Possible major flooding event in Northern California

Posted by neschemal@reddit | PrepperIntel | View on Reddit | 35 comments

Precipitation totals from recent model runs project a very wide swath of rainfall exceeding 12 inches in the next seven days. Locally, 30+ inches of rain could be possible in some geographic settings. Could rival the 1997 flood if worst case plays out.

The multi day atmospheric river event the began late day 2 for far
southwest Oregon into northwest California will continue day 3. The
rapidly deepening day 2 low over the northeast Pacific will anchor
a nearly stationary upper vortex off the Pac NW coast day 3. Strong
persistent deep layered west southwest flow on the south side of
this vortex will impact northwest California into far southwest
Oregon day 3. with IVT values of 500-800 km/m-1 s-2. and 850-700 mb
moisture flux anomalies of 2-4 standard deviations above the mean.
There is fairly good model agreement with heavy precip totals of
3-5" primarily over northwest California, with isolated totals of
6-8" possible. No significant changes made to the previous slight
risk area.

(Note this discussion from the Excessive Rainfall Discussion uses single day rainfall totals)