Wednesday, April8, 2020
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Marine Weather and Tides
Point Roberts, WA

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 6:31AMSunset 7:56PM Wednesday April 8, 2020 11:15 AM PDT (18:15 UTC) Moonrise 8:00PMMoonset 6:19AM 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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PZZ133 Northern Inland Waters Including The San Juan Islands- 846 Am Pdt Wed Apr 8 2020
Today..NW wind 5 to 15 kt. Wind waves 2 ft or less.
Tonight..NW wind 5 to 15 kt becoming N to 10 kt after midnight. Wind waves 2 ft or less.
Thu..NW wind to 10 kt. Wind waves 1 ft or less.
Thu night..W wind to 10 kt becoming sw after midnight. Wind waves 1 ft or less.
Fri..SW wind to 10 kt in the morning becoming light. Wind waves 1 ft or less.
Fri night..W wind to 10 kt. Wind waves 1 ft or less.
Sat..NW wind to 10 kt. Wind waves 1 ft or less.
Sun..NE wind to 10 kt becoming nw. Wind waves 1 ft or less.
PZZ100 846 Am Pdt Wed Apr 8 2020
Synopsis for the northern and central washington coastal and inland waters..Light northerly flow today. Onshore flow will return late in the week as a series of weak systems affect the area.


7 Day Forecast for Marine Location Near Point Roberts, WA
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location: 48.98, -123.08     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 081632 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 932 AM PDT Wed Apr 8 2020

UPDATE. Satellite showing mostly sunny skies across the region this morning, with only a few high clouds passing overhead. A few spots of shallow, patchy fog remain across the southwest interior as of 830 AM, but have already started to dissipate. Otherwise, no changes were needed to the morning forecast. The previous discussion follows below, with updates made to the aviation and marine sections. SB

SYNOPSIS. An overall quiet weather pattern is expected over the next 7 days. Weak ridging today will make for dry and mostly sunny conditions, with this feature flattening by Thursday as NW flow aloft sets in. A weak front will increase cloud cover through Friday, with a weak wave then bringing a few showers Friday night/Saturday. Dry conditions then return through early next week.

SHORT TERM /TODAY THROUGH FRIDAY/. Around 09z this morning the synoptic pattern was characterized by a blocking pattern across the NE Pacific (more specifically, an omega block), with ridging portion extending from the Pacific into the Pacific Northwest and downstream closed low centered just offshore the southern California coastline. A split-flow pattern then exists downstream of this blocking feature across the majority of the CONUS east of the Rockies. In the lower levels, a weak trough was noted from northern California to just offshore the WA and OR coasts, with Canadian high pressure nosing down from BC and Alberta into the Northern Rockies and Northern Great Plains.

Based on the pattern described above, conditions are relatively benign across western Washington this morning, and this will continue through the day today. The lower level flow will argue for weak offshore flow given light gradients, so marine stratus is not expected this morning (tho spotty patches of fog may develop). Overall today expect nothing more than a few passing high clouds. High temperatures should reach the lower 60s :)

Later this evening and overnight, higher level cloud cover is likely to increase as an organized shortwave trough traverses the Gulf of Alaska into northern BC and carries a frontal boundary with it. High/mid level cloud cover is likely to stick around through much of Thursday and into Friday as the frontal boundary slowly sinks south towards the local area. The parent shortwave is expected to evolve into a closed area of low pressure across the NW Territories Thursday night and dig slowly SE into Friday morning. This will help turn the upper level flow across the Pacific Northwest more NW, which will allow some of the lingering moisture from the dissolving frontal boundary to spill into the area. Extra cloud cover is likely as this occurs, though will likely see generally dry conditions (cannot rule out a few late day showers Friday, esp across the higher terrain). Overall, a tranquil and dry short term forecast is in store.

Kovacik

LONG TERM /SATURDAY THROUGH TUESDAY/. Northwest flow aloft will carry into the long term forecast period across the Pacific Northwest. A shortwave trough will migrate through the upper level flow Friday night into early Saturday morning. It appears organized enough to generate some shower activity across the eastern half of the CWA, again particularly the higher terrain. Best/deeper moisture may remain displaced to the east of the area across the Northern Rockies.

The passage of this shortwave trough looks to initiate a pattern change. As the shortwave trough moves south, model guidance is suggestive of it merging with a southern stream shortwave trough and assist in the deepening of a longwave trough across the central CONUS, with a highly amplified ridge becoming reinforced over Alaska. This will place western Washington in continued dry NW aloft in between these features through the remainder of the weekend and into early next week. Ensemble guidance thereafter would argue right now for slight progression of the pattern through mid week, which would bring ridge closer to the region and keep for dry conditions.

