Thursday, February20, 2020
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Marine Weather and Tides
Leavenworth, WA

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 6:56AMSunset 5:33PM Thursday February 20, 2020 10:39 AM PST (18:39 UTC) Moonrise 5:50AMMoonset 2:33PM Illumination 9% Phase: Waning Crescent; Moon at 27 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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PZZ135 Puget Sound And Hood Canal- 908 Am Pst Thu Feb 20 2020
Today..Light wind. Wind waves less than 1 ft.
Tonight..Light wind. Wind waves less than 1 ft.
Fri..Light wind. Wind waves less than 1 ft.
Fri night..Light wind. Wind waves less than 1 ft.
Sat..Light wind. Wind waves less than 1 ft.
Sat night..Light wind becoming S to 10 kt after midnight. Wind waves less than 1 ft becoming 1 ft or less after midnight.
Sun..SW wind 5 to 15 kt. Wind waves 2 ft or less.
Mon..SW wind to 10 kt becoming light. Wind waves 1 ft or less.
PZZ100 908 Am Pst Thu Feb 20 2020
Synopsis for the northern and central washington coastal and inland waters..Light offshore flow will continue today and light onshore flow might develop Friday. A weak front will reach the area Saturday morning and another front will reach the area Sunday or Sunday night. The second front will yield increasing winds and seas.


7 Day Forecast for Marine Location Near Leavenworth, WA
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location: 47.7, -120.91     debug


Area Discussion for - Spokane, WA
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FXUS66 KOTX 201801 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 1001 AM PST Thu Feb 20 2020

SYNOPSIS. Dry weather with mostly clear skies and near average temperatures will continue through Saturday. A storm system over the weekend is expected to bring increasing chances for rain and snow, along with gusty winds Sunday into Monday. Drier weather returns next week.

DISCUSSION. Morning update: Dry weather persists today. Updated the forecast this morning to tweak winds, as easterly winds have developed near CdA, the Palouse, and portions of the Columbia Basin. The forecast is otherwise on track. Dang

Previous Discussion: Today through Saturday: A Low will dropping to our South and pushing through Central California. It will help shift the ridge eastward for through Friday and allow a zonal flow pattern to set in over the Pacific Northwest. Moisture will begin to pump into the region over the Cascades and an increasing in mid to upper level clouds is expected starting Friday. A weak dry shortwave will push through the region. The Cascade Crest could get some spill over moisture from Western WA but not lot impacts expected from it. Temperatures are expected to be similar to past couple of days. Highs will in the 40s to low 50s. Lows will be in the 20s to low 30s. /JDC

Sunday and Monday . This should be the most active portion of the next 7 days as the model guidance remains consistent on bringing in a relatively strong low pressure area sometime during this period. The trend for this feature is one of strengthening and slowing per the EC ensemble means and to a certain extent the GEFS mean. This suggests the bulk of the precipitation now looks like it will hold off until late Sunday morning or afternoon before the cold front tracks through during the evening. This slower timing will yield slightly higher snow level due to diurnal warming. It appears most of what falls in the valleys will fall as rain except for valleys in the immediate lee of the Cascades as well as those near the Canadian border. Even if snow does fall in these valleys, mild daytime temperatures could limit the accumulations, especially on the roads. It seems the biggest issues with this system will revolve around snow over the higher mountains and passes. We suspect Stevens Pass will be subject to a significant amount of snow . perhaps nearing 10 inches or slightly more through early Monday morning before the dendritic layer begins to desiccate. Lookout Pass will also see some decent snow amounts (4-8 inches for now but subject to change) which will likely impact travel through Monday afternoon.

