Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Puget Island, WA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:22AMSunset 8:05PM Sunday August 25, 2019 9:48 AM PDT (16:48 UTC) Moonrise 12:00AMMoonset 3:44PM Illumination 24% Phase: Waning Crescent; Moon at 25 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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PZZ210 Columbia River Bar- 321 Am Pdt Sun Aug 25 2019
In the main channel.. - general seas...3 to 5 feet today through Monday. - first ebb...around 1 pm this afternoon. Seas temporarily building to 6 ft. - second ebb...around 145 am Monday. Seas temporarily building to 7 ft. - third ebb...around 215 pm Monday afternoon. Seas temporarily building to 6 ft.
PZZ200 321 Am Pdt Sun Aug 25 2019
Synopsis for the southern washington and northern oregon coast.. High pressure will strengthen over the ne pacific Sunday and Monday, while thermal low pressure builds northward along the northern ca and southern or coast. Thermal low pressure is expected to continue building northward into western oregon Tuesday and Wednesday.


7 Day Forecast for Marine Location Near Puget Island, WA
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location: 46.16, -123.41     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 251057
afdpqr
area forecast discussion
national service portland or
354 am pdt Sun aug 25 2019

Synopsis Another weak upper level disturbance will slide well
north of the area early today, with another seasonable day across the
region. High pressure aloft strengthens early this week over the
pacific northwest with offshore low-level developing Monday and
Tuesday, maintaining above normal temperatures across the forecast
area.

Short term Sunday through Tuesday... Westerly flow aloft continues
across the region early this morning with light onshore low-level
flow. This has resulted in stratus development across much of the
area, and latest satellite imagery suggests this stratus field is
continuing to expand across the interior lowlands of the region. With
only modest onshore flow continuing through the day, expect that
stratus should scatter and clear this morning, for a mostly sunny
afternoon and afternoon high temperatures similar to those observed
yesterday, or within a few degrees of seasonal normals.

A shift to a much warmer pattern will be underway late today and into
early Monday as an upper level disturbance across southern b.C.

Shifts eastward, allowing 500 mb heights rise to nearly 590 dam over
northwestern oregon Monday as a strong ridge builds across the
pacific northwest. Not expecting much, if any, morning stratus Monday
with northerly low-level flow becoming established. Temperatures
should push to near 70 for the coastal areas and well into the mid
80s across the interior portions of the forecast area. Low-level flow
should turn offshore Monday and Tuesday in response to a building
thermal trough over the region, and the ridge continues to strengthen
into Tuesday with temperatures surging well into the 90s. Tuesday
will likely be the warmest day for the coastal areas given the
offshore flow. Increased temperatures a bit for these areas, but
ultimately may need to continue this trend if it appears the offshore
flow will be sufficiently strong. Meanwhile, temperatures across the
southern willamette valley will likely push into the upper 90s,
potentially reaching a record maximum temperature for the date.

Breezy offshore winds will also develop, with gusts to around 30 mph
possible in the afternoon Tuesday. cullen

Long term Tuesday night through Saturday... Confidence in the
details of temperature forecast for Wednesday is a bit lower than
Tuesday for much of the area. Offshore flow should weaken as the
thermal trough pushes offshore, eventually opening the door to
sea-breeze influence in the afternoon to cap the coastal
temperatures. Meanwhile, a southerly wind reversal will likely push
some marine stratus and much cooler air into the region by late
Wednesday. For this reason, expect that some of this influence may
push into the southern willamette valley and keep maximum
temperatures slightly cooler. Temperatures in the portland metro
area may be similar, or perhaps slightly warmer than Tuesday, but
model guidance continues to suggest a surge of mid upper level
moisture will move from the south southwest into the forecast area.

This could take the form of scattered clouds or simply more humid
air, either of which could be factors that would limit warming a
little. Regardless, two very hot days expected across much of the
region.

Model guidance continues to suggest a surge of mid-level moisture
into the region late Wednesday and into Thursday with pw values
approaching 1.25-1.50". Additionally, modest instability will likely
exist as a weak impulse rides over the top of the weakening ridge and
moves across the region. Continued to indicate a slight chance for
thunderstorms near the crest of the oregon cascades Thursday
afternoon evening in line with this. Meanwhile, temperatures
gradually trend back toward normal values late in the week. However,
latest guidance is in good agreement slowing down the arrival of the
next weather system. This will allow heights to actually build a bit
for the Friday Saturday time period and keep the onshore flow quite
weak. As a result, kept the trend for cooling very gradual and
maintained temperatures on the warmer end of the envelope of
guidance. Due to this, have maintained a dry forecast for the start
of the labor day weekend, with any mention of rain chances holding
off until after the end of the week. Cullen

Aviation Quite the variety of flying conditions across the
forecast area as of 1030z, ranging from clear skies across
roughly one half of the forecast area to local ifr fog in some
coastal valleys. Low clouds have thus far failed to congeal along
the coast, likely due to a somewhat weak marine inversion.

