We are moving into a critical weather pattern across Northcentral Washington with near record high temperatures, breezy conditions, and increasing chance of thunderstorms midweek. A large ridge of high pressure is well east of the Inland Northwest but, a Gulf of Alaska trof is deepening as it dives toward the coast. That trof will help amplify the ridge as it retrogrades back toward the inter-mountain west and brings us hot conditions through the end of the week. A heat advisory is still in place until Friday night for almost all of Northcentral Washington.
Under sunny skies, the main focus today will be breezy late-day/early evening winds and elevated fire weather concerns during the day. Winds out of the Cascade gaps will increase late morning and be hot and blustery through the early evening hours. The Wenatchee Valley can expect sunshine and a northwest wind around 10 mph with hot afternoon high temperatures near 100 degrees.
Wednesday will be dry and a literal duplicate temperature-wise of Tuesday with readings around 100 degrees.
Moving overnight Wednesday into Thursday morning, there is potential for thunderstorms as the large low off the coast ejects shortwaves of moisture into the state. Northcentral Washington can expect about a 20% chance of thunderstorms but, with elevated instability, expect light to little or no precipitation, we may still have breezy winds though and possible lightning. The dry lightning and winds, with a hot and dry week, will bring a dangerous formula for fire ignition and/or spread.
An upper level low continues to build off the Pacific Coast and will begin progressing inland bringing a cold front into the region by Friday. Friday will cool slightly, but still remain above normal by approximately 10 degrees with Northcentral Washington temperatures into the upper 90’s to near 100 degrees.
An upper level trough will push further inland on Saturday providing well needed relief from this week`s heat. With that said, high temperatures will still be rather warm and remain above normal with afternoon high temperature son Friday, Saturday and Sunday into the lower 90’s.