Saturday, April21, 2018

Marine Weather and Tides
Yakima, WA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:00AMSunset 8:00PM Saturday April 21, 2018 12:33 AM PDT (07:33 UTC) Moonrise 9:41AMMoonset 12:22AM Illumination 34% Phase: Waxing Crescent; Moon at 6 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 Yakima, WA
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location: 46.61, -120.53     debug

Area Discussion for - Pendleton, OR
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Fxus66 kpdt 210527
area forecast discussion
national weather service pendleton or
1027 pm pdt Fri apr 20 2018
updated aviation discussion

Short term Tonight and Saturday... Ridge of high pressure over the
region is breaking down which is allowing a cold front to approach
the region. This front will pass over the forecast area early
Saturday. There will be increasing clouds overnight but there is not
a lot of precipitation associated with the front. So, other than
some showers along the cascades and over the mountains of northeast
oregon this will be a dry cold frontal passage. The main impact will
be increasing westerly winds through the day peaking in the
afternoon and evening and then decreasing overnight. Temperatures
will also be around 10 degrees cooler.

Aviation 00z tafs...VFR conditions will prevail over the next 24
hours at all TAF sites. An approaching cold front is spreading some
mid level clouds into the forecast area overnight and then
rapid clearing behind the front early Saturday. Winds will generally
be less than 12 kts overnight but increase out of the west 10-20kts
behind the front with gusts 25-30 kts. Winds decreasing after 00z.

Prev discussion issued 459 pm pdt Fri apr 20 2018
short term... Tonight through Monday... Mostly sunny skies and
seasonably warm temperatures prevail this afternoon as a transient
ridge of high pressure is crossing eastern or wa. High clouds are
beginning to increase near the cascade crest in advance of the next
system. Clouds will stream east across the local area this evening,
lowering and thickening overnight. By late tonight, initial precip
will spill over the crest, with the greatest coverage of precip
across the wa cascade east slopes where chance pops will be used.

Further east, most areas will remain dry, with perhaps an upslope
isolated shower across the eastern or mountains. Mild low
temperatures can be expected tonight with the increase in cloud
cover, with readings in the 40s for the lower elevations and mainly
30s in the mountains.

The mid upper level trough and cold front will cross the area
Saturday morning, exiting to the east in the afternoon. Deep layer
moisture is quite limited and mainly to the north, so will confine
high pops to the immediate cascade crest, with chance pops for the
east cascade slopes, and slight chance pops for the eastern
mountains. Most lower elevation locations will remain dry. The main
concern with this system will be the wind. Tightening surface
pressure gradients and increasing mid level winds will yield breezy
to windy conditions for the cascade gap locations. Winds will remain
below advisory criteria. Highs Saturday will be a few degrees cooler
than today, with readings mainly in the lower mid 60s for the lower
elevations and upper 40s to lower 50s for the mountains.

Dry zonal flow will prevail Saturday night, with another weak short
wave progged to dig across the interior pacific northwest Sunday.

With very little moisture to work with, dry conditions can be
expected. Cooler temperatures will work in behind the cold front,
with lows Saturday night in the 30s for the lower elevations, with
near freezing temperatures possible for the higher foothill
locations. Highs Sunday will be similar to Saturday. The trough will
exit to the east Sunday night, with ridging building back into the
region for Monday. Rather chilly temperatures will be possible
Sunday night, with the latest ECMWF depicting a freeze for the
lowest elevations. With the blend of models still in the mid upper
30s and having better run to run continuity than the ecmwf
operational model, will stay closer to the blend. Temperatures will
begin a warming trend Monday with highs in the upper 60s to lower
70s for the lower elevations.

Long term... Monday night through Friday night... A strong mid-upper
level ridge of high pressure will persist over pacific northwest
through Thursday afternoon. During the day on Thursday, a large mid-
upper level trough will be near 132w off the northern california
coast and will begin transporting a moisture plume inland Thursday
night and thus introduce a slight chance of rain showers over higher
terrain in central oregon. The trough then becomes negatively tilted
during the day on Friday and moves into SW oregon by Friday
afternoon for a chance of rain showers in the higher mountains of
central oregon Friday afternoon and a slight chance of showers
elsewhere lower terrain in central oregon and in north central
oregon as well as in the southern blue mountains in the afternoon.

Friday the negatively tilted, mid-upper level trough swings into the
forecast area thus bringing dynamic lift for a chance of showers
spreading northward into the lower columbia basin Friday evening.

Models show an unstable atmosphere in central oregon on Friday,
which suggests the potential for thunderstorm activity in central
and east central oregon and in the blue mountains during the day on
Friday and into Friday evening as well. Polan

Preliminary point temps pops
Pdt 46 60 32 61 10 0 0 0
alw 48 62 34 63 10 10 0 0
psc 50 65 35 65 10 0 0 0
ykm 46 61 34 63 10 0 0 0
hri 48 64 34 64 10 0 0 0
eln 42 55 31 60 20 10 0 0
rdm 37 61 26 61 10 0 0 0
lgd 44 58 30 59 10 10 0 0
gcd 42 59 31 62 10 0 0 0
dls 48 62 37 67 10 10 0 0

Pdt watches warnings advisories
Or... None.

Wa... None.

91 91 91

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yakima Air Terminal - McAllister Field, WA3 mi41 minSW 510.00 miMostly Cloudy59°F27°F29%1018.5 hPa

Wind History from YKM (wind in knots)
Last 24hrS3CalmCalmW5W5W4W7NW4CalmNE4S6S6S7SE54SE8E4SE5CalmSW3W7W7W6SW5
1 day agoW4W6W8W7W6W5W6W5N7N4N453W7456W6W10N7N7N4N5N7
2 days agoW6W6W7W5W5W4SW3W4NW7W543SE73NE9CalmE74E9

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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Wind Forecast for Pendleton, OR (3,6,7,8)
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Ground Weather Radar Station Pendleton, OR
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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 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 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.