596 FXUS66 KOTX 160600 AFDOTXArea Forecast Discussion National Weather Service Spokane WA 1100 PM PDT Mon Sep 15 2025
.KEY MESSAGES...
- Breezy easterly winds tonight into Tuesday across the Cascades.
- Warm and dry Tuesday through the end of the week.
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.SYNOPSIS... Breezy easterly winds across the Cascades Monday night into Tuesday. High pressure over the region with a warm and dry conditions through the work week.
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.DISCUSSION... Monday afternoon through Tuesday: As an upper-level ridge of high pressure continues to build over the Inland Northwest, clouds will clear from west to east and lingering showers over North ID will subside. Meanwhile at the surface, breezy easterly winds (sustained speeds 10-15 mph, gusts 20-30 mph) will pick up across the Cascades Monday night into Tuesday as a thermally-induced surface trough develops over western WA. Outside of Central WA/the Cascades, winds will remain light. For locations including northeastern WA and North ID that received several tenths of rain on Sunday, light winds combined with clearing skies Monday night will likely mean fog development in sheltered valleys overnight into Tuesday morning. Tuesday afternoon will be notably warmer than Monday particularly for far eastern WA and the ID panhandle with the ridge axis centered over the Inland Northwest and no cloud cover to moderate temperatures. Locations in the Columbia Basin can expect temperatures to warm by around 10 degrees, while places along and east of the ID border will see temperatures 15 to 20 degrees warmer than on Monday.
Wednesday through Sunday: Temperatures will stay relatively consistent in the mid to upper 80s through the end of the workweek until our next trough moves in heading into next weekend cooling temperatures closer to climatologically normal values in the low to mid 70s. In addition to cooler temperatures, the trough is also likely to bring breezy winds and returning chances for precip. /Fewkes
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.AVIATION... 06Z TAFS: Stratus has cleared from the TAF sites with VFR conditions. Fog has developed in the Boundary County airport and is expected to expand across the northeast Washington and north Idaho valleys through Tuesday morning. Residual boundary layer moisture and decreasing winds may allow for shallow fog development at KGEG/KSFF/KCOE but confidence was not high enough to include reductions below VFR in the TAFs. General winds will remain out of the east to northeast through the day with afternoon gusts 15-20kt at KPUW.
FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence in VFR conditions through the TAF period. There is a 10% chance for MVFR conditions at KCOE between 10-15Z, but confidence is too low to include in the TAF.
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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:/weather.gov/otx/avndashboard
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.Preliminary Point Temps/PoPs... Spokane 49 82 54 87 54 87 / 0 0 0 0 0 0 Coeur d`Alene 50 84 55 86 55 88 / 0 0 0 0 0 0 Pullman 45 79 51 84 51 85 / 0 0 0 0 0 0 Lewiston 52 84 58 88 59 89 / 0 0 0 0 0 0 Colville 40 82 44 86 44 87 / 0 0 0 0 0 0 Sandpoint 46 81 50 84 49 85 / 10 0 0 0 0 0 Kellogg 51 80 56 84 58 86 / 0 0 0 0 0 0 Moses Lake 51 84 51 87 53 88 / 0 0 0 0 0 0 Wenatchee 56 81 58 86 61 87 / 0 0 0 0 0 0 Omak 53 85 56 88 57 88 / 0 0 0 0 0 0
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.OTX WATCHES/WARNINGS/ADVISORIES... WA...None. ID...None.
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NWS OTX Office Area Forecast Discussion