Friday, September17, 2021
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Marine Weather and Tides
Spokane Valley, WA

Version 3.4
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3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 6:28AMSunset 6:58PM Friday September 17, 2021 1:16 AM PDT (08:16 UTC) Moonrise 6:06PMMoonset 2:11AM Illumination 82% 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 Spokane Valley, WA
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location: 47.64, -117.19     debug


Area Discussion for - Spokane, WA
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FXUS66 KOTX 170432 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 932 PM PDT Thu Sep 16 2021

SYNOPSIS.

Dry weather continues tonight, but clouds will start to increase ahead of the next system. That system moves into the region between Friday and Sunday, with rainy and breezy conditions and cooler temperatures. The area starts to dry out in the new work week, save for some passing slight shower chances. Temperatures will also moderate back towards normal values by the middle of next week.

DISCUSSION.

. First fall like weather system of the season to deliver moderate to heavy rain to portions of the Inland Northwest Friday into the weekend .

Tonight through Saturday night: A large swath of sub-tropical moisture is making its march across the eastern Pacific along the 45N parallel. There is up to 1.5 to 1.75 inches of P-wats contained in the plume currently, which is up to 200% of normal for this time of year. Satellite imagery depicts a couple distinct shortwave disturbances along this plume: one out at 140W, which will swing through a warm front on Friday, and the other out around 158W will push across a cold front on Saturday. The warm front tomorrow will result in increasing moderate to heavy rain over the Cascades. Westerly winds of 40-50 kts at ridge top level will result in strong downsloping along the east slopes of the Cascades with rain decreasing dramatically away from the crest. By the time moisture reaches Wenatchee, Waterville, and Omak, it looks as if only very light rain or sprinkles will fall for tomorrow afternoon. Southerly winds into the northeast Washington and into the Idaho Panhandle will result in better upslope into the higher terrain there where light rainfall is expected. The rest of the region will mainly just see thickening mid to high level clouds tomorrow as low levels will be starting out very dry. Southerly winds across the Palouse, Spokane West Plains and western portion of the Columbia Basin will result in elevated fire weather conditions due to a combination of low RHs and breezy winds.

That next shortwave out there in the Gulf of Alaska will dig Friday as it races across the eastern Pacific. The process of the this shortwave digging will slow down its progression with the cold front taking much of Friday night into Saturday to actually push across the Inland Northwest. The cold front is expected to push east of the Cascades between midnight to early Saturday morning. This front will result in a continued potential of moderate to heavy rain over the Cascade crest. Rainfall rates will also increase with this front across the extreme eastern Washington and into the Idaho Panhandle as it makes its march Saturday morning into Saturday afternoon. The front looks to move more slowly as it pushes across the southeast portion of the forecast area and may even get hung up Saturday evening into Saturday night over northeast Oregon to the southern/central Idaho Panhandle. The moisture plume won't be quite as wet by Saturday night, but may see a steady light to moderate rain under the front where it becomes hung up.

Rainfall totals Friday through Saturday will vary substantially depending on the location. The Cascade crest will see the potential for 2 to 3 inches with locally higher amounts possible. This will be a concern for debris flows on the Cedar Creek and Cub Creek burn scars as well as general rock slides in steep terrain. The threat for debris flows on the burn scars that a Flash Flood Watch has been issued during the period of heaviest rainfall from Friday afternoon through Saturday morning, which may see impacts out over Highway 20 near Mazama. Further away from the Cascade crest in the lee of the Cascades, we may see less than a tenth of an inch of rainfall due to the strong westerly flow. Between a quarter to a half of an inch of rainfall is expected with the cold front over the Upper Columbia Basin, Palouse, Spokane Area, Northeast Mountains, and higher amounts still over the Panhandle between 0.50 to 1.00 inches on average. This rainfall is not expected to cause much in the way of impacts and will be a welcome sight after a very dry summer season. We will need to keep an eye on flashier creeks such as Paradise Creek for minor flooding, but even this looks like a low threat.

