Weather models continue to show an active period setting up with heavy rain, possible thunderstorms and much cooler temperatures today through Friday. A deep closed low-pressure system off the Northern California coast will continue to provide a moist southerly flow over the region, which means a very moist atmosphere, which will aid in the development of showers and thunderstorms. There is a flood watch from this afternoon through late tonight for the East Slopes of the Northern Cascades, Okanogan Highlands, Okanogan Valley, Waterville Plateau and Wenatchee Area. Widespread rain amounts of a half inch to inch are forecast but higher amounts are expected under thunderstorms. Rapid rises on creek and streams is likely where heavy rain falls. Mud or rockslides are also possible in steep terrain especially near recent burn scars. There is a 70% chance of rain in the Wenatchee Valley today and a 90% chance tonight with heavy downpours possible, high temperature this afternoon around 69 degrees.
More rain in the weather forecast for Friday especially in the morning with an 80% chance of rain and high temperatures only in the lower 60’s. Most of Northcentral Washington will see total rain amounts by Friday night between a half and three quarters of an inch of rain. Breezy conditions for Friday as well out of the west 10-15 mph with gusts up to 30 mph.
We will see a bit of a reprieve from the wet weather on Saturday with partly cloudy skies and afternoon high temperatures warmer into the upper 60’s.
A huge area of low pressure continues to spin off smaller waves of moisture into the northwest, which will bring us a 50% chance of rain on Sunday with highs near 70 degrees.
This general precipitation weather pattern will continue through Monday as this next low pressure system drifts past the region, highs Monday in the lower 70’s.
The Low will continue to sit over the Gulf of Alaska and bring periods of widespread showers to the region on Tuesday and Wednesday with a 20-30% chance of showers and afternoon high temperatures around 70 degrees.