FXUS66 KPDT 051119 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 319 AM PST Thu Nov 5 2026 .KEY MESSAGES... 1. Pattern shift Thursday will bring mountain rain showers today and Friday 2. Low elevation conditions will remain dry through the weekend 3. Breezy conditions through the weekend && .DISCUSSION... Current radar is showing a line of precipitation crossing over the region. Current ground observations are showing light rain through Pendleton and Pasco and heading eastwards towards Walla Walla. Once this line of showers passes the region will be back under mostly dry conditions for the lower elevations while the Cascades will receive more rain showers. Temperatures today will be in the low to mid 50s across the vast majority of the region. Models show an upper level shortwave trough moving into the region bringing with it chances of mountain showers today (Thursday). 80- 90% of the REFs raw ensembles shows the Cascades will receive up to 0.05 inches of precipitation in 24 hours while the Blues and eastern mountains will see 0.01-0.04 inches in 24 hours. Snow levels will remain above 5500 feet some the precipitation will fall as rain along the Cascades and the Blues. Friday models show much of the precipitation to remain locked against the Cascades, primarily along the WA Cascades. 24 hour precipitation based off of the NBM raw ensembles shows 60-80% probabilities of 0.15-0.20 inches of rain possible Friday. After the system passes on Thursday, deterministic models are in form agreement with a zonal flow pattern setting up across the region. This will dry the region back out and allow the temperatures to steadily increase through Saturday. In house climate calculations show that by Saturday temperatures will be 10-15 degrees above seasonal normal. NBM ensembles show temperatures to be in the low to mid 60s by Saturday with a few isolated locations seeing the high 60s with 70-80% of the NBM raw ensembles in agreement. As we move into the weekend, models show the next system to be making is way onshore. Clusters do show there to be a timing difference with the arrival of the next system, however, models are in agreement with precipitation along the Cascades as well as an increase in the winds across the region. The area with the highest winds will be through the Grande Ronde Valley Saturday with winds between 25-30 mph with 70-90% probabilities. && .AVIATION /12Z TAFS THROUGH 12Z FRIDAY/... MVFR conditions at DLS/YKM/PSC currently due to fog and light rain. This is expected to clear to VFR after 14-16Z. The remaining sites are VFR and are expected to remain as such through the period. There is a 30-50% probability that ALW will see a brief period of below 10 miles VIS as the system moves overhead after 12Z. Winds will be light an variable through the period remaining below 10 kts. && .Preliminary Point Temps/PoPs... PDT 55 32 57 38 / 20 0 0 0 ALW 54 37 56 44 / 50 0 0 10 PSC 59 31 56 35 / 10 0 0 20 YKM 58 32 55 36 / 0 0 10 30 HRI 59 30 55 35 / 0 0 0 10 ELN 53 26 50 32 / 0 0 20 30 RDM 53 24 61 29 / 0 0 0 0 LGD 52 31 55 38 / 60 0 0 0 GCD 52 30 60 32 / 10 0 0 0 DLS 59 36 58 41 / 0 0 0 20 && .PDT WATCHES/WARNINGS/ADVISORIES... WA...None. OR...None. && $$ DISCUSSION...90 AVIATION...90