Lewiston, ID Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Lewiston, ID

April 21, 2024 8:41 PM PDT (03:41 UTC) Change Location
Sunrise 5:47 AM   Sunset 7:45 PM
Moonrise 5:43 PM   Moonset 5:01 AM 
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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.

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7 Day Forecast for Marine Location Near Lewiston, ID
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Area Discussion for - Spokane, WA
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FXUS66 KOTX 212318 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 418 PM PDT Sun Apr 21 2024

SYNOPSIS
Mild and dry weather returns for the start of work week with 60s and 70s by Tuesday. A subtle cooling trend arrives Wednesday into Thursday with small chances for mountain showers. Unsettled weather continues Friday through the weekend with better chances for precipitation across the lowlands.

DISCUSSION
Sunday night through Tuesday: The upper level trough to the northeast of the Inland Northwest will continue to move eastward as upper level ridging begins to amplify and shift in from the west. Radar this afternoon shows light rain showers across northeast Washington and north Idaho as a trailing weak shortwave passes through southeastern British Columbia. A tight southwest surface pressure gradient that has brought breezy conditions across the region has begun to weaken this afternoon and will continue to decrease over the next couple of hours.

Decreasing winds this evening and clear skies will allow temperatures to drop near to slightly below freezing regionwide. We have issued a frost advisory for areas around Moses Lake and northeastern Nez Perce county where growing season has begun and models indicate a 70-80% chance for frost development tonight.

Models show some continued influence from the upper level trough across far north Idaho Monday afternoon for isolated light shower development. Ridging will center over the Inland Northwest Monday night as an upper level low approaches the northern British Columbia coast. Tuesday will be the warmest day of the week under this ridge with highs in upper 60s to mid 70s.

Wednesday: A closed upper level low will move inland British Columbia early Wednesday with a weak cold front pushing across the Inland Northwest. There is strong agreement that precipitation will remain in the mountains, although there is a small subset (9%) of ensembles that depict a more southern track of the upper level low, which would result in more widespread light precipitation over eastern Washington. Regardless, this system will bring subtle cooling along with breezy southwest winds on Wednesday.

Thursday through Sunday: Weather will become more active late Thursday evening into Friday as surface low approaches the Washington coast and an upper level trough digs along the western US. Models are in good agreement for precipitation to expand into the eastern third of Washington, but differences in the overall strength and track of the shortwave result in high uncertainty in the total amounts. Right now, the NBM is giving the eastern third of Washington a 40-50% chance of a tenth of an inch of rainfall during the 72 hour period from 5 AM Thursday through 5 AM Sunday.
For the Idaho Panhandle, this chance increases to 70-80% for a tenth and a 50-60% chance for two tenths. /vmt

AVIATION
00z TAFS: Gusty winds will taper off this evening as the cumulus and showers dissipate this evening. Lee side mountain wave clouds have decreased in coverage and shifted south across the southern Columbia Basin. Anticipate VFR conditions for the rest of the period with bands of cirrus by Monday afternoon and wind speeds under 10kts.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence in VFR conditions and forecast details. Given the dry airmass, chances for valley fog near rivers remain low by early Monday morning.
/rfox

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Confidence descriptors: Low - Less than a 30 percent chance Moderate - 30 to 70 percent chance High - Greater than a 70 percent chance

For additional probabilistic information for NWS Spokane airports, please refer to the Aviation Dashboard on our webpage: https:// www.weather.gov/otx/avndashboard

PRELIMINARY POINT TEMPS/POPS
Spokane 32 59 35 69 42 65 / 0 0 0 0 10 10 Coeur d'Alene 32 57 34 68 41 64 / 0 0 0 0 10 10 Pullman 32 55 34 66 42 62 / 0 0 0 0 10 10 Lewiston 38 63 39 73 47 70 / 0 0 0 0 10 10 Colville 28 61 31 69 38 66 / 0 0 0 0 10 10 Sandpoint 33 56 34 66 40 63 / 10 0 0 0 10 10 Kellogg 34 55 37 67 44 63 / 0 0 0 0 10 10 Moses Lake 33 64 36 72 43 70 / 0 0 0 0 0 0 Wenatchee 36 62 42 69 47 66 / 0 0 0 0 0 0 Omak 33 65 38 71 45 69 / 0 0 0 0 0 10

OTX WATCHES/WARNINGS/ADVISORIES
ID...Frost Advisory from 2 AM to 8 AM PDT Monday for Lewiston Area.

WA...Frost Advisory from 2 AM to 8 AM PDT Monday for Moses Lake Area.




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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KLWS LEWISTONNEZ PERCE COUNTY,ID 3 sm45 minWSW 0910 smClear54°F25°F32%30.18
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