Friday, April3, 2020
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Marine Weather and Tides
Dover, MA

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 6:21AMSunset 7:14PM Friday April 3, 2020 12:36 AM EDT (04:36 UTC) Moonrise 1:47PMMoonset 4:02AM Illumination 76% 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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ANZ230 Boston Harbor- 1016 Pm Edt Thu Apr 2 2020
.gale warning in effect from 5 am edt Friday through Friday evening...
Overnight..N winds 20 to 25 kt with gusts up to 35 kt. Waves 4 to 7 ft, except 8 to 11 ft at the outer harbor entrance. Patchy fog. Rain. Vsby 1 to 3 nm.
Fri..NE winds 20 to 25 kt with gusts up to 40 kt. Waves 5 to 8 ft, except 11 to 16 ft at the outer harbor entrance. Patchy fog. Rain. Vsby 1 to 3 nm.
Fri night..NE winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 35 kt. Waves 4 to 7 ft, except 9 to 12 ft at the outer harbor entrance. Patchy fog. Rain likely. Vsby 1 to 3 nm.
Sat..NE winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Waves 2 to 4 ft, except 5 to 8 ft at the outer harbor entrance. A chance of rain.
Sat night and Sun..S winds 5 to 10 kt. Waves 1 foot or less, except 4 to 7 ft at the outer harbor entrance.
Sun night..SW winds 5 to 10 kt. Waves 1 foot or less, except 3 to 5 ft at the outer harbor entrance.
Mon through Tue..S winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance.
Tue night..S winds 5 to 10 kt. Waves around 2 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 1016 Pm Edt Thu Apr 2 2020
Synopsis for massachusetts and rhode island coastal waters.. A large and intense ocean storm well east of the waters will gradually pinwheel back toward the coast through Friday morning. This storm will bring gale to storm force winds to the waters along with rough seas. The system will move south and away from the waters off the shore of southern new england Friday night. Weak high pressure will then build back over the waters this weekend. 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 Dover, MA
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location: 42.27, -71.27     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 030203 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1003 PM EDT Thu Apr 2 2020

SYNOPSIS. A large and intense ocean storm moves west toward Southern New England tonight, then pinwheels toward the south on Friday. This storm will bring strong to possibly damaging winds and coastal flooding to east coastal Massachusetts, especially Cape Cod and the Islands. In addition, periods of rain will fall heavily at times across the area through Friday night. A slow moving, weak front will bring scattered showers Sunday through Sunday night. Unsettled conditions will linger at times into mid week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. 10 PM update .

Bands of rain have overspread all of SNE tonight with heavier rain elements rotating across SE MA and Cape/Islands. RAP thermal profile indicates the column may be marginally cold enough for some snow or rain/snow mix over higher elevations in northern MA, but it warms the low levels 03-06z so any snow/mix here will become all rain. Given temps are above freezing and the precip is light do not expect any accum other than a light coating on the grass.

Vertically stacked ocean storm has begun its westward track toward New Eng so expect a continuation of bands of rain overnight which may be locally heavy at times across eastern New Eng. Winds will begin to ramp up along east coastal MA and Cape Cod toward daybreak as the nose of the 50-60 kt low level jet approaches. Gusts to 40-50 mph expected.

Previous Discussion .

Closed low well south of Yarmouth Nova Scotia is vertically stacked through the upper atmosphere. That means it isn't going anywhere soon. Instead it will drift west with the upper low during the night. Strong low level jet and a favorable left exit region of the upper jet will combine with the marine flow to generate bands of rain than move across the Gulf of Maine and onshore into Eastern MA.

The airmass over Southern New England was still relatively dry during the mid afternoon, with dew point depressions of 9F at Boston, 17F at PVD, and 22F at BDL. This dry air evaporates the incoming precipitation leaving a very light rain at most. Expect the rain to eat away at the dry air and eventually win out. That will bring an increasing chance of measurable rain during the night . soonest in Eastern MA and latest in the CT Valley and Berkshire East Slopes.

Winds to be discussed in the short term section will increase during the night with sustained winds 15-25 kt. Gusts will be 25-35 kt inland while the Cape/Islands/North Shore/South Shore will increase to 40-45 kt.

SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/. Large ocean storm retrogrades back to the west making its closest approach to Southern New England Friday morning. The storm passes just SE of the 40N/70W benchmark before continuing to move southward during Friday.

Temperatures at 950 mb suggest daytime temps in the 40s most places, possibly around 50 or low 50s in the CT Valley.

Winds: A stiff pressure gradient north of the low will turn winds over Southern New England from the northeast with increasing speeds overnight, especially across Eastern MA. Low level northeast winds reach 50-60 kt as they approach the Eastern MA coast. Model soundings for BOS and Plymouth show mixing to just below the 50 kt layer while mixing at HYA reaches into this layer Friday. Because of this expect High Wind criteria for gusts to 60 mph on Cape Cod and Islands later tonight into Friday night. Wind Advisory criteria for gusts to 50 mph expected along the MA East Coast.

The pressure gradient weakens late Friday and Friday night, and the low level jet weakens and moves off to the south. As that happens, expect the winds over Srn New England should diminish.

Rain: Bands of rain will continue to move from east to west from the Gulf of Maine to over land. Precipitable water values will be between 0.75 and 1.0 inches. This isn't exceptional, but it is above average for early April. The upper jet around the stalled upper low will also be flowing toward the west, placing the left exit region over Southern New England. Convergence ahead of the low level jet and lift generated by the left exit region upstairs should generate appreciable lift. The lift and available moisture suggest rainfall of 1 to 1.5 inches near the coast and less than 0.5 inches in the CT Valley.

Rain and wind diminish later Friday night as the support moves off.

See coastal flooding section below for a discussion of coastal flood potential.

LONG TERM /SATURDAY THROUGH THURSDAY/. * Becoming drier through the day on Saturday but shower chances linger, especially over eastern MA

* A weak disturbance and approaching cold front may bring scattered showers Sunday into Sunday night

* Dry, warmer than average conditions briefly return Monday, cooling through mid week

* Generally dry through mid week but a few weak systems may bring scattered showers at times

Details .

Saturday and Sunday .

Things will be ramping down Saturday morning as the coastal storm slowly makes its way southeast and away from southern New England. The pressure gradient continues to slacken through the day, so peak wind gusts will occur early in the morning, mainly along the south coast, Cape Cod, and islands. Here we'll continue to see gusts 30 to 35 mph into early afternoon, diminishing through the evening. As for rain chances, most should stay dry, if cloudy, most of the day. However, can't rule out a few scattered showers during the morning into early afternoon, especially over eastern MA/RI where moist NE flow in the BL and lingering jet at 925 mb may help to prolong areas of scattered showers/drizzle. While drier air moves in aloft low level moisture sticks around, keeping mostly cloudy skies even as weak high pressure builds in. Highs top out in the low to mid 50s in the CT valley, while cool NE flow keeps areas further east in the 40s.

By Sunday sfc high pressure moves overhead with a mid level ridge. However, its tempered by a weak disturbance in the flow which may introduce some hit and miss showers early, but overall we stay dry. Low level moisture sticks around for at least partly cloudy skies. Even so, modest warm advection brings 925 mb temps up to around 6C translating to sfc highs that are warmer than Saturday, in the upper 50s in western MA/CT and low to mid 50s further east. Temperatures have been increased a bit, especially for western MA/CT which stands the best chance of getting into the warm sector ahead of the approaching cold front. Chance of rain returns first in western MA by afternoon, spreading east through the evening/overnight hours. This is due to a sfc low which passes to our north dragging a cold front through the region Sunday evening into Monday morning. The best forcing remains to our north and rain chances will diminish as it moves east. Overall a very light QPF event.

Monday .

Monday will be the warmest day of the week as 925 mb temps surge to 7-8C leading to high temperatures in the low 60s. For perspective, average highs for early April are in the low 50s, so we'll be about 10 degrees above normal. Weak high pressure keeps things dry and the cold front finally scours out the low level moisture, so we should get plenty of sun. This may allow high temps to overachieve even what we're currently thinking.

Tuesday through Thursday .

Beyond the post frontal drier airmass on Monday, confidence diminishes as a trough dips down to our north over southeast Canada ahead of an approaching ridge and eventual next organized storm system. Timing of our next storm system is uncertain with large swings in the guidance but generally toward Wednesday/Thursday another chance of widespread rain returns.