Kovacik

AVIATION. Northwest flow aloft with light northerly flow at the surface. A few high clouds otherwise clear skies. Patchy fog has started to lift over the SW interior . bu a few isolated locations there may see visibility reductions through 18Z this morning. Otherwise . VFR conditions in place and expected to continue for all TAF sites throughout the TAF period.

KSEA . VFR with northerly winds 8 to 12 kts into this evening before subsiding to around 5 kts tonight.

CEO/SMR

MARINE. Northerly flow today with onshore flow returning later in the week as a few weak systems brush the area. Potential for SCA level winds in the Strait at times Thursday and Friday . and will evaluate that threat with incoming 12Z data for any potential headlines for the afternoon forecast product. Otherwise, generally quiet weather continues.

CEO/SMR

HYDROLOGY. No river flooding expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . None.

www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHYW1 - 9449424 - Cherry Point, WA 19 mi46 min 1027.9 hPa
CPMW1 19 mi52 min NW 5.1 G 8 46°F
CPNW1 19 mi64 min WNW 7 G 8 45°F
FRDW1 - 9449880 - Friday Harbor, WA 30 mi40 min NE 4.1 G 7 48°F 47°F1027.7 hPa
46146 - Halibut Bank 42 mi76 min WNW 12 G 14 45°F 48°F1 ft1028 hPa (+0.4)
46088 - New Dungeness, WA (Hein Bank) 45 mi36 min NNW 9.7 G 12 46°F1028.8 hPa
SISW1 - Smith Island, WA 47 mi26 min NNW 4.1 G 7 47°F 1028 hPa37°F
PBFW1 - Padilla Bay Reserve, WA 48 mi46 min NNW 7 47°F 1027 hPa40°F

Wind History for Cherry Point, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Eastsound, Orcas Island Airport, WA21 mi21 minNNW 99.00 miA Few Clouds48°F41°F76%1027.8 hPa

Link to 5 minute data for KORS

Wind History from ORS (wind in knots)
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Last 24hr5N5NW5NE6NE5N5N5NW3N3CalmS3CalmCalmS3CalmCalmCalmCalmCalmCalmCalmNE3N43
1 day agoN5CalmN5N4N444N5NW3CalmS5S6S5S6S5S4S3SE3S4CalmCalmCalmCalmN3
2 days agoN5NW6NW8NW9NW8NW9NW54NW3CalmCalmCalmCalmS4S3CalmCalmCalmCalmCalm34CalmCalm

Tide / Current Tables for Samuel Island (North Shore), British Columbia
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Samuel Island (North Shore)
Click for Map
Wed -- 12:11 AM PDT     5.14 feet Low Tide
Wed -- 06:30 AM PDT     12.98 feet High Tide
Wed -- 06:34 AM PDT     Sunrise
Wed -- 07:19 AM PDT     Moonset
Wed -- 12:51 PM PDT     3.91 feet Low Tide
Wed -- 07:21 PM PDT     12.32 feet High Tide
Wed -- 07:55 PM PDT     Sunset
Wed -- 09:01 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.25.56.78.510.311.912.912.911.910.17.95.84.33.94.66.189.911.412.312.111.29.78

Tide / Current Tables for Boat Passage, British Columbia Current
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Boat Passage
Click for Map
Wed -- 01:56 AM PDT     5.00 knots Max Flood
Wed -- 05:01 AM PDT     -0.00 knots Slack
Wed -- 06:34 AM PDT     Sunrise
Wed -- 07:19 AM PDT     Moonset
Wed -- 08:16 AM PDT     -5.41 knots Max Ebb
Wed -- 11:21 AM PDT     0.00 knots Slack
Wed -- 02:27 PM PDT     5.39 knots Max Flood
Wed -- 05:42 PM PDT     -0.01 knots Slack
Wed -- 07:55 PM PDT     Sunset
Wed -- 08:44 PM PDT     -4.85 knots Max Ebb
Wed -- 09:01 PM PDT     Moonrise
Wed -- 11:45 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.74.454.32.50.1-2.4-4.4-5.4-5-3.5-11.745.35.23.91.7-0.8-3-4.5-4.8-3.9-1.9

Weather Map
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wmap_P
GEOS Local Image of PacificNorthwest    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 Seattle, WA (14,3,4,5)
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Ground Weather Radar Station Seattle/Tacoma, WA
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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.