[Tropical] Hurricane Local Statement

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Hurricane Douglas Local Statement Advisory Number 23
National Weather Service Honolulu HI  EP082020
513 PM HST Sat Jul 25 2020

This product covers the Hawaiian islands

**HURRICANE DOUGLAS NEARS HAWAII**

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

* CHANGES TO WATCHES AND WARNINGS:
    - The Tropical Storm Watch has been upgraded to a Tropical Storm
      Warning for Kauai Leeward, Kauai Mountains, Kauai Windward, and
      Niihau

* CURRENT WATCHES AND WARNINGS:
    - A Hurricane Warning 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 Kauai Leeward, Kauai
      Mountains, Kauai Windward, and Niihau
    - A Tropical Storm Warning and Hurricane Watch are 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 430 miles east-southeast of Honolulu or about 240 miles
      east of Hilo
    - 19.9N 151.4W
    - Storm Intensity 90 mph
    - Movement West-northwest or 290 degrees at 16 mph

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

Hurricane Douglas may bring damaging winds, heavy rainfall, and
high surf to parts of Hawaii beginning as early as tonight in the
eastern portion of the state and then spreading westward on Sunday.
Douglas is forecast to move near or directly over portions of the
smaller islands on Sunday. Impacts can occur well away from the
tropical cyclone center and a slight deviation from the current
forecast track will significantly effect the severity of these
impacts. It is also important to note that the mountainous terrain of
the islands can produce localized areas of highly enhanced winds, even
well away from the tropical cyclone center.

Flooding rain will be possible as early as tonight on Maui and the Big
Island, and chances for flooding will increase for the state on
Sunday. The flood threat could persist into Monday over the western
end of the state. Storm total rainfall accumulations of of 5 to
10 inches, with locally higher amounts to 15 inches will be possible.
While the highest rainfall will favor windward and northern facing
slopes, leeward and southern facing slopes could also experience
flooding.

Large swells arriving ahead of Douglas will produce dangerous surf
along exposed east and north facing shores. Seas will build rapidly
tonight from east to west across the exposed coastal waters as Douglas
nears the area. A combination of higher than predicted water levels,
storm surge, and warning-level surf will lead to significant beach
erosion, with water potentially overwashing onto vulnerable low-lying
coastal roads, especially at and around the daily high tides.

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

* WIND:
Protect against life-threatening wind having possible extensive
impacts across the state of Hawaii. Potential impacts in
this area include:
    - Considerable roof damage to sturdy buildings, with some having
      window, door, and garage door failures leading to structural
      damage. Mobile homes severely damaged, with some destroyed.
      Damage accentuated by airborne projectiles. Locations may be
      uninhabitable for weeks.
    - Many large trees snapped or uprooted along with fences and
      roadway signs blown over.
    - Some roads impassable from large debris, and more within urban
      or heavily wooded places. Several bridges, causeways, and
      access routes impassable.
    - Large areas with power and communications outages.

* SURGE:
Protect against locally hazardous surge having possible limited
impacts across north and east facing shores, particularly on Kauai and
Oahu. 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.

* FLOODING RAIN:
Protect against life-threatening rainfall flooding having possible
extensive impacts across the state of Hawaii, particularly for the
smaller islands. Potential impacts include:
    - Major rainfall flooding may prompt many evacuations and rescues.
    - Rivers and tributaries may rapidly overflow their banks in
      multiple places. Small streams, creeks, canals, arroyos, and
      ditches may become dangerous rivers. In mountain areas,
      destructive runoff may run quickly down valleys while
      increasing susceptibility to rockslides and mudslides. Flood
      control systems and barriers may become stressed.
    - Flood waters can enter many structures within multiple
      communities, some structures becoming uninhabitable or washed
      away. Many places where flood waters may cover escape routes.
      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.

Protect against dangerous rainfall flooding having possible limited
to significant impacts across the state of Hawaii.

* TORNADOES:
Little to no impacts are anticipated at this time across the Hawaiian
islands.

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

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

For those not under evacuation orders, assess the risk from wind, falling
trees, and flooding at your location. If you decide to move, relocate to a
safer location nearby. If you do not relocate, help keep roadways open for
those under evacuation orders.

If evacuating, leave with a destination in mind and allow extra time to get
there. Take your emergency supplies kit. Gas up your vehicle ahead of time.

Let others know where you are going prior to departure. Secure loose items
and pets in the car, and avoid distracted driving.

If evacuating, follow designated evacuation routes. Seek traffic
information on roadway signs, the radio, and from official sources.


* 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.

If you are relocating to safe shelter, leave as early as possible.
Allow extra time to reach your destination. Many roads and bridges
will be closed once strong winds arrive. Check the latest weather
forecast before departing and drive with caution.

If heading to a community shelter, become familiar with the shelter
rules before arrival, especially if you have special needs or have
pets. Take essential items with you from your Emergency Supplies Kit.

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.

Storm surge is the leading killer associated with tropical storms and
hurricanes! Make sure you are in a safe area away from the surge
zone. Even if you are not in a surge-prone area, you could find
yourself cutoff by flood waters during and after the storm. Heed
evacuation orders issued by the 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 1200 AM HST, or sooner if conditions
warrant.

$$

Foster
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