Wednesday, May24, 2017

Marine Weather and Tides
Winthrop, WA

Version 3.4
What's New / NOTES
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 5:11AMSunset 8:45PM Wednesday May 24, 2017 8:17 PM PDT (03:17 UTC) Moonrise 3:53AMMoonset 6:23PM Illumination 0% Phase: New Moon; Moon at 29 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 242342
area forecast discussion
national weather service spokane wa
442 pm pdt Wed may 24 2017

Cooler than average temperatures are expected again on Thursday
with scattered showers and a few thunderstorms. Strong high
pressure will build over the region this weekend bringing dry
weather and warm temperatures for memorial day. Look for afternoon
temperatures in the 80s by Sunday and Monday. Our warm weekend
will likely cause rises on rivers in central and north central
washington next week.

Tonight: our gusty west winds will decrease quickly this evening
as or west to east surface pressure gradient relaxes. Through
about 7 pm, we will have the potential for gusts in the 35 to 40
mph range through the cascade gaps including areas around
wenatchee, chelan, waterville, and vantage. One of the shortwave
features contributing to the decrease in the pressure gradient is
a 500mb trough pivoting into northeast washington out of southern
b.C. Regional radar imagery at 2 pm shows weak reflectivity in the
vicinity of bonners ferry, priest lake, and kettle falls. Web
cameras show some weak rain shafts under the increasing cloud
deck, but so far we have seen no rain reported from any weather
stations. Pavement at laurier, priest lake, bonners ferry appears
to be dry. Strong low level dry advection behind last night's cold
front will make it difficult for any significant rain to make it
to the ground. Many areas have a surface dewpoint in the 20s this
afternoon... Quite dry. Needless to say, our precipitation chances
this evening and through the night is pretty slim as our 500mb
trough moves southward through our region.

Thursday: our chances for rain showers will increase on Thursday.

An upper level trough and deep cyclonic flow will create an
environment favorable for afternoon and early evening showers. Our
surface dewpoints will be on the rise as our dry downslope winds
are replaced by lighter winds originating from canada. The GFS and
nam forecast the best surface based instability over the mountains
of northeast and north central washington and the high terrain of
north idaho. Scattered showers will likely develop over these
areas and drift southward into the upper basin, spokane area, and
possibly the palouse. A few of the strongest cells will be capable
of brief heavy rain, small hail, and a handful of lightning

Friday: high pressure will begin building along the coast on
Friday. A few showers may pop up over the panhandle mountains
fri, but the rest of the northwest will begin a warming and drying
trend that will carry through the memorial day weekend. Gkoch
Saturday through Monday night... An upper ridge will build over the
region through the memorial day weekend bringing a warming trend
under clear to mostly clear skies for most locations. High
temperatures for Sunday and memorial day will warm into the 80s
with the warmest locations such as moses lake, wenatchee, and
lewiston reaching near 90. The GFS and ECMWF show the ridge axis
setting up over eastern washington with weak impulses riding up
along the back side of the ridge up the washington cascades, then
east along the canadian border, and then south along the front
side of the ridge into western montana. This combined with steep
lapse rates and CAPE values of 500-800 j kg could touch off a few
isolated storms over the mountains. However with the warm
temperatures aloft and some convective inhibition in
place... Confidence is low of storms firing with the better chances
expected north of the canadian border and east of the area in

The warm temperatures will result in another round of snow melt
with river rises next week. Current forecast has the okanogan and
stehekin rivers at the highest risk for flooding... And the methow
rising back up to near flood stage. Will also have to keep a close
eye on the kettle, entiat... And similkameen rivers. Jw
Tuesday and Wednesday: no major changes to the weather pattern to
start Tuesday, but beginning late Tuesday model solutions diverge
in how the persistent upper ridge will break down, if at all. The
canadian is the most bullish bringing in a deep trough late
Tuesday into Wednesday, while the GFS shows a much weaker wave.

The ec, though, wants to hang onto the ridge through mid week. The
ec has been moving toward this continued ridge pattern over the
past few days while others are pretty noisy run-to-run. Without
something to increase confidence, will keep us in the warm dry
pattern. Under the more moist SW flow a few mountain showers or
thunderstorms will be possible. Temperatures remain above normal
through the period, in the 80s and low 90s. Bw

00z tafs: gusty west or northwest winds will persist through
02-04z time frame for the airports across the region. Localized
gusts to 40 mph will be possible at the wenatchee and chelan
airports courtesy of cascade gap wind effects. Further east,
spokane, coeur d'alene, pullman, and lewiston can expect gusts in
the 25-30 mph range through about 02z. Radar is showing some
showers moving down in the northerly flow. With very dry
conditions at the surface, think virga or some very light
sprinkles at best is possible for the kgeg-ksff-kcoe this evening.

Clouds will persist through the night with widely scattered
showers possible thur aftn... Mainly across the northern mountains
of wa and id. Skies will start to clear late in the afternoon.

Preliminary point temps pops
Spokane 44 66 47 74 51 78 10 20 10 10 0 0
coeur d'alene 44 65 44 73 47 77 10 30 20 10 10 0
pullman 44 64 44 70 48 75 10 20 10 10 0 0
lewiston 49 69 49 77 53 82 10 20 10 10 10 0
colville 45 68 44 77 48 80 10 30 20 0 0 0
sandpoint 39 64 41 70 44 75 20 30 30 10 10 0
kellogg 41 63 40 71 43 75 20 30 20 20 10 0
moses lake 48 74 47 83 52 85 0 10 10 0 0 0
wenatchee 48 73 50 82 55 84 10 20 10 0 0 0
omak 48 74 50 81 53 84 0 30 20 0 0 0

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, WA35 mi24 minN 1210.00 miOvercast59°F36°F42%1008.7 hPa

Wind History from OMK (wind in knots)
Last 24hrW24
1 day agoSW4W4SW3W5W4S3W3CalmW4W3Calm3SE35S6S10S8S12S10S14S14
2 days agoS4W5NW7W6NW5NW4N3NW43N5CalmN7NE6NE5N7N6CalmSW45S5SW6SW6S5SE5

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
IR Satellite Image from GEOS

GOES Local Image of PacificNorthwest    EDIT

Wind Forecast for Spokane, WA (23,6,7,8)
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Ground Weather Radar Station Spokane, WA
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weather_mapweather_map weather_map

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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.