textproduct: Pendleton

KEY MESSAGES

- Diurnal breezes expected much of this week, with Tuesday and Saturday being the windiest days.

- Quiet weather for the upcoming week.

DISCUSSION

Dry southwesterly flow will continue over the Pacific northwest around the periphery of high pressure over the mid section of the country. A weak frontal boundary will move through on Tuesday. The high will move westward toward the four corners by the end of the week, coupled with low pressure moving into western Canada, will allow for the flow to become more westerly.

There is little expected in the way of sensible weather this week.

Diurnal breezes are expected almost every day, with Tuesday and Saturday being the windiest days. A weak front on Tuesday will bring an increase in winds, mainly across the Cascade gaps, Columbia Basin, Gorge and Kittitas Valley. Winds will gust in the 25 to 30 mph range in these areas. Probabilities are 50 to >90 percent in these area of wind gusts >=25 mph, however probabilities decrease to only a few spots >=50 percent for wind gusts >=39 mph.

However, humidities will also be a bit higher ahead of the front before coming back down behind it.

The rest of the week looks to have lighter winds until Saturday, when the combination of the high pressure moving westward and low pressure moving into Canada will tighten the pressure gradient. Additionally there will be another frontal boundary moving through. All of these combined will increase winds across the normally breezier locations to 25 to 25 mph, with some locally higher gusts. NBM probabilities of wind gusts >=25 mph are above 80 percent across almost all of out region.

NBM probabilities of wind gusts >=39 mph are >=50 percent across the Basin, Gorge Kittitas Valley, Foothills of the Blue Mountains and Simcoe Highlands. Depending on timing, this could be the next time frame of critical fire weather conditions.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

Generally VFR conditions anticipated. Brief periods of MVFR due to smoke/haze cannot be ruled out, but specifying impacted terminals remains a challenge. Winds will see an uptick this afternoon across KDLS, KRDM, KBDN with gusts up to around 25 kts, otherwise winds will be 12 kts or lower. Branham/76

Preliminary Point Temps/PoPs

PDT 88 57 87 55 / 0 0 0 0 ALW 90 63 90 60 / 0 0 0 0 PSC 92 61 92 57 / 0 0 0 0 YKM 91 59 89 56 / 0 0 0 0 HRI 91 61 90 58 / 0 0 0 0 ELN 84 56 81 52 / 0 0 0 0 RDM 88 50 87 49 / 0 0 0 0 LGD 90 56 89 55 / 0 0 0 0 GCD 92 54 92 54 / 0 0 0 0 DLS 88 62 84 59 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

WA...Air Quality Alert until 11 AM PDT this morning for WAZ028>030. OR...Air Quality Alert until noon PDT Wednesday for ORZ041-044-049- 050-502-503-505>511.