textproduct: Pendleton

KEY MESSAGES

- Cooler Today

- Increasingly Breezy to Windy overnight peaking Sunday Afternoon

DISCUSSION

A combination of nighttime microphysics RGB GOES satellite and METAR data showed pockets of mostly clear conditions across the Lower Columbia Basin, but scattered to broken over most of the Blue Mtn Foothills, Cascades and eastern Mountains overnight, as the boundary layer was under a westerly and relative drier push of air. As wetter ground, colder air aloft and clouds to day influence the thermal profiles, temperatures are anticipated to be even cooler struggling into he lower 70s even across the typically warmer Lower Columbia Basin by the late afternoon. The pattern of upper troughing will continue to influence the cross Cascades pressure gradient as models converge on Sunday as a much more windy day through the gaps and Lower Columbia basin/Kittitas valley, underscored by breezy to windy conditions overnight Saturday increasing though Sunday Afternoon.

Slowly rebounding temperatures with continued westerly surface flow through much of next week before some ensembles/cluster differences of potential impact by Friday through Sunday. Cluster 4 the more potentially wet and cooler solution with a cutoff upper low along the PAC NW coast for the July 4th Holiday weekend, is also seemingly more of an outlier to the other clusters as members account for only about 11% of the total. Even adding in cluster 3 while not a closed low is also a cooler troughing lower height solution, the cooler wetter patterns account for about 30%.

AVIATION /12Z TAFS THROUGH 12Z SUNDAY/

Westerly winds will become increasingly breezy through the gaps late Today and Tonight. DLS will see gusts to around 35 knots while gusts on the order of 25 to 30 knots develop at PDT/RDM/BDN. Higher elevation showers will mainly be VFR with 6 SM vsby or better and broken cigs above 3000 ft.

FIRE WEATHER

Isolated dry thunderstorms with lightning risk is possible this afternoon in the Cascade Crest and John Day Highlands (10-20 % confidence). Other than that, limited fire weather is expected risk over the weekend as cooler weather takes hold, limiting the lower bounds for afternoon relative humidity. Westerly winds will be getting stronger through the overnight and into Sunday afternoon as relative humidity Sunday afternoon remains around 40% or higher across central Oregon and into the Columbia Basin. Isolated dry thunderstorm with lightning risk is possible this afternoon in the Cascade Crest and John Day Highlands (10-20 % confidence).

Preliminary Point Temps/PoPs

PDT 69 46 72 48 / 0 10 10 20 ALW 71 51 73 53 / 10 10 10 40 PSC 76 50 80 51 / 0 0 10 10 YKM 74 49 80 51 / 0 0 0 0 HRI 73 48 77 49 / 0 0 0 10 ELN 67 46 71 48 / 0 10 0 10 RDM 62 34 67 35 / 20 20 0 0 LGD 63 44 65 45 / 20 30 40 30 GCD 62 39 65 40 / 60 40 20 10 DLS 70 51 72 52 / 20 10 0 0

PDT WATCHES/WARNINGS/ADVISORIES

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