textproduct: Pendleton

DISCUSSION

A warming pattern will continue into the end of the workweek as an offshore ridge axis amplifies and builds inland, bringing subsidence and benign sensible weather. Forecast high temperatures continue to trend higher through the 70s and 80s by the end of the week with limited HeatRisk of Level 1 which affects the most vulnerable to heat who also have no cooling or hydration. A backdoor surface cold front will be driven southwest across the region Wednesday night through Thursday morning, driven by an associated mid level shortwave just east of the region, flipping winds out of the northeast but having little impact on the warming trend into Thursday afternoon other than muting how warm the afternoon temps jump from the previous day.

The day 7, the ensembles hint synoptic pattern developing an upper trough over the PAC NW, leading to cooler and wetter conditions May 26-27. Clusters 1-3 are in reasonable pattern agreement, with cluster 4 showing an alternative scenario and a 5% outlier placing a warm dry ridge over the region. The leadup to this may bring enhanced winds in the gaps areas over the weekend as the westerly winds return with strongest winds with potential for wind advisories over the usual windy spots like Kittitas Valley, Eastern Columbia River Gorge and the the Blue Mountain foothills.

AVIATION /18Z TAFS THROUGH 18Z THURSDAY/

VFR conditions will persist through the forecast period. CIGs will be mostly FEW/SCT 25 kft with light winds below 10 kts except at DLS where winds will be 10-15 kts. 90

Preliminary Point Temps/PoPs

PDT 73 45 75 47 / 0 0 0 0 ALW 73 48 76 50 / 0 0 0 0 PSC 78 50 80 49 / 0 0 0 0 YKM 79 49 80 51 / 0 0 0 0 HRI 76 48 79 48 / 0 0 0 0 ELN 73 44 75 47 / 0 0 0 0 RDM 73 39 77 41 / 0 0 0 0 LGD 70 41 73 42 / 0 0 0 0 GCD 73 39 75 39 / 0 0 0 0 DLS 77 50 82 53 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

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