Thursday, February21, 2019 L-36.com


Marine Weather and Tides
Onalaska, 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 7:03AMSunset 5:46PM Thursday February 21, 2019 2:41 PM PST (22:41 UTC) Moonrise 8:40PMMoonset 8:33AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 228 Pm Pst Thu Feb 21 2019
.small craft advisory for rough columbia river bar in effect until 8 pm pst this evening...
.small craft advisory for rough columbia river bar in effect from late tonight through Friday morning...
In the main channel.. - general seas...7 ft tonight and Friday. - first ebb...very strong ebb around 615 pm Thursday. Seas building to 11 ft with breakers. - second ebb...strong ebb around 645 am Friday. Seas building to 11 ft with breakers possible. - third ebb...strong ebb around 7 pm Friday. Seas building to 11 ft with breakers possible.
PZZ200 228 Pm Pst Thu Feb 21 2019
Synopsis for the southern washington and northern oregon coast.. High pressure remains offshore over the ne pac this week. A frontal system will move down the coast Fri and Fri night, followed by a weak low Sat night and Sun.


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 211728
afdsew
area forecast discussion
national weather service seattle wa
928 am pst Thu feb 21 2019

Synopsis Dry northerly flow will continue today for sunny skies
and quiet weather. A frontal system will arrive from the
northwest on Friday. A cool upper trough will follow the front for
the weekend into the early part of next week. Low snow levels
will continue through the period.

Short term today through Saturday Dry, northerly flow will
prevail today for sunny skies. We're off to a chilly start (temps in
the 20s to 30s) but we'll warm back up into the lower to mid 40s
this afternoon. The current forecast is on track. 33
previous discussion... The leading edge of the next frontal system
looks to hold off until early Friday morning with best threat of
widespread precip waiting until the late morning to afternoon
hours. Interior snow levels will be pretty low during the morning
hours... So any precip that kicks off early will likely be snow or
a rain snow mix. As already mentioned however... Lowland amounts
during this time period are expected to be light. By the time pops
climb into likely category... Snow levels will have jumped to or
near 1000 ft... Almost 2000 ft along the coast... And as such
remainder of precip expected to fall as rain. The front moves on
Friday night but a broad area of upper level low pressure will
remain... Keeping an active... Showery period over the CWA for the
bulk of the weekend. As the core upper level low finally
approaches the area Sunday... The system looks to stall. This will
keep the prospect for showers in the forecast for the bulk of the
cwa... However model disagreement on the actual position of the low
may allow for the northernmost quarter of the CWA to meet with
dry conditions. Given model disagreement... Confidence in this is
fairly low... But no harm in positive thinking at this point in the
winter.

Snow levels during the short term will oscillate between 1000-2000 ft
during the day and 500 ft to near sea level during the overnight
hours. As such... The threat for snow or mixed precip never really
goes away. The plus side of this is that any lowland snow that does
occur will be minimal with not much in the way of accumulations
expected... And any localized accumulations that do occur will be
gone by mid to late afternoon. Adding more proof to minimizing any
snow threat will be both high and low temps throughout the
period... With highs in the low 40s and overnight morning lows either
right around freezing or 2-3 degrees above. At the very least... One
can surmise that the gradual march into... Well... March may finally
be taking a bit of the sting out of our lingering winter weather.

Smr

Long term Sunday through Wednesday Previous discussion... Models
fall seriously out of sync for Monday... As the ECMWF takes the
upper low out into the pacific and allows for a minor upper level
ridge to take root Monday into Tuesday. The GFS shows this
happening too... Just almost 24 hours later than its euro
counterpart. And the current runs remain out of phase like this
for the remainder of the forecast period... Although... Again... Their
general patterns remain fairly similar... Generally dry conditions
early next week followed by a return to active weather offset by
a gradual climb in snow levels and daytime highs during the middle
of the week. Needless to say... Even though specifics are hard to
come by and confidence remains low... The general trend seems to
show that any future lowland appearances of that other four letter
s word... Snow... May have to wait until next winter. Smr

Aviation North to northeasterly flow will ease across the north
interior, and remain generally below 10 to 15 kt across western
washington. Patchy stratus is nearly dissipated andVFR skies
are expected through this evening. Light flow aloft will become
moderate southerly flow tonight under high pressure ahead of a
frontal system. An upper trough and associated surface front will
move into the region Friday morning. Light rain will develop by 18z
Friday at most TAF locations, with areas of MVFR cigs. Precipitation
will become showery but clouds will persist.

