Tuesday, May26, 2020
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Marine Weather and Tides
Winthrop, 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 5:10AMSunset 8:46PM Tuesday May 26, 2020 10:16 AM PDT (17:16 UTC) Moonrise 7:19AMMoonset 11:45PM Illumination 21% 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 Winthrop, WA
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location: 48.47, -120.18     debug


Area Discussion for - Spokane, WA
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FXUS66 KOTX 261131 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 431 AM PDT Tue May 26 2020

SYNOPSIS. Expect lingering showers over northeast WA into the Idaho Panhandle today. A strong warming trend is expected from mid week into the weekend with many locations expected to reach the upper 80s to low 90s by Friday. A chance of thunderstorms will develop for the weekend with cooling temperatures back to near normal for early next week.

DISCUSSION. Today through Friday night . Good model agreement in both deterministic and ensemble model average flow regimes exists for today through the end of the week making for a fairly high confidence forecast for a drying and warming trend through Friday. A minor weak short wave disturbance transiting southern Canada will promote some lingering showers today over the mountains of extreme northeast Washington and the Idaho Panhandle . with the rest of the area drying and beginning to clear after areas of morning fog and low clouds associated with the wet boundary layer deposited by yesterday's storm system. High temperatures today will climb to about seasonal normal with increasing sunbreaks during the afternoon as morning stratus breaks out into fields of broken cumulus over the eastern basin . with mainly clear conditions over the western basin.

Wednesday through Friday the warming trend begins in earnest as a short wave rideg builds over the region. the rideg axis will move east of the forecast area on Thursday but this will put the region in a southerly flow warm advection regime which will spur temperatures to the warmest readings of the year so far and well above average. Expect widespread 80 degree readings by Thursday and mid 80s over much of the populated lower elevation areas with some lower to mid 90s readings in the lowest elevations of the Columbia Basin on Friday. All of this will be accompanied by dry conditions but with increasing high clouds by Friday as moisture gets caught up in the southerly flow. Way out on Friday evening moisture may become deep enough to promote a ghost of a chance of some showers over the higher terrain of the southeastern zones but the threat of a real rideg breakdown and associated active weather looks to hold off until late Saturday as detailed below. /Fugazzi

Saturday to Monday: The breakdown of the ridge of high pressure this period will carry the threat of showers and thunderstorms, some breezy conditions and a return to more seasonal temperatures by the start of next week. Saturday the area remains in a southerly flow with the ridge axis shifting from the north ID to western MT, while a sharp negatively-tilted trough moves north from California. The ingredients that have been described over the past few days for the potential for strong thunderstorms remains, including: the above normal heat (highs in the 80s and 90s), abundant moisture (with PWATs over 1 inch and dew points in the 50s to low-60s), and instability (with CAPE values between 500-2500 J/kg and LI values between -3 to -6C), and 0-6KM shear values around 40-60 kts. However that instability is moderately capped, with CIN values between 100-300 J/kg, and the instability weakens with the loss of daylight. So what this means is that if this moisture and instability is to be utilized to generate showers and thunderstorms, it appears it will need that sharp trough as a kicker to get things going, especially away from the higher terrain. At this point, models disagree on the precise timing and track of that shortwave trough coming up from California. Some computer models are quicker to bring it toward WA/north ID than others, before the main cold front/upper trough axis shifts through between late Saturday night and Sunday. Bottom line: showers and thunderstorm chances will increase across the region, with the highest risk Saturday afternoon and Saturday night. The best threat for thunderstorms will be before sunset and over the southeast CWA. If things sync up between lift, moisture and instability some rather strong thunderstorms are possible.

Then as Sunday morning progresses into afternoon the overall threat of showers and thunderstorms shifts toward the Cascades and northern mountains, as well as the far southeast CWA, while the risk decreases over the Columbia Basin. The area remains under the influence of the upper trough and moisture wrapped up in it. However overall instability is lower and the threat of strong thunderstorms will be more limited. However the passing system will also increase gradients and winds are expected to be breezy. Some guidance is suggesting wind gusts around 20-30 mph are possible, with a few outliers showing possible gusts up to 40 mph. Confidence in these details is limited, but either way it looks breezy. For Sunday night into Monday morning the area quiets down. However we will have to watch for some fog in the north to northeast valleys. Monday afternoon brings the threat of additional isolated to scattered showers and a limited threat of thunderstorms, with that latter threat mainly over the SE CWA at this point. Temperatures are expected to drop back closer to seasonal norms for Sunday and Monday. /Cote'

AVIATION. 12Z TAFS: A moist boundary layer from recent rain will promote upslope low MVFR and occasional IFR ceilings at the KGEG/KSFF and KCOE TAF sites through 16Z-18Z today with ceilings breaking up and lifting to VFR cumulus. The KLWS TAF site may experience in-and- out ST and BR under clear skies before VFR cloud ceilings move in around 14Z to 15Z. Otherwise a weak short wave brushing by to the north will promote isold -SHRA over the Idaho panhandle and northern mountains today with the KCOE TAF site possibly subject to a brief shower with VFR ceilings this afternoon. A rideg aloft will build over the region tonight providing VFR conditions through 12Z Wednesday. /MJF


PRELIMINARY POINT TEMPS/POPS. Spokane 71 46 75 49 80 53 / 10 0 0 0 0 0 Coeur d'Alene 69 45 74 48 80 52 / 20 0 0 0 0 0 Pullman 70 45 73 48 79 54 / 10 0 0 0 0 0 Lewiston 77 52 80 54 85 60 / 10 0 0 0 0 0 Colville 75 43 78 47 83 51 / 10 0 0 0 0 0 Sandpoint 69 43 74 49 78 53 / 30 10 0 0 0 0 Kellogg 67 50 72 49 78 54 / 40 0 0 0 0 0 Moses Lake 80 46 84 53 89 57 / 0 0 0 0 0 0 Wenatchee 78 49 82 56 86 59 / 0 0 0 0 0 0 Omak 77 47 80 53 85 56 / 0 0 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
Omak Airport, WA35 mi24 minN 010.00 miFair63°F50°F63%1015.9 hPa

Link to 5 minute data for KOMK

Wind History from OMK (wind in knots)
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Last 24hrE3CalmS7S7S7S8SE3N11N13N11N9NW6N4W5NW9NW4Calm4W3NW4CalmCalm3Calm
1 day agoS7S9SW13
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SE11S11SE9SE4S7S9S5S6W44W4CalmNW4NW3NE3CalmCalm
2 days agoN7NW6NW7NW5N6SE3CalmCalmS9S8SW7S8S7S5S5SW4W5W5W5CalmCalmSE4SE4S6

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 (13,3,4,5)
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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.