Friday, August23, 2019 L-36.com


Marine Weather and Tides
Onalaska, WA

Version 3.4
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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 6:18AMSunset 8:10PM Friday August 23, 2019 12:53 PM PDT (19:53 UTC) Moonrise 11:10PMMoonset 1:29PM Illumination 42% Phase: Third Quarter Moon; Moon at 23 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- 225 Am Pdt Fri Aug 23 2019
In the main channel.. - general seas...around 3 to 5 feet through Friday. - first ebb...around 1015 pm Thursday. Seas building to 7 feet. - second ebb...around 1030 am Friday. Seas building to 5 feet. - third ebb...around 1115 pm Friday. Seas building to 5 feet.
PZZ200 225 Am Pdt Fri Aug 23 2019
Synopsis for the southern washington and northern oregon coast.. High pressure over the waters with a thermal low along the north california and south oregon coast will continue through Friday. A trough temporarily weakens the high pressure during the weekend.


7 Day Forecast for Marine Location Near Onalaska, WA
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location: 46.51, -122.63     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 231636
afdsew
area forecast discussion
national weather service seattle wa
936 am pdt Fri aug 23 2019

Synopsis
A ridge of high pressure will be forced south today as a trough
pushes through central bc. This will bring some showers, cloudier
skies, and temperatures ranging from near to below normal. By
Sunday, high pressure will build back into the area through the
middle of next week. This will bring dry weather and temperatures
climbing well above normal by the middle of the week.

Short term today through Sunday
Radar showing showers sliding across the northern tier this
morning. A quick update to bump chances up and include mention of
showers to the north. Satellite depicts mid level cloudiness
steadily pushing across the southern half of the area but with a
fair amount of breaks. Temperatures look on track to top out from
the 60s to mid 70s today. Additional chances of showers tonight
and Saturday, with the greatest likelihood on the coast and
olympic peninsula. Will update to increase pops there as well to
reflect ensemble output and euro trend to continue shower chances
tomorrow in those areas. Highs tomorrow will be very similar to
today. The trough will exit east on Sunday but with a few
lingering showers along the far northern tier of the forecast
area. Heights will be slow to rise on Sunday and expect that the
warming trend will be somewhat slower Sunday with temperatures
rising only a couple degrees from the previous days to top out in
the upper 60s to mid 70s again. More appreciable increases in
500mb heights are expected overnight Sunday as the strong ridge
anchored through northern california extends north as the trough
exits well east.

Long term Monday through Thursday
The trend for this coming week continues to be one of drying and
warming conditions. This ridge of high pressure to the south will
continue to build north. While heights get into the mid 580s, it
is noted that 850mb temps should exceed +20c by Tuesday and
Wednesday, along with a low level offshore flow. Thus Tuesday and
Wednesday should range from very warm to hot across the area.

Widespread low to mid 80s with some upper 80s south by Tuesday,
and a notch warmer for Wednesday with low 90s likely from seattle
southward. The combination of 850mb temps in excess of 21 to 24c
on Wednesday and the presence of a thermal trough along the coast
suggest Wednesday to be the hottest. At least a weak push and cool
down on Thursday with the strength a bit uncertain at this time.

European model solutions are fairly aggressive in cooling things
off on Thursday with a weak mid level trough pushing in more rapidly.

Extended looks dry. Will fine tune heat forecasts over the next
couple of days.

Aviation The upper level flow has become more zonal this morning
with a weak system passing through the northern section of
washington, while at the surface, the flow continues to remain
onshore as higher pressure remains located across the ocean.

Associated with the upper level weather system is a rain shield
extending from the canadian border into the northern olympic
peninsula. This morning have added a tempo group for showers from
clm to bli. Will keep a watch on pae. Elsewhere the best chance for
showers will remain displaced to the north.

Some ground fog lifr conditions has affected olm this morning and
expect these conditions to improve over the next hour or so. Some
patchy stratus exists along the coast but appears to be sparing hqm.

ElsewhereVFR conditions with mid and high clouds. The trend will be
forVFR conditions to continue thru the day with bkn 10k-20k ft
likely the rule. Onshore flow will likely allow stratus to push
further inland tomorrow and affect ceilings. Winds today generally
n NE 5-10kts.

Ksea... Will continue to monitor rain showers west and north of the
area today but think activity will largely remain north. Ceilings
will beVFR at sct-bkn 10k-20k ft. Some stratus may push inland
close to the terminal Saturday morning. Winds N at 10kts or less.

Kovacik

Marine Mid and upper flow becoming more zonal today with a weak
shortwave passing through the northern section of the area and
southern bc. This shortwave is carrying with it some shower activity
thru the strait into the northern inland waters and admiralty inlet.

This will likely continue into the afternoon before the system pulls
to the north and east. Winds and waves are rather tranquil this
morning, with no headlines currently in effect.

Later this afternoon and evening, typical westerly push down the
central and eastern strait of juan de fuca will lead to the next
round of small craft advisory winds. Will monitor data coming in
later this morning afternoon to determine whether this advisory will
need to be expanded into admiralty inlet and northern inland waters.

Onshore flow will then continue into the weekend with the potential
for near-gale force winds on Saturday evening. The flow is then
expected to turn offshore around Tuesday and continue thru late next
week.

Kovacik

Hydrology The daily hydrology discussion has ended until the
start of the next rainy season; it will only be updated as needed
until then.

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory until 3 am pdt early this morning for
central u.S. Waters strait of juan de fuca-east entrance
u.S. Waters strait of juan de fuca.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 33 mi53 min 71°F1014.1 hPa (-1.3)
TCMW1 - 9446482 - Tacoma Met, WA 54 mi59 min NW 7 G 9.9
TCNW1 - 9446484 - Tacoma, WA 54 mi59 min 63°F 56°F1015.5 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chehalis-Centralia Airport, WA22 mi78 minVar 56.00 miFair with Haze72°F57°F61%1014.9 hPa

Link to 5 minute data for KCLS

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Last 24hrCalmCalmCalm543NE7--Calm--CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE84
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Calm------CalmCalm--CalmCalmCalm--S6S6CalmS43S6S10
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Tide / Current Tables for Longview, Washington - IGNORE HEIGHTS
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Longview, Columbia River, Washington
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map and Satellite Images
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wmap_P
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Seattle, WA (15,3,4,5)
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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.