|
Marine Weather and Tides
Version 3.4 |
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 5:44AM | Sunset 8:02PM | Tuesday August 4, 2020 2:04 AM EDT (06:04 UTC) | Moonrise 9:02PM | Moonset 6:26AM | Illumination 100% |  |
ANZ237 Block Island Sound- 837 Pm Edt Mon Aug 3 2020
.tropical storm warning in effect...
Tonight..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. A slight chance of showers. Isolated tstms after midnight.
Tue..S winds 5 to 10 kt, becoming se 15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 3 to 5 ft. Showers likely. Vsby 1 to 3 nm.
Tue night..S winds 30 to 40 kt with gusts up to 55 kt, becoming sw 15 to 20 kt with gusts up to 35 kt after midnight. Seas 6 to 9 ft. Showers likely. Vsby 1 to 3 nm.
Wed..SW winds 10 to 15 kt. Gusts up to 25 kt in the morning. Seas 5 to 8 ft. A chance of showers.
Wed night..SW winds 5 to 10 kt, becoming W after midnight. Seas 3 to 5 ft.
Thu and Thu night..N winds 5 to 10 kt. Seas 2 to 4 ft.
Fri..E winds around 5 kt. Seas around 2 ft.
Fri night..E winds around 5 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Sat..E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Sat night..NE winds around 5 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 nm. 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.
.tropical storm warning in effect...
Tonight..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. A slight chance of showers. Isolated tstms after midnight.
Tue..S winds 5 to 10 kt, becoming se 15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 3 to 5 ft. Showers likely. Vsby 1 to 3 nm.
Tue night..S winds 30 to 40 kt with gusts up to 55 kt, becoming sw 15 to 20 kt with gusts up to 35 kt after midnight. Seas 6 to 9 ft. Showers likely. Vsby 1 to 3 nm.
Wed..SW winds 10 to 15 kt. Gusts up to 25 kt in the morning. Seas 5 to 8 ft. A chance of showers.
Wed night..SW winds 5 to 10 kt, becoming W after midnight. Seas 3 to 5 ft.
Thu and Thu night..N winds 5 to 10 kt. Seas 2 to 4 ft.
Fri..E winds around 5 kt. Seas around 2 ft.
Fri night..E winds around 5 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Sat..E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Sat night..NE winds around 5 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 nm. 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 837 Pm Edt Mon Aug 3 2020
Synopsis for massachusetts and rhode island coastal waters.. With high pressure sitting east of the waters our main focus will turn to tropical storm isaias as our region remains in the cone of uncertainty Tue into early Wed. Mariners are urged to visit www.nhc.noaa.gov for the latest forecasts regarding this storm. High pres will build back across the waters Wed into Thu. 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.. With high pressure sitting east of the waters our main focus will turn to tropical storm isaias as our region remains in the cone of uncertainty Tue into early Wed. Mariners are urged to visit www.nhc.noaa.gov for the latest forecasts regarding this storm. High pres will build back across the waters Wed into Thu. 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 Weekapaug, RI
Hourly EDIT Helplocation: 41.33, -71.76 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definitionFXUS61 KBOX 040157 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 957 PM EDT Mon Aug 3 2020
SYNOPSIS. Warm and humid weather continues overnight. Showers will move into western parts of southern New England overnight. These showers will move off to the north. After a short break, conditions Tuesday will diminish quickly. Strong locally damaging winds are expected across the region. Heavy rainfall across the western areas could result in some flooding. Minor coastal flooding along the south facing coasts are also expected. Isaias will race rapidly north, and rapidly improving weather will set in for Wednesday. Quiet and seasonable weather will round out the week, with warmer temperatures again for the weekend.
NEAR TERM /UNTIL 6 AM TUESDAY MORNING/.
No significant changes to the forecast. Isaias continues to move up the coast with showers spreading north well ahead of the system. These early showers are supported by the right entrance region of the upper jet over NY/PA . the entrance region bringing lift to an unstable airmass over CT and adjacent areas. Expect the showers to move off/dissipate late at night.
