Saturday, March24, 2018

Marine Weather and Tides
Spokane Valley, WA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:41AMSunset 7:08PM Friday March 23, 2018 9:32 PM PDT (04:32 UTC) Moonrise 10:38AMMoonset 1:09AM Illumination 49% Phase: First Quarter Moon; Moon at 7 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 232318
area forecast discussion
national weather service spokane wa
418 pm pdt Fri mar 23 2018

The weather will be cold and unsettled for the weekend. Snow is
likely tonight and Saturday morning for most locations of the
inland northwest. Temperatures will gradually warm back into the
50s with drier conditions next week but it will be rather breezy
at times.

´╗┐tonight through Saturday night: a risk for showers will
continue across the region this evening, but a more robust and
broader threat develops overnight into Saturday morning in the
form of snow for many. A broad low sits off the pacific northwest
coast this hour and the shortwaves embedded in the flow around it
will be the main players. One shortwave is lifting through the
cascades this hour. This will continue to produce some snow
around this region through afternoon to early evening, before a
relative lull develops as that shortwave exits. Instability
showers will continue across the eastern third of wa and id too,
with the steadier of these expected to stretch from southeast wa
to the central panhandle where a boundary lingers. This will
include a mix of rain and snow. There is the off chance there
could be some isolated embedded thunderstorms around the northern
mountains before sunset, but the risk is too limited to include in
the official forecast. That round of precipitation will shift
northeast through the night.

Yet at the same time a second robust shortwave will pivot around
the parent low, with an accompanying surface low and deformation
axis. This lifts across the columbia basin overnight into early
Saturday morning, which will bring the broader threat of snow from
the cascades to idaho, though it is more apt to be mixed with snow
over the deeper columbia basin into the l-c valley. The lowest
overall threat will be in the deeper columbia basin moses lake
zone. Looking at regional guidance on road temperature trends
through this period suggests that for many spots the snow should
mainly accumulate on grassy surface, though that still could be a
inch or two. Yet there will be a better threat of accumulating on
road surfaces according to that road temperature guidance across
the northern mountain zones, including the okanogan highlands to
northern idaho panhandle. With this in mind and the potential for
more than two inches of snow (maybe 2-5) we elected to issue a
snow advisory for these areas. It should be noted that some of the
more urban areas, such as around sandpoint, may also see snow
just accumulating on grassy surfaces. So the snow may not be as
impactful in all locations. Other areas to monitor, however, will
be around the okanogan valley, northern upper columbia basin, the
spokane c'da area into the central panhandle. A heavier more
intense snow rate could overcome the propensity for snow to just
melt on road surfaces in these areas. So this will be monitored
and but for snow these locales are being left out of the advisory.

Going into Saturday afternoon the shortwave deformation axis
lifts northward, drawing the broader threat of precipitation
toward the northern mountains. However there will still be a good
threat of showers across the north and eastern columbia basin
through central panhandle. Newest guidance was a little wetter in
this respect. I increased pops and QPF amounts a bit. This will
again fall in the form of snow or a rain snow mix. However with
the afternoon heating Sun the potential for accumulating
effectively will be lessened further. Saturday evening into
Saturday night the overall risk will wind down and exit through
the northeastern cwa. J. Cote'
Sunday through Friday: the cold upper trough exits the region
early next week for a drying and warming trend. High pressure
builds just off the wa or coast, which puts us in a northwesterly
flow pattern. This pattern is known for 2 things: wind and
mountain precipitation. For the wind side of things, Tuesday,
Wednesday and Friday look to be the windiest days, especially in
the mountains. For precipitation, there are a couple of weak waves
in this northwest flow that will bring mountain snow to the
cascades and panhandle mountains. The computer models have been
varying on the timing of these waves. At this point none of the
waves look particularly wet. The most favored area for snow will
be the idaho panhandle south of i-90. Rj

00z tafs: large area of low pressure with smaller disturbances
nested inside it and moving around will continue to influence the
aviation area. The cold conditionally unstable nature of a big
portion of it will allow for a spring mix of precipitation in the
form of snow, rain, and small graupel to fall at times and produce
vfr MVFR conditions with ifr conditions at times associated with
the more intense snowfall. Low level wind shear is a possibility
tonight as winds decouple and should end tomorrow morning as
winds increase and become more gusty and prevail from the
southwest. Pelatti

Preliminary point temps pops
Spokane 33 41 25 44 27 46 50 80 20 10 10 10
coeur d'alene 33 40 23 43 24 43 60 90 20 20 20 20
pullman 33 41 26 43 29 44 70 70 10 30 20 10
lewiston 38 50 32 50 34 53 50 60 10 20 20 10
colville 32 43 24 47 25 49 60 90 20 20 10 10
sandpoint 30 38 23 42 25 42 60 90 40 20 20 20
kellogg 31 37 24 39 25 39 70 90 20 40 20 20
moses lake 34 51 26 53 28 55 50 40 0 0 0 10
wenatchee 33 47 27 50 31 52 50 40 10 10 10 10
omak 30 42 23 48 27 51 60 70 10 10 10 10

Otx watches warnings advisories
Id... Winter weather advisory from 11 pm this evening to 5 pm pdt
Saturday for northern panhandle.

Wa... Winter weather advisory from 11 pm this evening to 5 pm pdt
Saturday for northeast mountains-okanogan highlands.

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Spokane, Felts Field, WA7 mi39 minE 710.00 miLight Rain38°F33°F83%1011.9 hPa
Spokane, Spokane International Airport, WA18 mi39 minSSE 410.00 miLight Rain Snow34°F33°F97%1011.6 hPa
Coeur d'Alene Airport - Pappy Boyington Field, ID22 mi36 minN 04.00 miLight Snow Fog/Mist33°F30°F92%1015 hPa
Fairchild Air Force Base, WA24 mi94 minSSE 1010.00 miMostly Cloudy36°F30°F79%1011.6 hPa

Wind History from SFF (wind in knots)
Last 24hrS7CalmSW6CalmCalmSW6NE3NE4NE3NE4NE6E5E8E7S10
1 day agoE7SE8E8E12E8E14
2 days agoNE4NE5E3NE3NE4NE3CalmCalmCalmCalmCalmCalmCalm3E7SE8NE5SE10

Tide / Current Tables for
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Weather Map and Satellite Images
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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 (0,6,7,8)
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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.