Winds will be a bit breezy with cold front passage Saturday morning. Winds are expected to gusts to between 25 to 35 mph late Saturday morning into Saturday afternoon. We should see enough rain/moisture over the basin that blowing dust doesn't seem to be a concern with these kinds of wind speeds. Daytime temperatures will be much cooler on Saturday with the rain and clouds with highs in the upper 50s to mid 60s. /SVH

Sunday to Thursday: Wet weather continues at the start of the new week, before conditions turn drier and temperatures warm to more seasonal values. A broader upper trough dominates the region Sunday, with the main axis and slug of moisture bringing a good chance of precipitation near the Cascades and the eastern third of WA and ID. Chances will be highest in the afternoon/early evening. The higher precipitation amounts this go around are expected over the ID Panhandle and secondarily over the eastern third of WA, with forecast amounts between 0.20 to 0.75" and locally near 1.0" over the central Panhandle. Additionally there is a fair amount of instability with this trough, with some risk for t-storms. There is a limited risk in the morning with lingering elevated instability. However the better risk will be in the afternoon and early evening. Any that may develop are not expected to be well- developed with little to no organizing shear.

Then Sunday night into Monday a ridge starts in from the west, pushing the main threat of rain back against the Cascade crest and toward the far eastern third of WA and ID. Tuesday to Wednesday a ridge builds in, while the next trough approaches from the west to move in Wednesday night into Thursday. That trough looks to stretch and weaken on its way inland and carries limited moisture. So there will be shower chances around the mountains Tuesday, spilling out across the region Wednesday into Thursday. At this point the chances are only slight. Otherwise conditions will be dry and partly cloudy. /Cote'

AVIATION. 06Z TAFS: VFR conditions across the Inland Northwest through Friday evening. A moist storm system will impact the Northwest region Friday and into the weekend. Mid to high level clouds will thicken up across eastern Washington and the Idaho Panhandle overnight into Friday morning. Ceilings will continue to lower through the day Friday with rain likely over the Cascade crest by Friday afternoon. The atmosphere will take more time to moisten up across extreme eastern Washington and the Idaho Panhandle with deteriorating conditions for these areas Friday night into Saturday morning. Breezy southerly pre-frontal winds expected Friday afternoon with gusts to around 20-25 kts possible, especially across the Columbia Basin and up the Okanogan Valley. JW

PRELIMINARY POINT TEMPS/POPS. Spokane 44 68 52 59 46 58 / 0 10 10 90 60 80 Coeur d'Alene 41 67 51 57 47 57 / 0 20 10 90 70 90 Pullman 39 71 51 60 43 55 / 0 10 0 80 60 90 Lewiston 46 79 58 68 53 63 / 0 0 0 80 60 90 Colville 38 65 46 59 40 59 / 0 30 50 90 70 90 Sandpoint 36 62 47 56 43 54 / 0 30 20 100 80 90 Kellogg 45 68 52 59 47 53 / 0 10 10 80 80 90 Moses Lake 45 69 54 64 45 62 / 0 20 20 80 40 70 Wenatchee 53 66 55 65 52 63 / 0 30 70 50 50 80 Omak 48 66 53 64 48 65 / 0 30 40 50 40 70

OTX WATCHES/WARNINGS/ADVISORIES. ID . None. WA . Flash Flood Watch from Friday afternoon through Saturday morning for Okanogan Highlands-Okanogan Valley-Upper Columbia Basin- Western Okanogan County.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Spokane, Felts Field, WA7 mi23 minNE 310.00 miFair47°F32°F56%1016.1 hPa
Spokane, Spokane International Airport, WA18 mi23 minN 010.00 miMostly Cloudy50°F23°F35%1015.7 hPa
Coeur d'Alene Airport - Pappy Boyington Field, ID22 mi20 minNE 510.00 miFair41°F29°F62%1018.8 hPa
Fairchild Air Force Base, WA24 mi78 minESE 310.00 miFair46°F23°F40%1016.4 hPa

Link to 5 minute data for KSFF

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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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