Our weather today will feature weak high pressure that will begin to nose into Central Washington today but by large, there will be very subtle changes in the air mass over Northcentral Washington. For some, today will also be another day of convection which will fire up over the mountains and have the potential to drift into the Columbia Basin, Wenatchee Valley and the Waterville Plateau late in the afternoon and throughout the early evening. The main threats with storms will remain small hail, torrential downpours, and outflow winds of 25-35 mph. Storms also have had a history of producing occasional to frequent lightning. Afternoon highs will be near to possibly a degree or two warmer than Thursday with temperatures in the upper 80’s to near 90 degrees.
For Saturday, our upper-level weather flow will begin to flatten and this will lead to a warmer and more stable atmosphere over Northcentral Washington. We will see sunny skies tomorrow with very light west winds and afternoon highs in the 80s with a few low 90s possible across the Basin and Highway 97 corridor between Omak and Wenatchee.
After any lingering thunderstorm activity from Saturday evening dies off, the forecast area will enter into a dry weather period from Sunday through at least next Wednesday. The current warm and moist air mass with afternoon and evening instability will be replaced by a more progressive flow pattern.
A zonal flow aloft will open up the opportunity for weak but dry cold fronts to moderate temperatures back to merely a little above normal in the upper 70s to lower 80s as opposed to the recent mid to upper 80s. This progressive weather pattern will bring breezy conditions at times most notably on or about Monday. Expect Sunny skies each day Sunday through Thursday of next week with highs on Monday in the mid 80’s, lower 80’s for Tuesday and Wednesday with afternoon highs by Thursday down into the mid 70’s.