Friday, August7, 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 5:36AMSunset 8:11PM Friday August 7, 2020 11:07 AM PDT (18:07 UTC) Moonrise 10:23PMMoonset 9:39AM Illumination 86% 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 Lewiston, ID
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location: 46.39, -116.98     debug


Area Discussion for - Spokane, WA
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FXUS66 KOTX 071728 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 1028 AM PDT Fri Aug 7 2020

SYNOPSIS.

A dry weather pattern is expected through the middle of next week. A gradual warming trend will take place over the weekend with highs Monday rebounding into the mid 80s to mid 90s. Lower pressure digging in over the Inland Northwest by the middle part of next week will bring cooler temperatures intermixed with breezy periods. Chances are a bit higher for showers toward the end of next week.

DISCUSSION. Quick update: Adjusted cloud cover for the afternoon and high temperatures for the day after our cool start this morning./rfox.

Today through Saturday night: Water Vapor Satellite shows drier air moving into the area this morning on the back side of an exiting upper trough. This will result in a dry day across the region with just some flat cumulus over the area. For tonight a plume of pacific moisture noted on satellite off the WA coast will move into the region as an upper trough tracks into British Columbia. Models are not generating much in the way of precipitation with this feature as the best lift tracks north of the Canadian border but a swath of mid and high clouds should reach Central WA this evening and then Eastern WA/N Idaho overnight. Chance of light rain is currently limited to the Cascade crest.

Behind this system drier air mixes down for Saturday afternoon. The trough passing to our north and east will also slightly enhance pressure gradients over the area especially near the Cascades where breezy west winds are expected around the Wenatchee, Chelan, and Vantage areas as well as through the Methow Valley during the afternoon and evening. A push of breezy north winds are also expected down the Okanogan Valley Saturday evening. With highs in the mid 80s in these areas along with relative humidity expected to drop to near 20 percent there will be an elevated risk of fire spread with any new fire starts. Critical wind/rh thresholds are not expected to be met but will continue to be monitored. JW

Sunday through Tuesday night: Dry northwesterly flow over the Inland Northwest with daytime temperatures warming a bit above average with highs climbing back into the 80s and low 90s for our warmer spots by Monday. Clear nights and strong radiational cooling will keep Monday morning low temperatures on the cooler side with colder pockets down into the lower 40s.

By Tuesday, the flow pattern aloft will back more westerly and southwesterly in response to a shortwave disturbance moving in. The front will be dry and not expecting much if any precipitation except possibly near the Canadian border over the mountains. Winds will increase though and fire weather concerns will be heightened with breezy winds combined with the drier conditions. Tuesday afternoon and evening may be a period that fire weather highlights will be needed for Cascade gaps and into the basin.

Wednesday through Friday: There is greater uncertainty this further out in the extended portion of the forecast with low confidence on forecast details. The GEFS is slower with a low pressure trough digging in over the region compared to the ECMWF ensemble mean. Overall though, the pattern at upper levels looks trofy with temperatures near average for mid August. The 00Z operational GFS run is also quite wet for Thursday along the leading edge of the cold front. The 00Z ECMWF solution maintains a dry forecast with moisture lacking. So, higher confidence on the temperature trend and low confidence on precipitation or breezy periods. /SVH

AVIATION. 18Z TAFS: Expect flat high cumulus and some high cirrus acros the TAF sites through the period. Overnight a mid level wave will bringing increasing mid and high clouds. Winds will be lower today compared to yesterday, yet some locally gusty is possible from KEAT to KGEG. Terrain driven winds will be found near KEAT as gap winds pickup this evening. Most other areas will experience light winds. /rfox.

PRELIMINARY POINT TEMPS/POPS. Spokane 75 56 81 51 82 52 / 0 10 0 0 0 0 Coeur d'Alene 73 53 79 51 80 52 / 0 0 0 0 0 0 Pullman 72 51 78 47 79 47 / 0 0 0 0 0 0 Lewiston 80 58 87 58 86 57 / 0 0 0 0 0 0 Colville 77 52 82 47 83 50 / 0 10 0 0 0 0 Sandpoint 73 50 76 47 79 46 / 0 10 0 0 0 0 Kellogg 70 53 76 52 77 51 / 0 0 0 0 0 0 Moses Lake 80 56 86 56 87 55 / 0 0 0 0 0 0 Wenatchee 81 60 83 58 87 57 / 0 10 0 0 0 0 Omak 81 56 84 55 87 54 / 0 10 0 0 0 0

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 mi72 minNNW 710.00 miFair69°F39°F35%1019.9 hPa

Link to 5 minute data for KLWS

Wind History from LWS (wind in knots)
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Last 24hrSW5--NW10NW10
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1 day agoNE435--Calm34NE5E4W7NW6E34E3SE6SW13
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2 days agoNE35CalmCalmS4CalmNW53W3N4S7S7SE4SE3CalmSE4E3CalmS3CalmE53CalmNW4

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Spokane, WA (14,3,4,5)
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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.