Excessive Heat Watch

from SUN 10:00 AM PDT until SUN 9:00 PM PDT, Seattle and Vicinity, Everett and Vicinity, West Slopes North Cascades and Passes, West Slopes North Central Cascades and Passes, East Puget Sound Lowlands, Bellevue and Vicinity, Seattle and Vicinity, Bremerton and Vicinity, Tacoma Area, Hood Canal Area, Lower Chehalis Valley Area, West Slopes South Central Cascades and Passes, Southwest Interior

Excessive Heat Watch

from SUN 11:00 AM PDT until TUE 9:00 PM PDT, East Slopes Northern Cascades, Wenatchee Area

from SAT 12:00 PM PDT until SUN 9:00 PM PDT, Lower Columbia and I - 5 Corridor in Cowlitz County

WATCH: What could have triggered the deadly mudslide?

By Tyler Slauson

Published March 23, 2014

Q13 FOX Chief Meteorologist Walter Kelley explains the science behind mudslides.