Saturday, January19, 2019 L-36.com


Marine Weather and Tides
Spokane Valley, 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 7:27AMSunset 4:31PM Saturday January 19, 2019 6:52 PM PST (02:52 UTC) Moonrise 4:02PMMoonset 7:02AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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 Spokane Valley, WA
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location: 47.64, -117.19     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 200016
afdotx
area forecast discussion
national weather service spokane wa
416 pm pst Sat jan 19 2019

Synopsis
The next round of rain and snow is expected across southeast
washington into the idaho panhandle late tonight into Sunday
evening. High elevation snow is possible especially in the central
idaho panhandle and camas prairie. The active pattern will
continue early in the week with the potential of lowland snow
Tuesday night into Wednesday. Expect dry and cool weather late
next week.

Discussion
Tonight through Sunday night: moist southwest flow prevails across
the inland northwest. Saturated boundary layer with low level
southwest flow has kept low and mid level clouds across the
lowlands. Patchy fog looks to linger and possibly increase
overnight. Upslope showers over the cascade crest will gradually
decrease. Meanwhile a frontal boundary continues to slip south
with light rain and high elevation snow showers. Overnight, an
upper level trough approaches the oregon coast as a surface low
spins up over western oregon and tracks toward northeast oregon.

Low center will push the frontal boundary northward once again
with a deformation band spanning across southeast washington and
the southern idaho panhandle with an increasing threat of
precipitation moving in from the south. There is good run to run
consistency in the models of the arrival of the precipitation
overnight into Sunday, the disagreements evolve on how far north
it will creep. The current cloud deck should limit cooling
overnight with most low lands remaining at or above freezing. This
will lead to higher terrain snow that will see several inches of
snow accumulations, especially from the top of the camas prairie
into the central panhandle mountains, where a winter weather
advisory of snow will be in effect for Sunday into Sunday evening.

A rain and snow mix will extend as far north as the columbia
basin, the palouse and into the spokane and coeur d'alene on
Sunday with a cold rain mixed with light slushy snow. The surface
low is forecast to track across north central idaho into western
montana by Sunday evening, dragging deformation eastward. Snow
levels and cooler air will filter in from the north Sunday night
followed by partial clearing. Winds don't look strong enough to
scour out the boundary moisture, leaving residual low clouds and
patchy fog behind across extreme eastern washington into north
idaho. Rfox.

Monday... The Sunday system departs east-southeast of the region
during this period with a dry respite expected over the inland
northwest. Despite the drying... Low clouds and widespread fog are
expected to remain entrenched over most of the valleys due to
shallow inversions and limited mixing potential in the boundary
layer.

Tuesday and Wednesday... The next weather system will begin to
impact the area during this period. This will come in two rounds
with the first arriving Tuesday morning with light warm frontal
precipitation developing over the NE corner of washington into
the northern id panhandle. This precipitation will gradually
expand southward during the afternoon and evening as the
isentropic ascent and moisture availability increase through the
period. The ec and canadian models suggest the precipitation from
this will be very light... With totals generally less than 0.10
inches. Meanwhile the GFS shows totals nearly double that. Hard to
figure which solution to go with, however the atmosphere ahead of
this feature will be fairly dry, so we are leaning toward the
drier solution. Just about all of the precipitation which falls
from this will be snow.

The second round of precipitation will arrive late Tuesday night
and Wednesday as a trailing upper level trough and cold front
eventually push through the area. This second round of
precipitation will likely be more significant as it will have the
benefit of much stronger ascent and more moisture to lift. This
second round will also be warmer and we should see a transition
from snow to rain... Its just a question of how far north it will
go. The GFS suggests the precipitation will transition to rain
south of a line from chelan to spokane to kellogg by daybreak and
then slowly work its way north from oroville to colville to
bonners ferry by afternoon. Meanwhile the ec is quite a bit
colder and suggests locations north of spokane might not change
over at all. If that occurs, we'd be looking at the potential of
moderate valley snow across the northern third of eastern
washington and across much of the idaho panhandle with marginal
amounts over the northern columbia basin into spokane... But
confidence is low for specific totals at this time based on the
temperatures in the valleys. Meanwhile, moderate snow chances
look quite good for most of the mountains especially those over
the central panhandle as post-frontal showers continue into the
afternoon.

