Saturday, March25, 2017 L-36.com


Marine Weather and Tides
Oroville, WA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:45AMSunset 7:22PM Saturday March 25, 2017 4:39 PM PDT (23:39 UTC) Moonrise 5:50AMMoonset 4:36PM Illumination 3% 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 Oroville, WA
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location: 49.16, -119.25     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 252144
afdotx
area forecast discussion
national weather service spokane wa
244 pm pdt Sat mar 25 2017

Synopsis
The threat of showers will taper off this evening as a weak ridge
begins to build over the region. The dry weather will come to an
end by late Sunday as another system moves into the pacific
northwest. This system will deliver widespread valley rain and
mountain snow, most of which will be fairly light. Showery weather
is then expected to persist into early next week. The next chance
of widespread precipitation will arrive on Wednesday and Thursday.

Discussion
Tonight... Upper level trough is making a steady progression
eastward through extreme eastern washington and north idaho this
afternoon. Good instability ahead of this feature has resulted in
scattered showers east of a line from republic to ritzville. The
instability is generally too shallow to support thunderstorms,
however the latest RUC analysis is showing MUCAPE values nearing
200 j/kg over the clearwater mountains and camas prairie where the
current dewpoints are in the upper 30s to lower 40s. The
corresponding model soundings show marginal instability depth so
the odds of thunder don't look good. The showers will rapidly
dwindle toward sunset as the shortwave trough moves east of the
id/mt border and we lose any solar heating. The remainder of the
night will be dry and relatively cool at least compared to last
night. Dewpoint readings are generally down 10-15f compared to
last night and the winds will decouple during the evening. The
main forecast problem will then pertain to the threat of fog.

Based on the low-level wind fields and lapse rates the best
chances for fog will occur over the protected northern valleys. Fx
´╗┐Sunday to Wednesday: the inland NW will remain in an active
pattern, with several opportunities for precipitation. First
Sunday morning patchy fog will be possible in some sheltered
valleys early, but otherwise it looks mostly dry. The main
exception to the dry forecast may be in the cascades as the first
system starts to approach. Then through Sunday afternoon and
evening precipitation is expected to increase from west to east as
a warm front lifts in and cold front pushes up to the cascades.

Then overnight into Monday morning precipitation decreases from
the west as the cold front pushes through. Monday an unstable but
stretching upper trough will continue to migrate across the
region. This will keep a threat of scattered showers alive across
the mountains and the eastern third of wa and id. I kept a slight
chance of thunderstorms in the forecast over the southeast cwa,
but confidence is lower than yesterday. Shortwave ridging and more
stable conditions develop Monday night into Tuesday morning,
shifting the main threat of precipitation into the mountains.

Finally Tuesday afternoon into Wednesday the next warm front lifts
in, tapping an increasingly deeper subtropical plume of moisture.

Precipitation chances will increase across the region Tuesday
afternoon and night, with the best chances near the cascades and
northern mountains. Chances become more likely through the day
Wednesday. /j. Cote'
Wednesday night through Saturday: a splitting upper-level trof
trickling inland will usher a slow moving cold front into the
region Wednesday night into Thursday morning. This will supply the
lift for one more burst of moderate showers before the rich plume
of subtropical moisture gets nudged to the south. There remains
some uncertainty related to the timing of the front with some
model solutions pushing the front through early Wed night and
others late Thursday morning but the general QPF output through
the course of the event remains similar with an additional quarter
to three quarters of an inch. Due to the splitting nature of the
trof, the most pronounced cooling aloft gets hung up over western
and central wa with 500mb temperatures cooling near -29c yet the
trof expand well into idaho allowing for upper-level to cool near
-23c. As such, the air mass will become increasingly unstable
promoting widely scattered hit or miss showers and a small chance
for a few t-storms.

A flat ridge of high pressure builds into the region Friday and
lingers into the weekend. Disturbances rippling through the ridge
will bring a small chance for mountain showers but at this
time... Look to be very light precipitation producers. Model spread
increases into the weekend with some guidance indicating more
amplification of the ridge going into a dry pattern while other
maintain a flat ridge and swift passage of shortwaves allowing for
a continued threat for mountain showers. It appears the region
will be void of heavy precipitation events allowing flooding
issues to recede. /sb

Aviation
18z tafs: main concern during this period will revolve around the
showers over the eastern third of the forecast area. Isolated
showers will occasionally impact geg sff and coe. These showers
will bring brief periods of MVFR CIGS interspersed withVFR cigs.

Hard to determine of the MVFR CIGS will persist more than half of
the time, but based on radar coverage and satellite imagery the
odds are against it. Puw stands the best chance of prolonged MVFR
cigs through most of the afternoon, while lws has a very small
chance. Conditions should improve at all these sites aft 02z as
conditions stabilize rapidly. For tonight there will be a small
chance of ifr stratus/fog, however with the low-level winds
turning to the se, we suspect that most of this will remain away
from the airports. Fx

Preliminary point temps/pops
Spokane 32 49 38 51 36 50 / 10 60 80 50 20 20
coeur d'alene 31 48 36 48 35 48 / 20 50 80 60 40 30
pullman 34 50 39 49 36 50 / 10 50 70 60 20 20
lewiston 36 54 41 55 38 56 / 10 30 70 50 20 10
colville 29 47 36 49 34 48 / 10 20 80 40 10 50
sandpoint 29 46 33 46 33 46 / 20 10 80 60 30 50
kellogg 31 46 34 44 34 45 / 20 30 70 90 50 40
moses lake 32 52 37 58 38 57 / 0 70 60 20 10 20
wenatchee 32 47 35 53 36 53 / 0 80 70 20 10 20
omak 30 47 35 53 36 52 / 0 70 80 20 10 20

Otx watches/warnings/advisories
Id... None.

Wa... None.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Omak, Omak Airport, WA50 mi47 minS 1510.00 miFair54°F28°F38%1015.1 hPa

Wind History from OMK (wind in knots)
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Last 24hrS3S6SW6E4SE4SE4E3SE4SE5SE3S3CalmCalmCalmE3E3S4S6S7S12S12S13S17
G21
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1 day agoS13S10S8S6SW4SW6S5NW3CalmSW9SW5CalmCalmNW3NW3CalmCalmCalmCalmCalmCalmCalmCalmSE5
2 days agoSW11SW5S4S5S7SW5SW7SW8S5SW3CalmCalmNW3NW6W3CalmCalmE4S6SE64S7SW11S8
G14

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
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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.