From LAist, January 24:
With rain finally on the way this weekend, debris flows are a real concern below steep, recently burned areas. Just how much water, rock, mud and other debris can flow will depend on how much rain falls in a short period.
Where things stand
Rain is expected to stick around from Saturday through Monday, though the period of greatest risk will be between 4 p.m. Sunday and 10 a.m. Monday. That's when the heaviest precipitation is expected to fall, according to the National Weather Service.While 0.25 inches an hour is likely across the broader region, isolated thunderstorms could drop more than 0.5 inches an hour, exceeding the threshold of concern for debris flows. Anticipate problems if rainfall rates exceed a quarter-inch in 15 minutes, especially in mountainous areas....
....MUCH MORE
