StormTracker 9 Forecast: Tracking chance of precipitation on Wednesday

Tracking chance of precipitation on Wednesday.

Posted: Aug 19, 2019 11:13 AM

EUGENE, Ore. -- It's a cloudy start to the work week with marine clouds pushing into the valleys this Monday morning. We expect the skies to clear by noon today with high temperatures warming into the low to mid 80s inland and near 70 at the coast.

Fast Forecast:
Monday: Becoming sunny. Highs in mid 80s
Tuesday: Mostly sunny. Highs in low to mid 80s
Wednesday: Partly sunny w/ chance of showers Highs in upper 70s to low 80s
Thursday: Partly sunny. Highs in low 80s
Friday: Mostly sunny. Highs in low to mid 80s
Saturday: Mostly sunny. Highs in low to mid 80s
Sunday: Mostly sunny. Highs in low to mid 80s

Due to upper-level ridging, bringing some higher pressure Monday into Tuesday, there will be fewer marine clouds on Tuesday morning. This will allow for high temperatures warming several degrees on Tuesday. The one limiting factor to highs on Tuesday will be increasing mid to high-level clouds from our next approaching storm system.

Big changes will be on the way for Wednesday with an interesting setup. Tuesday night into Wednesday will see a subtropical system phase with a shortwave trough dropping out of the Gulf of Alaska. Storm phasing is when two low pressure storm systems combine into one system. Lows that combine or phase together can be stronger and more intense. This combined storm will drop a moist, cool front into SW Washington and NW Oregon on Wednesday.

At this time, the coast and the Willamette Valley are in play for moisture. We're not ruling out Roseburg but think there is a smaller chance of anything developing in the Umpqua Basin at this time.

There still remains some uncertainty on the amount of precipitation from the storm system and where that precipitation will be, but the trend is an increasing chance of precipitation. One thing is for sure -- even if we do not receive any significant precipitation to area, it will be very humid on Wednesday.

This system will move out pretty quickly, resulting in drying conditions, decreasing clouds, and temperatures topping out several degrees below average. Friday through the weekend will see the return of quasi-zonal flow keeping precipitation chances low and temperatures somewhat seasonable.

For more weather information, go to the KEZI 9 News StormTracker 9 weather page.

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