[Tropical] Hurricane Local Statement

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Hurricane Douglas Local Statement Advisory Number 19
National Weather Service Honolulu HI  EP082020
455 PM HST Fri Jul 24 2020

This product covers the Hawaiian islands

**MAJOR HURRICANE DOUGLAS STILL MOVING TOWARD HAWAII**

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

* CHANGES TO WATCHES AND WARNINGS:
    - A Hurricane Watch has been issued for Central Oahu, Oahu
      Koolau, Oahu North Shore, Oahu South Shore, Olomana, Waianae
      Coast, and Waianae Mountains

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

* STORM INFORMATION:
    - About 870 miles east-southeast of Honolulu or about 660 miles
      east of Hilo
    - 17.9N 145.1W
    - Storm Intensity 115 mph
    - Movement West-northwest or 295 degrees at 20 mph

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

Hurricane Douglas may bring damaging winds, heavy rainfall, and
high surf to parts of the state this weekend and possibly into Monday.
Some impacts from Douglas could be experienced as early as Saturday
night, mainly over the eastern end of the island chain. Douglas may
move directly over portions of the state on Sunday. While Maui and the
Big Island would be first to experience impacts, do not focus on the
exact track forecast track or intensity of Douglas at this time, and
be prepared for changes in future forecasts.

Damaging winds may begin as early as Saturday night across parts of
Maui and the Big Island, possibly spreading westward to the rest of
the state on Sunday. It is 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 Saturday night on Maui and
the Big Island, and chances for flooding will increase for much of the
state on Sunday. The flood threat could persist into Monday for some
islands. Storm total rainfall of 6 to 10 inches, locally to 15 inches,
will be possible. While the highest rainfall will favor windward
areas, leeward areas could also experience flooding.

Large swells arriving ahead of Douglas will produce dangerous surf
along east and southeast facing shores, especially on the Big Island
and Maui. Large and rough seas will build rapidly Saturday night and
Sunday on exposed east and southeast facing shores and may produce
damaging surf, significant beach erosion, and overwash onto vulnerable
coastal roads, particularly during high tide.

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

* WIND:
Prepare for dangerous wind having possible significant impacts across
the State of Hawaii. 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.


* SURGE:
Prepare for locally hazardous surge having possible limited impacts
across the State of Hawaii. 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.


* FLOODING RAIN:
Prepare for life-threatening rainfall flooding having possible
devastating impacts across the State of Hawaii. 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.


* 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 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.

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.

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 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 Honolulu HI around 1130 PM HST, or sooner if conditions
warrant.

$$
Wroe
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