Saturday, April29, 2017 L-36.com


Marine Weather and Tides
Heron, MT

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 5:28AMSunset 7:59PM Saturday April 29, 2017 10:36 AM PDT (17:36 UTC) Moonrise 8:18AMMoonset 11:53PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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 Heron, MT
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location: 47.98, -116     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 291213
afdotx
area forecast discussion
national weather service spokane wa
513 am pdt Sat apr 29 2017

Synopsis
Increasing clouds ahead of the next pacific storm system today
with sprinkles possible in the afternoon and early evening. A
better chance for rain and high mountain snow will come Saturday
night and then turn breezy on Sunday with a cold front passage.

The middle of next week will be warm with afternoon temperatures
in the 60s to near 70 degrees before returning to a cooler and
unsettled pattern by the end of the week.

Discussion
Today through Sunday night: the next 24 hours will be impacted by
a shortwave trough that is currently out at 140w 50n early this
morning. The surface low will remain well north of the region and
move into central to northern bc this afternoon. A warm frontal
boundary will extend from the low south into the region with
increasing clouds over the region today. Best potential for
measurable precip will be over the east slopes of the northern
cascades and the northern mtns. The valleys and basin will be dry
enough at lower levels today that any precip is mainly expected to
be in the form of sprinkles.

The trailing cold front will push across the cascades Sunday
morning. The cold front will produce better lift a greater chance
for rain and high mountain snow across the eastern half of the
region. A rain shadow will keep downsloping areas in the lee of
the cascades such as wenatchee, omak and moses lake dry. The cold
front will sweep on through fairly quickly with up to around a
quarter of an inch possible for the panhandle and that is about
it as far as precip is concerned. Stevens pass will see the
possibility for some light snow by Sunday morning with snow levels
dropping and moisture slopping over the cascade crest. Surface
pressure gradients will tighten for Sunday afternoon behind the
front with breezy conditions developing. Strongest winds in our
area are expected to be at wenatchee with gusts up to 25 to 35
mph possible. /svh
Monday: Monday will be less windy as one final weak shortwave moves
through the northwest flow aloft. This will keep rain chances in
the forecast and one more day of high temperatures in the mid 50s.

All models are in agreement that this will be a quick moving
trough with a rain shadow keeping showers relegated mostly to the
terrain surrounding the basin, though an isolated shower in the
eastern basin can't be ruled out.

Tuesday through Thursday: Tuesday begins our transition to a much
different weather pattern than we've become accustomed to this
spring; warm and dry with plenty of sun. This change comes
courtesy of a robust ridge of high pressure over the eastern
pacific which begins to move onshore Tuesday. This period will be
dry as the stabilizing ridge axis crosses the region Wednesday.

We'll warm into the upper 60s and lower 70s on Wednesday, above
average for early may. Our warmest day, though, will be Thursday.

850 mb temperatures reach nearly 16 c Thursday afternoon which
will mean widespread high temperatures in the 70s.

Thursday night through Saturday: this period of the forecast
carries less certainty, as long range models diverge
significantly on how quickly to break down our ridge. The ec wants
to bring in a deeper trough of low pressure which would bring
more rain Thursday evening through Friday, while the GFS and
canadian are much less amplified and drier with the next trough.

For now we will keep a chance of showers in the panhandle
mountains and the eastern washington zones. Confidence is low on
exact placement and timing of showers, but high for the breakdown
of the ridge and generally a return to a cooler and unsettled
pattern by Friday. /bw

Aviation
12z tafs: a flat ridge of higher pressure is building in over the
region early this morning. Much of the region will see clear
conditions early in the morning except for lingering mid level
clouds and patchy valley fog over the id panhandle. A warm front
will bring increasing cloud cover across the region through the
late morning and afternoon hours. Virga or possibly some
sprinkles will be possible by the late afternoon and early
evening. The trailing cold front will arrive overnight Saturday
with rain possible at kgeg, ksff, kcoe, kpuw and klws after 06z.

Preliminary point temps/pops
Spokane 57 44 58 36 56 38 / 0 60 20 10 20 20
coeur d'alene 57 42 56 34 55 36 / 10 80 50 10 30 20
pullman 59 45 58 37 54 39 / 0 70 50 10 20 20
lewiston 65 49 64 41 61 43 / 0 40 30 10 20 20
colville 58 42 60 38 59 36 / 10 30 20 0 30 30
sandpoint 56 41 54 34 54 35 / 10 80 80 20 30 30
kellogg 55 40 52 33 50 36 / 10 90 90 20 30 40
moses lake 63 47 66 39 63 38 / 10 10 10 0 10 0
wenatchee 60 46 62 40 61 41 / 10 10 10 0 10 10
omak 61 43 65 39 62 39 / 10 10 10 0 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
Sandpoint, Sandpoint Airport, ID37 mi42 minSSW 410.00 miFair50°F37°F62%1024 hPa

Wind History from SZT (wind in knots)
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Last 24hrS6SW4SE6SE4S3S6CalmCalmSE6CalmCalmCalmCalmCalmCalmCalmCalmCalmW3CalmCalmCalmCalmS5
1 day agoSW7SW7S7S8CalmS5CalmCalmCalmCalmSW5SW5SW3CalmS4W4S3CalmCalmSW4S4SW4SW5SW7
2 days agoCalmSE3SE8E3NE3NE4N6E5NE3SW7SW3SW3SW4SW6S6S6S4SW3S5S3CalmSW3SW4S4

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
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Spokane, WA (13,3,4,5)
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Ground Weather Radar Station Spokane, WA
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weather_mapweather_map weather_map

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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.