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Marine Weather and Tides
Version 3.4 |
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome. 10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name. |
| Sunrise 6:28AM | Sunset 5:21PM | Wednesday February 20, 2019 5:03 PM EST (22:03 UTC) | Moonrise 7:46PM | Moonset 8:22AM | Illumination 98% |  |
ANZ231 Cape Cod Bay- 330 Pm Est Wed Feb 20 2019
.small craft advisory in effect from 2 am est Thursday through Thursday morning...
Tonight..S winds 5 to 10 kt with gusts up to 20 kt, becoming se 10 to 15 kt with gusts up to 30 kt after midnight. Seas 1 foot or less, then around 3 ft after midnight. Snow likely. Rain, sleet and freezing rain after midnight. Patchy fog after midnight. Vsby 1 to 3 nm, decreasing to 1 nm or less after midnight.
Thu..SW winds 10 to 15 kt, becoming W in the afternoon. Gusts up to 20 kt. Seas around 2 ft. Patchy fog in the morning. A chance of rain with patchy drizzle in the morning with vsby 1 to 3 nm.
Thu night..W winds 10 to 15 kt with gusts up to 30 kt. Seas around 3 ft.
Fri..NW winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Gusts up to 25 kt. Seas around 3 ft.
Fri night..N winds 5 to 10 kt. Seas around 2 ft.
Sat..NE winds around 5 kt, becoming S around 5 kt in the afternoon. Seas 1 foot or less.
Sat night..S winds 10 to 15 kt, becoming se 15 to 20 kt with gusts up to 25 kt after midnight. Seas around 2 ft. A chance of rain in the evening, then rain after midnight. Vsby 1 to 3 nm in the evening.
Sun..SE winds 15 to 20 kt, becoming S 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 3 to 4 ft. Rain.
Sun night..W winds 15 to 20 kt with gusts up to 25 kt, increasing to 20 to 25 kt with gusts up to 35 kt after midnight. Seas around 4 ft, building to 6 ft after midnight. A chance of rain in the evening.
Mon..W winds 25 to 30 kt with gusts up to 45 kt. Seas around 6 ft.
Mon night..NW winds 25 to 30 kt with gusts up to 45 kt. Seas around 6 ft. A chance of light freezing spray after midnight. 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.
.small craft advisory in effect from 2 am est Thursday through Thursday morning...
Tonight..S winds 5 to 10 kt with gusts up to 20 kt, becoming se 10 to 15 kt with gusts up to 30 kt after midnight. Seas 1 foot or less, then around 3 ft after midnight. Snow likely. Rain, sleet and freezing rain after midnight. Patchy fog after midnight. Vsby 1 to 3 nm, decreasing to 1 nm or less after midnight.
Thu..SW winds 10 to 15 kt, becoming W in the afternoon. Gusts up to 20 kt. Seas around 2 ft. Patchy fog in the morning. A chance of rain with patchy drizzle in the morning with vsby 1 to 3 nm.
Thu night..W winds 10 to 15 kt with gusts up to 30 kt. Seas around 3 ft.
Fri..NW winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Gusts up to 25 kt. Seas around 3 ft.
Fri night..N winds 5 to 10 kt. Seas around 2 ft.
Sat..NE winds around 5 kt, becoming S around 5 kt in the afternoon. Seas 1 foot or less.
Sat night..S winds 10 to 15 kt, becoming se 15 to 20 kt with gusts up to 25 kt after midnight. Seas around 2 ft. A chance of rain in the evening, then rain after midnight. Vsby 1 to 3 nm in the evening.
Sun..SE winds 15 to 20 kt, becoming S 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 3 to 4 ft. Rain.
Sun night..W winds 15 to 20 kt with gusts up to 25 kt, increasing to 20 to 25 kt with gusts up to 35 kt after midnight. Seas around 4 ft, building to 6 ft after midnight. A chance of rain in the evening.
Mon..W winds 25 to 30 kt with gusts up to 45 kt. Seas around 6 ft.
