Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Oroville, 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 6:56AMSunset 5:27PM Wednesday February 20, 2019 4:02 PM PST (00:02 UTC) Moonrise 8:04PMMoonset 8:53AM Illumination 98% 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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7 Day Forecast for Marine Location Near Oroville, WA
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location: 49.16, -119.25     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 202239
afdotx
area forecast discussion
national weather service spokane wa
239 pm pst Wed feb 20 2019

Synopsis
A quiet but cold break period will envelope the region for tonight
through Friday morning. Another round of light to moderate snow
accumulation snow is likely by the end of the week into the
weekend. Cold temperatures will persist well into next week.

Discussion
Rest of today and tonight: a cold upper-level low consisting of 500mb
temperatures around -35c resides over the region. Several
embedded circulations within the trof combined with afternoon
heating has lead to widely scattered snow showers across the
eastern third of wa and N id. The highest concentration of showers
exist across far southeastern wa and the lower idaho panhandle
where the remnants of an inverted trof from last night's storm
system still lingers. Cams and surface observations suggest light
snow continues in these areas but the late february Sun angle has
sufficiently melted most snow off plowed roadways and travel
impacts look minimal. As such, we have taken down the winter storm
warnings with highest impact from this storm now in the books. So
my concern now becomes clusters of showers continuing over these
southeastern zones tonight when the Sun sets and roads cool again
allow for travel impacts. The exact placement and location of
showers carries higher uncertainty and generally should not be as
widespread but could bring the potential for a quick 1-2 inches of
snow. Given the higher elevation of the highways across the camas
prairie, we have kept a winter weather advisory in place for the
evening and will have the evening shift determine if we need to
expand this toward lewiston... Pullman... Pomeroy... Anatone

And peola pending this activity. Further north around spokane
and cd'a... The main 500mb circulation is evident on afternoon
satellite and with the help of a weak northeast boundary and
earlier sunbreaks... Has also resulted in scattered light snow
showers. A few very local bands of moderate snow cannot be ruled
out in which could produce a quick inch before dissipating
otherwise... This will mainly just be a light coating of snow on
objects and possibly roads after sunset. As the low sags
south... Northeast winds will pivot into the basin toward central
wa. This weak boundary will bring one last gasp of shower activity
toward central wa with little to no accumulations.

Temperatures overnight will be quite challenging. Thinking with some
late clearing across the valleys of NE wa and N id... These
locations could dip into the single digits. Light northeast winds
on exposed areas should keep temperatures in the teens. The
cascades will start off clear with the methow valley likely to
radiate quickly but should see clouds increasing overnight.

Locations that received appreciable snow over SE wa and nc id
should hold on to cloud cover and only cool into the teens.

Thursday: high pressure will build over the region delivering a brief
drying trend. We should see a decent amount of sunshine,
especially in the mountains. With skies general clear going into
the evening... Strong radiational cooling will allow temperatures
to plummet quickly but increasing southwest winds ahead of the
next system will bring a chance for increasing moisture and will
lead to a chaotic temperature trend after midnight with lows
warming. With these clouds expected to arrive after midnight... We
could see a lot of single digit temperatures by this time given
light winds and fresh snowpack. Sb
Friday through Sunday... The next in a seemingly endless series of
winter storms will enter the region and lead to deteriorating
conditions during the day on Friday. Currently visible on
satellite as a cold trough over the aleutian islands pushing an
enhanced fetch of pacific moisture into southeast alaska... This
system will drop down the alaska panhandle and the bc coast and
focus the moisture feed into the forecast area from the west
beginning on Friday. This moisture will enhance over another warm
front into light snow over much of the region as the day wears on
followed by a cold front during the night with lingering upslope
snow showers driving into the idaho panhandle through Saturday.