AVIATION /02Z FRIDAY THROUGH TUESDAY/. Forecaster Confidence Levels .

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

00Z update .

Tonight . Moderate confidence.

IFR cigs have started to move onto the Cape and Islands with MVFR cigs further west, and the trend overnight will be increasing IFR moving west. Expect these lowering conditions to trend west across Southern New England during the night as the low level dry air moistens. Western areas will to lower to MVFR, while areas in and east of the Central Hills will lower to IFR in rain and fog.

Northwest winds gusting 25 to 30 kt will turn from the northeast along the coast with gusts increasing to 40-45 kt by morning.

Friday . Moderate confidence.

MVFR/IFR conditions in periods of rain. NE gusts 40-50 kt Cape/Islands and 35-45 kt east coastal MA into SE MA and coastal RI. Periods of 1-3 mile vsbys in rain and fog.

Friday night . Moderate confidence.

MVFR west and IFR east. Rain and wind diminish overnight. Northeast winds along the coast will initially gust 35-45 kt, diminishing to 20-30 kt by morning.

KBOS Terminal . Moderate confidence. MVFR early, lowering to IFR overnight. Rain and northeast winds gusting to 35 kt.

KBDL Terminal . High confidence in trends, but lower confidence on exact timing. VFR trending to MVFR CIGS overnight.

Outlook /Saturday through Tuesday/ .

Saturday: Mainly VFR, with local IFR possible. Windy with local gusts up to 30 kt. Slight chance SHRA.

Saturday Night: Mainly VFR, with local IFR possible. Breezy.

Sunday: Mainly VFR, with local IFR possible. Slight chance SHRA.

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

Monday: VFR.

Monday Night: VFR. Slight chance SHRA.

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

MARINE. Large ocean storm south of Nova Scotia backs up to the west. This brings strong winds and rough seas, especially to the eastern MA waters. Storm force gusts to 50 kt are expected over eastern waters with gusts to 40 kt over the remaining waters. Peak of the wind will be Friday morning as the storm makes its closest approach to the waters, then turns toward the south. Storm warnings and gale warnings are in place. Seas will build to 20-25 ft east of Cape Cod and Nantucket. Vsbys reduced in period of rain and fog.

Northeast winds gust to gale force Friday night, but show a diminishing trend through the night. Rough seas continue, but these will as show a subsiding trend through the night.

Outlook /Saturday through Tuesday/ .

Saturday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 16 ft. Slight chance of rain showers.

Saturday Night: Winds less than 25 kt. Rough seas up to 12 ft.

Sunday: Winds less than 25 kt. Rough seas up to 9 ft.

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

Monday: Winds less than 25 kt. Local rough seas.

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

Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.

TIDES/COASTAL FLOODING. Current tidal departure at Nantucket is 2 feet. Expect a surge of around 2.5 feet during the high tide tonight. This will bring the storm tide just over 5 feet and there will be areas that see minor coastal flooding for Nantucket tonight.

Friday .

The main concern is the Friday morning high tide for all of east coastal MA as the core of strong winds and seas will occur around this time. Confidence still high in a storm surge of 3 feet as advertised per Stevens Institute surge ensembles. Expect seas east of Nantucket and Cape Cod to build up to 25 feet or greater. Around the Boston Buoys seas of 15-20 ft can be expected. These dangerous seas will be long period/high energy waves. This will result in widespread minor flooding along the entire east coast of MA with pockets of moderate flooding. The risk of moderate flooding continues at Nantucket, and also anticipate flooding at Marthas Vineyard. Expect flooding to mostly be minor at Marthas Vineyard, but there may be a few locations that see moderate.

Tides still are about a little less than a foot lower for the Fri evening high tide and surge and seas will also be a bit lower. As a result not expecting much flooding for the Fri evening high tide, except pockets of minor flooding are possible for Nantucket.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Coastal Flood Warning from 6 AM to 10 AM EDT Friday for MAZ007- 015-016-019-022>024. Wind Advisory from 5 AM to 11 PM EDT Friday for MAZ007-019-021. High Wind Warning from 5 AM to 8 PM EDT Friday for MAZ022>024. Coastal Flood Advisory until 10 PM EDT this evening for MAZ024. RI . None. MARINE . Storm Warning from 5 AM to 8 PM EDT Friday for ANZ231-232-250- 254-255. Gale Warning from 2 AM Friday to 6 AM EDT Saturday for ANZ233>235-237. Gale Warning from 5 AM to 8 PM EDT Friday for ANZ230-236. Gale Warning until 6 AM EDT Saturday for ANZ251. Gale Warning until 9 AM EDT Saturday for ANZ256.

