Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Spokane Valley, WA

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:29AMSunset 7:17PM Wednesday March 29, 2017 4:07 AM PDT (11:07 UTC) Moonrise 7:44AMMoonset 9:28PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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
    EDIT      (on/off)   Help
7 Day Forecast for Marine Location Near Spokane Valley, WA
   Hourly   EDIT   Help
location: 47.64, -117.19     debug


Area Discussion for - Spokane, WA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kotx 290946
afdotx
area forecast discussion
national weather service spokane wa
246 am pdt Wed mar 29 2017

Synopsis
A moist frontal system will bring more rain to the inland
northwest today. This round of rain will aggravate ongoing field
flooding and heighten the potential for rock slides in areas with
steep terrain. A rare dry day is expected on Friday. The weekend
and early next week will feature average temperatures and scattered
light showers over the mountains.

Discussion
Rain today and tonight will aggravate field flooding and rock
slide potential...

today and tonight: the idaho panhandle can expect a half inch to
three quarters of an inch of rain by late tonight. Pend orielle
and stevens counties will have a good shot at comparable amounts
today and tonight. The west plains, spokane area, and the
washington palouse will likely get a quarter to half inch. These
areas have been soaked repeatedly this month. More rain will only
aggravate ongoing issues with field flooding in areas with poor
drainage. Small streams will respond once again and steep slopes
will see a heightened risk of rock and mud slides. A flood watch
is in effect for counties of the idaho panhandle from the canadian
border to as far south as lewis and nez perce counties. Stevens,
pend orielle, and northern spokane counties are also included in
the flood watch along with asotin county (to capture flooding
along the grande ronde river).

A plume of subtropical moisture will spread over the inland
northwest this morning. Our most widespread rains from central
washington through the id panhandle will occur early this morning
as a surface low moves over the olympic peninsula. Broad
warm/moist advection will produce several hours of steady light to
moderate rain over much of the inland northwest this morning. By
mid to late morning, mid-level westerly flow should initiate the
rain shadow in the lee of the cascades. Places like wenatchee,
moses lake, waterville, and omak should experience a break in the
persistent rain and may have some peaks of Sun this afternoon.

Look for snow levels to be on the rise today with the passage of
the warm front. Early morning snow levels in the 4000-5000ft range
are expected to climb to 6000ft by afternoon and evening. Area
ski resorts should see some accumulation early in the day before a
rain/snow mix comes by afternoon.

Thursday: a cool upper level trough is forecast to buckle over
the northwest on Thursday as the polar jet digs into the great
basin. There is general agreement between the gfs, ecmwf, and nam
that a band of wrap around precipitation (deformation band) will
develop eastern oregon and southwest idaho Thursday morning. This
band will be monitored closely. Snow levels will likely be falling
under the heart of this precipitation band and could produce wet
accumulations as low as 3500 feet over the camas prairie and blue
mountains Thursday morning. Places like peola, anatone,
winchester, and craigmont could have as much as 2 to 4 inches of
accumulation on grassy surfaces early in the day if this band sets
up just right. For now, our forecast has snow levels as low as
4000 feet Thursday morning with accumulations of 1 to 2 inches,
but these amounts could go up or down depending on the track of
this system and snow levels. /gkoch
Thursday night through Sunday night: this could possibly be the
driest part of the week. By Thursday evening, the upper level
trough digs south and east and pulling out of the region, as a
ridge of high pressure builds in from the west. Northerly low
level winds increase down the okanogan valley into the western
basin with drier continental air. Meanwhile sheltered locations
may still hold onto the low boundary layer moisture, as in the
valleys of northeast washington and north idaho and leads to the
development of fog and stratus. Dry weather will prevail over the
region for Friday and Friday night with filtered sunshine as high
level clouds increase and temperatures remain near seasonal
normals. On Saturday, the strength of the high pressure ridge is
tested as a weakening cold front blows through the region.

