High pressure persists in the Pacific Northwest through Saturday and warmer weather will continue through Monday with temperatures gradually cooling Sunday and Monday and much cooler next week as a an upper-low settles over the region. The warm temperatures this weekend will provide the instability for afternoon thunderstorms, mainly in the Cascades, but a thunderstorm or two could carry over into the basin. The best chance for thunderstorms will be Sunday afternoon when the upper low moves in and provides more moisture to the region; some thunderstorms on Sunday could make it into the valley but at this time it’s still a slight chance. If headed out this weekend be prepared for conditions to change quickly as the weekend, for the most part, will be warm sunny and dry…until those thunderstorms form.
Next week the upper-low will start to bring much cooler weather, similar to what we saw this week, and spotty showers mainly Tuesday and Wednesday and most will stay in southern Oregon with only a few going as far south as Siskiyou county.
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Meteorologist Megan Parry