A big weather change is expected today into Friday as satellite imagery is showing a strong and deep Gulf of Alaska trough digging aggressively eastward just off the British Columbia coast. The associated area of low pressure is pushing a large wave of moisture ahead of it. We have a 50% chance of rain showers developing this afternoon, which goes up to a 100% chance of rain mixed with snow showers tonight. This weather system is called a closed low, which means it is cut off from other weather features. This pattern usually sets up a long period of moist southerly flow into the forecast area.
With that in mind, we will also see an 80% chance of rain and snow on Thursday and a 60% chance of a wintry mix on Friday. Mainly rain is expected for the Wenatchee Valley over this forecast period but we may have accumulating skiffs of snow at times. We do have a winter weather advisory for some locations in our area from 4:00 this afternoon until 10:00 Thursday morning. Most of the real snow will be in the mountains where up to a foot of snow is possible and into eastern Washington where Spokane could pick up 2-6 inches of new snow.
Our weather quiets down on Saturday and into the weekend as high- pressure builds in bringing mostly sunny skies and light wind with highs this weekend and early next week in the mid to upper 40’s.