A potent west to northwest jet stream will become draped across southern British Columbia today and will remain close to the International border through the next few days. A pair of deep low-pressure systems slinging to the east just north of the jet will pass through Central Alberta before dropping into Southern Saskatchewan. South of the jet, a persistent cool maritime high will exist along the coast and the pressure gradient packing between these features will maintain a steady pressure gradient across the forecast area. This will result in breezy to windy conditions for the next several days, especially in the Columbia Basin.
Weather forecast for Northcentral Washington today calling for partly cloudy skies, a west wind 10-15 mph with afternoon highs today mainly in the mid 50’s.
Just as the low-pressure system departs to the east Tuesday morning, the next low will track into Western Canada and drop into Alberta-Saskatchewan Tuesday night into Wednesday. Expect mostly cloudy skies for Tuesday and a bit breezy with a 30% chance of mainly evening rain showers with afternoon highs in the upper 50’s.
This low will nudge the jet further south and will continue to tighten the pressure gradient resulting in a slightly stronger wind event on Wednesday compared to Monday-Tuesday. Widespread gusts of 30-40 mph will be common across the Basin and other windy areas mentioned above. Once again, there will remain a small potential for breaking mountain waves in the lee of the Cascades and particularity on the Waterville Plateau and foothills between Wenatchee and Chelan with high temperatures Wednesday in the lower to mid-50’s. Gusty winds should quickly subside Wednesday evening.
Then on Thursday weather models continue to show good agreement that a surface area of high pressure will quickly build in to our area. The Wenatchee Valley can expect partly to mostly cloudy skies on both Thursday and Friday with afternoon high temperatures in the mid 50’s.
A slow-moving weak trof of low pressure will slide through on Saturday bringing with it a 20% chance of widely scattered showers with highs in the lower 50’s. On Sunday, partly cloudy skies will prevail with high temperatures to end our weekend in the lower 50’s.