Tuesday, March31, 2020
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Marine Weather and Tides
Clark Fork, ID

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:24AMSunset 7:17PM Tuesday March 31, 2020 9:27 AM PDT (16:27 UTC) Moonrise 10:23AMMoonset 1:54AM Illumination 51% 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 311301 AAA AFDOTX

Area Forecast Discussion . UPDATED National Weather Service Spokane WA 601 AM PDT Tue Mar 31 2020

SYNOPSIS. Expect snow showers to bring some lowland snow this morning, while scattered rain and snow showers return by afternoon with a small chance of thunderstorms and breezy winds. Active and cool weather continues through much of the week and into the weekend.

Quick update: Despite the radar showing an increase of snow showers, early morning temperatures ranged from 33 to 36 across extreme eastern WA into north Idaho, making it difficult for accumulating snow in the lowest elevations. Adjusted snow levels to near 2500 ft and tweaked diurnal temperatures, giving way to little to light snow in the lowest valleys. Bulk of the accumulating snow will be found in the higher valleys and mountains. Based on the shower activity lingering over the Camas Prairie through late morning. /rfox

Today: An upper level trough remains over the region with cold air aloft and minor impulses pivoting around the circulation. The atmosphere is quite unstable and the passage of these impulses can lead to enhanced showers. This makes a tricky forecast as it looks to be case for the morning hours as an impulse tracks across eastern Washington into north Idaho through the midday. The high resolution models indicate an increase in shower activity especially east of Spokane to Pullman into north Idaho. With snow levels at the surface, snow showers are a good bet with bursts of accumulating snow this morning. Have expanded the winter weather advisory over the central ID panhandle to include the lower elevations to Coeur d’Alene, Moscow and Sandpoint through late morning. The winter weather advisories for the Cascade crest and the Camas Prairie will also expire by late morning. By then, surface temperatures will warm and a rain snow mix can be anticipated in the valleys while more scattered snow showers will be found in the mountains. Surface based instability increases by afternoon with skinny cape values of 200 to 300 J/kg, which could lead to isolated thunderstorms with graupel or small hail with gusty winds across extreme eastern Washington into the Idaho Panhandle. Meanwhile, southerly winds will pickup out of the southwest to west by midday into the early evening under good mixing. Wind speeds won’t be as strong as yesterday although gusts to 25 mph are likely. Much of central Washington will remain in the rain shadow while afternoon temperatures reach the lower 50s, meanwhile temperatures remain cool over north Idaho, as they struggle to rise to the middle 40s.

Tonight through Thursday night: The upper level trough continues to influence the weather across the Inland Northwest through mid week. Scattered snow and rain showers persist, being diurnally driven peaking in the afternoon hours. Snow showers early Wednesday morning may bring a light dusting to the valleys of north Idaho. Another upper level impulse tracks into the region Wednesday afternoon as surface based instability increases across southeast Washington and the southern ID Panhandle with another threat of isolated thunderstorms. Meanwhile, a cold front lingers to the north in BC to NW Montana and presses toward the region. In central Washington, northerly winds begin to funnel down the Okanogan valley on Wednesday ushering in drier air that spills into the western Columbia Basin. Northeast winds pick up in the Purcell Trench Wednesday night into Thursday. Temperatures continue to cool a couple degrees on Wednesday and Wednesday night. By Thursday, the upper trough weakens and pushes east leaving a northwest flow aloft, yet sensible weather changes little. Temperatures moderate slightly. Dry conditions continue in central Washington while upslope showers chances return to extreme eastern Washington and north Idaho. /rfox.

Friday through Tuesday: Longwave trough of low pressure will remain over the Inland Northwest through the weekend into early next week. The longwave pattern is agreed upon well amongst the global model ensemble means. The good model agreement carries moderate to high confidence for cooler than normal temperatures and showery conditions. The atmosphere will be conditionally unstable under a cold upper level trough leading to a good chance for afternoon graupel showers. One key difference amongst the deterministic models is the placement of a closed low deepening at the base of the trof for Sunday into Monday. The 00Z GFS solution drags the upper level low across southern Washington. This is clearly an outlier. The solution does not garner much support from the GEFS and the 00Z ECMWF and Canadian solutions dig the low much further south into California. The Canadian solution is much deeper and furthest south with this closed low, so the ECMWF solution is the leading candidate for verifying amongst the deterministic guidance. The general blend of model guidance looks reasonable for the extended as it's tough to buy in on any one solution at this point. I did trend temperatures a little cooler for early next week and nudged toward the ECMWF ensemble mean for high temperatures. I also added patchy fog in the mountain valleys of northeast Washington and into the Idaho Panhandle for Friday and Saturday mornings. /SVH

AVIATION . 12Z TAFS: A cold upper trough will persist over the region through the period, leading to isolated to scattered rain and snow showers. This morning a weak impulse will ripple through the region and generate showers with MVFR conditions. Local IFR conditions are possible with heavier showers especially east of KGEG to KPUW with light snow accumulations By afternoon, surface based instability will increase with a resurgence of shower activity. There is a slight chance thunderstorms this afternoon across the eastern third of WA into north Idaho, but confidence is low if they will impact a TAF site. Rain shadow conditions will prevail from KEAT to KMWH with VFR conditions. Gusty westerly winds will develop especially from KEAT to KMWH and KGEG to KPUW. Winds and showers will taper off this evening giving way to VFR conditions. /rfox.

PRELIMINARY POINT TEMPS/POPS. Spokane 46 28 43 26 44 27 / 90 30 60 30 30 20 Coeur d'Alene 44 28 42 25 42 26 / 90 30 60 20 30 10 Pullman 43 28 41 26 41 28 / 70 40 70 20 40 10 Lewiston 50 34 47 31 48 31 / 40 30 60 20 30 10 Colville 50 26 47 24 48 25 / 50 20 30 20 10 20 Sandpoint 42 28 39 24 39 26 / 90 50 70 40 40 20 Kellogg 39 28 38 25 39 26 / 90 60 90 40 60 20 Moses Lake 55 32 53 28 52 29 / 20 10 20 10 10 10 Wenatchee 52 32 49 29 49 31 / 10 10 30 10 10 10 Omak 54 29 49 26 49 28 / 10 10 20 10 10 10

OTX WATCHES/WARNINGS/ADVISORIES. ID . Winter Weather Advisory until 11 AM PDT this morning above 2500 feet for Central Panhandle Mountains-Coeur d'Alene Area- Idaho Palouse-Northern Panhandle.

Winter Weather Advisory until 11 AM PDT this morning above 3000 feet for Lewis and Southern Nez Perce Counties.

WA . Winter Weather Advisory until 11 AM PDT this morning for the cascade crest including highway 2 between coles corner and stevens pass for East Slopes Northern Cascades.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sandpoint, Sandpoint Airport, ID30 mi33 minS 35.00 miLight Snow32°F32°F100%1010.2 hPa

Link to 5 minute data for KSZT

Wind History from SZT (wind in knots)
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1 day agoS6S6S4SW7SW7S4W5SW6CalmCalmCalmCalmW3NE3CalmCalmCalmCalmCalmCalmCalmCalmCalmW4
2 days agoSW5S4S7S6CalmCalmCalmCalmCalmCalmCalmCalmS3S4S4S4SW4S5S4SW3SW3S4SW3S3

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS 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 (12,3,4,5)
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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 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 numerous 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.