Thursday, March30, 2017 L-36.com


Marine Weather and Tides
Athol, 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 6:25AMSunset 7:17PM Thursday March 30, 2017 1:29 PM PDT (20:29 UTC) Moonrise 8:16AMMoonset 10:41PM Illumination 12% Phase: Waxing Crescent; Moon at 3 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 Athol city, ID
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location: 47.98, -116.56     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 301751
afdotx
area forecast discussion
national weather service spokane wa
1051 am pdt Thu mar 30 2017

Synopsis
Today will be breezy over much of central washington while the
idaho panhandle and portions of eastern washington will experience
scattered afternoon showers. The weather on Friday will be mild
and dry with light winds. The weekend and early next week will
feature average temperatures and scattered light showers, mainly
over the mountains.

Discussion
Today and tonight: the weather today will be breezy across central
and north central washington as a surface low organizes over
southern idaho and northeast nevada. The northwest pressure
gradient will favor gusty winds through the okanogan valley,
waterville plateau, moses lake area, and upper columbia basin. By
early afternoon, look for sustained winds around 15 mph with gusts
of 20 to 25 mph in these areas. The idaho panhandle and eastern
third of washington can expect scattered showers today as an
elongated upper level trough creeps over the region. Afternoon
destabilization will contribute to small cells capable of brief
heavy rain, graupel, and maybe some small hail. A few lightning
strikes may accompany some of the strongest cells, but the
atmospheric profile may be a bit too cool for more than a strike
or two. A flood watch remains in effect for much of the idaho
panhandle and portions of northeast washington following
yesterday's rainfall. Field and small stream flooding continues to
be an issue after weeks of above average precipitation. The day
shift will call various county agencies this morning to check the
status of flooding. Today's showers won't be widespread enough to
worsen flooding, so we may be able to drop some or all of the
counties from the flood watch later this morning.

Previous forecast discussions mentioned the possibility of a wrap
around band of rain/snow this morning for the blue mountains and
camas prairie. The models have trended further south with this
deformation band. Trends on satellite and radar support the
southerly track advertised by the latest model runs. If there is
any accumulation this morning, it appears as if it will be an inch
or less on grassy surfaces above 4000 feet around anatone and
winchester. /gkoch
Friday: a dry day? A day with light winds and a good deal of
sunshine? Afternoon temperatures in the 50s? Will we be able to
handle a truly nice early spring day? If we had a "nice day
advisory", we'd need to issue one for Friday so people could
prepare for such a rare occurrence in the spring of 2017. Mid-
level high pressure will build over the region bringing a rare day
of no precipitation across eastern washington and north idaho.

Areas of valley fog in northeast washington and north idaho should
dissipate by mid to late morning giving way to partly cloudy
skies. Bands of high clouds will be on the increase in the
afternoon as the next frontal system moves into british columbia.

Saturday through Monday night: a swift westerly aloft
will take over the inland NW for Saturday guided by a 120kt+ jet
aloft. With a low in the gulf of alaska, an elongated cold front
will push through the region. The GFS seems to be the juiciest
with pwats of near a half an inch with the front, while the ecmwf
and canadian trend toward drier solutions. Yes, there will be
moisture, although not quite the caliber of wed's system. In
addition, the westerly flow will enhance downsloping in the lee of
the cascades into the basin with mostly dry and breezy
conditions. This should also be the mildest day of the week. The
models are trending to a solution that brings showers across the
northern mountains Saturday morning, then pushing across extreme
eastern washington into idaho panhandle for the afternoon and
evening hours. This convection may spark an isolated thunderstorm
but guidance shows low confidence with this. The front looks to be
a fast mover with showers decreasing Saturday night with drier
air moving into the region. Sunday should start off on the dry
side with shortwave ridging, although a weak trough aloft will
approach from the west. Low level moisture in sheltered valleys
and clearing aloft will increase the fog potential especially in
northeast washington and north idaho. This upper trough shows
signs of stretching and splitting, directing the main energy south
of the region into oregon and leaving colder air aloft and
instability over the inland northwest. Anticipate orographic
showers to increase during the afternoon and evening hours under
the westerly flow, daytime heating and the passage of the upper
trough axis. Mid level moisture does increase with trough axis
passage with scattered mountain showers and snow levels 3k to 4k
ft. By Sunday night into Monday, the trough axis slowly exits
north idaho as an upper low spins up and tracks into montana and
wyoming. Instability and orographic showers will return to extreme
eastern washington and north idaho especially by the afternoon
and evening hours. Anticipate temperatures to trend slightly
cooler for Sunday into Monday, and remaining below normal for the
start of april. /rfox.

Tuesday through Thursday: Tuesday a shortwave builds in over the
region bringing us a mostly dry Tuesday and even into the first
half of Wednesday. The only exception could be a few hit and miss
mountain showers. Enjoy the dry weather because late Wednesday
into Thursday another moist frontal system is ushered in,
bringing more rain. Southwest winds will tap into a good pacific
moisture feed, with pwats from 0.75 to 0.90. These winds will also
advect in some warmer air with temps steadily climbing each day.

Widespread highs in the upper 50s won't be out of the question by
Thursday. /bwilliams

Aviation
18z tafs: widely scattered showers over eastern wa and the id
panhandle will continue through the aftn hours. Airports with a
decent shot of showers this afternoon are colville, sandpoint,
bonners ferry, coeur d'alene and pullman. The strongest cells
will have the potential to produce brief heavy rain and soft hail
(up to pea size) in the 20z-01z time frame. Showers should
diminish quickly this evening with the loss of afternoon heating
and dry north advection through the evening. There is the
potential of some low clouds or fog early Fri morning, but
confidence isn't high. Put in a sct low cloud deck for geg-sff-
coe-lws, and bkn for puw where confidence is a bit higher.

Preliminary point temps/pops
Spokane 52 34 54 37 56 36 / 30 20 0 0 20 10
coeur d'alene 50 33 54 36 54 34 / 40 20 0 0 20 20
pullman 50 32 51 35 55 35 / 50 30 0 0 20 20
lewiston 56 36 56 37 59 38 / 50 20 0 0 10 20
colville 52 32 55 34 54 34 / 20 20 0 0 20 10
sandpoint 48 32 53 33 51 32 / 30 20 0 0 30 20
kellogg 46 33 50 33 50 33 / 50 40 0 0 20 20
moses lake 61 35 60 39 62 37 / 10 10 0 0 10 10
wenatchee 57 36 57 39 59 37 / 10 0 0 0 20 10
omak 56 32 57 36 58 33 / 10 10 0 10 20 10

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

Wa... None.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Coeur d'Alene Airport - Pappy Boyington Field, ID20 mi33 minWNW 810.00 miPartly Cloudy47°F37°F69%1016.7 hPa
Sandpoint, Sandpoint Airport, ID22 mi34 minSW 710.00 miMostly Cloudy48°F37°F66%1013.5 hPa

Wind History from COE (wind in knots)
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Last 24hrS9S7S9S6S7CalmE4SW10SW9SW13SW19Calm3S54S7SW5S5W4SW4SW7SW9SW8W8
1 day agoS12S8S9S8S8S8SE8S7S6SE7SE8SE7S5S5S3S8S5CalmS4SE55S5S7SE7
2 days agoW10W95CalmW10SW6CalmS6S3SE5S6S6SE8S8SE5S10S5S9S6W5S5S10S13S10

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 (16,3,4,5)
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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.