A dry slot in the atmospheric river that has been impacting the region with lots of moisture over the past few days will give the Inland Northwest a brief break in rain for today. Low stratus and fog pockets of fog across the Basin will start the day off. The break from the wet weather will end late this afternoon as moisture will begin to filter into Northcentral Washington with a 50% chance of rain or snow with highs today in the upper 30’s.
Tomorrow the region will still be under the influence of a shallow ridge of high pressure allowing the feed of moisture and warm air to bring widespread rain showers and mountain snow to the above 5000ft for the Cascades to start. An approaching low moving into British Columbia will bring a warm front through the region on Friday. This will also bring an increase in winds for the Columbia Basin with southerly sustained winds in the upper teens/low 20s and gusts near 30 mph. Temperatures will be unseasonable warm in the upper 40s to low 50s for highs in the Wenatchee Valley Friday while the Moses Lake area will see afternoon highs tomorrow in the mid to upper 50’s.
On Saturday, we start out breezy ahead of a quick-moving, strong cold front set to move through in the afternoon. Northcentral Washington can expect a 70% chance of rain, west winds 10-20 mph and gusty at times with highs in Wenatchee in the upper 40’s to near 50 while the Columbia Basin will top out near 60 degrees.
Our temperatures will drop quickly by Sunday as the cold-weather trough moves through the region. After that, we remain in a persistent northwest flow that will reinforce the colder air on Monday and Tuesday. Well also see a brief dry period until Tuesday afternoon when the next system moves in. We look to remain unsettled through the rest of the work week.
It currently looks like Monday and Tuesday will be our coldest days with highs in the30s to around 40. By Wednesday, there is a 30% chance of precipitation with warmer temperatures with afternoon highs in the mid 40’s.