textproduct: Pendleton

KEY MESSAGES

- Continued drying pattern tonight through the weekend.

- Wetter pattern returns early next week with increased PoP chances of rain and mountain snow.

- Hydrologic concerns ease, but 'bank full' at certain points remain in the Yakima and Naches Rivers.

DISCUSSION

Radar shows dry conditions across the region with satellite displaying high cloud ceilings with FEW-SCT coverage. The dry pattern is forecast to continue tonight and through the weekend (>90% chance) as a ridge continues to build over the PacNW. High temperatures continue to trend warmer through Sunday in the mid to high 60s in the lower elevated areas. METAR surface observations are observing weaker winds from earlier, but a few 15-25 mph gusts linger in the Columbia Basin before decreasing further overnight.

Deterministic guidance has high confidence that a much wetter/cooler pattern will emerge as a trough develops in the Gulf of Alaska region through mid-week and pushes through the region. An embedded cold front will develop and sweep the region sometime Monday morning, increasing PoP chances. The system is likely (60-80% chance) to be more rain dominated with snow levels 4000-5000 feet. After the cold front passage, snow levels in the Washington Cascade region will drop to around 2000-3000 feet, allowing for snow showers to develop, albeit at light to moderate rates. Precipitation overall is forecasted to be light with pockets of moderate precipitation possible, with Wednesday eyeing to be the wettest day next week. Overall, not seeing anything at this point that would point to any hydro concerns. Certain areas in the Naches and Yakima River in the Kittitas region are expected to remain in 'bank full' over the next several days. Will need to monitor any QPF trends as it's still uncertain whether this could briefly put any of these rivers back in 'Minor' flooding. Otherwise, not seeing anything that would need any weather highlights at this point.

AVIATION /12Z TAFS THROUGH 12Z FRIDAY/

VFR conditions prevail with light and variable winds through the night. PDT will see slightly stronger 10-15 mph winds over the next several hours. Dry pattern will keep VIS and CIG levels P6SM and >3500 feet through the forecast period. Not expecting and sub- VFR conditions over the next-24 hours.

Preliminary Point Temps/PoPs

PDT 52 29 59 35 / 0 0 0 0 ALW 52 33 60 39 / 0 0 0 0 PSC 57 29 62 36 / 0 0 0 0 YKM 53 30 58 35 / 0 0 0 0 HRI 56 28 61 34 / 0 0 0 0 ELN 49 27 54 32 / 0 0 0 0 RDM 53 23 67 30 / 0 0 0 0 LGD 49 26 61 34 / 0 0 0 0 GCD 51 28 67 34 / 0 0 0 0 DLS 58 33 62 38 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

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