A trough of low pressure along the coast is expected to deepen throughout the day and allow a low to move in along the coast of Washington. Northcentral Washington can expect mostly cloudy skies and mild with a 50% chance of showers and afternoon thunderstorms with high temperatures today near 80 degrees. The timing of the storms is expected to be early afternoon and carry into to the early evening. The main threat with the storms will be the lightning and gusty winds. Small hail is also a possibility with these storms.
For overnight, mid-level moisture will continue to increase and bring weak instability across the region. Rain showers are expected for the overnight period for the most of the region.
On Friday, the trough will slowly begin to slide inland bringing a 50% chance of mainly showers, a bit breezy too, 5-15 mph with afternoon highs tomorrow in the upper 70’s to near 80 degrees. For Saturday and Sunday, low pressure and an associated trough will remain across the Pacific Northwest. This will keep our weekend cool and unsettled. We will see temperatures drop 10-25 degrees compared to Friday temps. Mostly cloudy skies on tap for Saturday with a 20% chance of isolated showers, northwest wind 10-15 mph with afternoon highs in the only in the upper 60’s.
Expect partly cloudy skies on Sunday and breezy with winds 10-20 mph across the Columbia Basin, Waterville Plateau and the Wenatchee Valley.
For Monday through Thursday weather conditions remain cool and unsettled as another trough of low pressure will move through the region. Temperatures will warm a few degrees, but still be below average for this time of year. The best chance for showers will be each afternoon and early evening, with the Columbia Basin and Wenatchee valley likely to remain dry, high temperatures in the lower 70’s.