Friday, January24, 2020
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Marine Weather and Tides
Lewiston, 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 7:18AMSunset 4:41PM Friday January 24, 2020 8:52 AM PST (16:52 UTC) Moonrise 8:30AMMoonset 5:31PM Illumination 0% Phase: New Moon; Moon at 29 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 Lewiston, ID
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location: 46.39, -116.98     debug


Area Discussion for - Spokane, WA
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FXUS66 KOTX 241023 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 223 AM PST Fri Jan 24 2020

SYNOPSIS. A mild and active weather pattern is expected into next week with several rounds of mainly valley rain and mountain snow.

DISCUSSION. Today through Sunday: The mild and wet pattern continues with a series of waves tracking into the region from the southwest.

Today: The first system in the form of an occluded front will track across Eastern Washington and North Idaho this morning bringing widespread rain and high mountain snow. Behind it westerly flow will lead to a drying trend over Central WA by early morning and across much of Eastern WA late morning or early afternoon while showers will be more prevalent in the Cascades and Idaho Panhandle. Breezy winds across the Columbia Basin behind the front combined with mild 850mb temperatures around 2C should translate to mild temperatures in the mid 40s to low 50s for highs.

Tonight and Saturday: A mid level wave passing through tonight will keep showers persisting across the ID Panhandle and Cascades with snow levels dropping to around 3000 feet. Light accumulations are possible in the mountains. On Saturday yet another wave reaches Central WA in the morning and then NE WA/N Idaho late morning into the afternoon. Precip amounts are light, but could lead to a rain/snow mix northern valleys and Cascade valleys and valley rain/mountain snow elsewhere.

Saturday night and Sunday: A stronger system arrives as a surface low deepens to around 995mb as it tracks north near or just off the WA coast. This is expected to bring widespread precipitation into the region especially overnight Saturday night into Sunday morning with snow levels ranging from 3000-5000 feet for most of the area resulting in valley rain and mountain snow. Snow levels could begin lower however along the East Slopes of the Cascades. In addition an easterly pressure gradient over the area will provide increased isentropic ascent and precipitation amounts for the Cascades. Moderate snow accumulations of 6 to 10 inches are likely in the mountains. Snow amounts around Winthrop, Stehekin, and Lake Wenatchee are a tougher call as surface temperatures may have a hard time dropping down to freezing Saturday night before precipitation arrives due to abundant boundary layer moisture and stratus limiting temperature falls. Most model guidance suggest the Methow Valley will be cold enough for snow, with a rain/snow mix more likely for the Leavenworth and Lake Wenatchee areas. Wet snow may also occur on the Waterville Plateau and near the Canadian border before snow levels rise. Accumulations in these areas should be light. As the low weakens and tracks into British Columbia on Sunday mild southwest winds again develop across the Columbia Basin, Spokane area, Palouse, and LC Valley with highs again very mild in the mid 40s to near 50. JW

Sunday night through Friday: Subtle change in the overall weather pattern for the start of next week. Instead of weather systems coming at us from the southwest, they will be more from the west. Thus they will be a little cooler, for a little better chance of low-elevation snow, mainly in the late night and morning hours. Not looking for anything appreciable even if it does occur.

Looks like there might be a brief break in the precipitation around Tuesday night or Wednesday. But another even warmer system moves in around Thursday. Snow levels in the Panhandle rise to about 5000 feet.

The cold front that comes through the region on Thursday night and Friday could be a windy one. Not much computer model agreement on it at this point, but some ensemble members show the potential for a high wind event. Too far out in the forecast to get into details, but it will bear watching. RJ

AVIATION. 06Z TAFS: A slow moving occluded front running north to south form KBLI to KAST at 06Z Friday will slowly track through the region through the next 24 hours to the ID/MT border by 00Z Saturday. A feed of Pacific moisture will bring widespread RA ahead of and along this front impacting most TAF sites with MVFR and IFR conditions. The KEAT and KMWH TAF sites will deteriorate to LIFR conditions in a very moist and calm boundary layer during occasional breaks in pcpn. The KLWS and KPUW TAF sites should remain MVFR or low VFR during this period with southeasterly downslope flow ahead of the occlusion. /MJF

HYDROLOGY. The repeated pattern for warmth, rain and snow melt will continue to cause creeks and streams to rise. If there are any hydrologic problems they would be most probable in southeast Washington and the southern ID Panhandle. The Palouse and St Joe mainstem rivers will also see rises this weekend and next week. RJ

PRELIMINARY POINT TEMPS/POPS. Spokane 46 34 40 35 45 36 / 90 30 40 50 90 30 Coeur d'Alene 44 34 39 35 42 36 / 100 50 40 40 90 40 Pullman 46 35 42 37 45 35 / 90 20 20 50 90 30 Lewiston 51 37 47 41 50 39 / 90 10 20 50 80 30 Colville 41 33 38 34 43 34 / 90 20 60 50 90 40 Sandpoint 42 36 38 34 40 37 / 100 70 60 40 90 60 Kellogg 43 35 39 34 41 36 / 100 80 50 40 90 60 Moses Lake 51 34 42 37 50 36 / 20 10 40 70 80 20 Wenatchee 43 31 39 34 43 33 / 30 10 60 70 80 30 Omak 37 32 37 35 39 35 / 50 0 50 60 90 20

OTX WATCHES/WARNINGS/ADVISORIES. ID . None. WA . None.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lewiston, Lewiston-Nez Perce County Airport, ID2 mi1.9 hrsSW 610.00 miOvercast45°F37°F77%1014.1 hPa

Link to 5 minute data for KLWS

Wind History from LWS (wind in knots)
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Last 24hrSE7E85S7S8S6S13SE8SE6E11E10E10E11E11E5SE6E8E9E13SE4CalmSE11SW6Calm
1 day agoCalmCalm4CalmS3W3CalmS4S11
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2 days agoCalmS7CalmSE5E4E5S5NE3NE3S5CalmCalmE3CalmCalmCalmCalmCalmS8W5SW8SW3W3Calm

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Spokane, WA (11,2,3,4)
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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.