Further inland, onshore flow is causing MVFR CIGS to bank up
against the cascade foothills, with MVFR affecting keug the past
couple of hours. There is also a cloud deck around 045-055 msl,
but this appears to be fading as drier air moves in aloft.

Most likely outcome for this morning will be increasing areas of
MVFR, mainly for areas east of interstate 5, while many areas
west of i-5 remainVFR. It still appears unlikely kpdx and kttd
will remainVFR all the way through this morning, as MVFR cigs
build westward from the cascade foothills. As warmer air moves in
aloft, the marine inversion will become stronger but shallower,
possibly causing more widespread MVFR to form along the coast as
well. Additionally, north winds will become rather brisk along
the central or coast this afternoon with gusts 25-30 kt likely
konp southward.

Kpdx and approaches...VFR conditions are tenuous this morning,
and it still appears likely some MVFR CIGS will develop around
the portland metro area by 14z. Any CIGS that form would likely
clear toVFR by 19z. Weagle

Marine High pressure is strengthening over the NE pacific this
morning, while thermal low pressure strengthens along the coast
near the or ca border. This will cause n-nw winds to increase
across our coastal waters this afternoon, with gusts to 25 kt
appearing likely south of tillamook head. While there may be some
brief easing near the immediate coastline late tonight and early
Monday morning, winds will remain strong beyond 5-10 nm offshore.

Winds strengthen further Monday afternoon and evening, with local
gale force gusts to 35 kt possible across our southern waters...

especially near capes. The strong winds will drive very steep
wind waves, with seas as high as 9 ft with average periods of 6
or 7 seconds.

The thermal trough over southern oregon will build northward into
the north oregon waters Tuesday and Wednesday. This may push the
stronger winds further offshore by midweek, and may open the door
for a southerly wind reversal Tuesday night or Wednesday. Weagle

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory from noon today to 11 am pdt Tuesday for
waters from CAPE shoalwater wa to florence or from 10 to
60 nm.

Small craft advisory from noon today to 11 pm pdt this evening
for coastal waters from CAPE shoalwater wa to cascade head
or out 10 nm.

Small craft advisory from noon to 11 pm pdt Monday for coastal
waters from CAPE shoalwater wa to cascade head or out 10
nm.

Small craft advisory from noon today to 11 pm pdt Monday for
coastal waters from cascade head to florence or out 10 nm.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 19 mi49 min WNW 4.1 G 6 62°F 69°F1021.6 hPa (+1.5)
LOPW1 - 9440422 - Longview, WA 24 mi49 min 70°F1022.1 hPa (+1.9)
46243 - Clatsop Spit, OR - 162 38 mi49 min 64°F5 ft
TOKW1 - 9440910 - Toke Point, WA 48 mi49 min NNW 5.1 G 7 62°F 65°F1021.8 hPa (+1.5)

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR25 mi54 minESE 310.00 miPartly Cloudy62°F55°F80%1021.8 hPa

Link to 5 minute data for KAST

Wind History from AST (wind in knots)
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Last 24hr36SW8SW83NW6NW8NW10W10NW7----NW7------NW8--CalmCalmS3E4E4SE3
1 day agoE4N8NW4N9N7W11NW15NW13
G18
NW10NW14--NW10----NW6--SE4CalmCalmSE5SE3SE3CalmSE4
2 days ago3NW6N7N8NW7W10NW11NW11NW12NW12----N8--Calm----SE4E3Calm--SE5SE4Calm

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Sun -- 12:55 AM PDT     Moonrise
Sun -- 04:44 AM PDT     0.37 feet Low Tide
Sun -- 06:25 AM PDT     Sunrise
Sun -- 10:50 AM PDT     5.36 feet High Tide
Sun -- 04:17 PM PDT     2.50 feet Low Tide
Sun -- 04:44 PM PDT     Moonset
Sun -- 08:06 PM PDT     Sunset
Sun -- 09:52 PM PDT     7.42 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.53.11.910.50.40.91.93.14.35.15.454.33.52.82.52.73.54.86.27.17.47

Tide / Current Tables for Settlers Point, Columbia River, Oregon
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Settlers Point
Click for Map
Sun -- 12:55 AM PDT     Moonrise
Sun -- 04:39 AM PDT     0.33 feet Low Tide
Sun -- 06:26 AM PDT     Sunrise
Sun -- 10:43 AM PDT     5.02 feet High Tide
Sun -- 04:12 PM PDT     2.80 feet Low Tide
Sun -- 04:44 PM PDT     Moonset
Sun -- 08:06 PM PDT     Sunset
Sun -- 09:45 PM PDT     7.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.22.91.70.90.40.40.91.934.14.854.74.13.532.833.856.277.16.7

Weather Map and Satellite Images
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GOES 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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Wind Forecast for Portland, OR (12,3,4,5)
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Ground Weather Radar Station Portland, OR
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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.