Marine Weather and Tide Forecast for Lewiston, ID

SYNOPSIS
Today will remain breezy and dry with west to northwest winds.
Winds decrease further on Thursday, but temperatures remain warm and conditions dry into the weekend. A weather system for the weekend will bring more breezy conditions particularly for central Washington, and the continued dry conditions will increase fire weather concerns. Little in the way of moisture is anticipated into early next week with only a small potential for isolated showers near the Canadian border for Sunday.

DISCUSSION

Today and Tonight: The Inland NW will sit in a fast northwest flow, on the backside of yesterday's strong cold front. A mid-level shortwave slides along the jet across the northeast CWA in the morning to early afternoon. Expect some passing clouds and maybe a few cumulus around the mountains in the afternoon. Winds will remain breezy near the lee of the Cascades and Cascade gaps even in the morning and will increase else in the mid to late morning through the afternoon, before decreasing again through evening. Gusts of 15 to 25 mph are forecast, locally higher near the Cascade gaps in the late afternoon/early evening. Highs will be mild the upper 70s to 80s. With afternoon RH values in the mid- teens to lower 30s, the lee-side valleys east across the basin will still see elevated fire weather conditions.

Thursday to Tuesday: The Inland NW will remain in a progressive pattern, with largely dry weather. The northwest flow turns westerly as baggy trough approaches and slides by on the weekend.
Some afternoon clouds are expected around the mountains, with passing middle to high clouds from time to time. Ensembles have backed off again on the shower threat that was previously forecast for the northern counties this weekend. There is only a lingering slight chance near north Idaho Sunday afternoon, but the better risk stays north of the Canadian border. Winds will be occasionally breezy near the Cascades/Okanogan Valley the remainder of period, with another peak around Saturday when winds could gust 30 to 40 mph, strongest near the Cascades, Okanogan Valley and western Columbia Basin. Temperatures will be above normal through the period, with Wednesday seeing upper 70s and 80s and warming up toward the mid 80s to mid 90s Friday, before another slight drop into the weekend. As for Fire Weather in the extended, Saturday will be the next day to monitor for elevated to locally critical fire weather conditions for hot, dry, windy conditions. However confidence is low to moderate. The stronger winds may not entirely sync up with the lowest RH values, but it will be something to monitor since we have already see impacts from such conditions. /Solveig

AVIATION
06Z TAFs: A cold front will continue to exit and winds will continue to decrease tonight into the overnight. Winds increase late Wednesday morning to afternoon, gusting near 15-25kt, before decreasing. VFR conditions expected with limited cloud cover.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence in VFR conditions. Regional wildfires may produce localized smoke and reductions in visibility, but confidence in impacts to TAF sites is low.

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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 82 53 84 53 87 56 / 0 0 0 0 0 0 Coeur d'Alene 79 53 82 54 85 57 / 0 0 0 0 0 0 Pullman 77 48 80 51 86 54 / 0 0 0 0 0 0 Lewiston 84 55 88 58 94 61 / 0 0 0 0 0 0 Colville 81 48 84 49 87 52 / 0 0 0 0 0 0 Sandpoint 77 50 80 51 83 54 / 0 0 0 0 0 0 Kellogg 76 52 80 52 86 55 / 0 0 0 0 0 0 Moses Lake 86 54 88 57 93 58 / 0 0 0 0 0 0 Wenatchee 84 58 87 63 91 62 / 0 0 0 0 0 0 Omak 84 55 87 57 91 58 / 0 0 0 0 0 0

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