A shortwave weather trough is passing through the Pacific Northwest this morning. A surface low is currently situated over southern British Columbia with an associated cold front passing eastward into Idaho followed by a warm push of air behind it. With an area of low and high pressure positioned close together, winds will kick up today out of the west 10-20 mph with gusts to 25 mph. Partly cloudy skies in our forecast today with afternoon high temperatures very mild in the upper 40’s. Winds will diminish this evening.
Two weak, northwesterly shortwave weather systems will pass through the region tonight into Thursday. Expect increasing clouds throughout the day on Thursday with breezy conditions at times, highs in the upper 30’s.
For Friday, weather models remain in good agreement that a significant snow event for portions of the Inland Northwest will occur. Moderate to heavy amounts of snow are possible over the Cascades, much of north and eastern Washington and the north and central Idaho Panhandle. Here is the timeline for the upcoming storm: First Friday morning to early afternoon, a warm front comes in, with deepening moisture and lift, leading to light snow gradually increasing. From early Friday afternoon through evening the precipitation rates increase and peak as the cold front moves through. This is when localized snow rates of 1-2 inches per hour will be possible, with weather models suggesting this could be centered around the evening commute time. That timing could be a very messy situation. Friday late evening into the overnight the precipitation starts to wind down, at least briefly because toward Saturday morning another mid-level disturbance will be pivoting into Northcentral Washington. The Wenatchee Valley can expect cloudy skies Friday with a 90% chance of snow with 2-4 inches possible, highs in the mid 30’s.
Cloudy skies for Saturday as well with a 30% chance of snow, highs in the mid to upper 30’s.
For Sunday, Monday and Tuesday, we will see mostly cloudy skies with a 20-30% chance of snow Sunday and Monday with highs both days in the mid 20’s to lower 30’s. A strong cold front moves through Monday as well with overnight lows Monday night in the lower teens. Some parts of Washington will see only single digits for highs and possibly below zero for overnight lows next week