Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Heron, MT

Version 3.4
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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 5:49AMSunset 7:51PM Wednesday August 21, 2019 5:04 AM PDT (12:04 UTC) Moonrise 10:40PMMoonset 11:52AM Illumination 67% Phase: Waning Gibbous; Moon at 21 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 211139
afdotx
area forecast discussion
national weather service spokane wa
439 am pdt Wed aug 21 2019

Synopsis
Today a cold front will produce gusty winds and a chance for
rain. Shower chances linger over idaho Thursday, then limited
chances linger along the canadian border Friday afternoon.

Temperatures cool after today, with highs in the upper 70s and 80s
through the middle of next week. Otherwise the weather looks
mostly dry.

Discussion
Today through Thursday: a cold front moves across the region with
the threat of rain and increased winds. Winds will be most
notable this afternoon and evening as the leading gust front
crosses west to east. This morning the cold front was coming onto
the coast. It will push inland through the day and evening, before
moving to the panhandle overnight. This morning the main rain
chances will be around the cascades. This afternoon the risk
expands to the north-central wa through western columbia basin.

Then late this afternoon into evening the rain threat expands into
the eastern third of wa and the id panhandle. Overnight the
threat of precipitation backs against the cascade crest and shifts
into the eastern third of wa and the id panhandle, with the
overall best risk over the id panhandle. The risk wanes elsewhere.

Some thunderstorms may be mixed in around the northern mountains
in the late afternoon and evening and then around the panhandle
late in the evening and overnight, where some pockets of
instability lay.

Winds will be the second but the more noticeable and potentially
more impacting feature of the system. Speeds gradually increase
through the morning to midday, before a more notable gust front
starts to push east from the cascades into the columbia basin
through the afternoon (1-4 pm). The gust front spreads into the
eastern third of wa and lower idaho panhandle in the late
afternoon and early evening (4-7 pm). This could bring a quick
1 or 2 hour period winds with speeds of 15-25 mph, with gusts of
30 to 45 mph. The more sheltered mountain valleys are expected to
see 8-15 mph winds with gusts to 20-30 mph. Possible impacts: (1)
this could lead to some pockets of blowing dust over the columbia
basin into the palouse. (2) area bodies of water could see some
chop and wind waves which may impact smaller vessels. (3) the
sudden burst of winds could lead to some minor tree damage,
especially for any weakened or dead trees and branches fallen on
power lines could yield a few power outages.

Thursday the front continues to shift east. The main threat of
precipitation in the developing northwest flow lingers around the
mountains of northeast wa and the id panhandle. Some shallow
instability over north idaho will keep a threat of embedded
thunderstorms alive, but the risk is slight.

Temperatures will be remain warm today, but values are expected
to be cooler than yesterday. Thursday, however, temperatures will
be slightly cooler than normal on the backside of the cold front.

Cote'
Thursday night through Sunday: dry weather is expected Thursday
night as the upper trough exits the region. Nearly zonal flow
aloft will set up over the pacific northwest Friday and continue
through the weekend. Guided by a strong westerly jet stream over
the eastern pacific, weak weather systems will likely pass through
this flow. A slight chance of showers is expected mainly over the
mountains along and north of the canadian border. More notably,
these weather systems will bring the potential for breezy west to
southwest winds across east slopes of the cascades, waterville
plateau, the palouse, and into the spokane area. Both Saturday and
Sunday could be breezy days. Temperatures through Sunday will be
within a few degrees of normal for this time of year.

Monday through Wednesday: high pressure will begin to amplify over
the eastern pacific early next week, with northwesterly flow over
the inland nw. Shortwave energy may clip far northern idaho during
this time and bring a slight chance of showers. High pressure
will then likely build inland toward the middle of next week,
bringing a warming trend to the region. Dang

Aviation
12z tafs: a cold front will be moving into the cascades this
morning and pushing across eastern wa and north id between
this afternoon and tonight. Expect thickening clouds this
afternoon and evening, with rain shower chances spreading from
west to east. Some risk starts near eat mwh around 18-21z, but
the better passes between 22-00z. Chances approach
geg sff coe puw lws toward 01-04z and remain high through 07-08z.

MVFR conditions possible near geg sff coe puw with and after
the precipitation threat. Winds will be on the increase ahead of
and along the front. Speeds increase through the day, but
the strongest are expected in the afternoon to early evening
when values of 15-25kts with gusts to 35kt or higher possible,
and the direction switching from south southwest to
west northwest, before shifting back to southwest. Some brief
blowing dust haze is possible with the gusty winds ahead of the
precipitation. Cote'

Preliminary point temps pops
Spokane 87 55 79 53 80 55 0 40 10 0 0 0
coeur d'alene 88 57 77 52 79 53 0 50 20 0 10 0
pullman 86 51 76 48 80 51 0 50 10 0 0 0
lewiston 93 63 82 57 87 61 0 50 10 0 0 0
colville 92 49 85 45 83 44 20 30 20 0 10 10
sandpoint 86 55 75 50 77 50 0 50 40 0 10 10
kellogg 86 58 72 54 75 56 0 70 40 0 10 0
moses lake 88 55 83 52 85 55 30 50 0 0 0 0
wenatchee 82 59 81 59 83 60 40 40 0 0 0 0
omak 85 56 83 57 82 55 40 40 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, ID37 mi69 minN 010.00 miFair52°F46°F82%1014.2 hPa

Link to 5 minute data for KSZT

Wind History from SZT (wind in knots)
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Last 24hrCalmCalmCalmNE4NE3E7NE9SE4CalmCalmE5E5E4CalmCalm----CalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmS4SW6SW8S10SW7S7W6SW3S7SW3Calm------CalmCalmCalm--CalmCalm
2 days agoCalmCalmS4SW3SW6CalmW10S6W8S11
G17
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SW5SW7W5Calm------CalmW3CalmCalmCalmCalm

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 (8,2,3,4)
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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.