Tuesday, June25, 2019 L-36.com

Marine Weather and Tides
Winthrop, WA

Version 3.4
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 5:03AMSunset 9:04PM Tuesday June 25, 2019 7:35 PM PDT (02:35 UTC) Moonrise 12:23AMMoonset 12:20PM Illumination 39% Phase: Third Quarter Moon; Moon at 23 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 Winthrop, WA
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location: 48.47, -120.18     debug

Area Discussion for - Spokane, WA
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Fxus66 kotx 260103
area forecast discussion
national weather service spokane wa
547 pm pdt Tue jun 25 2019

After a couple days of mild weather, a return to cool and showery
weather is expected late this week with the arrival of a slow
moving low pressure system. Wednesday has the potential to be our
most active day with a good chance for showers and thunderstorms
region wide. Some thunderstorms may produce hail and gusty winds
over the idaho panhandle and southeast washington Wednesday
afternoon. Scattered showers and thunderstorms are expected to
linger Thursday into Friday before a warming and drying trend
arrives over the weekend.

Tonight through Wednesday night: the weather will remain active
across the inland northwest through the next 48 hours as an upper
level area of low pressure off the wa coast slowly moves inland.

Currently a southerly flow aloft and the surface is increasing
moisture across eastern wa and north idaho. Surface based
instability has lead to convection developing across the
mountains, especially north central wa where isolated to scattered
lightning has been occurring and should persist through early
evening. An area of showers span from southeast washington into
the central panhandle which could also spawn isolated
thunderstorms through the evening. The surface based convection
will wane this evening, although mid level instability will return
overnight as a slug of moisture with a weak impulse moves
northward overnight into Wednesday morning. This will keep cloud
cover across much of the region with light showers or sprinkles
especially across central and parts of eastern washington. Could
see a small chance of thunderstorms over the cascades by early
Wednesday morning when the mid level lapse rates peak with the
weak impulse. Temperatures will warm slightly with the increase of
moisture. The upper level low shifts into the west coast of wa,
providing good diffluence aloft east of the cascades. Instability
will be on the rise with most unstable capes spanning from the
blue mountains, across the lc valley into central panhandle
mountains with values of 1500 j kg to near 2000 j kg. This is
pretty impressive for our area and leaning toward a slight chance
for severe weather as indicated by SPC with the potential for
gusty winds and hail. Heavy downpours will be possible with pwats
of 0.8" to near 1 inch. Gusty winds will develop Wednesday
afternoon and evening with the synoptic passage of a surface
trough, but also the outflow winds from the thunderstorms. The
convection will shift from strong thunderstorms to a band of
showers with embedded thunderstorms late Wednesday night with
widespread rain showers. After the few degrees of warming on
Wednesday, temperatures should remain mild Wednesday night. Rfox.

Thursday through Tuesday: the closed upper low will continue to
drift eastward, and by Thursday will be near the wa or coastline.

Shortwave energy will continue to rotate northward around this
parent low, bringing the lift and moisture needed for additional
convection. The one limiting factor is that instability looks to
be a fair bit weaker Thursday compared to Wednesday (up to 600
j kg of CAPE Thursday, vs 1000-1600 j kg Wednesday per the nam).

As such, while scattered showers and thunderstorms are still
likely Thursday, the potential for stronger activity will be much

The upper low will move inland on Friday, bringing scattered
showers and perhaps a few thunderstorms. With the low sitting
nearly overhead, it may be difficult to muster up much instability
as more cloudy skies limit the amount of solar radiation we see.

The upper low moves eastward toward the rockies this weekend, but
our forecast area will remain under cyclonic flow aloft. As such,
we will continue to see isolated to scattered showery activity,
and possibly a few thunderstorms. The slight chance of showers and
thunderstorms will continue into early next week.

A warming trend is expected through much of the period. Below
normal temperatures will likely continue through Saturday and
reach near normal by Sunday. Forecast highs will largely be in the
70s and 80s early next week.


00z tafs:VFR conditions are expected to continue at all TAF sites
during the next 24 hours. For tonight, we don't foresee any issues
as most of the showers and thunderstorms will either remain near the
cascades (and spare wenatchee) or occur near the canadian border. A
more robust band of showers and thunderstorms currently over NE or
and nc id could near lewiston, this evening but suspect most of it
will remain SE of the airport. Clouds will be on the increase
overnight as a weak disturbance sweeps in from the south. This
cloudiness will be associated with an area of mid-level instability
and could trigger some showers but they will be very hit or miss. A
stray thunderstorm will also be possible, but not likely. The main
show for weather will likely come right at the end of the forecasts
as strong thunderstorms could develop over NE or and sweep rapidly
to the ne. If things work out as expected lws and puw would be hit
first with the possibility of strong winds gusts and large hail. If
the storms hold together they would impact geg-sff-coe next. The
timing in the tafs might be a little too fast for tomorrow, but we
wanted to include some mention at the tail end of the forecast. Fx

Preliminary point temps pops
Spokane 51 78 51 70 48 69 20 20 60 40 20 20
coeur d'alene 50 79 52 70 48 69 10 20 60 50 20 20
pullman 48 75 49 67 45 66 20 40 70 30 20 20
lewiston 55 80 57 73 53 73 30 50 70 50 40 30
colville 42 83 43 75 39 73 10 20 70 70 40 40
sandpoint 47 76 50 68 46 68 10 20 80 70 40 50
kellogg 52 76 53 68 50 66 20 20 60 50 40 30
moses lake 53 79 53 76 48 74 20 20 50 30 10 10
wenatchee 56 76 57 72 53 71 10 30 70 50 30 30
omak 53 77 55 73 50 71 20 30 70 70 60 60

Otx watches warnings advisories
Id... None.

Wa... None.

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Omak Airport, WA35 mi42 minN 17 G 2510.00 miFair72°F43°F35%1007.8 hPa

Wind History from OMK (wind in knots)
Last 24hrN10N15
1 day agoNW11NW12N9NW6N9N9N9N9N9N10N5N5N7NE10NE8NE8
2 days agoW6NW10NW12NW9N10N8N9N8NW5W5W94CalmSE4E35366CalmSE4NW10

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Spokane, WA (22,6,7,8)
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Ground Weather Radar Station Spokane, WA
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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.