There are plenty of natural disasters to worry about in the Pacific Northwest, like earthquakes, wildfires, and volcanic eruptions. But you may have heard less about lahars -- fast-moving mudflows that emerge from volcanoes. Seattle-based narrative journalist Wudan Yan has written about lahars for Popular Mechanics, and how scientists are sounding the alarm about the threats they pose to communities near Mount Rainier. We can only make Seattle Now because listeners support us. Tap here to make a gift and keep Seattle Now in your feed.  Got questions about local news or story ideas to share? We want to hear from you! Email us at seattlenow@kuow.org, leave us a voicemail at (206) 616-6746 or leave us feedback online.See omnystudio.com/listener for privacy information.