[Tropical] Hurricane Local Statement

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Tropical Storm Olivia Local Statement Advisory Number 48
National Weather Service Honolulu HI  EP172018
514 AM HST Wed Sep 12 2018

This product covers the Hawaiian islands

**OLIVIA MOVING WEST AND NEARING MAUI AND MOLOKAI**

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

* CHANGES TO WATCHES AND WARNINGS:
    - The Tropical Storm Warning has been cancelled for Big Island
      Interior, Big Island North and East, Big Island Summits,
      Kohala, Kona, and South Big Island

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Warning is in effect for Central Oahu,
      Haleakala Summit, Kahoolawe, 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, Waianae Coast,
      Waianae Mountains, and Windward Haleakala

* STORM INFORMATION:
    - About 140 miles east of Honolulu or about 50 miles
      east-northeast of Kahului
    - 21.2N 155.7W
    - Storm Intensity 45 mph
    - Movement West or 280 degrees at 12 mph

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

Tropical Storm Olivia will bring strong winds, heavy rainfall, and
high surf to much of the state today into tonight, with the potential
for additional heavy rainfall continuing through Thursday night.

Winds have increased to minimal tropical storm force near 40 mph with
gusts to 50 mph over parts of Maui County during the night. Tropical
storm force winds are expected to continue across Maui County and
spread across Oahu later today.

The mountainous terrain of the islands will produce localized areas of
highly enhanced winds away from the center of Olivia, which can cause
damage before the onset of more widespread tropical storm force winds.

Showers and areas of moderate to heavy rain will continue to increase
today, with flooding rainfall a significant threat through Thursday
night. Expect storm rainfall totals of 5 to 10 inches, with isolated
areas reaching up to 15 inches. Much of this rainfall will be focused
on windward areas of the islands, especially from Kauai through Maui.
However, flooding is still a significant threat for all areas,
particularly as Olivia moves through the islands.

Swells and surf generated by Olivia will remain at damaging levels
along east facing shores today. Surf heights along east facing shores
are expected to reach up to 20 feet on Oahu, Molokai, Maui and the Big
Island. Along the east facing shores of Kauai and Lanai, expect surf
to reach 10 to 14 feet. This surf is expected to result in significant
beach erosion and overwash onto vulnerable coastal roadways,
particularly during high tides.

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

* WIND:
Potential impacts from the main wind event are now unfolding across
Maui County and Oahu. Remain well sheltered from hazardous wind having
possible limited impacts. If realized, these impacts include:
    - Damage to porches, awnings, carports, sheds, and unanchored
      mobile homes. Unsecured lightweight objects blown about.
    - Many large tree limbs broken off. A few trees snapped or
      uprooted, but with greater numbers in places where trees are
      shallow rooted. Some fences and roadway signs blown over.
    - A few roads impassable from debris, particularly within urban
      or heavily wooded places. Hazardous driving conditions on
      bridges and other elevated roadways.
    - Scattered power and communications outages.

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

* FLOODING RAIN:
Potential impacts from the flooding rain are still unfolding across
Maui County and Oahu. Remain well guarded against life-threatening
flood waters having possible devastating impacts. If realized, these
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.

Potential impacts from the flooding rain are still unfolding across
the remainder of the Hawaiian islands. Remain well guarded against
life-threatening flood waters having possible extensive impacts. A Flash
Flood Watch remains in effect for the entire state through late Thursday
night.

* OTHER COASTAL HAZARDS:
Large and dangerous surf and strong rip currents will continue along east
facing shores. Prepare for overwash of low lying areas and roadways with
localized beach erosion around high tide. A High Surf Warning is in effect
for east facing shores of the Big Island, Maui, Molokai and Oahu, and a
High Surf Advisory is in effect for east facing shores of Lanai and
Kauai.

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 stay inside and away from windows. Listen for
updates and be ready in case you lose electrical power. Keep a
battery-powered radio, charged cell phone and flashlight handy.

During the peak of the storm be ready to move quickly. Keep your
shoes on and rain gear handy. Boots and athletic shoes offer the best
foot protection if you become unexpectedly exposed to the weather.

Keep your cell phone charged and in power-saving mode. If you lose
power, use it sparingly and mainly for personal emergencies and
check-ins.

If your location is prone to flooding, be prepared for the possibility
of a quick and dramatic rise in water levels.

* 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 AM HST, or sooner if conditions
warrant.

$$
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