[Tropical] Hurricane Local Statement

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Hurricane Douglas Local Statement Advisory Number 24
National Weather Service Honolulu HI  EP082020
1107 PM HST Sat Jul 25 2020

This product covers the Hawaiian islands

**HURRICANE DOUGLAS DRAWING CLOSER TO HAWAII**

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

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

* CURRENT WATCHES AND WARNINGS:
    - A Hurricane Warning is in effect for Central Oahu, Kauai
      Leeward, Kauai Mountains, Kauai Windward, Niihau, Oahu Koolau,
      Oahu North Shore, Oahu South Shore, Olomana, Waianae Coast, and
      Waianae Mountains
    - 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 340 miles east of Honolulu or about 150 miles
      east-northeast of Hilo
    - 20.4N 152.8W
    - Storm Intensity 90 mph
    - Movement West-northwest or 290 degrees at 16 mph

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

The potential for damaging winds, heavy rainfall, coastal flooding,
and life-threatening surf will quickly rise later tonight into Sunday
morning for the eastern end of the state as Hurricane Douglas
approaches and moves into the area. Douglas is forecast to move near
or directly over portions of Maui County and Oahu Sunday into Sunday
night, then Kauai Sunday night into Monday. Regardless of the exact
track, interests are reminded that impacts can occur well away from
the tropical cyclone center and any 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.

The threat for heavy rainfall will quickly rise later tonight into
Sunday morning for Maui County and the Big Island, then for Oahu and
Kauai County Sunday through early Monday. 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 continue to
build rapidly from east to west across the exposed coastal waters as
Douglas approaches and moves through. 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.

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

* SURGE:
Protect against locally hazardous surge having possible limited
impacts along exposed east and north facing shores. 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. 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.

* 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.

* 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.

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.

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.

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.

When securing your property, outside preparations should be concluded
as soon as possible before conditions deteriorate. The onset of
strong gusty winds or flooding can cause certain preparedness
activities to become unsafe.

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 600 AM HST, or sooner if conditions
warrant.

$$

Gibbs/JT
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