Friday, May24, 2019 L-36.com


Marine Weather and Tides
Lake Shore, WA

Version 3.4
What's New / NOTES
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 5:28AMSunset 8:46PM Friday May 24, 2019 10:26 AM PDT (17:26 UTC) Moonrise 12:13AMMoonset 9:39AM Illumination 69% Phase: Waning Gibbous; Moon at 20 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- 331 Am Pdt Fri May 24 2019
In the main channel.. - general seas...3 to 5 feet early this morning, rising to 5 to 7 feet later this morning and continuing through Saturday morning. - first ebb...around 915 am this morning. Seas 6 to 8 feet. - second ebb...around 1015 pm this evening. Seas 6 to 8 feet. - third ebb...around 10 am Saturday. Seas around 8 feet.
PZZ200 331 Am Pdt Fri May 24 2019
Synopsis for the southern washington and northern oregon coast.. A weak cold front is moving se across the coastal waters early this morning, with increasing N to nw winds and seas behind the front today into Saturday. An upper level low will follow, moving south from vancouver island across the pac nw coastal waters Saturday. Weakly forced weather pattern will likely lead to more moderate conditions Sunday and Monday.


7 Day Forecast for Marine Location Near Lake Shore, WA
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location: 45.65, -122.77     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 241611
afdpqr
area forecast discussion
weather service portland or
909 am pdt Fri may 24 2019
updated aviation and marine

Synopsis An upper low will move south down the british columbia
coast and over washington and northwest oregon bringing scattered
showers to the area. Cooler weather will accompany this system with
temperatures falling below normal for the weekend. By Saturday,
colder air will bring snow levels down to the higher cascade passes.

No significant accumulations are expected but those planning
recreation for the holiday weekend will be impacted. Weak ridging
late Sunday and Monday will reduce the shower threat and warm
temperatures back above normal.

Short term Today through Sunday... A shortwave digging down the
british columbia and washington coast today will re-establish a low
over the pacific northwest this afternoon. Surface troughing to the
north of the forecast area has already turned low level onshore flow
more westerly, resulting in a deepening marine layer along the coast
and spreading inland into the western valleys. On satellite images,
evidence of the incoming marine air mass is seen with the intrusion
of marine clouds seen spreading up the lower columbia valley as well
as into the south end of the willamette valley. A second upper low
is expected to drop down and deepen off the coast Saturday, with an
even cooler air mass while adding some mid and upper level moisture.

The increase in moisture, in the low levels today and deeper
Saturday, will bring an increase in cloud cover for today through
Saturday, along with chances for showers to most of the region. The
coolest air aloft moves across late in the day both today and
Saturday, which coupled with diurnal heating will result in the best
instability each day, giving the best chances for showers in the
afternoons and evenings. The subsequent troughs will bring
progressivle lowering snow levels, dipping to 5000 to 6000 ft by
Saturday, although warm ground will make it difficult to sustain
accumulations in all but the heaviest snow showers at that
elevation. The switchover to a marine air mass will result in a
rather substantial drop in high temperatures today and Saturday,
with highs dropping back below seasonal normals.

Saturday night and Sunday the now fairly deep but compact upper low
drops southeast into the desert southwest. This brings the pattern
back to something similar to this past Wednesday, with the forecast
area in the cyclonic flow on the northwest side of the low.

Instability and moisture rotating in from the northeast will put the
main threat for showers and thunderstorms over the cascades, with a
lesser threat for the showers to drift westward back into the inland
valleys. A more northerly low level flow coupled with warming 850 mb
temperatures are likely to allow temperatures in the inland valleys
to warm back into the 70s.

Long term Sunday night through Thursday... No changes. Previous
discussion follows. A broad, strong upper-level trough finally
starts to kick this persistent upper-level ridge that has been
nearly stationary off the west coast off to the east, meaning a
pattern change is in store next week. With the shift of high
pressure inland early next week, we will see partly cloudy skies and
little to no shower activity Tuesday through Thursday. we will also
see temperatures inland get up into the mid-to-upper 70s. Persisting
onshore flow should keep temperatures from getting too warm next
week.

Aviation Generally MVFR conditions across much of the area as
of 16z with ifr along the coast. Best conditions at 16z were in
the interior valleys south of ksle. Astoria profiler and ksle
sounding show the top of the marine layer to around fl040.

Moderate onshore low-level flow continues through tonight.

Coastal areas likely to see an MVFR to ifr mix through sat
morning. Inland areas likely to improve to low-endVFR by 20z,
but fall back into MVFR overnight.

