[Tropical] Hurricane Local Statement

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Hurricane Olivia Local Statement Advisory Number 41
National Weather Service Honolulu HI  EP172018
1111 AM HST Mon Sep 10 2018

This product covers the Hawaiian islands

** HURRICANE OLIVIA CONTINUES TO MOVE WESTWARD TOWARD HAWAII **

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

* CHANGES TO WATCHES AND WARNINGS:
    - None

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Watch is in effect for Central Oahu, Oahu
      Koolau, Oahu North Shore, Oahu South Shore, Olomana, Waianae
      Coast, and Waianae Mountains
    - A Tropical Storm Warning is in effect for Big Island Interior,
      Big Island North and East, Big Island Summits, Haleakala
      Summit, Kahoolawe, Kohala, Kona, Lanai Makai, Lanai Mauka,
      Leeward Haleakala, Maui Central Valley, Maui Leeward West, Maui
      Windward West, Molokai Leeward, Molokai Windward, South Big
      Island, and Windward Haleakala

* STORM INFORMATION:
    - About 590 miles east of Honolulu or about 430 miles
      east-northeast of Hilo
    - 21.7N 148.7W
    - Storm Intensity 75 mph
    - Movement West or 270 degrees at 9 mph

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

Hurricane Olivia is expected to bring strong winds, heavy rainfall,
and high surf to parts of the state this week. Olivia is forecast to
close in on the main Hawaiian Islands Tuesday and move over portions
of the island chain Tuesday night and Wednesday. Maui and the Big
Island will be the first to experience impacts from Olivia. Do not
focus on the exact forecast track or intensity of Olivia and be
prepared for changes in future forecasts. Also, keep in mind that just
because Olivia is forecast to be a weaker storm than Lane, the impacts
could be significantly worse.

Damaging tropical storm force winds may begin as early as Tuesday
afternoon across Maui and the Big Island. Additionally, hurricane
force wind gusts are possible as Olivia moves across the state Tuesday
night and Wednesday. It is important to remember that the mountainous
terrain of Hawaii can produce localized areas of highly enhanced
winds, even well away from the tropical cyclone center.

The chance for flooding rainfall will increase rapidly late Tuesday
and will remain a significant threat through at least Wednesday. Storm
total rainfall amounts are expected to be around 10 to 15 inches, with
isolated areas up to 20 inches. Much of this will be focused on
windward areas, however, flooding is still a significant threat for
all areas.

Swells and surf generated by Hurricane Olivia will continue to slowly
build through Tuesday, and reach damaging levels on some east facing
shores Tuesday and Wednesday. Surf heights along east facing shores
are expected to reach up to 20 feet on Maui and the Big Island, and
10 to 15 feet on other islands. This is expected to result in
significant beach erosion and overwash onto vulnerable coastal
roadways, particularly during high tides.

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

* WIND:
Protect against dangerous wind having possible significant impacts
across Oahu, the islands of Maui County, and the Big Island. Potential
impacts in this area include:
    - Some damage to roofing and siding materials, along with damage
      to porches, awnings, carports, and sheds. A few buildings
      experiencing window, door, and garage door failures. Mobile
      homes damaged, especially if unanchored. Unsecured lightweight
      objects become dangerous projectiles.
    - Several large trees snapped or uprooted, but with greater
      numbers in places where trees are shallow rooted. Several
      fences and roadway signs blown over.
    - Some roads impassable from large debris, and more within urban
      or heavily wooded places. A few bridges, causeways, and access
      routes impassable.
    - Scattered power and communications outages, but more prevalent
      in areas with above ground lines.

Also, protect against hazardous wind having possible limited impacts
across the remainder of the state.

* FLOODING RAIN:
Protect against life-threatening rainfall flooding having possible
devastating impacts across Molokai, Maui, and the Big Island. Potential
impacts include:
    - Extreme rainfall flooding may prompt numerous evacuations and
      rescues.
    - Rivers and tributaries may overwhelmingly overflow their banks
      in many places with deep moving water. Small streams, creeks,
      canals, arroyos, and ditches may become raging rivers. In
      mountain areas, deadly runoff may rage down valleys while
      increasing susceptibility to rockslides and mudslides. Flood
      control systems and barriers may become stressed.
    - Flood waters can enter numerous structures within multiple
      communities, some structures becoming uninhabitable or washed
      away. Numerous places where flood waters may cover escape
      routes. Streets and parking lots become rivers of raging water
      with underpasses submerged. Driving conditions become very
      dangerous. Numerous road and bridge closures with some weakened
      or washed out.

Protect against life-threatening rainfall flooding having possible
limited to extensive impacts across the rest of the state.

* SURGE:
Protect against locally hazardous surge having possible limited
impacts across east facing coastlines of Oahu, the islands of Maui
County, and the Big Island. Potential impacts in this area include:
    - Localized inundation with storm surge flooding mainly along
      immediate shorelines and in low-lying spots, or in areas
      farther inland near where higher surge waters move ashore.
    - Sections of near-shore roads and parking lots become overspread
      with surge water. Driving conditions dangerous in places where
      surge water covers the road.
    - Moderate beach erosion. Heavy surf also breaching dunes, mainly
      in usually vulnerable locations. Strong rip currents.
    - Minor to locally moderate damage to marinas, docks, boardwalks,
      and piers. A few small craft broken away from moorings.

Elsewhere across the Hawaiian islands, little to no impact is
anticipated.

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 complete all preparations to protect life and
property in accordance with your emergency plan. Ensure you are in a
safe location before the onset of strong winds or possible flooding.

Failure to adequately shelter may result in serious injury or loss of
life. Always heed the advice of local officials and comply with any
orders that are issued. Remember, during the storm 9 1 1 Emergency
Services may not be able to immediately respond if conditions are
unsafe. This should be a big factor in your decision making.

Keep cell phones well charged. Cell phone chargers for automobiles
can be helpful, but be aware of your risk for deadly carbon monoxide
poisoning if your car is left idling in a garage or other poorly
ventilated area.

It is important to remain calm, informed, and focused during an
emergency. Be patient and helpful with those you encounter.

If you are a visitor, be sure to know the name of the city or town in
which you are staying and the name of the county in which it resides.
Listen for these locations in local news updates. Pay attention for
instructions from local authorities.

Rapidly rising flood waters are deadly. If you are in a flood-prone
area, consider moving to higher ground. Never drive through a flooded
roadway. Remember, turn around don't drown!

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, consider moving to a safer shelter before the onset of
strong winds or flooding.

Closely monitor weather.gov, NOAA Weather radio or local news outlets
for official storm information. Be ready to adapt to possible changes
to the forecast. Ensure you have multiple ways to receive weather
warnings.

* 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 Honolulu HI around 530 PM HST, or sooner if conditions
warrant.

$$
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