[Tropical] Hurricane Local Statement

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WTUS86 KLOX 182139
HLSLOX
CAZ038-087-088-346>358-362-366>383-548>550-191000-

Hurricane Hilary Local Statement Advisory Number 10
National Weather Service Los Angeles/Oxnard CA  EP092023
239 PM PDT Fri Aug 18 2023

This product covers Southwest California

**TROPICAL STORM WATCH EXPANDED TO INCLUDE ALL OF LOS ANGELES COUNTY...AS
 WELL AS THE MOUNTAINS...VALLEYS...AND FOOTHILLS OF VENTURA COUNTY**

NEW INFORMATION
---------------

* CHANGES TO WATCHES AND WARNINGS:
    - The Tropical Storm Watch has been expanded to include all of Los
      Angeles County, as well as the mountains, valleys, and foothills
      of Ventura County.

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Watch includes all of Los Angeles County, as
      well as the mountains, valleys, and foothills of Ventura County.

* STORM INFORMATION:
    - About 1080 miles south-southeast of Avalon CA or about 1120
      miles south-southeast of Los Angeles Airport CA
    - 18.7N 112.2W
    - Storm Intensity 130 mph
    - Movement Northwest or 315 degrees at 12 mph

SITUATION OVERVIEW
------------------

Hurricane Hilary will weaken to a tropical storm as it approaches
Southern California this weekend. Flash flooding will be possible
across the whole region, with rare and dangerous flooding possible
across the mountains and deserts. Strong, tropical-storm-force winds
will be possible Sunday through Monday, strongest over the mountains,
valleys, and foothills of Los Angeles and Ventura Counties.

POTENTIAL IMPACTS
-----------------

* FLOODING RAIN:
Prepare for life-threatening rainfall flooding having possible
extensive impacts across Los Angeles and Ventura Counties, and possibly
Santa Barbara County. Potential impacts include:
    - Major rainfall flooding may prompt many evacuations and rescues.
    - Small streams, creeks, canals, arroyos, and ditches may become
      dangerous rivers. Destructive runoff may rage down mountain
      valleys while increasing susceptibility to rockslides, mudslides,
      and debris flows. Flood control systems and barriers may become
      stressed.
    - Streets and parking lots become rivers of moving water with
      underpasses submerged. Driving conditions become dangerous. Many
      road and bridge closures with some weakened or washed out.

* WIND:
Prepare for hazardous wind having possible limited to significant impacts
across Los Angeles and Ventura Counties, with greatest impacts over
Catalina Island and Santa Barbara Island, as well as the mountains of
Los Angeles County. Potential impacts in this area include:
    - Damage to porches, awnings, carports, sheds, and unanchored
      mobile homes. Unsecured lightweight objects blown about.
    - Many large tree limbs broken off. A few trees uprooted, but with
      greater numbers in places where trees are shallow rooted. Some
      fences and roadway signs blown over.
    - A few roads impassable from debris, particularly within urban
      or heavily wooded places. Hazardous driving conditions on
      bridges and other elevated roadways.
    - Scattered power and communications outages.

Elsewhere across Southwest California, little to no impact is
anticipated.

* SURGE:
Little to no impacts are anticipated at this time across Southwest
California. However, coastal flooding will be possible especially
around Catalina Island and Long Beach.

* TORNADOES:
Little to no impacts are anticipated at this time across Los Angeles,
Ventura, Santa Barbara, or San Luis Obispo Counties in Southern
California.

PRECAUTIONARY/PREPAREDNESS ACTIONS
----------------------------------

* EVACUATIONS:
Listen to local official for recommended preparedness actions,
including possible evacuation. If ordered to evacuate, do so
immediately.

* OTHER PREPAREDNESS INFORMATION:
Now is the time to check your emergency plan and emergency supplies
kit and take necessary actions to protect your family and secure your
home or business.

When making safety and preparedness decisions, do not focus on the
exact forecast track since hazards such as flooding rain, damaging
wind gusts, storm surge, and tornadoes extend well away from the
center of the storm.

If in a place that is vulnerable to high wind, such as near large
trees, a manufactured home, upper floors of a high-rise building, or
on a boat, plan to move to safe shelter.

If you live in a place particularly vulnerable to flooding, such as
near the ocean or a large inland lake, in a low-lying or poor
drainage area, in a valley, or near an already swollen river, plan to
move to safe shelter on higher ground.

Always heed the advice of local officials and comply with orders that
are issued. Do not needlessly jeopardize your life or the lives of
others.

If you are a visitor, know the name of the county in which you
are located and where it is relative to current watches and warnings.
If staying at a hotel, ask the management staff about their onsite
disaster plan. Listen for evacuation orders, especially pertaining to
area visitors.

Closely monitor weather.gov, NOAA Weather Radio and local news
outlets for official storm information. Listen for possible changes
to the forecast.

* ADDITIONAL SOURCES OF INFORMATION:
- For information on appropriate preparations see ready.gov
- For information on creating an emergency plan see getagameplan.org
- For additional disaster preparedness information see redcross.org

NEXT UPDATE
-----------

The next local statement will be issued by the National Weather
Service in Los Angeles/Oxnard CA around 10 PM PDT, or sooner if
conditions warrant.

$$

Cohen/Gomberg
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