We're dreaming of a . . . soggy Christmas?
A deep trough of moist, cold air blasting down from the Gulf of Alaska is going to soak the region during the next few days, pushing a few local rivers and creeks over their banks.
The National Weather Service reported Thursday that the storm should begin to blow into the area Thursday afternoon, with high winds blasting the Oregon Coast and 2 to 4 inches of rain falling in the Willamette Valley between Saturday and Monday. More rain is expected in higher elevations, with the snow levels rising, leading to possible flooding.
According to the weather service, the Tualatin River and the Clackamas River were most at risk of pushing over their banks during the storm. A computer model shows the Tualatin River nearing flood stage at Dilley and Farmington in Washington County. The model shows the Clackamas River overflowing its banks near Oregon City and Estacada.
Other area rivers, such as the Willamette River in Portland, are expected to rise significantly, but not overflow.
Southeast Portlands Johnson Creek isnt expected to reach flood stage, but it could get close.
The weather service reported that the next 96 hours could produce similar systems that brought scattered flooding to the region in January 2003, January 1983 and last November 1999. All three weather patterns led to heavy rain and flooding in Northern Oregon and Southwest Washington.
Even though there are notable differences between those historical weather patterns and this weeks predictions, the weather service reported that the local weather models appear even more favorable for producing heavier rains than these past events.
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