Friday, March24, 2017 L-36.com


Marine Weather and Tides
Winthrop, 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 6:51AMSunset 7:22PM Friday March 24, 2017 7:05 AM PDT (14:05 UTC) Moonrise 4:19AMMoonset 2:32PM Illumination 10% 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 Winthrop, WA
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location: 48.47, -120.18     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 241143
afdotx
area forecast discussion
national weather service spokane wa
443 am pdt Fri mar 24 2017

Synopsis
More wet weather is on its way. The next storm system will bring
widespread rain and mountain snow today, followed by showery and
breezy weather for Saturday. Several inches of snow will be
possible on sherman, stevens, and loup loup passes. Sunday looks
dry. Unsettled weather returns Sunday night into Monday and
continues through next week, with several more rounds of rain and
mountain snow.

Discussion
Today through Saturday... Warm frontal precipitation associated with
the next in a series of weather systems is moving through the
region early this morning. The following cold front is progged to
be on the cascade crest between 12-15z then track across the
region through the day and be east of the forecast right around
00z this afternoon. The upper level trough will move over the
region tonight and remain over the region through Saturday, before
shifting to the east Saturday night. As such, we are looking at
24-36 hours of active and wet weather. Widespread moderate to
heavy stratiform precipitation is expected through early afternoon
followed by scattered to numerous showers later this afternoon
and this evening. There is some indication that the atmosphere
will destabilize enough with the frontal passage this afternoon to
support a low end chance for isolated thunderstorms in the basin,
but for now confidence in any lightning is low and will keep that
out of the forecast. Showers will linger over the higher terrain
overnight and may build back to the west as far as the palouse and
the west plains at times. The showers will expand across the area
on Saturday as day time heating will help to further destabilize
the atmosphere. These showers will likely contain brief heavy
rain, snow, graupel and gusty winds.

Precipitation amounts: precipitation with the warm front will be
fairly impressive. Moisture increases to around 250 percent of
normal. QPF amounts through this evening will range from around a
quarter of an inch in the basin to between a half and three
quarters of an inch outside of the basin. Precipitation will be
spotty on Saturday but the panhandle mountains could see another
tenth to two tenths, with less than a tenth elsewhere. High flows
on area rivers and streams, and ponding of water in fields and
near roads will likely be affected somewhat by this additional
precipitation.

Snow: snow levels will be under 2000 feet north of highway 2 and
between 3000-5000 feet south of highway 2. Snow totals across the
northern mountains and the cascades may reach 3-6 inches and
locally up to 8-9 inches for the highest elevation. For the
northern valleys cooler air has settled into the valleys and will
be slower to mix out and it will be possible to see 2-4 inches of
heavy wet snow through mid-day. As such a winter weather advisory
was issued for the valleys of zone 38 in eastern okanogan county
and western ferry county. For tonight and Saturday snow levels
will drop but accumulations will be more spotty as well.

Winds: pre-frontal winds will increase through the morning and
become gusty with and behind the cold front. Gusts 20-30 mph
through the basin will be likely. Winds will settle down overnight
but are expected to increase again on Saturday. Tobin
Saturday night through Sunday morning: models are in good
agreement of a shortwave ridge moving over the inland northwest.

There is a chance of precipitation mainly across north id in the
evening with dry conditions expected overnight and into the
morning hours.

Sunday afternoon through Tuesday: a trough will push onshore and
spread several disturbances through the region. The first will
arrive Sunday afternoon and evening. The threat of rain and
mountain snow will increase along the cascades and adjacent
valleys in the afternoon and then spread eastward during the
evening hours. Subsequent waves will move through the region as
the trough moves through the area, keeping the threat of showers
in the forecast... The main area being extreme eastern wa and north
id as well as the cascade crest. The models have come more in
line over the last 24 hours, and so forecast confidence is
growing.

Wednesday through Friday: GFS and ec are in good agreement of
another trough moving through Wednesday. Have increased the chance
of precipitation Tue night through wed. Showers will remain in
the fcst Thursday as the backedge of the trough moves through.

Then both GFS and ec show a ridge moving in for Friday. Have
decreased chance of precip for Friday.

Snow levels through the extended period remain fairly high with
valley rain/mountain snow expected. Temperatures will generally be
around average for this time of the year, but some locations like
wenatchee will see daytime temps 5-10 degrees below average.

/nisbet

Aviation
12z tafs: the next wet storm system is moving through the
forecast area at the time. Light precipitation has been reported
as far east as kmwh and should move through the easter TAF sites
between 12-14z. Precipitation will be light to moderate.

Cigs/vsby will drop to MVFR and for short periods ifr through
18-20z for keat/kmwh and through 02-04z for the eastern taf
sites. The front will clear the western portion of the basin by
mid day and be east of the forecast area between 00-03z.

Convective showers will be possible through 04-06z. Tobin

Preliminary point temps/pops
Spokane 45 36 50 32 50 38 / 100 60 30 0 0 80
coeur d'alene 44 36 48 33 49 36 / 100 90 70 10 0 80
pullman 47 37 49 34 51 39 / 100 60 50 0 0 80
lewiston 53 39 54 36 56 42 / 80 60 50 0 0 60
colville 46 35 50 31 49 35 / 100 60 50 10 0 60
sandpoint 42 33 45 30 46 32 / 100 90 60 20 0 50
kellogg 43 34 44 31 47 34 / 100 100 70 20 0 60
moses lake 53 37 59 33 54 40 / 100 20 10 0 10 70
wenatchee 49 35 53 32 47 36 / 100 20 10 0 30 80
omak 47 35 53 31 48 37 / 100 20 10 0 20 80

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

Wa... Winter weather advisory until noon pdt today for okanogan
highlands.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Omak, Omak Airport, WA35 mi12 minWNW 310.00 miLight Rain38°F35°F89%1013.2 hPa

Wind History from OMK (wind in knots)
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Last 24hrCalmCalmE4S6SE64S7SW11S8
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S13S10S8S6SW4SW6S5NW3CalmSW9SW5CalmCalmNW3NW3
1 day agoS3S7S6S6SW8S9SW10SW11SW12SW11SW5S4S5S7SW5SW7SW8S5SW3CalmCalmNW3NW6W3
2 days agoN6NE4N3CalmN5NE4N7N5NE4NW3SE7W7S4NW4SE5SE4S5S6S8S7S7SW10SW5SE4

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
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Wind Forecast for Spokane, WA (10,2,3,4)
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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.