Mon night..NW winds 25 to 30 kt with gusts up to 45 kt. Seas around 6 ft. A chance of light freezing spray after midnight. 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 330 Pm Est Wed Feb 20 2019
Synopsis for massachusetts and rhode island coastal waters.. High pres moves over the waters this evening. Low pres approaches the waters from the sw tonight, then passes over the waters Thu bringing strong se winds to the waters. High pres follows for Fri and Sat. A warm front should approach the waters Sun. 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.
Synopsis for massachusetts and rhode island coastal waters.. High pres moves over the waters this evening. Low pres approaches the waters from the sw tonight, then passes over the waters Thu bringing strong se winds to the waters. High pres follows for Fri and Sat. A warm front should approach the waters Sun. 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 Yarmouth Port, MA
Hourly EDIT Helplocation: 41.71, -70.29 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 202124 afdbox area forecast discussion national weather service boston norton ma 424 pm est Wed feb 20 2019 Synopsis Strong high pressure moves off to the east tonight. Low pressure from the western gulf of mexico will redevelop along the east coast tonight and move across new england early Thursday. This will bring a period of snow and ice, changing to rain along the coast. High pressure follows with drier air Thursday afternoon through Saturday. Another round of a wintry mix of precipitation is possible Saturday night into Sunday, followed by dry and seasonable conditions next Monday and Tuesday. Near term until 6 am Thursday morning Broad upper ridge and surface high pressure are moving east of new england. Shortwave moving out of the plains will cross the great lakes tonight and northern new england Thursday. Our prime concern for tonight is a coastal secondary low developing off north carolina. This will move up the coast tonight and pass off the southern new england coastline roughly 09z to 12z. The leading edge of precipitation associated with this low was moving up through ct at 3 pm, mainly as light snow but with more substantial snowfall over the southwest corner of the state. This snow will spread across southern new england early tonight. Warmer air aloft is also moving up the coast. Above freezing air at 850 mb is expected to reach the mass pike around 1 am and the nh border around 4 am. Southeast winds should bring surface temps above freezing along the coast and the southeast interior during the overnight. Weak cold air damming over western and central sections may hold in surface cold air through the night. Because of this, we expect a variety of weather during the night. Snow all areas will mix change to sleet and freezing rain during the middle of the night, then coastal and some southern areas will change to rain between midnight and sunrise. Saturation in the prime growth zone aloft will be limited to a couple of hours, so accumulations will be limited. Best potential for snow is one to two inches. Freezing precipitation overnight will also bring a layer of ice, but this will be roughly one-tenth inch or less. The ice that follows the snow will be the more important threat in creating slippery spots on untreated surfaces. The winter weather advisory continues through the night. Short term 6 am Thursday morning through Thursday night Thursday... coastal low pressure moves off to the east in the morning. Lingering light rain drizzle is possible at the start, especially along eastern mass and ri. Drier air moves in later in the morning and afternoon. And should eventually eat away the low moisture and clouds. Clearing skies will allow daytime heating, with temperatures in the mixed layer favoring MAX sfc temps in the mid 40s to low 50s. Winds in the mixed layer