Friday, March22, 2019 L-36.com


Marine Weather and Tides
Heron, MT

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 6:46AMSunset 7:02PM Thursday March 21, 2019 10:51 PM PDT (05:51 UTC) Moonrise 8:01PMMoonset 7:31AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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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Area Discussion for - Spokane, WA
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Fxus66 kotx 220448
afdotx
area forecast discussion
national weather service spokane wa
948 pm pdt Thu mar 21 2019

Synopsis
Friday will be a few degrees cooler as clouds increase ahead of a
weak cold front. The chance for showers will increase Friday night
as the front moves across the region. The weekend will feature
temperatures near average with rain and mountain snow showers over
the idaho panhandle and portions of eastern washington. Typical
cool and showery weather is expected much of next week with high
temperatures mainly in the 50s.

Discussion
Tonight: tonight will be another chilly one with light winds and
mainly clear skies. Bands of high clouds will wrap around low
pressure over the great basin, but the high level moisture
shouldn't hinder radiational cooling much. Most lowland
communities across the inland northwest will experience overnight
temperatures in the 30s.

Friday: a slow moving trough will reach the wa or coast Friday
afternoon spreading increasing mid and high clouds across
washington and north idaho on Friday. Most of our region should be
2 to 5 degrees cooler on Friday than today. Showers associated
with the incoming trough will mainly be limited to western
washington and the high terrain of the cascades.

Friday night and Saturday: a weak cold frontal passage will occur
fri night as the upper level trough shears and stretches apart.

The strongest moisture advection and upper level support will dig
into california and nevada Fri night into Saturday. The models
have been pretty consistent very little measurable precipitation
across the columbia basin and north central washington Fri night.

The help of orographic forcing should yield some rain and snow
showers over the idaho panhandle on Saturday. With snow levels
expected to be around 4500 feet, skiers may witness periods of
light snow.

Saturday night and Sunday: up through Saturday night,
precipitation amounts look to be showery and light. We will be
watching Saturday night and Sunday for the potential of some more
significant amounts as a shortwave pivots northeast out of
northern nevada. The potential for wet snow accumulations (above
4000 ft) and the potential for rain onto fields soaked by melting
snow are reasons to monitor this wave. Model agreement isn't good
with the track and timing of this wave. The GFS lifts the wave
far enough north Saturday night to produce a quarter to half inch
of liquid equivalent across the southern idaho panhandle and clips
the camas prairie with enough moisture for accumulating snow
above 4000 feet. The NAM is slower with the majority of the
precipitation arriving during the day Sunday. The ECMWF drags the
trough far enough south yielding much lighter and spottier
precipitation. The NWS blend of models seems to favor the track
further south similar to the ECMWF which is reflected in our
forecast. Gkoch
´╗┐Monday to Thursday: the inland northwest will be in a more
active pattern, with periodic opportunities for precipitation.

Looking at the big picture a broad trough sets up off the coast
and sends occasional shortwaves inland. There are timing
disagreements regarding these individual features, which basically
means there are modest chances for precipitation but we are still
pinning down when chances will be highest. One wave exits early
Monday and a second comes through sometime between Monday night
and Tuesday. So Monday looks mostly dry, save for limited shower
chances in the north early and then in the cascades and far
western basin later in the day. Then Monday evening into Tuesday
broader chances expand across the region, with some suggestion
that the threat will lift toward the mountains into Tuesday
afternoon. This is accompanied by some breezy conditions.

Additional impulses will bring additional shower chances going
into Wednesday and Thursday.

As for precipitation-type: overall it looks like valley rain and
mountain snow, with snow levels averaging 3-4kft. However
nighttime temperatures will be near freezing in spots, enough to
allow for some mix down to valley floors. As for precipitation
amounts: some moderate amounts are possible closer to the cascades
and far western columbia basin and northern mountains with the
Monday Tuesday front. Where this falls as snow will largely be in
the mountains, but we will have to monitor the cascades passes and
places like sherman pass for travel impacts. Overall afternoon
temperatures are expected to be near seasonal norms, while
overnight lows are expected to be near to slightly below normal.

Cote'

Hydrology
A flood watch has been issued for areas in and around moscow
idaho. Paradise creek rose sharply last evening in response to
lowland snow melt. It crested a foot shy of flood stage (9.2
feet) before dropping this morning. Another rise will occur this
afternoon and evening as our diurnal melting cycle begins. The
paradise creek basin still has ripe snow. If a similar amount of
water (roughly 110 cubic feet per second) reaches the river gauge
tonight, the river will be close to flood stage. Tomorrow
afternoon looks 3 to 5 degrees cooler. The basin will also be
gradually losing snow the next few days. By the weekend, cooler
temps and less runoff should lead to lower flows into paradise
creek.

For the remainder of the palouse, west plains, and upper columbia
basin, snow cover will become increasingly patchy the next few
days. As the snow disappears, we expect some more minor field
flooding. Snow is ripening in the lowlands of bonner and boundary
counties, so small streams are expected to experience rises the
next few days. At this time, the precipitation moving into the
region for the weekend looks to be showery with light basin
average amounts. This is generally good news, along with the
arrival of cooler daytime temperatures over the weekend into
early next week. Gkoch

Aviation
06z tafs: high level clouds will move across the region from the
southeast tonight. The clouds will thicken overnight and towards
morning. Winds will remain light. Chance of rain comes into play
towards 06z Sat for lws and perhaps puw, but there is a lot of dry
air aloft to overcome. Wouldn't be surprised if sprinkles at best
and the rain comes aft 06z.

Preliminary point temps pops
Spokane 34 57 38 54 35 53 0 0 10 20 20 20
coeur d'alene 33 55 38 51 34 50 0 10 20 20 30 30
pullman 34 55 38 47 33 47 0 0 20 20 20 20
lewiston 38 59 43 53 37 54 0 0 30 30 20 20
colville 27 58 37 54 33 54 0 10 20 30 20 30
sandpoint 31 53 36 50 34 48 0 10 20 30 30 40
kellogg 37 56 37 51 34 50 0 10 20 30 30 50
moses lake 35 63 39 59 34 58 0 0 10 0 10 0
wenatchee 38 58 41 54 36 54 0 0 30 0 10 10
omak 34 62 39 56 36 54 0 0 30 10 20 20

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 mi76 minN 010.00 miFair34°F30°F87%1012.9 hPa

Wind History from SZT (wind in knots)
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Last 24hrCalmCalmCalmCalmW3W3CalmCalmCalmCalmCalmNE8NE9E5NE10
G15
NE10E4NE6--CalmCalmW3CalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmW3NE12
G16
NE9NE10NE9E9E7SE7SE3CalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmW4CalmCalmCalmCalmCalmCalmCalmNE9NE8NE12
G15
NE6E3SE3E3CalmCalmCalmCalmCalmW3

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.
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Wind Forecast for Spokane, WA (1,6,7,8)
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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.