Tuesday, December18, 2018 L-36.com


Marine Weather and Tides
Ponderay, ID

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:29AMSunset 3:58PM Tuesday December 18, 2018 3:53 AM PST (11:53 UTC) Moonrise 2:41PMMoonset 3:29AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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 Ponderay, ID
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location: 48.36, -116.55     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 181052
afdotx
area forecast discussion
national weather service spokane wa
252 am pst Tue dec 18 2018

Synopsis
Rain and heavy mountain snow will accompany a moist frontal system
today. Wind gusts of 40 mph will also be possible this afternoon
and evening across southeast washington and the west plains.

Another wet system will bring more rain and mountain snow
Wednesday night into Thursday night. Drier and cooler weather is
forecast for Friday, followed by snow chances over the weekend and
early next week.

Discussion
Wet and windy today with heavy snow in the mountains...

today and tonight: widespread lowland rain and heavy mountain
snow will accompany the passage of a moisture laden frontal system
today. As of 2 am, nearly the entire state of washington was
experiencing rain ahead of an incoming frontal system. The
heaviest and most widespread precipitation will occur this morning
along and ahead of the front. This afternoon and evening, look
for increasingly gusty winds and precipitation to become more
focused over the mountains.

*valley snow: with the exception of a few communities tucked in
the cascades, populated areas throughout north idaho as well as
central and eastern washington were experiencing rain. Observing
sites around mazama and twisp were reporting temperatures in the
low 30s suggesting wet snow in the upper methow valley. Our
updated forecast calls for 2 to 5 inches this morning for the
upper methow valley before snow transitions to rain. Web cameras
around lake wenatchee and between leavenworth and stevens pass
also suggested that accumulating snow was occurring early this
morning.

*mountain snow: motorists with plans to travel over stevens pass
today should be prepared for heavy accumulations with totals up
to 15 inches by early this evening. Other cascade passes
including blewett and loup loup will receive 8 to 12 inches
today. Sherman pass on hwy 20 between republic and kettle falls
will also receive periods of heavy snow this morning before a
transition to snow showers this afternoon. Lookout pass on i-90
will likely receive periods of heavy snow this morning with a
potential to transition to rain for several hours this afternoon
before changing back to snow tonight.

*heavy rain: elevations below 4000 feet in the idaho panhandle are
expected to receive between 0.75" and 1.25" of rain by tonight.

The washington palouse will have the potential for similar
amounts. Rises on small streams and creeks are expected. Minor
field flooding may also occur which has prompted the flood watch
for whitman county which has a history of field flooding during
winter rain events.

*gusty winds: winds are expected to peak this afternoon and early
this evening along and behind the passing front. The foothills
of the blue mountains, the palouse, and west plains can expect
sustained southwest winds of 20 to 25 mph with gusts as high as
40 mph.

Wednesday night through Monday: the next round of precipitation
arrives Wednesday night through Thursday night across the inland
nw, although it does not look to be as wet as the current system.

Confidence looks good on the timing and strength of this feature.

Temperatures and snow levels will be slightly lower at the onset
with snow transitioning to a rain snow mix as a strong warm front
sweeps across the region from the southwest. Isentropic lift will
be strong across north central washington into north idaho
Thursday. A strong cold front pushes from west to east by Thursday
evening with a band of rain snow followed by breezy westerly
winds. 24 hour QPF will range from 0.10" to 0.20" across the
columbia basin to 0.5" to 1.0" plus in the cascades and panhandle
mountains. This translates to significant mountain snow above 4500
ft for the northern cascades and selkirks with up to a foot of
new snow possible. Breezy winds with gusts of 25 to 35 mph will
develop Thursday afternoon and evening with the frontal passage.

After the front exits, colder air arrives under northwest flow aloft
and high pressure builds in Friday and Friday night. Winds will
taper off and precipitation wanes with just a few snow showers
over the mountains. A weak disturbance passes through the region
on Saturday with a small chance of snow showers.

By Saturday night into Monday, models diverge on solutions as at
least two storm systems impacting the inland nw. While the GFS and
canadian shows a progressive trough swinging through the region by
Sunday, the ECMWF wants to cut off this wave and sink it south
over california and missing the inland nw. This would impact
precipitation amounts across the area. Models show another storm
system arriving by Monday with similar trends in the tracks. Opted
to blend the different solutions for the extended forecast and
keep an unsettled pattern for inland NW through the weekend and
christmas eve. Temperatures and snow levels would support snow in
most areas especially in the overnight and morning hours with a
rain snow mix by afternoon. Rfox

Aviation
06z tafs: a strong storm system will continue to move in. Rain
will expand from west to east through the next several hours
(06-10z) at TAF sites, becoming moderate at times. (snow is
expected to remain mostly in the mountains and some of the higher
valleys near the cascades.) this will promote MVFR ifr
conditions, with some periods of moderate steady rain expected.

Additionally llws is expected with speeds aloft in the 35-45kt
range, out of the west or southwest. General surface winds will
then start to increase going into Tuesday, gusting near 20-35kts.

The precipitation is expected to be more showery between later
Tuesday morning to afternoon, then decrease. However winds are
expected to remain breezy into at least the evening. Cote'

Preliminary point temps pops
Spokane 50 35 42 33 42 32 100 50 0 20 60 60
coeur d'alene 48 35 40 33 41 32 100 90 20 40 60 60
pullman 50 37 43 34 44 32 100 90 10 10 40 50
lewiston 54 40 50 38 50 36 100 70 0 10 30 50
colville 45 31 43 30 42 28 100 40 0 60 70 60
sandpoint 42 35 38 33 39 31 100 100 50 40 70 80
kellogg 41 34 38 33 41 32 100 100 50 30 60 70
moses lake 53 34 47 34 45 31 90 10 0 20 50 30
wenatchee 47 35 44 35 42 31 90 10 10 50 60 50
omak 46 31 43 32 41 29 100 20 0 70 70 50

Otx watches warnings advisories
Id... Winter weather advisory until noon pst today above 4000 feet for
central panhandle mountains.

Winter storm warning until 4 am pst Wednesday above 4000 feet
for northern panhandle.

Wa... Winter storm warning until 4 am pst Wednesday above 4000 feet
for northeast mountains.

Winter storm warning until noon pst today above 3500 feet for
okanogan highlands.

Winter storm warning until 4 am pst Wednesday above 3000 feet
for east slopes northern cascades.

Flood watch from 6 am pst this morning through this afternoon
for washington palouse.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sandpoint, Sandpoint Airport, ID4 mi79 minSW 510.00 miRain37°F35°F93%1010.2 hPa

Wind History from SZT (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmS4SW4SW4S3CalmCalmCalmCalmCalmCalmCalmCalmS3S7S5SW5S7
1 day agoNE7NE6NE9NE10NE7NE7NE4NE4NE4CalmNE3NE4NE4NE6E4CalmW3N4CalmCalmCalmCalmCalmCalm
2 days agoSW9SW7
G14
SW4S4S7S8S7SW4SW5SW3CalmCalmW3N4N6N4NE3NE12CalmNE3NE7NE7N3NE6

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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GOES Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

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Wind Forecast for Spokane, WA (6,6,7,8)
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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.