To highlight the heavy rainfall potential, NWS WPC now has a
moderate risk for much of the area between Monday and Tuesday,
and Tuesday through Wednesday across the Transverse Range. Peak
rainfall rates are expected to range between 0.50 to 1.00 inch
per hour across the region, but local rates in excess of 1 inch
per hour are certainly possible in favored orographic areas and
near thunderstorms. Rainfall amounts have been increased from 2-5
inches for coasts and valleys to 5-9 inches for the mountains and
foothills. Local amounts to 12 inches are possible along the
south-facing slopes and foothills. Given the recent wet pattern,
some rivers will likely reach at least minor flood stage with the
expected rainfall amounts. Areas of concerns from NWS CNRFC
suggest the Salinas, Sisquoc, and Ventura Rivers possible
approaching or exceeding flood stage, but many creeks and washes
will likely be flowing or normally dry washes. Snow levels will
be above 8000 feet for the most significant precipitation,
although they will drop rapidly behind the front Tuesday afternoon
and evening.
With 850 mb winds forecast to increase to 40-65 knots, high wind
watches were converted to high wind warnings as there is a high
likelihood of damaging wind gusts. High wind warnings will start
as soon as midnight tonight for most areas north of Point
Conception and into the Transverse Ranges. A later start is
forecast for areas to the south, with High Wind Warnings going
into effect late Monday morning for the Los Angeles County
mountains and the Antelope Valley. Wind advisory have also been
issued for the remaining coastal and valley areas beginning late
Monday morning.