More tips on debris flows. This is from Napa County's site.

Among them:

— Listen and watch for rushing water, mud, or unusual sounds such as trees cracking or boulders knocking together. A faint rumbling sound that increases in volume is noticeable as the landslide nears.
— On rainy nights, residents should NOT sleep in lower-floor bedrooms on the sides of houses that face hazardous slopes. > 100 deaths have occurred in California due to debris flows burying persons who were sleeping in lower-floor bedrooms that were adjacent to hazardous slopes.
— Assume that all drainages are capable of carrying debris flows, especially if relatively loose, sandy soils are present in the watershed.
— Stay alert to the forecast and the amount of rain falling locally during storms.
I'll add that you need to stay tuned to official agencies — social media, phone calls, texts — as the emergency goes on so you can get out safely. Evac warnings are already out for parts of Santa Cruz County.
And don't go around barricaded or into flooded areas. Finally, please notify neighbors who may not have received the emergency messages.
(You can find Napa County's page on all this at: https://www.countyofnapa.org/3048/Debris-Flow)
https://twitter.com/sccounty/status/1353484094517121024?s=20
https://twitter.com/sccounty/status/1353563932376485888?s=19
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