Sunday, August20, 2017 L-36.com


Marine Weather and Tides
Sandpoint, ID

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 5:49AMSunset 7:50PM Sunday August 20, 2017 4:48 AM PDT (11:48 UTC) Moonrise 4:24AMMoonset 7:22PM Illumination 3% Phase: Waning Crescent; Moon at 28 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 Sandpoint, ID
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location: 48.28, -116.54     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 201135
afdotx
area forecast discussion
national weather service spokane wa
435 am pdt Sun aug 20 2017

Synopsis
Bands of mid and high clouds are expected to move over the pacific
northwest today, but we will see clearing overnight. Skies should
be favorable for viewing the eclipse Monday morning, however
there may be some smoke in the northern valleys. Tuesday and
Wednesday will be quite warm with afternoon temperatures in the
upper 80s to mid 90s. A vigorous cold front on Wednesday night
will have the potential to produce thunderstorms, with strong
winds expected on Thursday.

Discussion
Today through Monday night: a dry northwest flow will continue
today before weak high pressure begins building on Monday. A weak
wave embedded within the northwest flow will track across southern
bc today clipping northern washington and the north idaho
panhandle. Main impact from this will be mid and high level cloud
cover. This wave exits tonight bringing clearing skies.

For Monday (eclipse day), the 00z GFS and ECMWF model progs show
a band of cirrus moving into central washington in the morning
reaching the idaho panhandle during the late morning or early
afternoon. Satellite imagery shows quite a bit of high clouds to
our west-northwest so this idea is accepted. This moisture is
very high up (above 300 mb) and shouldn't have much of an impact
on eclipse viewing. The other issue of note is smoke and haze
which moved into NE washington and the N idaho panhandle
yesterday. Southwest winds this afternoon is expected to improve
the smoke haze situation for the spokane coeur d'alene area but
isn't expected to bring much improvement to the northern valleys
and N idaho panhandle where lighter winds are expected.

Still... The smoke haze isn't as bad as what occurred during the
first 10 days of august and probably won't have to much of an
impact on the eclipse. Mostly clear skies and the weak ridge will
allow for the beginning of a warming trend with highs in the mid
to upper 80s for most towns with the warmest spots in the lower
90s. Jw
Tuesday and Wednesday: our forecast for Tuesday and Wednesday has
changed little. The models continue to forecast the amplification
of a broad high pressure ridge on Tuesday leading to above average
temperatures. Tuesday should be our warmest day with high
temperatures in the upper 80s to mid 90s. We will have light
winds in the lowest 8 to 10 thousand feet of the atmosphere on
Tuesday under our 500mb ridge. With smoke being produced by fires
in bc, oregon, central idaho, and north central washington, it may
be tough to escape the haze and smoke. With fires all around, our
only "clean" wind direction is out of the west. On Wednesday, the
500mb ridge axis will migrate into montana allowing increasing
on-shore flow to bleed a bit of marine air into our region. Look
for our temperatures to be a couple degrees cooler Wednesday
afternoon with afternoon winds of 5 to 15 mph.

Thursday: the evening runs of the gfs, ecmwf, and canadian models
continue to suggest that Thursday will be our most volatile
weather day of the week. It is still possible that the timing and
intensity of this storm could change, but at this time it looks
like it could be one of our most noteworthy events of the summer.

A vigorous cold front is expected to push through the inland
northwest during the early morning hours.

*thunderstorms: a ribbon of mid-level moisture and instability is
forecast along and ahead of the cold front suggesting scattered
showers and thunderstorms over the idaho panhandle and southeast
washington early in the day Thursday. Model soundings suggest
high cloud bases and fast storm motion. It is too early to tell
how much lightning may accompany storms early on Thursday, but it
does not appear that fast moving, high-based cells will produce
much wetting rain. Given the extreme dryness of july and august,
our fuels are critically dry. Any lightning at this stage is a
potentially significant wildfire concern.

*wind: a negatively tilted 500mb trough tracking along the
washington bc border is notorious wind producing pattern. Strong
cold advection will occur Thursday into Thursday evening. Steep
lapse rates from the surface to 700mb will allow efficient
downward momentum transfer from late morning through early
evening. Fortunately, model winds aren't stronger in the layer
around 800-850mb (30-35kts), or our gust potential would be
higher. At this time, it looks like sustained 20 to 25 mph winds
with gusts of 30 mph or more across the columbia basin, palouse,
and west plains from late morning through early evening.

Localized gusts up to 40 mph will be a good bet through the
cascade gaps around wenatchee, entiat, chelan, and vantage.

*blowing dust: the magnitude of the wind and the duration of the
wind through the afternoon into the evening will heighten the
risk of blowing dust. We have had little to no measurable
precipitation across the dryland wheat country since late
june... Leaving the region susceptible to blowing dust.

Friday and Saturday: temperatures on Friday will be noticeably
cooler in the wake of Thursday's strong front. Much of the inland
northwest will only top out in the 70s to around 80. Our temps
will rebound a bit on Saturday... Close to seasonal normals.

Gkoch

Aviation
12z tafs: main aviation concern will be smoke settling into the
valleys of NE wa and N id with the overnight inversions. Overall,
confidence remains low for restrictions at the main terminals but
is MVFR visibilities are possible at colville, deer park, bonners
ferry, and sandpoint. Otherwise... Expect generally light winds
with afternoon gusts around 15 mph. Jw

Preliminary point temps pops
Spokane 81 57 85 61 90 63 0 0 0 0 0 0
coeur d'alene 81 53 86 55 91 58 0 0 0 0 0 0
pullman 79 52 85 54 91 59 0 0 0 0 0 0
lewiston 87 60 92 62 97 66 0 0 0 0 0 10
colville 82 51 86 52 91 54 0 0 0 0 0 0
sandpoint 81 46 84 48 87 51 0 0 0 0 0 0
kellogg 77 50 84 54 89 55 0 0 0 0 0 0
moses lake 86 55 90 57 94 60 0 0 0 0 0 0
wenatchee 86 62 89 64 93 65 0 0 0 0 0 0
omak 86 59 90 60 94 62 0 0 0 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
Sandpoint, Sandpoint Airport, ID2 mi73 minN 010.00 miFair45°F37°F76%1017.9 hPa

Wind History from SZT (wind in knots)
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Last 24hrSW3S6SW7SW7S9
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1 day agoCalmCalmCalmCalmSE4S6S6S7SW8S7SW11
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2 days agoCalmCalmCalmS5SW5SW5S8SW4SW9
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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
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GOES Local Image of PacificNorthwest    EDIT
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Wind Forecast for Spokane, WA (7,2,3,4)
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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.