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SNOQUALMIE, Wash. - A major north-south interstate was cut off and 40,000 people were urged to leave their homes as snowmelt and rain swelled rivers and caused mudslides and avalanches that engulfed neighborhoods and roadways.
Warmer temperatures and heavy rains were rapidly melting the deep snow that dumped on the Cascade mountains over the weekend. Ten inches of snow melted in a 12-hour period at Snoqualmie Pass, according to Meteorologist Andy Haner.