Tuesday, December7, 2021
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Marine Weather and Tides
Oroville, WA

Version 3.4
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3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 7:38AMSunset 4:01PM Tuesday December 7, 2021 4:18 PM PST (00:18 UTC) Moonrise 12:25PMMoonset 8:48PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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 Oroville, WA
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location: 48.94, -119.44     debug


Area Discussion for - Spokane, WA
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FXUS66 KOTX 072343 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 343 PM PST Tue Dec 7 2021

SYNOPSIS. Today will be a cloudy and seasonably cool day with afternoon temperatures in the 30s. A vigorous storm system will produce locally heavy snow over the Cascade crest and in the Idaho Panhandle, as we as gusty winds across the Columbia Basin, Palouse, and West Plains on Wednesday. Snow showers will continue over the Cascades and in the Idaho Panhandle through Thursday night. A stronger storm system over the weekend will produce heavy mountain snow, snow transitioning to rain in the valleys, and windy conditions.


DISCUSSION.

Tonight through Wednesday night: The next winter weather system will impact the region over the next 24 hours bringing another round of light wintry precipitation, strong winds, and heavy snow to our Cascade Passes. Let's start with tonight. Tonight, the main focus will be a mix of light wintry mix of snow, freezing rain/drizzle, and rain. Temperatures are running 4-6 degrees warmer than this time yesterday and many communities across the Columbia Basin, lower Idaho Panhandle, and Wenatchee Area are sitting above freezing. Freezing temperatures remain in place along and north of the Highway 2 corridor. Another feature of note are the widespread clouds plugging nearly all of the lowlands of Eastern WA and N ID. These clouds combined with increasing southerly flow along a warm front lifting the region will not allow our temperatures to cool much overnight and likely even rise 1-4 degrees as the night progresses. The incoming warm front will also bring increasing lift and we anticipate light precipitation to expand across our northern mountain zones, Eastern third of WA, and Idaho Panhandle. Areas of NE WA and N ID where precipitation is expected to be steadiest and vary from snow to freezing rain has been put into a winter weather advisory given the potential for slick travel conditions. I think we will see mainly snow closer to the Canadian Border and potential for rain reaching Deer Park and Rathdrum so areas in between could be a mess of wintry precipitation. Westerly flow coming off the Cascades will limit precipitation potential in the lee of the Cascades so despite freezing temperatures still lingering in Methow Valley, Okanogan Valley, and Okanogan Highlands . I expect very little precipitation to impact these locations. Motorists should also be cautious of for areas of black ice and dense fog this evening and overnight before warmer temperatures arrive in any particular location.

A cold front will sweep through the region Wednesday morning shifting our focus over to wind and mountain snow showers. Winds will be the most impactful weather phenomenon across the Inland NW impacting just above everyone except the far northern sheltered valleys. West to southwest winds will ramp up from the East Slopes of the Cascades . across the Columbia Basin . and blow into the Cd'A Area, Palouse, and Central Panhandle Mountains through much of Wednesday morning and afternoon. Sustained winds for a few hours will approach 20-25 mph with gusts 35-45 mph. Lakes will be rough and light weight objects will likely become airborne. Those traveling on north to south routes across the basin could encounter strong cross winds, especially if in a high profile vehicle. Other impacts include isolated tree damage and power outages; these typically occur near weakened trees given that we see these wind speeds several times a year.

The strong winds will bring a strong rain shadow across Eastern Washington. This will result in increasing sunshine, better mixing, warmer temperatures. The main threat for showers will retreat to the Cascade Crest and Idaho Panhandle. These will be mainly in the form of snow for elevations above 3000-4000 feet bringing travel impacts to our mountain passes. Stevens and Snoqualmie Passes could be hit especially hard as a Puget Sound Convergence Zone sets up leading to high snowfall rates. Over a foot of snow will be possible along the crest. Lookout Pass will experience lighter amounts, generally under 6 inches which could still bring winter driving conditions.