Kpdx and approaches... MVFR at the terminal and vicinity as of
16z. Deep marine layer and moderate onshore flow (kttd-kdls
gradient nearly 4 mb) will continue through tonight. Expect cigs
to be 035-040 by 20z, but lower to MVFR again overnight. Weishaar

Marine No change to current forecast. Nw-n wind gusting to 27
kt at buoy 46089 as 15z. Look for wind speeds 15 to 25 kt this
afternoon through the evening, with the strongest wind over the
outer waters. Wind speeds gradually diminish late this evening
and overnight, but small craft advisory level gusts will continue
over the outer waters. The 12z model runs show marginal small
craft advisory level boundary layer wind speeds over the far ouer
waters sat. The NAM is slightly stronger than the gfs. Current
advisory for pzz270 runs through 18z sat. This may need to be
extended, but will make that decision for the afternoon forecast.

It is more likely that gusts to 25 kt will be more persistent
over pzz275 Sat afternoon.

Wind becomes more northerly Sat night and weakens below advisory
thresholds. However, a surface thermal trough along the south
oregon coast is forecast to strenghten sun, which will result in
20-25 kt gusts for pzz275 and possibly into pzz255 Sun afternoon.

Wave heights continue to build today due to the breezy NW wind
behind the short-wave disturbance. This will be primarily fresh
swell. Seas look to peak around 14 ft over the northwest part of
pzz270 today. Latest guidance shows seas reaching 10 ft in pzz255
this evening and tonight and will be hoisting a small craft
advisory for that zone in the afternoon forecast. Weishaar

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds until 11 am pdt Saturday for
waters from CAPE shoalwater wa to florence or from 10 to
60 nm.

Small craft advisory for hazardous seas until 5 pm pdt Saturday
for coastal waters from CAPE shoalwater wa to cascade head
or out 60 nm.Waters from cascade head to florence or from
10 to 60 nm.

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

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 33 mi44 min 58°F1015.6 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 61 mi44 min 57°F1017.8 hPa
ASTO3 - 9439040 - Astoria, OR 65 mi38 min W 12 G 18

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi33 minSE 510.00 miOvercast56°F48°F77%1015.8 hPa
Portland, Portland International Airport, OR9 mi33 minS 710.00 miLight Drizzle57°F48°F74%1015.9 hPa
Scappoose Industrial Airpark, OR10 mi33 minS 410.00 miOvercast58°F48°F72%1015.3 hPa
Portland-Hillsboro Airport, OR12 mi33 minS 610.00 miOvercast57°F48°F72%1015.5 hPa
Portland, Portland-Troutdale Airport, OR21 mi33 minSSW 125.00 miLight Drizzle55°F50°F83%1016.1 hPa

Wind History from VUO (wind in knots)
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Last 24hrNW3N6SW63S5SW46N8N63NW43N6NW5CalmCalmCalmCalmE3SE3SE4Calm3SE5
1 day agoSE4E6SE5SW46E4CalmNW5E8SE7SE6NW4N53CalmCalmCalm3N4NW3NW645NW6
2 days agoW6NW7NW6NW9NW65NW9
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NW5NW4NW3W4W3NW3NW5NW3CalmCalmCalmCalm3N43E4

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Fri -- 01:12 AM PDT     Moonrise
Fri -- 02:48 AM PDT     1.01 feet Low Tide
Fri -- 04:33 AM PDT     1.08 feet High Tide
Fri -- 05:30 AM PDT     Sunrise
Fri -- 07:34 AM PDT     0.70 feet Low Tide
Fri -- 10:38 AM PDT     Moonset
Fri -- 11:26 AM PDT     1.70 feet High Tide
Fri -- 08:07 PM PDT     -0.00 feet Low Tide
Fri -- 08:44 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.21.111.11.10.90.70.711.41.71.61.30.90.70.60.50.40.2-00.10.51

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Fri -- 12:40 AM PDT     2.81 feet Low Tide
Fri -- 01:18 AM PDT     Moonrise
Fri -- 05:32 AM PDT     Sunrise
Fri -- 05:37 AM PDT     7.33 feet High Tide
Fri -- 10:40 AM PDT     Moonset
Fri -- 01:25 PM PDT     0.18 feet Low Tide
Fri -- 07:42 PM PDT     6.57 feet High Tide
Fri -- 08:50 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.92.93.64.96.37.27.36.85.74.32.91.60.70.20.31.22.64.15.56.46.56.15.24.3

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 (13,3,4,5)
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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.