Weather models continue to be in good agreement depicting the development and slow progression of a Rex Block pattern across the western United States through the weekend. A Rex Block is two adjacent highs and lows or a strong low-pressure system next to a strong area of high pressure. Northcentral Washington will be under the high-pressure component of this weather pattern through the weekend before the ridge axis finally settles over the Great Basin and Central Rockies by Monday. A quiet and dry weather pattern will be the rule and persist through the Sunday with highs gradually increasing into the upper 80`s across much of the forecast area with some locations around the deep basin and Wenatchee Valley looking at the low 90s by Saturday and Sunday.
Sunshine in our Thursday weather forecast with high temperatures this afternoon into the lower 80’s. Friday, Saturday and Mother’s Day Sunday, we will see sunny skies and near record-breaking temperatures.
Friday’s high will top off near 86 while both Saturday and Sunday we could see a high of 90 degrees.
For Monday and Tuesday, model guidance remains rather consistent forecasting a fattening of the upper level ridge, an increasing southwest upper flow, and a deepening weather trough over the eastern Pacific that will influence conditions across eastern Washington. Mostly sunny both days but cooler with highs in the lower to mid-80’s.
By Wednesday morning, a weak area of low pressure will push northeast into the region along with a deeper moisture plume. This additional moisture along with afternoon instability will support a chance for mainly mountain showers Tuesday and Wednesday with some isolated showers moving through Northcentral Washington Wednesday morning and afternoon, high Wednesday in the upper 70’s.