Wednesday, April25, 2018

Marine Weather and Tides
Lewiston, ID

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 5:39AMSunset 7:51PM Wednesday April 25, 2018 11:03 AM PDT (18:03 UTC) Moonrise 3:04PMMoonset 4:02AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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 Lewiston, ID
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location: 46.39, -116.98     debug

Area Discussion for - Spokane, WA
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Fxus66 kotx 251703
area forecast discussion
national weather service spokane wa
1003 am pdt Wed apr 25 2018

The warming trend continues with afternoon temperatures well into
the 70s today. Many lowland places will exceed 80 degrees
Thursday and especially on Friday. Expect a pattern change to bring
cooler temperatures and the threat for showers this weekend into
early next week.

Today through Friday: dry and unseasonably warm weather continues
for the rest of the work week with a ridge of high pressure over
the region. Anticipate subtle changes each period. A weak
shortwave will pass across bc this morning, dragging a band of
cirrus through the region, followed by drier air in its wake.

Skies will start off partly sunny, but should clear through the
day. Surface winds will become northerly and should be the most
pronounced in the okanogan valley into the western columbia basin
this afternoon as a surface area of high pressure settles into bc.

Tonight into Thursday, the surface high spreads across the
canadian rockies into western mt, which enhances easterly flow
across the inland nw. A low level thermally induced pressure
trough remains across western oregon and builds into washington.

By Thursday night into Friday, the ridge of high pressure begins
to shift east as low pressure in the pacific pivots inland across
oregon. A band of high level moisture will sweep across oregon
into southern washington as the low level pressure trough marches
eastward. The warmest day look to be Friday across the inland nw
with MAX warm air advection and low level thermal ridge spanning
the region. Could see afternoon temperatures reaching the 80
degree mark in several locations. Meanwhile, instability and
moisture mounts across southeast washington into the southern
panhandle with the advancing pressure trough Friday afternoon.

There looks to be a small chance of showers and thunderstorms over
the blue mountains late that day, although a strong cap will need
to be released for this activity to develop. Rfox.

Friday afternoon and Saturday: the ridge that has been in place
for most of week will begin to shift east as an upper level trof
begins to press into the region. A low associated with this trof
will move onshore along the or ca border by late Friday afternoon.

Models are in good agreement with the the initial arrival of this
system. Euro and UKMET are running slightly slower than GFS by a
run. The late in the day impacts will allow Friday to still be the
significantly warmer than normal with 850mb temps in the mid 50s
range and sfc temps pushing 80. The first impacts from the low
will be showers developing in SE wa region. Models indicate around
800 j kg of CAPE in the that area but extremely high CIN might
hinder any development of thunderstorms outside of the slight
chance in extreme SE wa along the or border. By late Friday
night early Saturday, the entire region is under the influence of
the low. The models begin to differ on the strength of the low
and the ridge by mid morning Saturday. This is lowering confidence
on the trajectory and timing of the low exiting the region. This
leads to forecast of widespread rainshowers with cloud cover
keeping the temperatures around 15 degrees cooler than Friday.

Snowmelt due to warm temps are expected to cause rises for the
regions streams and rivers causing some to reach minor flood or
action stage on Saturday.

Sunday through Wednesday: the low is still trudging through the
pacific northwest widespread rainshowers to the inland northwest.

With the low passing to the south, the wrap around moisture will
bring likely showers to the id panhandle with the rest of the
region expecting chance showers. Continuous cloudy sky will help
bring a drop in temperatures for the beginning of the week with
highs reaching only into the 50s to low 60s for most. Temperatures
will begin to rebound by midweek. Rivers and streams are expected
to begin to lower during this period. Jdc

18z tafs: dry northerly flow behind this morning's frontal
boundary will deliver generally clear skies through 18z thur.

Winds will be light form the northwest today... Becoming easterly
overnight. Local speeds of 10-15 mph possible around kcoe and
kpuw. Sb

Preliminary point temps pops
Spokane 74 45 78 49 80 48 0 0 0 0 0 20
coeur d'alene 72 42 77 46 80 47 0 0 0 0 0 20
pullman 72 43 78 46 80 46 0 0 0 0 0 40
lewiston 79 46 83 50 84 52 0 0 0 0 0 40
colville 75 42 79 44 82 49 0 0 0 0 0 10
sandpoint 70 39 73 42 78 46 0 0 0 0 0 10
kellogg 70 39 74 43 79 47 0 0 0 0 0 10
moses lake 78 43 82 47 84 50 0 0 0 0 0 30
wenatchee 76 49 80 52 81 50 0 0 0 0 0 30
omak 77 43 81 49 84 52 0 0 0 0 0 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
Lewiston, Lewiston-Nez Perce County Airport, ID2 mi67 minVar 310.00 miFair60°F42°F52%1019.6 hPa

Wind History from LWS (wind in knots)
Last 24hrE6E8SE43NE8
1 day ago3Calm5NW6NE6N6E7NE6NE4W4W4S5CalmS4SE4S4E4NE73S4SE5S53NE3
2 days agoNW7NW10NW103W13

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 Spokane, WA (14,3,4,5)
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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 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.