Dew points in in the mid to upper 60s inland and low 70z along the South Coast. Based on that, expect temperatures falling to the upper 60s and low 70s.
SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/. 400 PM update .
What I've got for a forecast is linked to the NHC forecast for Isaias -- along with a lot of behind the scenes collaboration with surrounding offices, NHC, WPC and SPC. Not a lot of time to sneak in meteorology, but I did my best. With the 12z suite coming even more in line with timing (though GFS is still on the quicker side), that does gives some added confidence in some of the details. Still looks like this will be a quick hitting storm, probably 6 to 8 hours that any location deals with it. Figured I'd just run through the various aspects and give some insight into the concerns/questions/uncertainty that goes behind the forecast.
1. Heavy rainfall/Flooding. See the hydro section at the bottom of the AFD
2. Strong Winds. A big concern, and still a lot of uncertainty. All the models for days have been showing Isaias beginning it's transition to extra-tropical as it reaches the area. One of the aspects of this is that the wind fields move away from the core of the storm and expand, especially further east. It's concerning to see a pretty big area of 55-60kt and higher winds at the 925mb level sweep across almost the entire forecast area. Lots of questions as to how much of that will mix down. Feel confident that we'll see 40-50 mph gusts being pretty common for much of the area -- especially closer to the storm center. However models also indicate the potential for narrow bands of convection to develop on the eastern side as well. This would be a mechanism to bring down some of those stronger winds. Thus isolated 60 mph gusts are not out of the question. With fully leafed trees and the winds from a south/southeast direction which is more unusual -- we could see more downed trees than otherwise expected. Of course if Isaias is a bit stronger than currently forecast, that just means more wind.
3. Severe Weather/Tornado Threat. It's the eastern side of the storm again. Huge helicity values 300-600 m2/s2 develop late afternoon/early evening. Bulk shear values are 50kt+. Plus some of the hi-res convective allowing models show bands of convection that suggest embedded small supercells. Pretty classic of landfalling tropical systems. SPC has increased the severe risk to "Slight" for tomorrow. Seems reasonable. Have a feeling we'll have several short lived and small, but still damage causing tornadoes anytime from mid afternoon to late evening.
4. Storm Surge/Coastal Flooding. All available guidance suggests not a huge storm surge, which is good news. But with the timing of the system most likely closely aligned with high tides Tuesday evening around 9pm (and those high tides are already a bit higher than normal due to the full moon), it won't take much to produce minor inundation along south facing coasts. Narragansett Bay and Buzzards Bay have a bit more of our attention as depending on the exact wind direction, we could see a surge be pushed up to the top of the bay. Maybe resulting in a little bit more flooding. At most we are talking 1 or maybe 2 feet of above ground inundation, at least as of right now. If Isaias comes in a little slower or faster and is not quite aligned with high tide, then it changes everything.
Phew. I think that about does it for now. Believe that this won't be an over the top storm, but it's going to be a pain in the backside for a lot of the region -- especially since it's been quite awhile since we've had a tropical system like this one. Irene in 2011 is probably the closest recent analog.
LONG TERM /WEDNESDAY THROUGH MONDAY/. Highlights .
* Some lingering showers post Isaias on Wednesday but not a washout. * Quiet weather for rest of the week with seasonable temperatures. Thursday may be the pick of the week. * There may be possible showers along the south coast on Friday. Otherwise, typical mid summer pattern with scattered showers and thunderstorms developing in the afternoon.
The second half of the week is fairly quiet with high pressure returning and leading to drier weather. Warm with temperatures in the low and middle 80s and muggy on Wednesday with dewpoints near 70 degrees. Much more comfortable weather on Thursday and Friday with dew point falling into the 50s! With high pressure in control, rainfall chances will be lower than normal so these days may be the pick of the week for outdoor activities.
