textproduct: Pendleton

AVIATION

Another period of rains ramps up across the area by sunrise. Lower visibility would be found at KDLS as the HRRR shows the highest precipitation hourly rates in that area from about 18z or so, and into the afternoon. While higher rain rates are going to be right along the Cascade Caps locations like Bend and Redmond are unlikely to get sustained ceilings down in the IFR category (70-90% confidence). Farther north, YKM, however has about a 50% chance of seeing ceilings below 1000 ft after about 16z.. Overall lighter rain rates are expected in the eastern terminals with rain starting around 13z an ending around 21z. Russell/71

PREV DISCUSSION

/issued 240 PM PST Sat Dec 6 2025/

DISCUSSION...

Key Points:

1. Wet pattern continues through the weekend

2. Winds will return Monday night into Tuesday

3. Continued wet pattern with increasing temperatures

Winds are still a bit breezy across some areas across the CWA, but remain below advisory criteria. Current radar shows some linger showers continuing over the crests of the Cascades with little spill over to the eastern slopes. Current satellite imagery shows the cast majority of the area to be partly to mostly sunny. However, the sunshine will be short lived as the next incoming round of precipitation makes its way into the region tonight.

Tonight through Monday...Partly to mostly sunny skies will give away to mostly cloudy and overcast as we continue to move through the evening and into the overnight period. Precipitation will be pinned to the Blues and the Cascades to start but will become widespread this after 4AM. Models show QPF amounts to be elevated along the higher elevations and along the eastern slopes before tapering of slightly as we head towards the eastern portion of the CWA. Models show rain to be continuous through Sunday with 24 hour precipitation totals nearing wetting rain amounts of near 0.10-0.20 across portions of the Basin, foothills of the N & S Blues and through north central OR (70-90%). The eastern mountains, Highlands and eastern slopes will see between 0.30 inches along the lower slopes (60-80%) to near 1 inch around the crests (70-90%). Models are firm agreement with yet another round of frontal systems impacting the NW. Monday will be another soggy day with models showing even higher amounts of precipitation, especially along the foothills of the Blues and eastern slopes of the Cascades. 70-90% of the raw ensembles show the crests of the Cascades could see nearly 2-3 inches of rainfall in 24 hours Monday. 30-50% for 0.90-1.20 inches along the crests of the Blues and 70-90% for 0.10-0.20 inches elsewhere.

Not only will Monday bring another round of wetting rains, but also another round of breezy to windy conditions across the region Monday night. Raw ensembles show the primary locations of sustained winds of 30-35 to be along the Simcoe Highlands, foothills of the southern Blues (40-60%) and the foothills of the N. Blues of WA (70-90%). The associated gusts will be highest along the ridgetops of the aforementioned areas with raw ensembles showing (70-90% confidence) in the aforementioned areas seeing gusts of 40-45mph. This is below wind advisory criteria at this time and will be closely monitored as Monday draws nearer.

Tuesday onwards...Models continue to be in agreement with a significant amount of rainfall expected over the course of the week. NBM QPF amounts are relatively high, especially across the mountain tops. Models even show the lower elevations could see near 0.15-0.25 inches of rain Tuesday (45-70%), (50-70%) again Wednesday before tapering off to 0.05-0.1 inches Thursday. As for the mountains, raw ensembles show (70-90%) for 1 inch or more Tuesday, (60-80%) Wednesday and (50-70%) Thursday. Through the bulk of the next week, snow levels are then forecast to remain high at mostly 5-8 kft with periodic dips to 4.5 kft so much of the precipitation expected will indeed fall as rain. With that in mind there are some concerns about rises on area rivers. Current forecasts from the NWRFC in Portland do place multiple rivers at action stage or minor flood stage by the latter half of next week. 90

AVIATION...00Z TAFS...Mostly VFR conditions forecast through the period. CIGs and vsby will stay VFR through late this evening and early tonight, but an incoming system will bring lowering CIGS of sct to ovc down to around 2kft to 6kft by tomorrow morning at all sites. Precipitation associated with the incoming system will start around 10Z for RDM/BDN/DLS but be fairly light at sites RDM/BDN, and between 13Z-15Z for sites PDT/YKM/ALW/PSC. Heavier precip at site DLS may reduce vsby to 3 to 5 miles. Precipitation will last for several hours at each site with end times around 15Z at sites RDM/BDN, and 18-20Z at sites DLS/PDT/YKM/PSC. Site ALW will see light rain impacts persist after 18Z. Breezy winds will continue into the early evening, then become 12kts or less through the remainder of the period...except at sites BDN/ALW where winds 12-17kts with gusts to around 25kts will redevelop around or after 15Z(BDN) and 18Z(DLS). Lawhorn/82

PRELIMINARY POINT TEMPS/POPS

PDT 41 54 43 58 / 30 90 60 80 ALW 42 51 45 57 / 40 90 70 90 PSC 42 56 44 59 / 20 80 30 70 YKM 36 53 37 55 / 30 80 30 80 HRI 42 56 43 60 / 20 90 40 70 ELN 34 47 34 49 / 40 80 40 80 RDM 33 55 37 57 / 30 50 40 50 LGD 35 45 38 49 / 60 90 80 90 GCD 34 48 38 52 / 40 90 50 70 DLS 46 56 47 60 / 80 100 80 90

PDT WATCHES/WARNINGS/ADVISORIES

OR...None. WA...None.