Tuesday, March28, 2017 L-36.com

Marine Weather and Tides
Lewiston, ID

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 6:30AMSunset 7:14PM Tuesday March 28, 2017 8:19 PM PDT (03:19 UTC) Moonrise 7:12AMMoonset 8:10PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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 Lewiston, ID
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location: 46.39, -116.98     debug

Area Discussion for - Spokane, WA
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Fxus66 kotx 282342
area forecast discussion
national weather service spokane wa
442 pm pdt Tue mar 28 2017

Rain and mountain snow will continue this evening. This comes
ahead of another round of widespread moderate precipitation that
will arrive overnight and last until early Thursday. This may
aggravate flooding issues. Friday will bring a dry break period
before more unsettled weather for next weekend.

´╗┐tonight thru Wednesday night... Our next system and strong
moisture fetch are evident on water vapor imagery as of late this
afternoon. A warm front lifting through the region will provide
mild overnight lows and good isentropic lift for an expanding
precipitation swath through the overnight hours. The previously
mentioned moisture fetch/atmospheric river will allow pwats to
rise to 0.6 to 0.9, or well into the 90th percentile. Rain will be
the predominant precipitation type from this system with snow
generally above 4-5k feet. By Wednesday night and into Thursday
morning, the best moisture fetch begins to sink to the south and a
cold front will sweep through the area. This will focus the best
chances for continuing precipitation over the central idaho
panhandle and far southeast washington.

Precipitation totals continue to look healthy and have been
trended upward some with this forecast package, especially across
the southeast zones (where naefs and GEFS climatological anomalies
are highest) and across the mountains of the idaho panhandle and
ne wa mountains. In general, look for 0.4 to 0.7 inches across the
eastern 1/3rd of washington, 0.6 to 0.9 across the panhandle
valleys and in excess of an inch of liquid in the mountains. The
deep basin and wenatchee area will probably see the lightest
totals as the isentropic lift looks weakest in this area. The
immediate cascade crest will likely see liquid amounts in the 1 to
2 inch range with some of that being tied up as snowfall in the
higher elevations.

Impacts: the additional rainfall will likely continue to aggravate
ongoing flooding issues. At this time, hydrographs for the main
stem river show some response, but don't deviate much from their
general ongoing trends. Smaller streams and rivers, such as the
little spokane river at dartford and paradise creek at moscow,
will likely react with rises and low-land and lake flooding will
continue to be an issue. The other area of concern will be the
continued risk of mud and landslides in steeper terrain,
especially across far eastern washington and the idaho panhandle.

For these reasons, a flood watch has been issued for portions of
northeast washington and all of our idaho panhandle counties.

Thursday to Friday night: the inland NW will remain in a
showery pattern, before a ridge of high pressure dries things out
for most of the region Friday, but there will be localized

First between Thursday morning and Thursday evening a stretching
upper trough will migrate across the western united states. This
will provide the inland NW will broad-scale lift and unstable
lapse rates and some pockets of weak afternoon/evening cape. At
the surface a boundary stretched across southeast wa and lower id
early Thursday will edge away. However a deformation axis wraps
back from a surface low sitting over the high plains and trails
across north idaho into central washington. All these factors will
mean a threat of showers, with the highest risk around the
mountains and southeastern wa/id and smaller chances back into the
columbia basin/northeastern wa. The risk will wane through the

As for thunderstorms, i'm not seeing any indication that instability
will be strong enough to warrant an inclusion. Overall precipitation
amounts will be highly variable, with some areas in a showery
set-up not seeing anything. The higher risk locations, especially
the southeastern CWA and mountains may stand a chance of seeing
some locally moderate precipitation amounts. Snow levels will be
around 3.5-4.5kft so this will mean the potential for some snow in
the mountain passes but impacts may be limited by the showery
nature. It will be locally breezy from the west to northwest,
especially toward the western and southern CWA but this too should
not be strong enough to have any significant impacts.