There may be some lingering showers on Wednesday. K index and Total Totals values suggest isolated thunderstorms cannot be ruled out. This is consistent with SPC's current Day 3 outlook depicting general thunder for Eastern MA and RI. Of course, thunderstorm chances will hinge on how quickly Isaias exit the region. But in general, not expecting a washout, especially for our western zones. With mixing up to 850mb and 850mb temperatures between +15 to +17C, expect highs in the mid to upper 80s.
Thursday looks to feature rather strong westerly winds, which will help keep the sea breeze at bay and allow for downsloping effect. A cold frontal passage will also usher in a cooler air mass, with 850mb temperatures falling to +12 to +14C. With mixing up to that level, afternoon highs only top out in the low to mid 80s with upper 70s possible in the high terrain. On Friday, pressure gradient weakens, which will allow for sea breeze development by late morning, keeping coastal areas including Boston cooler than inland locations. For most areas away from the coast, with deep mixing up to 800 mb, dew points in the afternoon would easily drop into the low to mid 50s for many locations away from the coast. So have leaned towards the MOS guidance to lower the dew points. Thursday evening looks to a good radiational cooling night, so have also leaned towards the MOS guidance for widespread upper 50s and low 60s.
Then a disturbance riding along a stalled front to our south may bring some showers to the south coast but confidence is low this far out. But we are more confident in a warming trend beginning Friday afternoon with 60s dew points making a return and temperatures returning to slightly above seasonal normal. For reference, the normal highs for early August are in the low 80s. Still comfortable than of late for Saturday and most of Sunday with dew points in the low 60s but mid 60s dew points return by late Sunday into Monday. So enjoy before the more oppressive humidity makes a return! With a return to mid summer pattern, the weekend will be accompanied by a chance of afternoon thunderstorms but by no means a washout.
AVIATION /02Z TUESDAY THROUGH SATURDAY/. Forecaster Confidence Levels .
Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.
Overnight . Moderate confidence
VFR initially. IFR expected to develop across the Cape and Islands due to low ceilings and fog. Potential for scattered showers in CT and adjacent areas of MA and RI after midnight.
Tuesday . Moderate confidence
Expecting ceilings to lower throughout the day, with MVFR becoming common at most TAF sites. Chances for showers or thunderstorms increase, especially western sections (eg: BDL, BAF). Isaias will be rapidly approaching in the 18z-00z timeframe, and expecting the winds to quickly ramp up during that period.
KBOS Terminal . Moderate confidence in TAF.
KBDL Terminal . Moderate confidence in TAF.
Outlook /Wednesday through Saturday/ .
Wednesday: VFR. Breezy. Chance SHRA.
Wednesday Night through Friday: VFR.
Friday Night: Mainly VFR, with local IFR possible. Slight chance SHRA, patchy BR.
Saturday: VFR. Slight chance SHRA.
MARINE.
Tropical Storm Warnings continue for all coastal waters since the onset of dangerous conditions are within about 24 hours. The primary time period for the strongest winds and highest seas will be later Tuesday and the first half of Tuesday night. Seas will take some time to diminish on Wednesday.
Outlook /Wednesday through Saturday/ .
Wednesday: Winds less than 25 kt. Areas of rough seas. Slight chance of rain showers.
Wednesday Night: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers.
Thursday: Winds less than 25 kt. Seas locally approaching 5 ft.
Thursday Night through Friday: Winds less than 25 kt. Slight chance of rain showers.
Friday Night: Winds less than 25 kt. Chance of rain showers, slight chance of thunderstorms. Local visibility 1 to 3 nm.
Saturday: Winds less than 25 kt. Chance of rain showers, slight chance of thunderstorms.
HYDROLOGY. As of 345 PM .
The exact track of Isaias will make a difference regarding how much rainfall occurs in which portions of southern New England. Precipitable water with Isaias ranges from 2 to 2.5 inches as it makes its closest approach to/through our area, tied into a deep plume of Atlantic moisture.