Precipitation chances look limited and affects mainly the
mountains. The medium range models indicate the remains of the
frontal boundary gets stalled over southeast washington into the
southern panhandle while a weak upper level shortwave ripples into
the region. This looks to enhance the boundary and increase the
instability with more showers possible not only for the higher
terrain by also near the boundary itself. Breezy westerly winds
are expected to develop from the lee side valleys into the
columbia basin Sunday afternoon and evening. Temperatures will
continue to follow seasonal trends, with the mildest days of the
week being Friday into Saturday. /rfox.

Monday through Wednesday: the beginning of next brings another
brief period of shortwave ridging building in by late Monday.

Showers will linger over the eastern zones, especially the idaho
panhandle during the day on Monday before dry air moves in and
gives us a break from precipitation late Monday into Tuesday.

Models are in quite good agreement on then yet another wet system
moving in by mid week associated with the upper low over the gulf
of alaska. Snow levels will be on the increase with even higher
elevations potentially changing over to rain. With yet another
moist frontal system moving through this will warrant keeping an
eye on for potential hydro issues late week. /bwilliams

Aviation
06z tafs: moist westerly flow will lead to rain for the TAF sites
tonight into Wednesday. Downslope flow off the cascades into
central washington as well as off the blue mountains into the
lewiston area should keep prevailing cigsVFR for these areas while
a moistening boundary layer over eastern washington and north
idaho will lead to lowering CIGS with MVFR conditions becoming
prevalent overnight into Wednesday. Steady rain may begin to
diminish over NE wa/n idaho Wednesday afternoon but a very moist
boundary layer combined with low level upslope flow will yield an
abundance of stratus... With forecast soundings from the GFS and
nam indicating a good chance for ifr conditions at kgeg. Jw

Preliminary point temps/pops
Spokane 49 37 51 34 54 35 / 100 60 30 10 0 0
coeur d'alene 47 38 49 33 53 35 / 100 90 40 10 0 0
pullman 49 40 49 32 52 36 / 100 90 40 20 0 0
lewiston 54 43 54 37 56 38 / 100 70 50 10 0 0
colville 49 36 53 33 53 36 / 100 50 30 10 0 0
sandpoint 44 38 48 32 50 33 / 100 90 40 10 0 0
kellogg 46 37 46 31 50 34 / 100 100 50 30 10 10
moses lake 56 38 60 33 59 39 / 60 20 10 0 0 0
wenatchee 54 38 55 35 57 38 / 50 10 10 0 0 0
omak 51 36 55 31 57 36 / 70 20 10 0 0 0

Otx watches/warnings/advisories
Id... Flood watch from 5 am pdt early this morning through Friday
morning for central panhandle mountains-coeur d'alene area-
idaho palouse-lewis and southern nez perce counties-
lewiston area-northern panhandle.

Wa... Flood watch from 5 am pdt early this morning through Friday
morning for lower garfield and asotin counties-northeast
blue mountains-northeast mountains-spokane area.



Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Spokane, Felts Field, WA7 mi15 minSE 410.00 miOvercast45°F37°F77%1019.6 hPa
Spokane, Spokane International Airport, WA18 mi15 minSSE 710.00 miLight Rain41°F37°F86%1019.5 hPa
Coeur d'Alene Airport - Pappy Boyington Field, ID22 mi12 minSSW 310.00 miOvercast40°F37°F93%1022.3 hPa
Fairchild Air Force Base, WA24 mi70 minSSE 510.00 miLight Drizzle40°F39°F100%1020.3 hPa

Wind History from SFF (wind in knots)
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last 24hr3S6S3SW35SW9
G14
SW10S12S8
G17
S12SW9SW10SW10SW7SW4S5SW56CalmE6E4NE3NE3SE4
1 day agoCalmCalmCalmW5W3SW7SW11W9
G18
SW9W6--SW13
G18
SW18
G25
S7NW10
G17
3N4N4NE3CalmCalmSE3S76
2 days agoNE3NE4CalmNE3CalmCalmE8E75E7SE7SW8SW6CalmCalmS3SE4CalmCalmNE3NE3NE4NE3Calm

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Spokane, WA (7,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Spokane, WA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.