A blocking ridge of high pressure is currently situated in the Eastern Pacific Coast and will slowly work toward the British Columbia Coast by late Thursday. This should push any storm systems into British Columbia and east of the Continental Divide, which will keep the Pacific Northwest high and dry with cold daytime highs and very chilly overnight low temperatures as cold air from the north rushes in. Today we can expect mostly sunny skies, light wind and afternoon high temperatures into the mid 30’s.
Wednesday and Thursday will also feature a lot of sunshine but highs will only get to around freezing. Overnight Thursday will be the coldest temperatures we have seen this season dropping down into the mid to upper teens. Friday will be a carbon copy of Thursday with daytime highs in the low 30’s under sunny skies.
By Saturday, a low-pressure trough begins to affect our weather opening up a southwest, moist flow aloft. We will see increasing clouds on Saturday with high temperatures still only in the low 30’s. The trough begins to push inland late Sunday into Monday, and that is when we will see a chance for rain or snow. We will see a 50% chance of rain or snow on Sunday and Sunday night with highs in the mid 30’s. This could be our first “snow event” in Northcentral Washington. Maybe a few leftover snow showers on Monday with highs in the upper 30’s to near 40 degrees.