On Thursday, a cold upper-level trough will swing through the region knocking temperatures back into the lower 30s and bringing widely scattered snow showers to the Idaho Panhandle and continued threat for the Cascade Crest. Strong cooling aloft under a -36C 500 mb cold pool will lead to steep lapse rates and clusters of convective showers. This pattern has a history of producing locally high snowfall amounts for portions of the Idaho Panhandle and it is conceivable that more winter highlights will be issued in the coming days to address these concerns. A few of these snow showers will likely expand westward into the eastern reaches of WA at times as well. Little to no showers or impacts are expected for Central WA away from the crest. Temperatures will cool rapidly Thursday night and showers will wane. Any moisture will likely refreeze with temperatures dipping back into the teens and twenties. Winter has finally arrived! /sb

Friday through Monday: Friday will be our break between two systems as an upper level low amplifies in the Gulf of Alaska. It will be a cloudy day with light precipitation lingering in the Cascades and ID Panhandle. Most of the Inland NW will remain mostly cloudy with near normal temperatures to wrap up the work week.

Overnight Friday through the weekend, a trough will dig into the Pacific NW coastline bringing moisture and southerly winds into the region. This system will be accompanied by significant precipitaiton - likely winter weather warning worthy, especially in the Cascades and ID Panhandle. Moderate to high 6 hour snowfall rates in the mountain passes will have an impact on road conditions and travel. There will be fluctuating snow levels. They rise Saturday which will bring a mixed precipitation to the northern valleys and parts of the area south of HWY 2 throughout the weekend. In addition to the snow and rain, there will be strong southerly winds Saturday afternoon through late Sunday morning as the pressure gradients tighten. Peak wind gusts will be late Saturday and overnight with the potential for gusts to reach 35-50 KTS (and even stronger). However, models are in agreement of timing and location of strongest winds, but not in sustained and gust speeds. The Euro and GFS ensembles are forecasting the strongest, between 21Z Sat - 12Z Sun, in the West Plains, Basin, and northern ID Panhandle. These winds would meet wind advisory criteria. We will continue to evaluate these winds closer as we approach the weekend and certainty grows.

As the back edge of the system and cold front passes early Sunday, temperatures will cool with breezy, but weaker winds. Active weather will continue throughout the remainder of the weekend and starting the week. JS

AVIATION. 00Z TAFs: Low stratus has become established across terminals in E WA and N ID this afternoon bringing a mix of LIFR to MVFR conditions. A frontal system passing through tonight and Wednesday will bring incr pcpn chances this evening and especially after 06z. A wintry mix is expected. Pcpn type expected as rain for Pullman and Lewiston . snow for Sandpoint and Colville and light wintry mix in between around Deer Park, Cd'A, and Spokane. Little to no pcpn is expected around Omak, Wenatchee, and Moses Lake given westerly flow and a strong rain shadow. Strong winds move into the region after 10z bringing several hours of potential LLWS then gusts 25-35kts. The winds look to scour out the stratus leading to moderate confidence for rapid improvement and return to VFR skies between 17-20Z. /sb


PRELIMINARY POINT TEMPS/POPS. Spokane 32 41 24 34 22 34 / 30 30 0 20 10 0 Coeur d'Alene 32 40 24 33 23 33 / 50 70 0 20 20 20 Pullman 33 41 25 34 24 35 / 50 60 10 20 40 10 Lewiston 40 49 32 41 30 42 / 30 40 0 20 30 0 Colville 28 40 18 33 15 31 / 30 30 0 10 10 0 Sandpoint 28 38 24 31 22 31 / 70 90 10 30 20 30 Kellogg 30 39 25 31 24 32 / 80 90 30 70 50 40 Moses Lake 34 46 25 40 22 39 / 10 10 0 0 0 0 Wenatchee 32 43 28 40 27 39 / 10 10 10 20 10 10 Omak 30 43 23 37 22 36 / 20 10 0 0 0 0

OTX WATCHES/WARNINGS/ADVISORIES. ID . Winter Weather Advisory from midnight tonight to 7 AM PST Wednesday for Northern Panhandle.

WA . Winter Weather Advisory from midnight tonight to 7 AM PST Wednesday for Northeast Mountains.

Winter Storm Warning from 4 AM Wednesday to 10 AM PST Thursday for Western Chelan County.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Omak Airport, WA33 mi25 minSSW 510.00 miOvercast32°F27°F82%1017.4 hPa

Link to 5 minute data for KOMK

Wind History from OMK (wind in knots)
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This dayN8N8N5N5N300N3N4NE3N4N4N30000000SE3S4S6S5
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2 days agoN4NW4N4N6N7N8NW10N3N7N12N8NW6W8NW6N7NW9N11N12N9N14
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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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