SYNOPSIS . WTB/BW NEAR TERM . WTB/KJC/BW SHORT TERM . WTB LONG TERM . BW AVIATION . WTB/BW MARINE . WTB/BW TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 13 mi54 min 41°F 43°F997.2 hPa
44013 - BOSTON 16 NM East of Boston, MA 33 mi46 min NNW 21 G 23 42°F 42°F7 ft996.3 hPa (-0.4)42°F
FOXR1 - 8454000 - Providence, RI 33 mi54 min N 15 G 18 42°F 42°F998.3 hPa
PVDR1 34 mi48 min NNW 11 G 16 42°F 998.3 hPa39°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 39 mi48 min NNW 16 G 24 42°F 997.5 hPa
FRVM3 - 8447386 - Fall River, MA 40 mi48 min 41°F 44°F997.8 hPa
FRXM3 40 mi48 min 42°F 39°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 41 mi92 min N 21 G 25 42°F 42°F8 ft995.1 hPa
NAXR1 - Narragansett Bay Reserve, RI 44 mi51 min N 13 41°F 998 hPa38°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 44 mi48 min N 13 G 19 42°F 998.3 hPa
PRUR1 46 mi48 min 42°F 38°F
QPTR1 - 8454049 - Quonset Point, RI 48 mi48 min NNW 12 G 19 42°F 45°F997.9 hPa

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Norwood, Norwood Memorial Airport, MA8 mi2.7 hrsNNW 12 G 208.00 miLight Rain41°F36°F82%998.8 hPa
East Milton, MA9 mi1.8 hrsNNW 14 G 26 mi37°F36°F96%998.5 hPa
Laurence G Hanscom Field Airport, MA14 mi45 minNNW 138.00 miLight Rain40°F37°F93%1000.2 hPa
Boston, Logan International Airport, MA15 mi1.7 hrsNW 16 G 245.00 miLight Rain Fog/Mist40°F36°F86%998.4 hPa

Link to 5 minute data for KOWD

Wind History from OWD (wind in knots)
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1 day agoCalmCalmCalmCalmCalmN5NW4NW3N9N9NE10
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2 days agoNE9NE6NE3NE5N8N6N7N6N6N8NE9NE8E105E94NE7NE8E7NE4CalmCalmCalmCalm

Tide / Current Tables for Neponset, Neponset River, Massachusetts
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Neponset
Click for Map
Fri -- 01:17 AM EDT     1.59 feet Low Tide
Fri -- 04:01 AM EDT     Moonset
Fri -- 06:22 AM EDT     Sunrise
Fri -- 07:24 AM EDT     9.69 feet High Tide
Fri -- 01:45 PM EDT     Moonrise
Fri -- 02:00 PM EDT     0.50 feet Low Tide
Fri -- 07:12 PM EDT     Sunset
Fri -- 08:10 PM EDT     8.87 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.51.61.93.45.278.69.69.58.46.74.72.81.20.51.22.74.56.48.18.98.57.35.7

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Fri -- 01:27 AM EDT     0.00 knots Slack
Fri -- 03:32 AM EDT     1.10 knots Max Flood
Fri -- 04:00 AM EDT     Moonset
Fri -- 06:22 AM EDT     Sunrise
Fri -- 07:07 AM EDT     -0.00 knots Slack
Fri -- 10:41 AM EDT     -1.06 knots Max Ebb
Fri -- 01:45 PM EDT     Moonrise
Fri -- 02:02 PM EDT     0.00 knots Slack
Fri -- 04:15 PM EDT     1.10 knots Max Flood
Fri -- 07:12 PM EDT     Sunset
Fri -- 07:48 PM EDT     -0.00 knots Slack
Fri -- 11:37 PM EDT     -0.98 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.30.511.110.70.1-0.5-0.9-1-1.1-1-0.8-00.81.11.110.5-0.1-0.6-0.8-1

Weather Map
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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.
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Wind Forecast for Boston, MA (0,6,7,8)
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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 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.