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Weather with Cliff Mass
Fri March 30, 2012
Atmospheric river brings record rains to Northwest
What happens when a river runs into a mountain?
An atmospheric river, carrying dense clouds of moisture from the tropical Pacific, has been colliding with our mountains, and all that moisture has been dropping like a waterfall.
"Virtually every one of our flood events or record-setting daily rainfall events is associated with an atmospheric river," says KPLU weather expert Cliff Mass.
On Thursday, many cities across Washington set all-time records for rain that day. And this March is sure to be in the top-10 for overall rainfall. Mass says Seattle will end up double what it typically gets for the month.
Mass explains how this all works, in his weekly weather conversation.
Despite a partial break today, it looks like that atmospheric river will keep flowing our direction for at least another week. Mass is predicting light but steady rain on Saturday, and another storm arriving on Sunday afternoon or evening.
The weekly KPLU feature "Weather with Cliff Mass" airs every Friday at 9 a.m. immediately following BirdNote, and repeats twice on Friday afternoons during All Things Considered. The feature is hosted by KPLU’s Science and Health reporter Keith Seinfeld. Cliff Mass is a University of Washington Professor of Atmospheric Sciences and renowned Seattle weather prognosticator. You can also subscribe to a podcast of this and previous "Weather with Cliff Mass" shows.