will be near 30 mph, so expect gusts in that vicinity during the afternoon. Thursday night... high pressure builds over the great lakes, setting up a northwest flow over new england. This should maintain dry weather as well as a return of the colder air, with overnight min temps in the 20s and lower 30s. Long term Friday through Wednesday Highlights... * dry and seasonable Fri sat * another round of wintry mixed precip changing to rain Sat night sun * dry and near seasonable weather returns Mon tue overview... the big picture weather pattern in the extended features more of the same... A reloading west coast trough and persistent subtropical ridge. Several days of high pressure dry weather interrupted by periodic storm systems ejected from the mid level trough and directed over the ridge toward southern new england, first late weekend then again around mid week. Given the consistent pattern going into this weekend we continue to expect a messy winter system with a parent low to the northwest and too much warm air aloft and in the low levels to be a good snow maker. As mentioned by the previous forecaster, one synoptic model continues to show quite the interesting track evolution of the mid week system, but it is much too far out in time to give much consideration to at this time. Friday through Saturday... temps drop into the 20s... Low 30s along the coast. Friday and Saturday feature plenty of sunshine and seasonable temperatures under a 1030 mb high pressure and plenty of dry air. 850 temps 0 to -5c and good mixing will lead to high temperatures each day in the low 40s... Right around normal for late february. Mid-high clouds will be on the increase from west to east late Saturday as flow becomes southwest ahead of the next storm system. Saturday night through Sunday... Saturday night a shortwave approaches as the surface low moves into the great lakes region, strengthening as it enters canada. A weak secondary wave forms along the frontal boundary over the delmarva and passes over southern new england late Sunday. Ahead of this we have all the ingredients for a wet weather event. Plenty of moisture available as a deep fetch of subtropical moisture stretches up from the gulf brining pwats approaching 1.25". The warm front moves north across the region sometime late Saturday Sunday with a good signal for isentropic lift over the colder air at the surface and strong speed convergence at low levels given an approaching 45-55 kt 925 jet. Currently expecting a mostly rain event, moreso than the previous Wed thu event given warmer surface temperatures ahead of the system. Likely to start out briefly as a wintry mix of snow, sleet, and freezing rain before becoming all rain. Ahead of the cold front temperatures look quite warm, in the upper 40s Sunday afternoon. Monday and Tuesday... behind the cold front dry and colder weather prevails under high pressure for the first half of the work week. Gusty winds on Monday diminish into Tuesday. Aviation 20z Wednesday through Monday Forecaster confidence levels... |
low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Thursday night ... High confidence. Tonight... conditions will lower to MVFR ifr during the night as snow moves in from the southwest. Expect MVFR CIGS and ifr vsbys after 7 pm in the west after 10 pm in the east. Warmer air aloft will change the snow to sleet and freezing rain between 9 pm and midnight. Warmer air moving in at the surface on southeast winds will change the precip to rain roughly 3 to 6 am. Thursday... coastal storm moves off to the east. Lingering low clouds and drizzle during the morning, but this should diminish as drier air moves in on increasing west winds. BecomingVFR by afternoon. Thursday night... vfr. Breezy west to northwest winds. Kbos terminal... High confidence in TAF trends. Moderate confidence in timing precipitation type changes after midnight. Kbdl terminal... High confidence in TAF trends. Moderate confidence in timing precipitation type changes after 9 pm. Outlook Friday through Monday ... Friday:VFR. Breezy. Friday night:VFR. Saturday:VFR. Chance ra. Saturday night: mainlyVFR, with local ifr possible. Breezy. Ra, sn likely, fzra. Sunday: mainlyVFR, with areas ifr possible. Breezy. Ra likely, fzra. