A large, strong area of high pressure continues to dominate our weather picture today through Wednesday but, will begin top break down by the end of the week. The flow will remain out of the northwest with any additional weather disturbances mainly east into Montana. This will continue the dry weather pattern across Northcentral Washington with strong morning inversions and cold temperatures. The main impact has been the poor mixing under the inversion and the Air Stagnation Advisory will continue through at least Tuesday, but likely extended further into the week.
Expect sunny skies both today and Tuesday with afternoon high temperatures in the mid to upper 50’s. The ridge of high pressure will continue to bend down allowing a back door cold front to move through Southeast Alberta and Southwest British Columbia. The majority of the Inland Northwest will see little affect front this front.
Partly cloudy skies for Wednesday with highs in the mid 50’s. Cloudy skies for Thursday and Friday as the high pressure ridge axis remains off the coast. The ridge axis then moves inland Thursday and weakens allowing for a more zonal flow dirtied with moisture and weak disturbances either moving through the flow or overtopping it through Friday. Afternoon high temperatures Thursday and Friday in the mid 50’s.
A synoptic sized weather system is expected to push down on the back side of the ridge as it moves through Saturday. Mostly cloudy and mild for both Saturday and Sunday with a 20% chance of widely scattered showers, afternoon high temperatures in the upper 50’s.