Friday, March22, 2019

Marine Weather and Tides
Athol, ID

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 6:44AMSunset 7:03PM Friday March 22, 2019 4:56 AM PDT (11:56 UTC) Moonrise 9:21PMMoonset 8:00AM 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 Athol city, ID
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location: 47.98, -116.56     debug

Area Discussion for - Spokane, WA
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Fxus66 kotx 220932
area forecast discussion
national weather service spokane wa
232 am pdt Fri mar 22 2019

Friday will be a few degrees cooler as clouds increase ahead of a
weak cold front. The weekend will feature temperatures near
average with rain and mountain snow showers over the idaho
panhandle and portions of eastern washington. Typical cool and
showery weather is expected much of next week with high
temperatures mainly in the 50s.

Today through Saturday night...

starting with the big picture, an upper ridge of high pressure is
centered over the great plains and arches back toward the west
over central and western canada. Below this ridge is an upper
level low that is pinching off from a larger upper trof. The upper
low is currently situated over central utah. An area of
deformation extends north and northwest from that low which is
bringing the inland northwest increased upper level moisture. That
increased moisture will be the most notable difference in the
weather Friday as our sunny and dry streak comes to an end.

Mid and high level clouds will increase through the morning which
will help moderate temperatures. The big question is just how much
the high temperatures will decrease today and Saturday. The NAM is
an outlier but worth mentioning that it is aggressively bringing
in more low level moisture to the central basin and thus MAX temps
only reaching the mid to upper 40s today. This is 10+ degrees
different from our ongoing forecast and what the majority of the
models are suggesting for high temperatures today. As it is, we
are leaning heavily toward the more optimistic models that agree
on a mid to high cloud deck and daytime MAX temperatures 3-6
degrees cooler than Thursday.

Looking again at the satellite imagery, the other large feature is
a front off of the pacnw coast. It has been well advertised that this
front will fall apart as it moves inland Friday night. Surface
winds will increase from the southwest as the remnants of the
boundary move across the region while temperatures drop down
another notch Saturday.

The last feature in these first few days of note is the next upper
wave that will move across the region Saturday evening. The euro
and many of the ensemble members keep the inland northwest dry but
the recent deterministic models including the GFS and NAM are
indicating a band of rain is likely with this feature. I will be
tweaking the forecast slightly to add the possibility of light
rain Saturday night. Even if these deterministic models prove to
be correct, this should be a very low impact event with overnight
precip amounts less than a tenth of an inch. Ab
Sunday through Tuesday: low pressure residing off the wa coast will
send a series of shortwaves into the pac NW bringing several
rounds of showers and transition toward cooler, near normal
temperatures. Our first shortwave will be quite weak and pass
through the area Sunday. Overcast skies and scattered light
showers will plague much of idaho and eastern third of wa
throughout the day with clearing expected to reach the cascades
and eastern basin before sunset. Precipitation amounts will range
from a few hundredths to up to two tenths. The GFS has pockets of
higher amounts in the idaho panhandle but is an outlier and
generally not utilized. A few showers will linger over extreme
northeastern wa and N id Sunday night but by large, we should see
this first system exit north into canada with break in the
precipitation Sunday night and into midday Monday.

The second shortwave will arrive Monday evening and depart to the north
Tuesday afternoon. There are some subtle timing differences with
how fast the shield of precipitation spreads east of the cascades
but confidence is increasing that this will be a wetter system
compared to Sunday with this system featuring a more dynamic jet
streak and midlevel circulation. QPF between 0.10-0.20" will be
common across the region. Heavier amounts on the order of half
inch or more will be possible in the cascades and into the
northern mountain valleys of central wa including the okanogan
valley and republic area. This moisture will fall as snow for
elevations of 4500 feet and higher and may even have wet snow down
to 3000 feet under some of the more intense precipitation areas.

As such, expect snowy travel across sherman pass Monday
night Tuesday am and potential for wet slushy accumulations at
stevens loup loup passes. Any saturated fields experiencing some
degree of minor flooding could worsen. This is also the time of
year when precipitation events of this nature tend to create rock
slides in areas of steep terrain. These are nearly impossible to
predict where they will occur but as the ground continues to
undergo a freeze thaw cycle and then we add a few tenths of rain,
the threat will become elevated. A few showers linger over the
far northern mountains and along the wa or border Tuesday,
otherwise most of the inland NW will dry out.

Wednesday through Friday: the offshore low tracks inland Wednesday and
Thursday but looks to pass south of the area through oregon and
southern id. This is where the focus for light to moderate
precipitation will be which is good news as we continue to deal
with spring melt and runoff. The region will remain under the
influence of a cooler trough which will spark a few mountain
showers at times but any additional precipitation looks to be very
light at this time. By Friday... High pressure begins to
restrengthen over the ERN pac and gulf of ak placing the area
under northerly flow. Some models indicate another weather system
dropping in from the north renewing organized precipitation but
there is not a whole lot of of agreement... Thus confidence is low.

The air mass however looks to remain seasonably cool keeping
additional contributions of snow melt in check. Sb

06z tafs: high level clouds will move across the region from the
southeast tonight. The clouds will thicken overnight and towards
morning. Winds will remain light. Chance of rain comes into play
towards 06z Sat for lws and perhaps puw, but there is a lot of dry
air aloft to overcome. Wouldn't be surprised if sprinkles at best
and the rain comes aft 06z.

Preliminary point temps pops
Spokane 57 37 53 34 48 32 0 10 10 10 20 20
coeur d'alene 55 36 49 34 46 32 0 10 10 20 30 20
pullman 55 36 49 33 47 32 0 10 10 20 20 10
lewiston 59 43 53 39 51 34 0 30 20 20 20 10
colville 60 35 59 34 53 35 0 10 30 20 30 30
sandpoint 53 37 48 36 46 33 0 10 30 20 40 30
kellogg 56 37 49 36 45 32 0 10 20 20 50 20
moses lake 63 39 59 35 55 35 0 10 0 10 10 0
wenatchee 57 38 53 35 53 35 0 20 0 0 10 0
omak 61 40 54 37 50 36 0 30 10 10 20 10

Otx watches warnings advisories
Id... None.

Wa... None.

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Coeur d'Alene Airport - Pappy Boyington Field, ID20 mi60 minN 010.00 miFair33°F30°F89%1015.3 hPa
Sandpoint, Sandpoint Airport, ID22 mi61 minN 010.00 miFair28°F28°F100%1013.5 hPa

Wind History from COE (wind in knots)
Last 24hrSE7E6E9E6NE9NE7NE8NE8NE6NE7NE6W4CalmCalmW4S4SE7SE8S6S8SE9S8S6Calm

Tide / Current Tables for
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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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Spokane, WA (7,2,3,4)
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Ground Weather Radar Station Spokane, WA
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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 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 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.