Studying tree rings helped scientists pinpoint when Mount Rainier last sent a lahar down its steep slopes, which could help planners anticipate future mudflows. By Katherine Kornei Katherine Kornei ...

One of the most deadly and dangerous volcano hazards isn’t lava. Mudflows called lahars can come without clear warning. In June 2024, early career geologist Gustavo Béjar López traveled to Guatemala ...

The CNN Original Series “Violent Earth With Liev Schreiber” explores harrowing weather events, such as hurricanes and wildfires, that are increasingly frequent in our changing climate. The latest ...

Danger from Mount Rainier isn’t always born from smoke and ash. According to the United States Geological Survey, the last significant event to happen at Mount Rainier was a no-notice lahar: a ...

Lahars are some of the most dangerous natural events connected to our Cascade volcanoes, destructive volcanic mudflows that can slam communities far from the mountains. “Some people sometimes get ...

USGS: no-notice lahars can occur without eruption signals. Report: 41% of residents and 46% of homes lie in lahar zone. City urges immediate evacuation; sirens, bilingual alerts; drill Apr 23, 2026.