Nocera/JWD/Chai MARINE . Nocera/JWD


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FRXM3 5 mi49 min 74°F 72°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 5 mi49 min SSW 9.9 G 12 74°F 1015.4 hPa
PRUR1 5 mi49 min 74°F 73°F
FRVM3 - 8447386 - Fall River, MA 6 mi49 min 74°F 74°F1015.8 hPa
NAXR1 - Narragansett Bay Reserve, RI 7 mi112 min WSW 2.9 73°F 1015 hPa72°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 7 mi49 min WSW 4.1 G 7 74°F 1015.9 hPa
CPTR1 - 8452944 - Conimicut Light, RI 9 mi49 min 74°F 75°F1015.4 hPa
NWPR1 - 8452660 - Newport, RI 11 mi49 min SSW 6 G 7 71°F 65°F1015.4 hPa
QPTR1 - 8454049 - Quonset Point, RI 11 mi49 min WSW 7 G 9.9 74°F 70°F1015.5 hPa
PVDR1 14 mi49 min SSW 4.1 G 5.1 75°F 1015.5 hPa72°F
FOXR1 - 8454000 - Providence, RI 16 mi49 min SW 4.1 G 5.1 75°F 73°F1015.4 hPa
BUZM3 - Buzzards Bay, MA 19 mi37 min SW 8.9 G 9.9 1016.4 hPa (+0.4)
BZBM3 - 8447930 - Woods Hole, MA 29 mi49 min 69°F 71°F1015.8 hPa
WAXM3 - Waquoit Bay Reserve, MA 36 mi112 min S 1.9 72°F 1016 hPa71°F
44097 - Block Island, RI (154) 46 mi71 min 69°F2 ft
44090 49 mi40 min 67°F1 ft

Wind History for Borden Flats Light at Fall River, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Newport, Newport State Airport, RI7 mi44 minN 08.00 miOvercast74°F71°F91%1015.1 hPa
N. Kingston / Quonset, RI11 mi4.8 hrsSW 1510.00 miMostly Cloudy0°F0°F%1014.9 hPa
New Bedford, New Bedford Regional Airport, MA13 mi44 minSW 610.00 miOvercast71°F71°F100%1015.1 hPa
Providence, Theodore Francis Green State Airport, RI14 mi46 minSSW 410.00 miPartly Cloudy73°F71°F94%1015.2 hPa
Taunton, Taunton Municipal Airport, MA21 mi45 minSSW 310.00 miOvercast74°F71°F91%1014.8 hPa
Pawtucket, North Central State Airport, RI22 mi41 minSW 310.00 miOvercast71°F71°F100%1010.1 hPa

Link to 5 minute data for KUUU

Wind History from UUU (wind in knots)
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55S83S4S66Calm3Calm
1 day agoSE6SE4SE4SE4S6SE7SE6S86S9S9SE10SE8S9SE7SE96SE8SE8SE11SE10S6S5S7
2 days agoS4S3NW3N6N9N7N10N11N11NE11NE11NE11
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E6NE6E6SE53S5S3SE5SE4S6S5

Tide / Current Tables for Anthony Point, Sakonnet River, Rhode Island
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Westport River Entrance, Massachusetts Current
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Westport River Entrance
Click for Map
Thu -- 12:02 AM EDT     -0.01 knots Slack
Thu -- 02:30 AM EDT     -2.49 knots Max Ebb
Thu -- 05:19 AM EDT     Sunrise
Thu -- 06:33 AM EDT     0.00 knots Slack
Thu -- 09:41 AM EDT     Moonset
Thu -- 10:17 AM EDT     2.38 knots Max Flood
Thu -- 12:40 PM EDT     -0.01 knots Slack
Thu -- 03:02 PM EDT     -2.31 knots Max Ebb
Thu -- 07:20 PM EDT     0.00 knots Slack
Thu -- 08:19 PM EDT     Sunset
Thu -- 10:42 PM EDT     1.89 knots Max Flood
Thu -- 11:26 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-1.5-2.4-2.4-1.9-1.2-0.40.31.11.92.32.21.1-0.5-1.8-2.3-2-1.5-0.9-0.20.41.11.71.9

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (3,6,7,8)
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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.