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This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

KEY MESSAGES

- Breezy diurnal winds through Saturday.

- Enhanced Fire weather concerns on Saturday.

- Warming and drying through next week.

DISCUSSION

Zonal flow is expected over the region through Saturday, then the flow will become more southwesterly. As a result, temperatures are expected to warm, peaking Monday and Tuesday before decreasing.

Highs on Monday and Tuesday will be into the 90s in most lower elevation locations, with the Columbia Basin in the mid to upper 90s, and 100 degrees can not be ruled out. These temperatures will be about 10 to 15 degrees above normal. After Tuesday, temperatures will return to closer to normal values.

There will be breezy afternoon winds through Saturday, in the 25 to 35 mph range across the Kittitas Valley, Simcoe Highlands and portions of the Columbia Basin and Gorge. These winds, coupled with RH values generally in the teens on Saturday will create enhanced fire weather concerns and a fire weather watch has been issued for portions of the lower Columbia Basin of Oregon (zone OR691) and we will have to monitor to see if any additional watches or warnings are needed in other areas.

In the southwesterly flow, Sunday into Monday there is a low (<20 percent) chance of showers and thunderstorms, mainly over the mountains of eastern Oregon. If there is enough lightning, these locations will have to be monitored as well for fire weather headlines.

By Wednesday, the flow becomes more westerly once again. Winds will increase, especially across the Oregon Basin but with cooler temperatures, RH values will also be higher, but once again, will continue to monitor these areas.

AVIATION /12Z TAFS THROUGH 12Z SATURDAY/

VFR conditions with winds 10 kts or less are expected through the TAF period at all sites except DLS. At DLS, afternoon and evening wind gusts to around 25 kts are anticipated once again.

Preliminary Point Temps/PoPs

PDT 85 54 88 53 / 0 0 0 0 ALW 86 60 89 58 / 0 0 0 0 PSC 89 57 92 56 / 0 0 0 0 YKM 88 56 91 54 / 0 0 0 0 HRI 88 58 91 56 / 0 0 0 0 ELN 83 53 83 51 / 0 0 0 0 RDM 86 48 88 48 / 0 0 0 0 LGD 85 53 88 53 / 0 0 0 0 GCD 87 51 92 52 / 0 0 0 0 DLS 86 57 87 57 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

WA...None. OR...Fire Weather Watch from Saturday afternoon through Saturday evening for ORZ691.

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