After the cold front moves through Sunday night into Monday we are looking at a steady increase in winds and a good chance of unstable snow showers associated with the upper level trough. As for the winds, there is fairly good agreement now that the peak will occur Sunday evening as the surface low pushes across southern BC. 850 mb winds are in the 35-40kt range which would support wind gusts nearing 40 mph if it occurs before the atmosphere decouples overnight. Snow accumulations will be hit or miss over the valleys and we don’t anticipate any heavy valley accumulations at this time. By Monday night the dendritic layer begins to dry out over the entire forecast area, clearing the southern half of the Idaho Panhandle last, resulting in dry weather.

From Tuesday through Wednesday we are looking at dry weather as the next upper level ridge builds over the Inland Northwest. Temperatures during the Sunday through Wednesday time period will likely peak on Sunday ahead of the cold front with valley highs in the 40s to lower 50s. They will then cool off into the upper 30s and 40s on Monday and Tuesday before warming slightly thereafter. fx

AVIATION. 18Z TAFS: VFR conditions continue the next 24 hours. Easterly winds of 5-10 kt near KGEG-KLWS, and 10-16 kt near KPUW-KLWS will continue through early afternoon before slowly diminishing. Dang

PRELIMINARY POINT TEMPS/POPS. Spokane 43 22 44 28 44 30 / 0 0 0 0 0 10 Coeur d'Alene 42 21 44 28 43 30 / 0 0 0 0 0 10 Pullman 41 27 45 30 45 33 / 0 0 0 0 0 10 Lewiston 48 30 50 34 51 37 / 0 0 0 0 0 10 Colville 41 19 42 24 43 27 / 0 0 0 0 0 10 Sandpoint 39 20 40 24 40 28 / 0 0 0 0 10 20 Kellogg 41 24 43 28 42 29 / 0 0 0 0 0 20 Moses Lake 46 25 46 29 49 31 / 0 0 0 0 0 0 Wenatchee 42 27 44 31 47 32 / 0 0 0 0 0 10 Omak 41 23 41 28 43 30 / 0 0 0 0 0 10

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




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 81 mi39 min N 5.1 G 6 42°F 1025.2 hPa (+0.9)37°F
TCNW1 - 9446484 - Tacoma, WA 85 mi57 min 39°F 48°F1025.2 hPa

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Stampede Pass, WA36 mi1.7 hrsVar 510.00 miFair25°F19°F78%1028.2 hPa

Link to 5 minute data for KSMP

Wind History from SMP (wind in knots)
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Last 24hr5655464556NE7656656566NE8556
1 day ago3334CalmCalmCalmCalm33NE34553463354645
2 days ago------------------------------------------Calm33

Tide / Current Tables for Everett, Washington
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Everett
Click for Map
Thu -- 04:05 AM PST     11.33 feet High Tide
Thu -- 05:56 AM PST     Moonrise
Thu -- 07:07 AM PST     Sunrise
Thu -- 09:22 AM PST     7.11 feet Low Tide
Thu -- 02:00 PM PST     9.76 feet High Tide
Thu -- 02:38 PM PST     Moonset
Thu -- 05:38 PM PST     Sunset
Thu -- 09:13 PM PST     -0.57 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.17.59.510.811.311108.77.77.17.27.88.79.59.89.48.46.64.420.3-0.5-0.21.1

Tide / Current Tables for Marysville, Quilceda Creek, Washington
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Marysville
Click for Map
Thu -- 04:14 AM PST     10.99 feet High Tide
Thu -- 05:56 AM PST     Moonrise
Thu -- 07:07 AM PST     Sunrise
Thu -- 09:52 AM PST     6.39 feet Low Tide
Thu -- 02:09 PM PST     9.46 feet High Tide
Thu -- 02:37 PM PST     Moonset
Thu -- 05:38 PM PST     Sunset
Thu -- 09:43 PM PST     -0.51 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.26.68.810.31110.89.88.57.46.66.46.97.98.99.59.28.4752.80.9-0.3-0.50.4

Weather Map
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wmap_P
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 (13,3,4,5)
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Ground Weather Radar Station Seattle/Tacoma, WA
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Disclaimer:
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.