A broad and cold upper level trough of low pressure is digging into the northwestern U.S. this morning. The deep basin, Wenatchee Valley and the lee side of the Cascades will benefit from a precipitation shadow today for only scattered flurries. the main issue for these areas will be biting wind chills with the Okanogan Valley being the conduit for the cold dense modified Arctic air to invade the basin. The Wind Chill Advisory through noon here looks on track with wind chill readings in Omak this morning around -30 degrees.
Overnight low temperatures will be the weather news of the day on Wednesday morning with most locations except plunging into the single digits above zero and some protected northern valleys possibly diving below zero. It looks like tonight will bring the coldest temperatures of the current cycle.
An offshore weather system moves through Northcentral Washington on Wednesday afternoon with a 60% chance of snow and still cold with afternoon high temperatures in the lower to mid-20’s. There is also a 60% chance of snow overnight Wednesday with lows in the upper teens.
A warm front replaces the cold arctic air in place on Thursday with a 30% chance of snow, highs will climb back to normal into the lower 30’s.
Cloudy skies for most of the day on Friday with a 50% chance of snow Friday evening with highs once again in the lower 30’s. As for the weekend and into early next workweek weather models favor warm trajectory of approach from the southwest and west and depict yet another low pressure system sweeping through the region Saturday/Sunday.
Expect a 70% chance of snow on Saturday with high temperatures in the mid to upper 30’s.
Warmer for Sunday and Monday with just isolated snow showers, afternoon highs in the upper 30’s to near 40 degrees with overnight lows in the upper 20’s.