A RECORD BREAKING AND PROLONGED HEAT WAVE WILL ARRIVE THIS WEEKEND AND PERSIST WELL INTO NEXT WEEK. AN EXCESSIVE HEAT WATCH GOES INTO AFFECT FRIDAY AT 1:00 P.M. AND WILL CONTINUE THROUGH WENESDAY, JUNE 30TH.
As high pressure off the coast continues to drag hot desert air our way Northcentral Washington can expect mostly sunny weather today with a northwest breeze 5-15 mph and hot with highs this afternoon in the mid 90’s. Hot, dry north winds channeling down the Okanogan Valley are expected to blow between 10 and 15 mph for much of the day with localized gusts approaching 25 mph in places like Oroville and Omak. Any fire ignitions will have the potential to spread quickly in this environment that will flirt with Red Flag criteria.
Our highly advertised heat wave will begin to build into the Pacific Northwest Friday and Saturday. An unusually strong upper level high off the coast of southern B.C. will migrate inland on Friday and amplify as it is pinched between a trough over the Bering Sea and another downstream trough digging into the eastern United States. The net result will be a high amplitude ridge of unprecedented strength for this time of year. Look for afternoon temperatures on Friday to climb well into the upper 90s over most of central and eastern Washington with places like Moses Lake, Omak, Wenatchee and Leavenworth nearing triple digits.
By Saturday, several daily records will be threatened with high temperatures around 105 degrees and that will be just the beginning as temperatures continue an upward trajectory into the early to middle part of next week.
Sunday through Wednesday, the Inland Northwest will experience an historic heat wave this weekend through next week. It is now seeming more likely that the triple digits will hang around through Wednesday and even Thursday, with highs on Sunday near 110 degrees and possibly 112 degree for Monday and Tuesday which would be all-time record high temperatures for Wenatchee. Sunny for Wednesday too and slightly cooler but still hot with highs between 105-110 degrees.