Sunday, April18, 2021
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Marine Weather and Tides
Clark Fork, ID

Version 3.4
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1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 5:49AMSunset 7:43PM Sunday April 18, 2021 1:54 PM PDT (20:54 UTC) Moonrise 9:35AMMoonset 1:35AM Illumination 43% Phase: First Quarter Moon; Moon at 7 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 Clark Fork, ID
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Area Discussion for - Spokane, WA
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FXUS66 KOTX 181742 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 1042 AM PDT Sun Apr 18 2021

SYNOPSIS. Warm and dry weather will continue through mid-day Sunday for the Inland Northwest. High temperatures Sunday will be well into the 70s, with low to mid 80s expected across central Washington. A robust cold front is expected to pass through the region Sunday afternoon and into Monday. This front will be accompanied by strong north to northeast winds, as well as a small chance of showers and even a thunderstorm. Much cooler temperatures will move in behind the front for Monday.

DISCUSSION. Sunday and Monday: Spokane's first 70F+ day was Saturday, with a final temperature reading of 74F, some 17F+ above seasonal normal. Can't argue with that weather; it was a beautiful day outside. The start to Sunday and through mid-day will be just as nice, if not a few degrees warmer in places.

Deep mixing in a very dry boundary layer could be seen on the 00z KOTX sounding. Above 700mb northerly winds are already filtering in, helping to shift the ridge to the south. Our cold front is still on schedule to slide south this afternoon through northern Idaho early afternoon, reaching Coeur d'Alene - Spokane around 5pm or so and pressing on to the southwest through the Columbia Basin through the evening hours. The wind will be an abrupt shift out of the northeast with the frontal passage. Moving through Bonners Ferry to Sandpoint, from Colville to Deer Park in a matter of 1-2 hours and then picking up momentum and wind speed strength through the evening hours as it traverses through the Columbia Basin.

The wind speed forecast hasn't changed much with the latest set of model guidance and confidence continues to grow with the timing of the front and strength. A wind advisory was issued for many locations that will likely see wind gusts in excess of 40-45 mph through the Sunday evening time period. The cold advection is quite impressive as the front pushes through. 850mb temperatures around +14C dropping to +3C in just a matter of about 3 hours; it's no wonder the winds will push through in a rush.

The instability associated with the front has increased slightly, expanding from Republic to Bonners Ferry, to Coeur d'Alene and through the Central Idaho Panhandle. Isolated to scattered thunderstorms will be possible as the front moves through.

By late afternoon into the evening hours, the winds will pick up through the Columbia Basin and produce blowing dust/haze as the front moves southwest. After midnight Monday morning, the peak winds will be well to our southwest and we'll be left with light to breezy northeast winds and a cooler airmass starting Monday. /Dewey

Tuesday through Saturday: Ridge axis retrogrades offshore which provides a dry northerly flow of air void of shortwaves into Eastern Washington and North Idaho into Wednesday. Generally clear skies coupled with a gradual warming trend peaking Wednesday remain in place with temperatures not as warm as this weekend. The offshore ridge weakens after Wednesday. This allows for the the possibility of weather disturbances not only dropping down from the north as early as Thursday and again Friday but also from the west Saturday. With timing differences this far out pops show a gradual increase peaking over the weekend with a persistent rain shadow of varying size over the Columbia Basin and nearby lowlands at times along with with considerable cloud cover increase. In addition forecast temperatures show a decrease and winds show an increase /Pelatti

AVIATION. 18Z TAFS: A cold front approaching from the northeast will increase winds today from 21Z onward. Blowing dust or haze is possible over the basin with reduced visibilities (GEG/MWH). The strongest winds will come after 00Z with gusts near 30-40 kts. There will also be a threat of showers and thunderstorms near COE,PUW,GEG,SFF but the risk is slight. Any thunderstorms could produce higher gusts. Gusty winds will continue through the overnight hours decreasing in speeds after 09Z, with the potential for showers ending after 09Z as well. /KD

PRELIMINARY POINT TEMPS/POPS. Spokane 75 34 59 34 64 36 / 10 20 0 0 0 0 Coeur d'Alene 69 32 57 31 62 33 / 30 40 0 0 0 0 Pullman 73 34 57 33 62 35 / 0 10 0 0 0 0 Lewiston 78 42 64 36 68 39 / 0 10 0 0 0 0 Colville 75 32 62 32 67 35 / 20 20 0 0 0 0 Sandpoint 63 34 56 31 60 33 / 50 60 0 0 0 0 Kellogg 66 32 52 33 58 36 / 40 70 0 0 0 0 Moses Lake 80 40 66 36 70 39 / 0 0 0 0 0 0 Wenatchee 83 44 64 41 67 43 / 0 10 0 0 0 0 Omak 80 42 66 38 70 41 / 10 10 0 0 0 0

OTX WATCHES/WARNINGS/ADVISORIES. ID . Wind Advisory from 6 PM this evening to 2 AM PDT Monday for Coeur d'Alene Area.

Wind Advisory from 4 PM this afternoon to 11 PM PDT this evening for Northern Panhandle.

WA . Wind Advisory from 3 PM this afternoon to 11 PM PDT this evening for Okanogan Valley-Waterville Plateau.

Wind Advisory from 6 PM this evening to 2 AM PDT Monday for Moses Lake Area-Spokane Area-Upper Columbia Basin- Washington Palouse.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sandpoint, Sandpoint Airport, ID30 mi59 minS 910.00 miFair70°F32°F25%1017.3 hPa

Link to 5 minute data for KSZT

Wind History from SZT (wind in knots)
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Last 24hrE6E7E4NE3N5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3NE3SE6S7
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1 day agoE7E6E6E5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3CalmE4NE4E8
2 days agoSE8E7E4SE5SE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm--CalmCalmCalmSE3SE6E6SE7E4

Tide / Current Tables for
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GEOS Local Image of PacificNorthwest    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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