Then late Thursday evening and overnight, continuing into Friday,
deeper subsidence and more stable conditions start in. This will
shut off the threat of precipitation for most of the region. The
main threat of any linger showers will be over the idaho panhandle
mountains in the westerly flow. Friday night into Saturday
morning the flow starts to flatten with another system approaching
from the west. This will lead to some increasing middle to high
clouds from the west. A slight chance of precipitation will also
return to the cascade crest overnight. Patchy fog will be a threat
in the sheltered northeastern wa and id panhandle valleys
Thursday night/Friday morning and again Friday night. /j. Cote'
Saturday through Tuesday: the upper level jet stream and
associated dynamics will be primarily directed toward southern bc
on Saturday. A cold front will push across the region, but
without much support from aloft, it doesn't appear that this front
will bring much in the way of precipitation. The upper level
trough is then progged to dig in over the region Saturday night
into Sunday. The atmosphere is expected to be conditionally
unstable by this point with showers likely expanding in coverage
through the afternoon on Sunday. Temperatures will be a bit cooler
as well with our coldest night in the extended expected Sunday

Shortwave ridging will build in over the region for the beginning
of next week, which is expected to result in a drier period for
Monday into Tuesday. However, models are in decent agreement with
fair confidence for more precipitation to return to the region
around the middle portion of next week. Another upper level low
pressure system is set to develop in the gulf of alaska. This will
direct a better tap of pacific moisture into the inland
northwest. Snow levels will potentially rise above mountain tops
with rain at mid elevations and snow changing over to rain at
higher elevations as well. Although confidence is low for any
specific impacts, this will be another period to look to for
additional flood impacts/rock and mud slides across the region.


00z tafs: moist westerly flow will lead to rain for the TAF sites
tonight into Wednesday. Downslope flow off the cascades into
central washington as well as off the blue mountains into the
lewiston area should keep prevailing cigsVFR for these areas while
a moistening boundary layer over eastern washington and north
idaho will lead to lowering CIGS with MVFR conditions becoming
prevalent overnight into Wednesday. Jw

Preliminary point temps/pops
Spokane 40 51 39 52 35 55 / 80 100 70 40 10 0
coeur d'alene 38 49 38 50 34 53 / 80 100 80 50 10 0
pullman 41 51 41 49 34 52 / 60 100 90 60 20 0
lewiston 44 56 43 54 37 56 / 50 90 90 60 10 0
colville 40 48 37 52 34 55 / 90 100 60 40 0 0
sandpoint 37 47 35 49 33 52 / 90 100 90 50 10 0
kellogg 37 46 37 46 33 50 / 70 100 90 70 30 10
moses lake 44 58 40 59 34 60 / 80 80 30 20 0 0
wenatchee 42 54 38 55 34 58 / 80 80 20 10 0 0
omak 41 52 36 55 33 58 / 80 90 30 20 0 0

Otx watches/warnings/advisories
Id... Flood watch from late tonight through Friday morning for central
panhandle mountains-coeur d'alene area-idaho palouse-lewis
and southern nez perce counties-lewiston area-northern

Wa... Flood watch from late tonight through Friday morning for lower
garfield and asotin counties-northeast blue mountains-
northeast mountains-spokane area.

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lewiston, Lewiston-Nez Perce County Airport, ID2 mi23 minESE 810.00 miOvercast47°F42°F83%1025.2 hPa

Wind History from LWS (wind in knots)
Last 24hrS7S6SW7SW7CalmCalmCalmCalmCalmCalmCalmE4N4N5N4SE3CalmN3N5NW5NW8NW6CalmSE8
1 day agoCalmCalmSE53NE3W3CalmCalmE4CalmNE4S5NE4Calm5CalmCalmNW10W13W116
2 days agoS3CalmS3SE4SE5SE4SE4SE4CalmSE3SE5E4E9E3E6E7E4W7NW9E4SE5E5E5E5

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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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.