Tuesday, October17, 2017 L-36.com


Marine Weather and Tides
Spokane Valley, WA

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:11AMSunset 5:56PM Tuesday October 17, 2017 5:16 PM PDT (00:16 UTC) Moonrise 4:40AMMoonset 5:27PM Illumination 6% Phase: Waning Crescent; Moon at 27 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 180002
afdotx
area forecast discussion
national weather service spokane wa
502 pm pdt Tue oct 17 2017

Synopsis
Winds will subside quickly by sunset this evening. A moist frontal
system will bring a good chance of rain and mountain snow to
washington and north idaho on Wednesday. A wet and windy weather
pattern is expected to continue through the weekend. A return to
mild and drier conditions is expected early next week.

Discussion
Tonight: guidance suggests the upper level jet and the trop
fold area of darkening on water vapor just behind it pass through
eastern washington and north idaho quickly with the base of the
water vapor darkening east of the area in southern alberta southeast
british columbia around 5 pm pdt this evening so perhaps it is being
conservative to hold onto the advisory through 8 pm pdt.

Additionally any rainfall from the passing disturbance is expected
to be extremely light with the bulk concentrated up over the
northeast washington mountains and the northern mountains of the
north idaho panhandle. Regardless with the passage of this
disturbance there will be a small interval of clearing with the
decreased winds followed by more clouds invading the sky from the
west signaling the approach of yet another low pressure system. Left
some mention of late night patchy valley fog in place in northern
valleys. Pelatti
Wednesday through Friday night: very unsettled weather is
expected for the remainder of the work week. A warm front will
spread across the region on Wednesday. Stratiform precip will
start along the cascades in the morning and then spread east
through the afternoon. Rain will continue through the evening and
overnight hours, especially for NE wa and N id. This system has a
good moisture tap associated with it and most locations should see
light rain. The exception to this will be portions of the lc
valley and camas prairie where they could get nothing. Thursday
afternoon a cold front will push into the cascades, and into north
id by late evening. This front is quite a bit weaker than today's
front. By Friday the upper level trough is over the inland nw
with instability showers everywhere except the wenatchee area,
waterville plateau and portions of the western columbia basin.

Conditions look to start to dry out Friday night... But only for a
very brief amount of time.

Precipitation amounts: the bulk of the precipitation across the
cascades will fall Wed into early Thursday morning. Along the
crest they could see upwards of 2 to 4 inches of rain. As you come
off the crest towards leavenworth, plain, winthrop... They could
see 1-1.5 inches. Places like wenatchee and moses lake will see
the least amt of precip during this period... With 0.10 to 0.20
possible. Spokane, the palouse couer d'alene area will see about a
half to three quarters of an inch from wed-fri. NE wa and N id
which includes stevens, pend oreille, boundary and bonner counties
will see in the valleys 0.80 to over an inch... Locally up to an
inch and half in id around bonners ferry. The mountains around
there could see 1 to 3 inches of rain... With the higher amounts in
id. Last but not least SE wa into the lc valley and camas prairie
while will not get much if any precip on Wednesday, will see rain
on Thursday evening into Friday morning with the cold front
passage, and could see 0.25 to 0.50.

Winds: southwest winds will increase Wednesday afternoon and
remain elevated through Friday night. Gusts to 25 is likely for
most locations. Some locations could see gusts up to 35 mph.

Snow levels: snow levels will increase Wednesday and remain
fairly high (7-9k ft) through Thursday until the cold front
passes. Snow levels will then lower Thursday night and Friday down
to 4-5k ft. There could be some decent snow amounts in the
cascades along the canadian border Wed aftn as snow levels are
rising, but snow levels will be above 5k-5500 ft and is not
expected to impact any passes.

Temperatures: daytime temperatures will be slightly below average.

Lewiston will likely see at or above avg temps. Overnight lows
will be above average given the winds remaining elevated through
the nighttime hours. Nisbet
Saturday: a powerful westerly jet will bring rain, mountain snow,
and more windy weather to the pacific northwest this weekend.

