* WHAT...Significant and widespread flooding caused by excessive
rainfall will be likely, with potential debris flow impacts across
recent burn scars.

* WHERE...For all areas of San Luis Obispo, Santa Barbara, Ventura
and Los Angeles counties.


* WHEN...From 4 PM PST this afternoon through Thursday evening.

* IMPACTS...This prolonged strong Atmospheric River storm system
will bring periods of heavy rain from late Tuesday into Thursday
evening. Potential flooding impacts include the threat of
significant and widespread urban roadway flooding, a high risk of
major rock/mudslides, and rapid rises in creeks, streams, and
rivers which will likely lead to swift water rescues. The recent
burn scars will be at risk for debris flows, possibly damaging.
These flooding impacts will likely lead to significant travel
delays and road closures during this busy holiday travel period.

* ADDITIONAL DETAILS...
- Heavy rainfall with possible thunderstorms is expected with
high rainfall rates, potentially exceeding one inch per hour
during the peak of the event Tuesday night into Wednesday
across favored south facing slopes and near thunderstorms.
Another round of heavier rain and thunderstorms will be
possible on Thursday.
- http://www.weather.gov/safety/flood
                                            

* WHAT...South to southeast winds 30 to 50 mph with damaging gusts
up to 70 mph likely, except up to 80 mph in the mountains and
foothills.

* WHERE...All of San Luis Obispo and Santa Barbara counties, the
mountains and foothills of Los Angeles and Ventura counties, and
the Antelope Valley.

* WHEN...Until 3 PM PST Thursday.

* IMPACTS...Damaging winds are likely with this powerful Atmospheric
River storm, with widespread downed trees and powerlines likely,
as well as the potential for power outages and property damage.
Travel will be difficult, especially for high profile vehicles.
Mountain roadways and passes will be especially dangerous,
including the busy Interstate 5 near the Grapevine. The
combination of strong winds and moist soils will increase the risk
for downed trees.
                                            

* WHAT...Large breaking waves of 10 to 15 feet with dangerous
rip currents.

* WHERE...San Luis Obispo County Beaches and Santa Barbara
County Central Coast Beaches.

* WHEN...From 9 PM this evening to 11 AM PST Saturday.

* IMPACTS...There is an increased risk for ocean drowning. Rip
currents can pull swimmers and surfers out to sea. Large
breaking waves can cause injury, wash people off beaches and
rocks, and capsize small boats near shore.

* ADDITIONAL DETAILS...Minor to potentially isolated moderate
coastal flooding for south-facing beaches especially during
high tides. This is expected to occur from this evening
through Thursday due to strong southerly winds.