Weather 9-29-20

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No significant changes have been made to the weather forecast for the next several days. A high amplitude ridge/trough pattern has been established over North America and will remain in place through at least the weekend and into early next week. The western United States will experience a prolonged period of warm and dry weather under strong high pressure while the central and eastern states will be under the influence of a cool trough. Under sunny skies today, Northcentral Washington can expect very light wind with high temperatures warmer, into the upper 70’s.

We will also be keeping an eye on the plume of smoke generated by the current California wildfires. The smoke model brings mid and high level smoke up the coast today and across Washington state on Wednesday. At this time, the model keeps much of the smoke aloft roughly 5000-6000 feet above the surface. This scenario suggests that our skies will become milky or grey through the day Wednesday into Thursday. How much smoke mixes down to the ground is unclear at this time, but a repeat of the terrible air quality we had earlier this month is not anticipated. The active fires are further away and collectively producing less smoke.

The Columbia Basin and Wenatchee Valley will see mostly sunny skies on both Wednesday and Thursday but hazy with afternoon high temperatures in the low to mid 80’s.

Very little, if any, change to the weather forecast for Friday and right through the weekend. Under sunny skies, afternoon high temperatures will remain 10-15 degrees above normal through early next week with only a few high clouds streaming overhead Sunday associated with a weak upper level disturbance.

Given the stable weather pattern, smoke or haze may be apparent during this time frame too. We`ll have a better idea of smoke impacts in a few days as the smoke from California arrives. Whatever arrives has a good chance of sticking around through the first week of October.