Tuesday, May21, 2019 L-36.com


Marine Weather and Tides
Spokane Valley, WA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:02AMSunset 8:28PM Tuesday May 21, 2019 4:10 PM PDT (23:10 UTC) Moonrise 11:30PMMoonset 7:21AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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 Spokane Valley, WA
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location: 47.64, -117.19     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 212136
afdotx
area forecast discussion
national weather service spokane wa
236 pm pdt Tue may 21 2019

Synopsis
Temperatures will warm up this week with highs into the 70s by
Thursday. Conditions will be generally dry through Wednesday.

An approaching disturbance may trigger some showers and even
a thunderstorm over north-central washington on Thursday. By
Friday this disturbance will take up residence over western
washington resulting in a good chance of showers and afternoon
thunderstorms for most of the inland northwest. The disturbance
will drop south of the area for the holiday weekend with a
chance of showers mainly for Saturday.

Discussion
Tonight through Thursday: a weak shortwave disturbance is
rotating counter-clockwise across the southern id panhandle into
southeast wa this afternoon. Scattered showers will form ahead of
this wave with isolated thunderstorms also possible into the late
afternoon hours. Showers are expected to move south of the region
by midnight.

A northerly pressure gradient will strengthen overnight into
Wednesday morning. The gradient will be strongest over the
northern id panhandle with 25-35 mph wind gusts expected through
the purcell trench by Wednesday morning. Winds will spread out
over the basin with gust to around 25 mph possible. We have had a
few dry days in the basin, but I still think soils are a bit too
moist still for a concern for blowing dust.

Models do show some instability up along the spine of the cascades
Wednesday afternoon. I left a small potential for thunderstorms,
but a better potential will come for Thursday afternoon with all
models indicating some potential for developing showers and
thunderstorms. Best chances for thunderstorms on Thursday will
again be up near the cascade crest. Steering flow will be light
from the west, which will push storms eastward into places like
mazama, winthrop, stehekin, plain and leavenworth. Heavy rain with
slow moving thunderstorms will be a potential concern for flooding
impacts. The main concern will be if any thunderstorms track
across a recent burn scar, in which case flash flooding will be a
possibility. Svh
Thursday night through Tuesday... The overall field of motion
through much of the extended forecast period... Including the
upcoming holiday weekend... Will feature a split flow regime over
the western us with an upper low circulation generally to the south
of the region over coastal california and the great basin with
the northwestern us under somewhat moist south or southeasterly
return flow around the northern flank of this closed low. This
will create a showery regime at times with a chance of
thunderstorms especially on Friday and to a lesser extent but
still noticeable on Saturday afternoon and evening. Sunday and
Monday a threat of showers and afternoon early evening
thunderstorms will be more confined to the far southeastern zones
and by Tuesday it looks like a drier northerly flow develops over
the area as the great basin low ejects into the central us.

Friday looks like the day of most impactful weather across the
region. Models are in good agreement in transiting a deepening
upper low down the west side of the state on it's way to take
station in the great basin for the rest of the holiday weekend.

This track will place the forecast area under diffluent moist
southerly flow on Friday with models depicting significant
instability during the afternoon and evening hours as well as
precipitable water values on the order of 3 4 of an inch or
higher. All of these ingredients suggest a very real threat of
scattered rain showers developing in the morning culminating in
afternoon and evening scattered thunderstorms salted among
numerous rain showers. Just about any location in the forecast area
will be subject to a shower or thunderstorm on Friday but the
axis of higher threat will probably be over the mountains ringing
the basin. Given the weak steering flow and heavy moisture
availability some of these storms could contain heavy localized
downpours. It's too early to get a good handle on this threat at
this time... But confidence is increasing that Friday will be the
most active and potentially wet day of the extended forecast.

Saturday and Sunday the area will continue to be subject to moist
deformation bands but the parent closed low will be farther away
and shower and thunderstorm activity will probably be
sparser... But still present especially over the mountains ringing
the basin. By Monday residual activity will probably be confined
to the far southeastern zones and idaho panhandle with some
isolated showers and possible thunderstorms in the cascades. For
outdoor activities this upcoming holiday weekend Saturday looks
like the most active day for much of the region... While Sunday and
Monday will feature a smaller threat of showers and thunderstorms.

Temperatures during the entire extended period will probably
run close to normal for this time of year. Fugazzi

Aviation
18z tafs: a low pressure system sits on the or west coast with a
deformation band extended out across the wa or border. Stratiform
rain will fall beneath this band and westerly winds is advecting
moisture into kpuw with ifr CIGS expected this morning. CIGS will
lift with building cumulus in the afternoon. The building cumulus
will result in a shower and low chance thunderstorm threat for
klws and kpuw after 21z. All other TAF sites will be free of
precip withVFR conditions. North to northeast winds will
increase overnight and into Wednesday morning with gusts of 20-30
kts possible, especially at kcoe and kmwh. Svh

Preliminary point temps pops
Spokane 48 70 47 74 50 68 10 0 0 0 10 50
coeur d'alene 47 69 46 74 49 67 10 0 0 0 10 60
pullman 43 67 44 72 48 66 20 0 0 0 0 50
lewiston 49 73 50 77 54 73 20 0 0 0 10 60
colville 45 77 41 82 43 75 10 0 0 0 10 60
sandpoint 53 68 47 73 48 67 0 0 0 0 10 60
kellogg 47 65 46 70 50 65 10 0 0 0 10 60
moses lake 51 77 51 82 53 75 10 0 0 0 0 40
wenatchee 53 74 55 79 56 72 10 0 0 10 10 50
omak 55 75 51 79 53 72 0 10 10 10 10 70

Otx watches warnings advisories
Id... None.

Wa... None.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Spokane, Felts Field, WA7 mi2.3 hrsVar 510.00 miOvercast65°F37°F37%1003.6 hPa
Spokane, Spokane International Airport, WA18 mi2.3 hrsVar 510.00 miMostly Cloudy64°F36°F35%1003.9 hPa
Coeur d'Alene Airport - Pappy Boyington Field, ID22 mi2.2 hrsNNE 1310.00 miPartly Cloudy65°F37°F37%1005.1 hPa
Fairchild Air Force Base, WA24 mi2.2 hrsN 610.00 miOvercast62°F37°F41%1004.6 hPa

Wind History from SFF (wind in knots)
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Last 24hrE10NE10NE12
G17
NE9NE7
G17
NE7NE5E9E5CalmCalmCalmCalmCalmCalmCalmCalmCalmW33NE5N5NE65
1 day agoNE10
G21
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G25
NE13
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NE12
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NE8
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NE7NE7NE6NE10E5CalmCalmCalmCalmCalmE9
G18
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G14
5E6NE7
2 days ago--E8E9E11NE9NE8NE7E4CalmNE7E11NE6NE9
G17
NE85NE7NE12
G17
NE12
G21
NE10
G21
E16
G21
E11
G23
NE8
G19
NE9
G20
NE5
G23

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 (19,4,5,8)
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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.