At this time and based on the forecast track, the highest rainfall with respect to the NWS Boston forecast area is over western MA and north central CT. In particular, a track along or west of the Berkshires would produce a SE/SSE low level upslope flow along the east slopes of the Berkshires and also the higher terrain in western Hartford County. Locally higher rainfall totals are possible in upslope areas. So have issued a Flash Flood Watch from midday Tuesday through Tuesday night for western MA and Hartford County CT.
The main threats in the Flash Flood Watch area are small stream flooding and the potential for significant urban and poor drainage flooding. However, if we manage to get enough intense rain in a broader watershed, it is possible that we could see a larger tributary to the Connecticut River go into flood as well. Antecedent conditions are quite dry with portions of the region in drought, this should hinder more serious flooding.
Further east in our forecast area, rainfall amounts are forecast to drop off, and while we may see some sharp rises on some small streams in the Worcester Hills, the flood threat should be diminished. Thus holding off on an eastward expansion of the FFA at this time.
BOX WATCHES/WARNINGS/ADVISORIES. CT . Tropical Storm Warning for CTZ002>004. Flash Flood Watch from Tuesday afternoon through Wednesday morning for CTZ002. MA . Tropical Storm Warning for MAZ002>024-026. Flash Flood Watch from Tuesday afternoon through Wednesday morning for MAZ002-003-008>011. RI . Tropical Storm Warning for RIZ001>008. MARINE . Tropical Storm Warning for ANZ230>237-250-251-254>256.
SYNOPSIS . WTB/Nash NEAR TERM . WTB/Chai/Nash SHORT TERM . Nash LONG TERM . Chai AVIATION . WTB/Chai/Nash MARINE . WTB/Nash HYDROLOGY .
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for New London, CT
(wind in knots) EDIT (on/off) Help| 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 | 12 AM | 1 AM | |
| Last 24hr | SW G12 | SW G9 | SW G9 | SW G8 | SW G11 | SW G10 | SW G9 | SW G14 | SW G16 | SW G15 | W G20 | W G15 | W G18 | W G18 | SW G15 | SW G13 | SW G12 | SW G7 | SW G9 | SW | SW | SW G6 | W G7 | -- |
| 1 day ago | S | -- | -- | E | SE | S | S | S | S | S G13 | S G16 | SE G14 | SE G12 | SE G12 | SE G16 | S G14 | S G14 | S G14 | S | S G11 | S G10 | S | SW G8 | SW G12 |
| 2 days ago | N | N | N | N | N | N | N | NE | S | SW | SW G10 | S | SW | SW G11 | SW G11 | S | SW | SW | S | S | -- |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Westerly, Westerly State Airport, RI | 3 mi | 72 min | N 0 | 9.00 mi | Fair | 76°F | 72°F | 88% | 1017.9 hPa |
| Block Island State Airport, RI | 14 mi | 69 min | SW 4 | 10.00 mi | Fair | 73°F | 71°F | 94% | 1018.2 hPa |
| Groton / New London, Groton / New London Airport, CT | 15 mi | 69 min | S 3 | 10.00 mi | Fair | 72°F | 69°F | 91% | 1017.4 hPa |
| Montauk, Montauk Airport, NY | 19 mi | 71 min | N 0 | mi | 76°F | 72°F | 88% | 1018.4 hPa | |
Link to 5 minute data for KWST
Wind History from WST (wind in knots)