Wednesday night through Saturday... Chances looks quite good that
we will be dealing with a very strong ridge building into the
pacific northwest and remaining here for quite some time. This
will likely result in widespread low clouds and fog in the valleys
and a mostly clear skies over the mountains. Temperatures could be
tricky as cloud covered valley locations will see very small
diurnal temperature changes... While cloud free areas could see
very chilly nighttime temperatures followed by subtle warming.

Hard to predict where exactly the clouds will form, but feel
confident they will gradually expand through this period. Fx

Aviation
00z tafs: the next storm system moves in from the southwest
tonight with widespread top down moistening expected at all taf
sites. This will bring will rain or a rain snow mix with ifr MVFR
condtions at the TAF sites. There is a decent chance that rain
switches over to snow at kpuw and briefly klws but confidence is
low on exact timing. If this occurs earlier than expected, slushy
accumulations are possible at kpuw. Prior to widespread pcpn
event... The focus will be on the potential for low clouds and fog
development. The presence of broken to overcast mid clouds should
limit fog potential but areas of low clouds will remain a concern
with a very moist boundary layer. Subtle shifts in the winds will
slosh the low clouds around the basin leading to low confidence at
most terminals prior to the pcpn. Fog was introduced to kgeg due
to upsloping east winds witch tend to bring low clouds from kcoe-
ksff up the higher terrain into this terminal. Sb

Preliminary point temps pops
Spokane 32 36 25 33 25 35 0 90 20 0 0 40
coeur d'alene 33 37 26 34 24 34 0 90 50 10 0 60
pullman 35 38 29 33 24 35 40 90 70 10 0 40
lewiston 39 42 32 41 28 42 50 90 70 10 0 30
colville 29 40 22 38 21 37 0 10 10 0 10 50
sandpoint 32 36 26 34 24 34 0 60 20 10 10 70
kellogg 34 37 28 33 24 34 20 90 70 20 0 70
moses lake 35 40 27 40 27 39 0 60 10 0 0 20
wenatchee 33 39 27 37 26 37 0 30 10 0 10 30
omak 31 39 24 36 23 35 0 10 0 0 10 30

Otx watches warnings advisories
Id... Winter weather advisory from 4 am to 10 pm pst Sunday above 3000
feet for central panhandle mountains.

Winter weather advisory from 4 am to 7 pm pst Sunday above 4000
feet 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
Spokane, Felts Field, WA7 mi60 minW 410.00 miMostly Cloudy41°F37°F86%1021.5 hPa
Spokane, Spokane International Airport, WA18 mi60 minSSW 410.00 miOvercast38°F35°F89%1021.3 hPa
Coeur d'Alene Airport - Pappy Boyington Field, ID22 mi57 minSSW 410.00 miOvercast38°F36°F93%1023.8 hPa
Fairchild Air Force Base, WA24 mi1.9 hrsSW 510.00 miOvercast37°F36°F100%1021.8 hPa

Wind History from SFF (wind in knots)
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Last 24hrNE3E3CalmCalmCalmCalmCalmCalmE3CalmCalmCalmE4CalmCalmW4SW7SW10
G17
SW11
G21
W7W10SW11W4W4
1 day agoCalmCalmE3NE3CalmSW5SW4W3SW5SW4SW6SW5SW8SW7S3SW3S4S4S8S6S5CalmNE3NE4
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE7E3E5E3E3CalmSE4NE4CalmE4E4E4CalmCalm

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 (21,6,7,8)
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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.