Ksea... North wind to 10 kt.VFR skies through most of tonight. High
and mid-level clouds increase tonight and lower to MVFR toward 15-
18z Friday as rain spreads into the area with the next frontal
system. Surface winds n-ne 5 to 10 knots today shifting to southerly
near or after 06z tonight. Dtm

Marine Northeasterly offshore flow will continue to ease this
afternoon and turn southerly tonight as high pressure over british
columbia shifts to the southeast and a front approaches from the
northwest. Westerly swell 10-12 feet will continue to subside this
afternoon and evening. The gradients in the strait and the northern
interior waters have eased and will continue to remain below small
craft criteria.

The aforementioned frontal system will move through the area on
Friday. A trailing weak low over haida gwaii will move to oregon
Saturday and Saturday night.

Northeasterly offshore flow will develop on Sunday and continue into
Monday with high pressure over british columbia and low pressure
over oregon. Schneider dtm sb

Hydrology River flooding is not expected for the next 7 days.

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory for hazardous seas until 8 pm pst this
evening for coastal waters from CAPE flattery to james
island 10 to 60 nm-coastal waters from CAPE flattery to
james island out 10 nm-coastal waters from james island to
point grenville 10 to 60 nm-coastal waters from james
island to point grenville out 10 nm-coastal waters from
point grenville to CAPE shoalwater 10 to 60 nm-coastal
waters from point grenville to CAPE shoalwater out 10 nm.

Small craft advisory for rough bar until 8 pm pst this evening
for grays harbor bar.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 33 mi60 min 41°F1019.7 hPa
TCMW1 - 9446482 - Tacoma Met, WA 54 mi60 min N 8 G 9.9
TCNW1 - 9446484 - Tacoma, WA 54 mi60 min 45°F 48°F1020.7 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chehalis-Centralia Airport, WA22 mi47 minVar 310.00 miA Few Clouds48°F30°F50%1019.6 hPa

Wind History from CLS (wind in knots)
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Last 24hrE8N7
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N4CalmCalmN5N6NW7NE5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE9N75
1 day agoW55S6S4S6S4CalmS4SE4S4S3SE4CalmCalmSW3CalmCalmCalmN4N4NE6NE9N8NE9
2 days agoS74CalmCalmSW3CalmCalmSW4S6SW4S4SW3S5S3S45SW3SW4S5SW4S4S5S8S5

Tide / Current Tables for Olympia, Washington
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Olympia
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Thu -- 12:32 AM PST     -1.26 feet Low Tide
Thu -- 07:06 AM PST     Sunrise
Thu -- 07:10 AM PST     16.76 feet High Tide
Thu -- 08:34 AM PST     Moonset
Thu -- 01:18 PM PST     3.89 feet Low Tide
Thu -- 05:44 PM PST     Sunset
Thu -- 06:41 PM PST     14.22 feet High Tide
Thu -- 08:41 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1-114.58.712.715.516.716.214.311.385.344.36.39.111.913.814.21310.87.64.3

Tide / Current Tables for Nisqually Reach, Washington Current
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Nisqually Reach
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Thu -- 01:13 AM PST     0.00 knots Slack
Thu -- 04:12 AM PST     1.59 knots Max Flood
Thu -- 07:05 AM PST     Sunrise
Thu -- 07:22 AM PST     -0.01 knots Slack
Thu -- 08:33 AM PST     Moonset
Thu -- 10:48 AM PST     -1.45 knots Max Ebb
Thu -- 01:49 PM PST     0.00 knots Slack
Thu -- 04:25 PM PST     1.14 knots Max Flood
Thu -- 05:43 PM PST     Sunset
Thu -- 06:58 PM PST     -0.00 knots Slack
Thu -- 08:40 PM PST     Moonrise
Thu -- 10:44 PM PST     -1.78 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.1-0.20.61.31.61.410.3-0.5-1-1.4-1.4-1.2-0.70.10.71.11.10.6-0-0.7-1.3-1.7-1.8

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 Seattle, WA (17,4,5,8)
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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.