| 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 | 12 AM | 1 AM | 2 AM | |
| Last 24hr | SW | SW | SW | SW | SW | SW | SW G14 | SW G18 | SW G19 | SW G18 | SW G17 | W G17 | SW G18 | SW G15 | SW | SW | SW | SW | SW | SW | Calm | Calm | SW | |
| 1 day ago | Calm | N | Calm | Calm | Calm | SE | S | S | S | S | S | SE | SE | SE G18 | SE | SE | S | S | S | S | S | SW | SW | |
| 2 days ago | Calm | Calm | Calm | Calm | Calm | NE | S | S | S | S | S | S | S | SW | S | SW | SW | SW | Calm | S | S |
Tide / Current Tables for Watch Hill Point, Rhode Island
EDIT Weekend mode (on/off) (on/off) Help One Week of DataWatch Hill Point
Click for Map
Tue -- 04:04 AM EDT 0.00 feet Low Tide
Tue -- 05:46 AM EDT Sunrise
Tue -- 06:27 AM EDT Moonset
Tue -- 09:45 AM EDT 2.81 feet High Tide
Tue -- 04:05 PM EDT 0.07 feet Low Tide
Tue -- 08:00 PM EDT Sunset
Tue -- 09:01 PM EDT Moonrise
Tue -- 10:05 PM EDT 3.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 04:04 AM EDT 0.00 feet Low Tide
Tue -- 05:46 AM EDT Sunrise
Tue -- 06:27 AM EDT Moonset
Tue -- 09:45 AM EDT 2.81 feet High Tide
Tue -- 04:05 PM EDT 0.07 feet Low Tide
Tue -- 08:00 PM EDT Sunset
Tue -- 09:01 PM EDT Moonrise
Tue -- 10:05 PM EDT 3.13 feet High Tide
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 |
| 1.9 | 1.2 | 0.6 | 0.2 | 0 | 0.1 | 0.6 | 1.4 | 2.1 | 2.7 | 2.8 | 2.5 | 1.9 | 1.2 | 0.6 | 0.2 | 0.1 | 0.2 | 0.6 | 1.4 | 2.2 | 2.8 | 3.1 | 2.9 |
Tide / Current Tables for The Race, Long Island Sound, New York Current
EDIT (on/off) Help One Week of DataThe Race
Click for Map
Tue -- 12:24 AM EDT -0.00 knots Slack
Tue -- 03:28 AM EDT -3.49 knots Max Ebb
Tue -- 05:47 AM EDT Sunrise
Tue -- 06:28 AM EDT Moonset
Tue -- 06:50 AM EDT 0.00 knots Slack
Tue -- 09:41 AM EDT 2.86 knots Max Flood
Tue -- 12:56 PM EDT -0.00 knots Slack
Tue -- 03:49 PM EDT -3.01 knots Max Ebb
Tue -- 06:59 PM EDT 0.00 knots Slack
Tue -- 08:01 PM EDT Sunset
Tue -- 09:02 PM EDT Moonrise
Tue -- 09:50 PM EDT 2.86 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 12:24 AM EDT -0.00 knots Slack
Tue -- 03:28 AM EDT -3.49 knots Max Ebb
Tue -- 05:47 AM EDT Sunrise
Tue -- 06:28 AM EDT Moonset
Tue -- 06:50 AM EDT 0.00 knots Slack
Tue -- 09:41 AM EDT 2.86 knots Max Flood
Tue -- 12:56 PM EDT -0.00 knots Slack
Tue -- 03:49 PM EDT -3.01 knots Max Ebb
Tue -- 06:59 PM EDT 0.00 knots Slack
Tue -- 08:01 PM EDT Sunset
Tue -- 09:02 PM EDT Moonrise
Tue -- 09:50 PM EDT 2.86 knots Max Flood
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 |
| 0.6 | -1 | -2.5 | -3.4 | -3.4 | -2.6 | -1.3 | 0.3 | 1.8 | 2.7 | 2.8 | 2.4 | 1.4 | -0.1 | -1.6 | -2.7 | -3 | -2.5 | -1.4 | 0 | 1.5 | 2.6 | 2.9 | 2.5 |
Weather Map
(on/off) Help Weather Map
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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Boston, MA (2,6,7,8)
(on/off) Help
Ground Weather Radar Station Boston, MA
(on/off) Help
Ad by Google
|
Cookie Policy: This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser. Privacy Policy: I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway. 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. |