textproduct: Pendleton

KEY MESSAGES

- Generally quiet weather for this week.

- Diurnal breezes for much of this week, with today Tuesday and Saturday having the best chances for gusty winds.

- Elevated fire weather concerns will continue due to breezy winds and low RH.

DISCUSSION

The Pacific Northwest will be in dry southwesterly flow for much of the week as the area is between high pressure to the southeast over the southern plains/four corners and low pressure near the Gulf of Alaska.

For today, breezy winds are expected to continue behind the passage of the cold front yesterday. However, wind gusts should be less than they were on Saturday, mainly in the 20 to 25 mph range, with some gusts as high as 30 mph. These higher gusts should be confined to the normally breezier locations such as the Cascade gaps, Columbia Basin and Gorge and Simcoe Highlands. NBM probabilities of wind gusts >=25 mph are fairly high, generally >70 percent. However, wind gusts >=39 mph are low, generally 40 percent or less. Elevated fire weather conditions are expected, but at this point fire weather headlines are not anticipated.

Winds will decrease on Monday. before a weak cold front moves across the region on Tuesday. This will cause another increase in wind (and RH). Winds will gust 20 to 25 mph, possibly as high as 30 mph again. NBM probabilities are a little higher than today, for localized area of wind gusts >=39 mph with probabilities as high ad 50-80 percent, but RH values are also higher as stated earlier. Will have to monitor Tuesday for any headlines, but looks marginal at this time.

By Saturday, the flow will become more westerly as low pressure moves into British Columbia and the pressure gradient increases. Exactly how this plays out a week away remains to be seen, but this could be another breezy to windy day.

Temperatures should warm through the week, before possibly decreasing over the weekend as the flow becomes more zonal. Highs should reach the low to mid 90s once again as the ridge in the mid-section of the country moves towards the four corners.

AVIATION /06Z TAFS THROUGH 06Z MONDAY/

VFR conditions are expected through the TAF period. However, some MVFR can not be ruled out due to smoke, most likely at BDN or RDM but possibly anywhere.

Afternoon wind gusts to around 20 kts are expected at DLS, PDT, BDN and RDM, with gusts to 15 kts elsewhere. All sites should decrease to 10 kts or less during the evening and remain 10 kts or less on Monday.

Preliminary Point Temps/PoPs

PDT 88 55 88 57 / 0 0 0 0 ALW 90 61 90 63 / 0 0 0 0 PSC 92 60 92 61 / 0 0 0 0 YKM 90 58 91 59 / 0 0 0 0 HRI 91 60 91 61 / 0 0 0 0 ELN 84 54 85 55 / 0 0 0 0 RDM 88 50 88 50 / 0 0 0 0 LGD 92 56 91 56 / 0 0 0 0 GCD 93 54 92 55 / 0 0 0 0 DLS 86 60 88 61 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

WA...Air Quality Alert until 11 AM PDT Monday for WAZ028>030. OR...Air Quality Alert until noon PDT Monday for ORZ049-050-502-503- 505-506-508-509-511.