Monday, March27, 2017

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 6:45AMSunset 7:26PM Monday March 27, 2017 3:43 AM PDT (10:43 UTC) Moonrise 5:54AMMoonset 6:09PM 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 270943
area forecast discussion
national weather service spokane wa
243 am pdt Mon mar 27 2017

Showers will linger over the region today behind an exiting cold
front. After a short break in the weather tonight another round of
widespread moderate precipitation will arrive Tuesday night and
last until Thursday. Friday will bring a dry break period before
more unsettled weather for next weekend.

Today and tonight... An upper level trough will move through the
region this morning. Satellite imagery shows the trough
shearing/splitting early this morning with the cold core and the
best energy looking more and more like it will drop into oregon.

Behind the cold front the atmosphere over the inland northwest is
still expected to destabilize. 500mb temps drop to around -29c,
lapse rates increase to right around 7c/km with afternoon heating
and lis drop 0 to -1. Expect the light stratiform precipitation
from early this morning to decrease through the morning hours with
showers developing through the afternoon and evening. Mu cape
increases to 200-400 j/kg around the middle of the afternoon,
throw in a shearing vort lobe and there is a small chance for a
few afternoon lightning strikes across the eastern basin, the
palouse and across the blue mountains. SREF guidance has backed
off on the probability of thunderstorms with the latest run, so
for now will keep any wording for lighting out of the forecast.

Weak high pressure will build in from the west overnight and
usher in a slightly drier air mass. Showers will still be
possible across the crest of the cascades and for the panhandle
mountains, otherwise conditions should be dry. Clearing skies and
light winds will result in fog and stratus development along the
rivers and for the northern valleys.

Tuesday and Tuesday night... The ridge of high pressure will
flatten on Tuesday ahead of a weak short wave expected on
Wednesday. This will allow another warm front to track through the
region Tuesday afternoon and Tuesday night. This frontal system
will again tap into deep and long fetch of pacific moisture. This
atmospheric river will increase moisture across the region to well
over 200 percent of normal. Isentropic up-glide along to 290-295
surface increases by late Tuesday afternoon and lingers over the
region through Tuesday night. The result will be another period of
light to moderate stratiform precipitation. Precipitation amounts
outside of the deep basin will be between a tenth and two tenths
of an inch. Snow levels will be 4000-5000 feet so the high
mountain snow will continue to pile up. Tobin
Wednesday through Thursday night: a warm front will spread into
the area Wednesday followed by a cold front Wednesday evening into
Thursday morning. There is a very good precipitable water tap
that looks to peak across the region late Wednesday morning. The
models are still in good agreement of pw values. The pw values for
wed aftn are a bit lower than yesterday, but think that is
because of the cold front getting ready to push across the
cascades and quickly lower values. Have kept our chance of
precipitation for Wed near 100%, but have lowered the amount of
precipitation we should expect. Central wa valleys could see
0.15-0.30 with eastern wa and north id valleys having a potential
of 0.30-0.50. The mountains could see half to one inch of liquid,
with the cascade crest expecting more. Snow levels will be fairly
high, about 5000 ft during the day with snow levels falling with
the passage of the cold front. Snow levels could get as low as
3500-4000 ft by Thursday morning, but the heaviest precip will
have ended across the region. So a valley rain and high mountain
snow event is expected. It will be possible for spokane to climb
to the 2nd wettest march spot on the climate records. Still do not
think spokane will make it to the number one spot. Thursday the
upper level trough moves through the region. Expect an increase in
showers, especially in the afternoon across eastern wa and north
id. Then Thursday night as the trough exits a ridge will start to
push inland. Our chance of precipitation will wane through the
evening and overnight hours.

*expect area rivers to respond to the moderate rain Wednesday.

Rivers, small streams and creeks will rise once again through
Friday. Ponding of water over roadways and fields is quite
possible as well. Cannot rule out the continued problems of
debris flows, rock slides and wash outs as the ground remains
saturated from all the rain.

Friday through Monday: an upper level ridge builds with dry
northerly flow moving into the region on Friday, for finally a dry
day. Then Friday night into Saturday the flow turns more westerly.

Models are differing pretty substantially on timing, strength and
track of a trough Saturday through Monday. Did not make many
changes to the forecast. Kept the best chance of showers across ne
wa, N id and the cascades. /nisbet

06z tafs: a slow passage of a low pressure system warm front
will allow for a prolonged interval of generally light
precipitation over the aviation area. MVFR ceilings and
visibilities associated with the precipitation (lowland and valley
rain with snow generally above 3500 feet msl) will linger at
times with improvement most likely after 17z Monday lasting into
the evening. /pelatti

Preliminary point temps/pops
Spokane 50 34 49 39 51 39 / 40 10 40 50 100 60
coeur d'alene 47 34 46 37 49 38 / 70 30 50 60 100 70
pullman 48 35 49 39 51 40 / 50 20 30 40 100 70
lewiston 54 37 54 42 56 42 / 40 10 20 20 80 70
colville 48 33 47 36 49 37 / 40 10 50 70 100 50
sandpoint 45 33 45 34 46 35 / 50 10 60 70 100 80
kellogg 44 33 44 35 46 36 / 90 40 50 50 100 80
moses lake 58 37 57 43 58 41 / 10 0 10 40 100 10
wenatchee 53 37 53 39 54 38 / 10 10 20 70 100 10
omak 52 34 51 39 52 37 / 20 10 20 70 100 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, WA35 mi50 minSSE 410.00 miOvercast41°F37°F89%1011.2 hPa

Wind History from OMK (wind in knots)
Last 24hrW5NW4NW3N3N4CalmCalmSE3SE4----CalmCalmCalmCalmS4SW3SW3CalmSE4S3SW3S3SE4
1 day agoCalmCalmCalmE3E3S4S6S7S12S12S13S17
2 days agoCalmCalmNW3NW3CalmCalmCalmCalmCalmCalmCalmCalmSE5S3S6SW6E4SE4SE4E3SE4SE5SE3S3

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 (6,6,7,8)
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Ground Weather Radar Station Spokane, WA
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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.