Saturday, December16, 2017 L-36.com


Marine Weather and Tides
Metaline Falls, 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 8:32AMSunset 4:46PM Saturday December 16, 2017 5:21 PM MST (00:21 UTC) Moonrise 6:52AMMoonset 4:19PM Illumination 2% Phase: Waning Crescent; Moon at 28 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 Metaline Falls, WA
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location: 49.49, -117.29     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 162331
afdotx
area forecast discussion
national weather service spokane wa
331 pm pst Sat dec 16 2017

Synopsis
Light snow returns on Sunday with the potential for moderate
accumulations on area mountain passes. A warmer and windier
weather system impacts the region Tuesday into Wednesday bringing
the potential for heavy mountain snows and mix of rain and snow in
the lower elevations. The weather will then be dry and cold for
the remainder of the week.

Discussion
Tonight through Sunday night: satellite derived precipitable water
indicates an axis of subtropical moisture streaming toward the
pacific northwest from west of the hawaiian islands. This
moisture will overtop a shortwave ridge building into the region
this evening and bring an extended period of cloudiness and light
precipitation. The arrival of the subtropical air mass will warm
our resident air mass resulting in rising snow levels and brief
threat for mixed wintry precipitation. The orientation of the
moisture transport from the west northwest implies that
precipitation amounts will be very light in the cascade rain
shadow and moderate to heavy over an extended period of time along
the immediate cascade crest and the idaho panhandle.

Precipitation rates will be light through much of the day Sunday
but look to increase Sunday night into Monday morning as lift
becomes enhanced along a warm front. Snowfall amounts will range
from 2 to 4 inches in the valleys of north idaho to 1-2 inches for
adjacent counties in eastern washington. The exception will be
along the pend oreille river valley which could amounts similar to
north idaho. Snow levels will start off on valley floors but will
begin to rise toward 3000 feet Sunday night into Monday morning.

Locations that do pickup 3 or 4 inches before the switch may be
dealing with a slushy mess during the Monday morning commute.

As for freezing rain or sleet, it is tough to pinpoint any particular
area at this time with probabilities for a 0.01" of freezing rain
found briefly at nearly all spots south of highway 2. SREF wpc
probabilities have shifted some into the lower id panhandle and
cascade valleys south of lake chelan while some of the hi-res and
deterministic guidance spreads the threat into portions of the
columbia basin. All things considered, the mention of sleet and
freezing rain remains in the forecast for some points but we are
not expected much in the way of impacts from ice at this time. Sb
Monday through Wednesday... The first part of the extended forecast
period will continue with an active weather pattern. After mid
week conditions will calm down significantly. The flow across the
region will remain zonal Monday and Monday evening with the warm
front sagging to the south. Precipitation will linger in the
normal orographically enhanced area... The lee side of the cascade
crest and the idaho panhandle. Precipitation will be as snow down
to the valley floors north of about highway 2 and valley rain and
mountain snow to the south of highway 2. Additional light
accumulations will be possible Monday afternoon.

This is about as much of a break as we get as the next storm system
will quickly drop out of the gulf of alaska and begin to affect
the region Monday night. Model guidance has come in a bit stronger
with the isentropic lift especially across the northern
mountains, but also much wetter. The cold front will cross the
cascades Tuesday evening and be east of the forecast area by 12z
Wednesday morning resulting in drying from the west and
precipitation in the mountains becoming showery. Precipitation
amounts through Wednesday morning have been increased
substantially across mainly the higher elevations, but because
this is the first run with the higher moisture QPF was kept to the
low end of guidance, at least for now. Snow levels will be on the
increase from south to north through Wednesday afternoon
increasing to 4500-5000 feet across the south by Tuesday morning,
but remaining 3000-3500 feet across the north.

*impacts: there is the potential for moderate to heavy
precipitation across the northern zones and snow levels hovering
around 3000 feet will result in a 24-36 hour period of heavy
snow across the majority of the mountain zones. Storm total snow
for the cascades and the north panhandle mountains could see 1-2
feet, across the okanogan highlands 4-8 inches, for the northeast
washington mountains and the central panhandle mountains 8-16
inches. It is certain that these numbers will change as we get
closer to the event but forecast confidence is moderate at this
time. Winter highlights will likely be needed for the mountains,
but these will be held off until the next system tonight and
Sunday is over to avoid confusion. For the valleys and lowlands
surrounding the basin precipitation amounts up to a half inch
will be possible.

Wednesday night through Saturday... A ridge of high pressure will
amplify off the coast and will put the region in a cool but dry
northerly flow. There are some subtle differences on just where
the ridge axis sets up. Some of the extended guidance wants to
push the ridge a little further west thus allowing a weak wave to
drop south along western montana on Friday for isolated snow
showers. For now the forecast was kept dry. Otherwise temperatures
will be on the cool side of normal with the potential of localized
stratus and fog for the northern valleys. Tobin

Aviation
00z tafs: all terminals experiencing stratus this evening. Expect
cigs to lower after sunset however boundary layer winds do start
to increase from the south overnight ahead of the next storm
system. This could lead to some clearing from south to north for
locations like klws, kpuw, kmwh, keat. Timing carries low
confidence. Otherwise, moisture spilling into the region will lead
to a top down moistening and -sn or brief shower at the terminals
10-14z. Very little precipitation expected for kmwh keat so went
with vcsh but these areas may see brief mix of sleet freezing rain
with only trace amounts. Winds continue to increase from the south
on Sunday so despite the potential for -sn, thinking CIGS will
improve for several terminals. Sb

Preliminary point temps pops
Spokane 26 35 33 38 33 41 30 60 40 20 60 90
coeur d'alene 25 33 33 39 33 40 20 70 70 40 80 100
pullman 25 34 34 40 36 41 10 40 60 60 60 70
lewiston 28 37 37 46 37 46 10 30 50 30 40 40
colville 28 33 30 36 31 36 40 70 50 10 60 100
sandpoint 28 33 32 38 31 38 30 80 90 50 80 100
kellogg 23 31 31 36 32 37 10 70 90 80 90 100
moses lake 30 35 31 40 33 44 20 30 10 10 30 40
wenatchee 30 33 30 41 32 39 20 30 10 20 40 40
omak 29 33 29 35 31 37 40 50 10 10 50 60

Otx watches warnings advisories
Id... Winter weather advisory from 10 am Sunday to 10 am pst Monday
for central panhandle mountains-northern panhandle.

Wa... None.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boundary County Airport, ID75 mi52 minSW 510.00 miOvercast30°F23°F75%1021.7 hPa

Wind History from 65S (wind in knots)
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Last 24hrSW4W3CalmCalmCalmSW4SW4CalmCalmCalmS5CalmS4CalmCalmS4CalmS4CalmS3SW4S6SW4SW5
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS4SW3CalmSW8SW9SW5
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

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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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

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.