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Thursday night ... High confidence. Tonight... light southwest winds turn from the southeast. Wind gusts increasing to 30 knots after midnight. Seas building to 5-8 feet on the southern and southeast waters after midnight. Snow changes to sleet and then rain after midnight. Small craft advisory on most waters. Thursday... rain tapers off in the morning. Winds shift out of the west. Gusts increase to 30 knots by afternoon. Seas linger at 5-8 feet on all exposed waters. Thursday night... west-northwest winds gusting to 30 knots. Seas 5-7 feet on the exposed waters. Outlook Friday through Monday ... Friday: winds less than 25 kt. Local rough seas. Friday night: winds less than 25 kt. Seas locally approaching 5 ft. Saturday: winds less than 25 kt. Chance of rain. Saturday night: winds less than 25 kt. Seas locally approaching 5 ft. Rain. Sunday: low risk for small craft advisory winds with gusts up to 25 kt. Seas up to 5 ft. Rain likely. Tides coastal flooding High astronomical tides are forecast for Thursday, with heights near 12.5 ft at bos and close to 6 ft at pvd. Main concern for Thursday is the mid morning high tide in narragansett bay and buzzards bay, and the late morning high tide along the east coast. Guidance is suggesting a surge up to 1 ft is possible near high tide which may bring storm tides to near flood stage at pvd and bos. Expect pockets of minor coastal flooding, mainly in the usual spots. A coastal flood statement has been issued. Box watches warnings advisories Ct... Winter weather advisory from 7 pm this evening to 7 am est Thursday for ctz002>004. Ma... Winter weather advisory from 7 pm this evening to 7 am est Thursday for maz002>021-026. Ri... Winter weather advisory from 7 pm this evening to 7 am est Thursday for riz001>007. Marine... Small craft advisory from 2 am Thursday to 7 am est Friday for anz232>234. Small craft advisory from 2 am to 7 am est Thursday for anz231- 251. Small craft advisory from midnight tonight to 7 am est Friday for anz235-237-250-254>256. Synopsis... Wtb bw near term... Wtb bw short term... Wtb long term... Bw aviation... Wtb bw marine... Wtb bw tides coastal flooding... |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| 44090 | 9 mi | 33 min | 36°F | 1 ft | ||||
| 44020 - NANTUCKET SOUND | 15 mi | 23 min | SW 7.8 G 9.7 | 27°F | 35°F | 1032.5 hPa | 13°F | |
| WAXM3 - Waquoit Bay Reserve, MA | 15 mi | 78 min | SSE 1.9 | 29°F | 1033 hPa | 10°F | ||
| BZBM3 - 8447930 - Woods Hole, MA | 24 mi | 33 min | 28°F | 35°F | 1032.2 hPa | |||
| NTKM3 - 8449130 - Nantucket Island, MA | 31 mi | 33 min | SW 4.1 G 8 | 28°F | 34°F | 1032.7 hPa | ||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 35 mi | 73 min | SW 5.8 G 9.7 | 26°F | 1 ft | 1032.2 hPa (-1.3) | 10°F | |
| BUZM3 - Buzzards Bay, MA | 45 mi | 63 min | SW 7 G 8.9 | 28°F | 1033.5 hPa (-0.6) | |||
| FRVM3 - 8447386 - Fall River, MA | 46 mi | 33 min | 28°F | 41°F | ||||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 47 mi | 33 min | SSW 9.9 G 13 | 29°F | 1032.3 hPa | |||
| FRXM3 | 47 mi | 33 min | 29°F | 8°F | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 48 mi | 73 min | SW 7.8 G 9.7 | 28°F | 39°F | 1 ft | 1031.9 hPa (-1.2) | 9°F |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | |
| Last 24hr | W G11 | W G11 | W | NW G10 | NW G13 | NW G14 | NW G16 | NW G18 | NW G15 | N G14 | NW | NW G17 | NW G15 | NW G12 | NW G9 | NW G12 | N G9 | N | N | N G9 | NW G7 | N | NE | NW |
