Marine Weather and Tide Forecast for Dover, ID

SYNOPSIS
Strong high pressure will remain in place through the upcoming weekend. Low clouds and fog is expected to expand into some of the valleys Tuesday night into Wednesday, then become established across much of the Inland Northwest by Thursday.

DISCUSSION
Today through next Tuesday: High pressure will dominate the period leading to stagnant conditions in the Inland Northwest. Strong inversions will be efficient at trapping pollutants near the ground, potentially leading to degraded air quality. These inversions are leading to quite warm temperatures in the mountains today (40s and 50s above 4000'). A weak shortwave and cold front passage Wednesday evening will usher in drier air and temporarily disrupt stagnant conditions (especially the Okanogan Valley) as northerly transport winds increase above 10 mph. A few sprinkles may come out of the sky with areas covered in stratus, otherwise this passage will be mostly dry. The ridge center will stay offshore through at least Sunday, leading to continuing dry and stagnant conditions. Ensembles signal the return of unsettled conditions around Tuesday with 75% showing weak troughing off the WA coast. DB

AVIATION
00Z TAFs: Areas of fog and low stratus will develop tonight with light boundary layer winds and relatively moist conditions with dewpoints in the 30s to low 40s. Confidence is low on the exact timing but the best chances for fog are at KGEG-KMWH-KEAT (40-70% chance; 20% higher than the HRRR chances given the anomalously high dewpoints). Confidence is low for KSFF-KCOE.
KPUW-KLWS will remain VFR with east boundary layer winds.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: There is also high confidence for fog and stratus to form into Tuesday night. Low confidence on timing and coverage.

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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 30 36 28 34 26 40 / 0 0 0 0 0 0 Coeur d'Alene 31 40 28 36 27 41 / 0 0 0 0 0 0 Pullman 34 46 30 43 28 42 / 0 0 0 0 0 0 Lewiston 34 48 32 37 31 43 / 0 0 0 0 0 0 Colville 32 37 28 36 25 42 / 0 0 0 0 0 0 Sandpoint 33 38 29 35 27 38 / 0 0 0 0 0 0 Kellogg 35 46 30 41 28 42 / 0 0 0 0 0 0 Moses Lake 30 37 29 38 27 42 / 0 0 0 0 0 0 Wenatchee 37 38 34 39 32 44 / 0 0 0 0 0 0 Omak 34 37 31 38 28 41 / 0 0 0 0 0 0

OTX WATCHES/WARNINGS/ADVISORIES
WA...Air Stagnation Advisory until 10 AM PST Friday for Central Chelan County-Northeast Mountains-Okanogan Highlands- Okanogan Valley-Wenatchee Area-Western Chelan County- Western Okanogan County.
ID...Air Stagnation Advisory until 10 AM PST Friday for Central Panhandle Mountains-Lewis and Southern Nez Perce Counties- Lewiston Area-Northern Panhandle.