This will be a rather quick hitting storm with the pacific
moisture tap not lingering too long before being directed to the
south into oregon. There does not appear to be any easily
identifiable surface low development either... Leading to
reasonable confidence that this will not be a big snow event for
the region... More of a 1 to 3 inch accumulation in the valleys and
the rim of the basin with perhaps 4 to 6 inches in the mountains
of the idaho panhandle. The deep basin and cascades lee zones as
well as the valleys of the cascades will probably benefit from
a precipitation shadow and be largely skipped over by this
storm... Although the high cascades will pick up significant slop
over accumulations near the crest. Expect only moderate travel
impacts from this storm Friday evening and for Saturday morning
commuters and travelers.

For Saturday through Sunday the GFS and ECMWF models are in good
agreement in stalling the incoming parent trough largely over the
northwestern us with the base of the trough lingering off the
coast. This places the region in a westerly flow regime with an
amorphous but very broad area of surface low pressure over the
region on the cold side of the polar storm track. This suggests a
largely dry basin but continued snow showers into the high
terrain of idaho and slopping over the cascade crest with
continued cold temperatures. On Sunday some buckling in this
westerly flow may allow a warm front to develop over or near the
washington oregon border and make a run into the southern reaches
of the forecast area before stalling for another round of light
snow mainly south of highway 2. Fugazzi
Sunday through Wednesday... Late Sunday into Monday, a stationary
frontal boundary will extend across northern oregon and extend
into central idaho with deepening surface low and associated wave
moving east and northeast along the boundary. Some light snow will
extend north and northeast across the southern columbia basin,
northwest blue mountains, the camas prairie, and the palouse as a
weak warm front briefly extends north. Low confidence in timing
and intensity since model guidance begins to diverge then. Beyond
Monday high pressure will ridge south and southwest across
northeast washington and produce a breezy northeasterly surface
flow across the region and push a cold continental canadian
airmass and bring a continuation of below normal temps through
much of the area. There is, however, the chance of higher wind
gusts through the okanogan valley and the purcell trench through
Tuesday. Aky

Aviation
18z tafs: the most widespread coverage of snow and snow showers
will be across the pullman and lewiston areas today which will
linger into the evening hours. A few bands will have the potential
to be heavy producing snowfall rates near 1" hr. Otherwise... Drier
air is working in the north and northeast and will keep
additional snow shower activity across the remaining terminals
rather light with low probabilities for restrictions. There is a
small chance for patchy fog around wenatchee Thursday morning but
with drier air intruding into the region... Confidence was too low
to include in the 18z issuance. Sb

Preliminary point temps pops
Spokane 13 29 10 27 17 29 20 0 0 50 60 10
coeur d'alene 16 30 11 27 21 30 10 0 0 50 80 10
pullman 16 26 10 28 24 31 40 10 0 20 70 20
lewiston 22 31 15 34 29 37 50 10 0 10 50 30
colville 15 36 13 31 14 36 20 0 0 70 60 0
sandpoint 14 30 11 28 22 31 10 0 0 80 90 30
kellogg 13 29 13 29 24 31 10 0 0 60 80 60
moses lake 19 32 16 31 16 31 10 0 0 30 20 10
wenatchee 19 31 16 29 18 29 10 0 0 60 30 30
omak 18 31 17 26 17 30 10 10 0 50 40 10

Otx watches warnings advisories
Id... Winter weather advisory until 11 pm pst this evening for lewis
and southern nez perce counties.

Wa... None.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Omak Airport, WA50 mi70 minN 1110.00 miFair36°F24°F62%1010.9 hPa

Wind History from OMK (wind in knots)
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Last 24hrS5E5SE5CalmN4N4N6NW5N8N8N9N12N12N11N9N10NW11NW7N14N13N11N12N11N11
1 day agoCalmS6S5SE7S4W3W5W4--NW5CalmCalmSW4W4W4CalmCalmSW4S4SW4CalmS3SE8S8
2 days agoN7N10NW8NW7N11N12W6NW8N12N12NW13NW8
G15
NW10NW10NW10NW9N8N9N9N9N10N7N6N4

Tide / Current Tables for
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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 Spokane, WA (19,4,5,8)
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Ground Weather Radar Station Spokane, WA
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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.