textproduct: Pendleton

KEY MESSAGES

- Friday looks breezy over the foothills of Northern Blues, Wallowa Mountains and their respective valleys.

- Saturday in conjunction with a shortwave will bring breezy conditions through the Gorge and Columbia Basin.

DISCUSSION

Benign weather through the day today. Mid and upper-level water vapor bands show clouds pushing into our Washington portion of our CWA. TAF sites that are encompassed in those clouds, overnight lows could be warmer than the rest of the region. A cutoff upper-level low is centered over lower Nevada and Arizona and is deepening while the ridge flow becomes zonal over the PNW. Next couple of days the low will begin to lift and transition us into a stronger ridge.

Short term with ridging over the CWA, temperatures will rise 10-15 degrees above climate norms. While our temperatures are rising over the week, overnight chances of sub-freezing temperatures in our lower valleys still remain in the 70-90% range of probability. Those areas where freezing is likely to occur are ineligible for freeze warnings.

Friday models are showing a tightening of the pressure gradients through the Grande Ronde Valley due to a pressure gradient between the Columbia Basin and the Treasure Valley. In office calculations show a tightening of nearly 7 mb and wind direction will be from the southeast. NAM and RRFS are suggesting breezy conditions along the foothills of the Northern Blues, Wallowa Mountains and their respective valleys. NBM probabilities for greater than 30 MPH at this time hover around 95%.

Looking ahead towards the weekend, models are suggesting a few weak shortwaves moving through the flow. Clusters are in good agreement that a shortwave is going to move through with slight variance in amplitude which will effect any amount of precipitation and bring breezy conditions. Saturday the shortwave moving across our region will aid in bringing more breezy conditions through Gorge and Columbia Basin. Early next week alongside the pattern change will be the best chances rain.

Preliminary Point Temps/PoPs

PDT 64 36 68 37 / 0 0 0 0 ALW 65 41 69 41 / 0 0 0 0 PSC 67 34 71 36 / 0 0 0 0 YKM 65 39 70 41 / 0 0 0 0 HRI 66 36 70 38 / 0 0 0 0 ELN 62 35 67 37 / 0 0 0 0 RDM 66 27 69 30 / 0 0 0 0 LGD 63 31 68 34 / 0 0 0 0 GCD 64 33 70 37 / 0 0 0 0 DLS 70 41 74 45 / 0 0 0 0

Preliminary Point Temps/PoPs

PDT 68 35 69 38 / 0 0 0 0 ALW 67 38 69 44 / 0 0 0 0 PSC 70 35 71 35 / 0 0 0 0 YKM 70 40 70 39 / 10 0 0 0 HRI 69 36 69 35 / 0 0 0 0 ELN 68 38 66 37 / 10 0 0 0 RDM 68 28 74 31 / 0 0 0 0 LGD 67 34 70 40 / 0 0 0 0 GCD 67 34 75 37 / 0 0 0 0 DLS 75 45 74 43 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

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