| 1 day ago | NW G11 | NW G15 | NW G21 | NW G23 | NW G23 | NW G19 | NW G19 | NW G22 | NW G22 | NW G20 | NW G23 | NW G24 | NW G24 | NW G21 | NW G24 | NW G19 | NW G17 | NW G18 | N G16 | NW G14 | NW G15 | NW G13 | NW G10 | W G12 |
| 2 days ago | SW | S | S | S | -- | SE | SE | S G6 | SE | E | E | NE G8 | NE G7 | NE | NE G11 | E G12 | E G12 | E G14 | E | NE G7 | N G7 | N | NW G10 | NW G10 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Hyannis, Barnstable Municipal-Boardman Airport, MA | 2 mi | 67 min | S 4 | 10.00 mi | Overcast | 28°F | 10°F | 49% | 1032 hPa |
| Otis Air National Guard Base, MA | 13 mi | 68 min | WSW 5 | 10.00 mi | Fair | 27°F | 8°F | 46% | 1032.2 hPa |
| Chatham, Chatham Municipal Airport, MA | 16 mi | 71 min | SSW 3 | 10.00 mi | Mostly Cloudy | 28°F | 14°F | 56% | 1032.7 hPa |
| Provincetown Municipal Airport, MA | 21 mi | 67 min | SSW 7 | 10.00 mi | Fair | 27°F | 14°F | 58% | 1032.5 hPa |
Wind History from HYA (wind in knots)
| 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | |
| Last 24hr | Calm | Calm | W | NW | NW | W | W | NW | W | NW | NW | W | NW | W | NW | NW | NW | NW | Calm | Calm | SW | SE | S | S |
| 1 day ago | NW G21 | NW G23 | NW G20 | NW G20 | NW G22 | NW G20 | NW G24 | NW G25 | NW G34 | NW G27 | NW G19 | NW G18 | NW G18 | NW G22 | NW G16 | N G19 | NW G20 | N G24 | NW G22 | N G17 | NW | NW | Calm | NW |
| 2 days ago | Calm | S | Calm | Calm | Calm | Calm | Calm | Calm | N | NE | E | E | NE | E | NE | NE | NE | N | N | N | NW | NW | NW G20 | NW G22 |
Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of DataBarnstable Harbor
Click for Map
Wed -- 05:45 AM EST -1.28 feet Low Tide
Wed -- 06:29 AM EST Sunrise
Wed -- 07:21 AM EST Moonset
Wed -- 11:40 AM EST 12.12 feet High Tide
Wed -- 05:20 PM EST Sunset
Wed -- 06:19 PM EST -2.11 feet Low Tide
Wed -- 06:45 PM EST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 05:45 AM EST -1.28 feet Low Tide
Wed -- 06:29 AM EST Sunrise
Wed -- 07:21 AM EST Moonset
Wed -- 11:40 AM EST 12.12 feet High Tide
Wed -- 05:20 PM EST Sunset
Wed -- 06:19 PM EST -2.11 feet Low Tide
Wed -- 06:45 PM EST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 10.6 | 9.2 | 6.9 | 4.1 | 1.3 | -0.7 | -1.2 | 0.3 | 3.1 | 6.4 | 9.6 | 11.7 | 12 | 10.8 | 8.5 | 5.6 | 2.4 | -0.5 | -2 | -1.6 | 0.6 | 3.6 | 7 | 9.8 |
Tide / Current Tables for Cape Cod Canal, Massachusetts Current
EDIT (on/off) Help One Week of DataCape Cod Canal
Click for Map
Wed -- 12:28 AM EST -4.87 knots Max Ebb
Wed -- 03:31 AM EST 0.04 knots Slack
Wed -- 06:31 AM EST Sunrise
Wed -- 06:32 AM EST 4.71 knots Max Flood
Wed -- 07:22 AM EST Moonset
Wed -- 09:44 AM EST -0.08 knots Slack
Wed -- 12:47 PM EST -5.24 knots Max Ebb
Wed -- 03:57 PM EST 0.23 knots Slack
Wed -- 05:21 PM EST Sunset
Wed -- 06:47 PM EST Moonrise
Wed -- 07:04 PM EST 5.03 knots Max Flood
Wed -- 10:28 PM EST -0.23 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 12:28 AM EST -4.87 knots Max Ebb
Wed -- 03:31 AM EST 0.04 knots Slack
Wed -- 06:31 AM EST Sunrise
Wed -- 06:32 AM EST 4.71 knots Max Flood
Wed -- 07:22 AM EST Moonset
Wed -- 09:44 AM EST -0.08 knots Slack
Wed -- 12:47 PM EST -5.24 knots Max Ebb
Wed -- 03:57 PM EST 0.23 knots Slack
Wed -- 05:21 PM EST Sunset
Wed -- 06:47 PM EST Moonrise
Wed -- 07:04 PM EST 5.03 knots Max Flood
Wed -- 10:28 PM EST -0.23 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| -4.8 | -4.8 | -4 | -2.5 | 2.3 | 3.9 | 4.6 | 4.7 | 4.1 | 2.9 | -1.8 | -4 | -5 | -5.2 | -4.7 | -3.5 | 0.7 | 3.6 | 4.7 | 5 | 4.8 | 4 | 2.4 | -2.7 |
Weather Map and Satellite Images
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GOES 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
Wind Forecast for Boston, MA (17,4,5,8)
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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 numerious 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. |