[Tropical] Hurricane Local Statement

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Tropical Storm Calvin Local Statement Advisory Number 24
National Weather Service Honolulu HI  EP032023
502 AM HST Mon Jul 17 2023

This product covers the Hawaiian islands

**CALVIN ENTERS THE CENTRAL PACIFIC**
**TROPICAL STORM WATCH ISSUED FOR THE BIG ISLAND**

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

* CHANGES TO WATCHES AND WARNINGS:
    - A Tropical Storm Watch has been issued for Big Island East, Big
      Island Interior, Big Island North, Big Island South, Big Island
      Southeast, Big Island Summits, Kohala, and Kona

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Watch is in effect for Big Island East, Big
      Island Interior, Big Island North, Big Island South, Big Island
      Southeast, Big Island Summits, Kohala, and Kona

* STORM INFORMATION:
    - About 1120 miles east-southeast of Honolulu or about 920 miles
      east of Hilo
    - 16.8N 141.4W
    - Storm Intensity 50 mph
    - Movement West or 280 degrees at 18 mph

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

The center of Tropical Storm Calvin is forecast to pass over, or very
close to, the Big Island of Hawaii from Tuesday night into Wednesday.
Calvin is expected to weaken as it moves westward to the south of the
other Hawaiian Islands Wednesday and Wednesday night, bringing the
potential for some peripheral impacts.

Primary impacts are expected on the Big Island, where a period of
heavy rainfall is expected, as well as high surf along east facing
shores, and locally strong wind gusts.

Flooding rain will be possible as early as Tuesday evening on the Big
Island, and chances for heavy rain is expected to increase for much of
the state Tuesday night and Wednesday. Expect storm total rainfall of
4 to 8 inches across mainly windward portions of the Big Island, with
about 1 to 4 inches of rainfall elsewhere.

Coastal impacts associated with Calvin will include rapidly building
surf Tuesday night through Wednesday. Surf heights will reach High
Surf Advisory levels for most windward coasts, potentially reaching
High Surf Warning levels (greater than 15 feet) along east facing
shores of the Big Island. Although peak surf heights on the Big Island
will likely occur around low tide Wednesday morning, some minor
overwash and erosion is possible for exposed low-lying coastal areas.

Locally strong winds may begin as early as Tuesday evening across
parts of the Big Island, with north winds shifting to the northeast
and east as Calvin moves westward. Winds will primarily be
northeasterly over the smaller islands, strongest Wednesday and
Wednesday night. It is important to note that the mountainous terrain
of the islands can produce localized areas of enhanced winds, even
well away from the tropical cyclone center.


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

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
winds, large surf, storm surge, and tornadoes extend well away from
the center of the storm.

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

* WIND:
Prepare for dangerous wind having possible significant imp acts across
portions of the Big Island. 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.

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

* SURGE:
Prepare for locally hazardous surge having possible limited impacts
across portions of windward and southeast Big Island. 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:
Prepare for dangerous rainfall flooding having possible significant
impacts across mainly windward and southeastern portions of the Big
Island. Potential impacts include:
    - Moderate rainfall flooding may prompt several evacuations and
      rescues.
    - Rivers and tributaries may quickly become swollen with swifter
      currents and overspill their banks in a few places, especially
      in usually vulnerable spots. Small streams, creeks, canals,
      arroyos, and ditches overflow.
    - Flood waters can enter some structures or weaken foundations.
      Several places may experience expanded areas of rapid
      inundation at underpasses, low-lying spots, and poor drainage
      areas. Some streets and parking lots take on moving water as
      storm drains and retention ponds overflow. Driving conditions
      become hazardous. Some road and bridge closures.

Prepare for locally hazardous rainfall flooding having possible
limited impacts across other Hawaiian Islands from Kauai to Maui.

* TORNADOES:
Prepare for a tornado event having possible limited impacts across
the Hawaiian islands. Potential impacts include:
    - The occurrence of isolated tornadoes can hinder the execution
      of emergency plans during tropical events.
    - A few places may experience tornado damage, along with power
      and communications disruptions.
    - Locations could realize roofs peeled off buildings, chimneys
      toppled, mobile homes pushed off foundations or overturned,
      large tree tops and branches snapped off, shallow-rooted trees
      knocked over, moving vehicles blown off roads, and small boats
      pulled from moorings.

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

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.

NEXT UPDATE
-----------

The next local statement will be issued by the National Weather
Service in Honolulu HI around NOON HST, or sooner if conditions
warrant.

$$

Birchard
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