A weak weather ridge is starting to build along the Pacific Northwest coast, which means sunny skies, light winds and warmer temperatures. Temperatures will climb about 3 to 6 degrees warmer than Sunday throughout the Inland Northwest. A more substantial warm-up takes place Tuesday with highs in the upper 80s expected which is about 10-15 degrees above normal for this time of year.
On Wednesday and Wednesday night, model agreement is in fairly good that a weak upper level low will track from Southwest Idaho into Southwest Montana across the ridge of high pressure on Wednesday and weaken as it does. The path of the low is still conducive to keeping a 20% chance of showers for Northcentral Washington. For Thursday and Friday, the ridge remains in place and will strengthen with highs in the upper 80’s with sunny skies.
By Friday night through the weekend, a weather trough moves in from the Pacific. This weather pattern will yield an increasing threat of thunderstorms as the moist southerly flow brings a renewed threat to the region. We have a 20% chance of rain on Friday night, a 30% chance Saturday and Saturday night with a 20% chance of lingering showers on Sunday. High temperatures will remain warm through Saturday with highs in the upper 80’s before we cool down to the upper 70’s on Sunday.