There is good model agreement that a 250mb jet of 130-150kts will
be focused across washington and north idaho on Saturday. We are
looking for bands of moderate to locally heavy precipitation to
spread across washington Saturday into Saturday night along a
vigorous warm front. Early morning snow levels may be as low as
3000-4000 feet in the cascades and mountains of northeast
washington and north idaho. Heavy mountain accumulations will be
possible in the cascades on Saturday. Rapidly rising snow levels
Saturday afternoon and evening should limit snow accumulations in
the panhandle and northeast washington, but elevations above 5000
feet will have a decent shot of several inches by Saturday
evening. For the lowlands, Saturday's storm looks to be a wet one.

October storms similar to this one often produce over a half inch
of rain over the panhandle and the mountainous zones of northeast
washington. The exact track of the surface low will be a
determining factor in precipitation amounts with this fast moving
system. Storm track and timing will also dictate how much wind we
receive. At this time, it looks like 40 to 50 mph wind gusts will
be a possibility Saturday evening with mountain ridges potentially
gusting higher.

Sunday: by Sunday, the medium range models are forecasting the jet
axis to begin lifting north of the canadian border. The gfs
suggests a secondary shortwave passage on Sunday leading to
chances for showers. The ECMWF is drier, but maintains showers
over the cascades and idaho panhandle mountains.

Monday and Tuesday: at this time, it looks like Monday and Tuesday
will be relatively quiet as upper level high pressure returns to
the western us. Our forecast for early next week is calling for mild
afternoon temperatures and chilly nights. Gkoch

Aviation
00z tafs: winds will decrease abruptly between 01z-03z. We are
already seeing gusts dissipate at wenatchee and moses lake.

Pressure gradients will relax quickly as our next frontal system
races towards the washington coast. This approaching front will be
more of a precipitaiton producer than a wind producer. The gfs
and NAM are in decent agreement that light rain will develop east
of the cascades between 17z-19z. Wenatchee may be shadowed by the
cascades and lewiston may also be shadowed by the blue mountains.

Elsewhere, look for several hours of light rain on Wed afternoon.

Gkoch

Preliminary point temps pops
Spokane 41 54 48 53 42 50 0 80 80 90 60 50
coeur d'alene 39 55 46 56 41 49 0 70 80 90 80 50
pullman 43 59 49 58 43 50 10 40 30 60 80 40
lewiston 46 67 49 66 47 58 0 20 10 10 80 20
colville 35 53 44 54 41 52 0 90 70 80 70 40
sandpoint 34 52 43 52 38 48 0 100 100 100 100 70
kellogg 38 53 42 56 40 45 20 50 60 50 90 80
moses lake 37 60 47 60 38 57 0 60 50 50 30 10
wenatchee 39 58 45 59 41 55 0 40 20 50 40 10
omak 34 56 40 59 36 56 0 70 70 70 30 20

Otx watches warnings advisories
Id... Wind advisory until 8 pm pdt this evening for central panhandle
mountains-northern panhandle.

Wind advisory until 8 pm pdt this evening for coeur d'alene area-
idaho palouse.

Wa... Wind advisory until 8 pm pdt this evening for east slopes
northern cascades-northeast mountains-okanogan highlands-
okanogan valley-wenatchee area.

Wind advisory until 8 pm pdt this evening for lower garfield and
asotin counties-moses lake area-spokane area-upper columbia
basin-washington palouse-waterville plateau.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Spokane, Felts Field, WA7 mi24 minW 16 G 3810.00 miPartly Cloudy62°F27°F26%1012.3 hPa
Spokane, Spokane International Airport, WA18 mi24 minW 27 G 328.00 miOvercast and Windy58°F26°F29%1013 hPa
Coeur d'Alene Airport - Pappy Boyington Field, ID22 mi21 minWSW 21 G 358.00 miA Few Clouds and Breezy61°F35°F38%1012.9 hPa
Fairchild Air Force Base, WA24 mi79 minW 27 G 3710.00 miPartly Cloudy and Windy60°F32°F35%1011.4 hPa

Wind History from SFF (wind in knots)
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Last 24hrSW5CalmN3N4CalmNE4NE4NE4NE5NE5CalmCalmNE3NE4NE5NE3SW18
G23
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1 day agoCalmCalmNE3CalmNE4E4NE4NE3CalmCalmNE3CalmCalmNE4CalmSE4N3CalmCalm6SW7SW11SW9SW8
2 days agoSW6SW3CalmNE3N3NE3NE3CalmCalmCalmCalmCalmCalmNE33CalmCalmE43Calm3CalmN3S5

Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Spokane, WA (20,4,5,8)
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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.