[Tropical] Hurricane Local Statement

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Hurricane Douglas Local Statement Advisory Number 21
National Weather Service Honolulu HI  EP082020
456 AM HST Sat Jul 25 2020

This product covers the Hawaiian islands

**Hurricane Douglas continues toward Hawaii**

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

* CHANGES TO WATCHES AND WARNINGS:
    - A Tropical Storm Watch has been issued for Kauai Leeward, Kauai
      Mountains, Kauai Windward, and Niihau

* CURRENT WATCHES AND WARNINGS:
    - A Hurricane Watch is in effect for Central Oahu, Oahu Koolau,
      Oahu North Shore, Oahu South Shore, Olomana, Waianae Coast, and
      Waianae Mountains
    - A Tropical Storm Watch 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 640 miles east-southeast of Honolulu or about 440 miles
      east of Hilo
    - 19.1N 148.4W
    - Storm Intensity 105 mph
    - Movement West-northwest or 290 degrees at 18 mph

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

Hurricane Douglas may bring damaging winds, heavy rainfall, and
high surf to parts of the state over the weekend and possibly into
Monday. Some impacts from Douglas could be experienced as early as
tonight, mainly over the eastern end of the island chain. Douglas is
forecast to move near or directly over portions of the smaller
islands on Sunday. While Maui and the Big Island would be first to
experience impacts, do not focus on the exact forecast track or
intensity of Douglas at this time, as impacts can occur well away
from the tropical cyclone center.

Damaging winds may begin as early as late tonight 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 tonight 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, especially 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
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 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:
Protect against locally hazardous surge having possible limited
impacts across portions of the Hawaiian Islands. 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 1200 PM HST, or sooner if conditions
warrant.

$$

Gibbs
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