Thursday, April22, 2021
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Marine Weather and Tides
Ponderay, ID

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 5:42AMSunset 7:48PM Thursday April 22, 2021 6:57 PM PDT (01:57 UTC) Moonrise 2:08PMMoonset 4:12AM Illumination 85% Phase: Waxing Gibbous; Moon at 11 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 Ponderay, ID
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location: 48.36, -116.55     debug


Area Discussion for - Spokane, WA
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FXUS66 KOTX 222310 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 410 PM PDT Thu Apr 22 2021

SYNOPSIS. Showers over the Idaho Panhandle and eastern third of Washington are expected to dissipate by sunset this evening. Friday will be a mild day with increasing clouds. Saturday will be cool and rainy and our region will likely receive its most significant and widespread precipitation since late February. Sunday and Monday will feature hit or miss showers with a much lesser chance of precipitation on Tuesday. Then, mid-week, another wet period awaits the Inland Northwest.

DISCUSSION.

Tonight: Clusters of showers will drift to the southeast at 15 to 20 mph for the remainder of the afternoon into early this evening. Localized rain amounts over the Idaho Panhandle will be up to a quarter inch under some of the larger cells. Precipitation amounts in eastern Washington will be lighter and spotty. With the loss of afternoon warming, showers will decrease in coverage between 6 PM and 8 PM, and the shortwave enhancing lift shifts into southern Idaho. Look for clearing skies overnight and winds will diminish as well. North winds gusting between 20 and 30 mph down the Okanogan Valley should diminish into the 5 to 10 mph range after midnight. Morning lows will be seasonably cool with 30s over most of the Idaho Panhandle and eastern Washington and low 40s in the Wenatchee and Lewiston areas.

Friday: A transient upper level ridge will deliver quiet and pleasant weather to the Inland Northwest on Friday. Partly cloudy skies in the morning will give way to increasing mid and high clouds in the afternoon. High temperatures will be close to average with upper 50s in north Idaho and 60s across the lowlands of eastern and central Washington.

Saturday: The set up for Saturday looks favorable for our most significant and widespread rain event in well over a month. There is good model agreement that an upper trough will pivot inland during the day Saturday producing a slow moving swath of much needed rain for Washington and Idaho. At this time, a blend of precipitation from numerous models yields between a third and a half an inch of rain across the mountainous terrain of north Idaho as well as northeast and north central Washington. Places like Pullman, Spokane, Wilbur and Grand Coulee have a shot of a tenth to a quarter of an inch. Unfortunately our central Washington precipitation shadow will likely limit Wenatchee, Moses Lake, and Ritzville to a tenth of an inch or less. /GKoch

Sunday through Thursday . We pick up the forecast Sunday afternoon as the upper level trof axis drifts inland. The axis will be along a line from approximately northern California up through northern Saskatchewan. This axis places the coldest air aloft directly over eastern Washington and northern Idaho. The cold air aloft typically results in convective afternoons with hit and miss showers mainly over the mountains. This will be the case late in the weekend and then continuing into Monday.

By Monday, the trof begins to fill as it slowly transitions to the east leaving the PacNW in cold unstable northwest flow. The best chance of thunderstorms will be Monday as an impulse drops across the region. Partly cloudy skies will give way to showers and thunderstorms, much like what is happening today in eastern WA and north Idaho.

After our round of convection Monday, the trof continues to move east allowing a ridge to build back along the west coast. Temperatures climb through the rest of the week with the daily max a few degrees above normal through midweek.

A few notes of interest about this ridge as it builds mid week. The models are very consistent Monday through Wednesday with very little differences from run to run. This increases our confidence in the warming trend allowing us to focus a little more on the fine details with the forecast. The other note of interest is regarding the trajectory of the upper level flow. The southwesterly flow aloft will actually usher in quite a bit of moisture. The relatively flat ridge will not be enough to squash afternoon weak showers from developing. All of that to say that mid to late next week may be slightly above normal temperatures but we should still see afternoon showers developing in the favored areas. This reminds me of the CPC outlook from last week that depicted the region in above average temperatures and above average precipitation . which is consistent with what I am seeing now. /AB

AVIATION. 00Z TAFS: Scattered showers have cleared the Spokane area, but will linger around Couer d'Alene, Sandpoint, Kellogg, Pullman and Lewiston through 02-04z. With the loss of daytime heating convection will diminsh through the evening. Gusty winds in the Omak and Wenatchee areas will also diminish with the setting sun. Mainly clear skies are expected overnight into Friday morning with mid and high clouds increasing during the day. /GKoch

PRELIMINARY POINT TEMPS/POPS. Spokane 36 62 43 53 38 57 / 20 0 10 70 50 20 Coeur d'Alene 35 59 41 52 38 55 / 20 0 0 80 60 30 Pullman 36 60 43 52 37 55 / 30 0 10 70 30 30 Lewiston 42 67 48 60 42 61 / 20 0 0 60 30 30 Colville 33 64 42 54 36 56 / 20 0 10 80 80 50 Sandpoint 34 57 39 50 38 52 / 30 0 10 90 90 70 Kellogg 34 56 40 49 39 51 / 50 10 10 90 70 60 Moses Lake 39 68 47 60 38 65 / 0 0 10 30 10 10 Wenatchee 44 67 47 57 41 61 / 0 0 10 50 20 10 Omak 36 67 45 57 41 62 / 0 0 20 70 50 30

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




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sandpoint, Sandpoint Airport, ID4 mi63 minNE 1010.00 miPartly Cloudy50°F37°F62%1009.1 hPa

Link to 5 minute data for KSZT

Wind History from SZT (wind in knots)
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Last 24hrSW4W3CalmS4S6S4SW4CalmNW4SW4CalmCalmCalmCalmE6E6E10E7NW5NE6NE10
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1 day agoN3CalmCalmCalmCalmCalmCalmCalmCalmW3CalmCalmCalmCalmNE4E3E5E7E6E8E7S7S10
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2 days agoE6N3CalmN4CalmNE3CalmN3CalmN4CalmCalmCalmNE6SE6E7SE6SE5SE4SE4SE5SE6SE7E3

Tide / Current Tables for
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GEOS Local Image of PacificNorthwest    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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