TROPICAL WEATHER STATEMENT
ISSUED: 5:03 AM JUL. 17, 2023 – NATIONAL WEATHER SERVICE
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.
TROPICAL STORM WATCH
ISSUED: 4:49 AM JUL. 17, 2023 – NATIONAL WEATHER SERVICE
...TROPICAL STORM WATCH IN EFFECT...
A Tropical Storm Watch means tropical storm-force winds are possible
somewhere within this area within the next 48 hours
* LOCATIONS AFFECTED
- Hilo
- Pahoa
- Volcano
* WIND
- LATEST LOCAL FORECAST: Equivalent Tropical Storm force wind
- Peak Wind Forecast: 30-40 mph with gusts to 55 mph
- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for wind 39
to 57 mph
- PLAN: Plan for hazardous wind of equivalent tropical storm
force.
- PREPARE: Efforts to protect property should now be
underway. Prepare for limited wind damage.
- ACT: Act now to complete preparations before the wind
becomes hazardous.
- POTENTIAL IMPACTS: Limited
- 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.
* STORM SURGE
- LATEST LOCAL FORECAST: Localized storm surge possible
- Peak Storm Surge Inundation: The potential for up to 2 feet
above ground somewhere within surge prone areas
- Window of concern: Tuesday evening until Wednesday afternoon
- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for storm
surge flooding greater than 1 foot above ground
- PLAN: Plan for storm surge flooding greater than 1 foot
above ground.
- PREPARE: Efforts should now be underway to prepare for
storm surge flooding, especially in low-lying vulnerable
areas.
- ACT: Take actions to protect life and property. Prepare to
leave if evacuation orders are given for your area.
- POTENTIAL IMPACTS: Limited
- 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
- LATEST LOCAL FORECAST: Flood Watch is in effect
- Peak Rainfall Amounts: Additional 4-8 inches, with locally
higher amounts
- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for
moderate flooding rain
- PLAN: Emergency plans should include the potential for
moderate flooding from heavy rain. Evacuations and rescues
are possible.
- PREPARE: Consider protective actions if you are in an area
vulnerable to flooding.
- ACT: Heed any flood watches and warnings. Failure to take
action may result in serious injury or loss of life.
- POTENTIAL IMPACTS: Significant
- 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.
* TORNADO
- LATEST LOCAL FORECAST:
- Situation is somewhat favorable for tornadoes
- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for a few
tornadoes
- PLAN: Emergency plans should include the potential for a
few tornadoes.
- PREPARE: If your shelter is particularly vulnerable to
tornadoes, prepare to relocate to safe shelter before
hazardous weather arrives.
- ACT: If a tornado warning is issued, be ready to shelter
quickly.
- POTENTIAL IMPACTS: Limited
- 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.
* FOR MORE INFORMATION:
-
https://www.weather.gov/hfo
TROPICAL STORM WATCH
ISSUED: 4:38 AM JUL. 17, 2023 – NATIONAL WEATHER SERVICE
...TROPICAL STORM WATCH REMAINS IN EFFECT...
* WHAT...Northeast to east winds 30 to 40 knots. Seas 12 to 18
feet.
* WHERE...Big Island Windward Waters.
* WHEN...Tropical storm force winds could begin as early as
Tuesday afternoon. Seas will build rapidly late Tuesday
afternoon, then peak Tuesday night.
* IMPACTS...Very strong winds will cause hazardous seas which
could capsize or damage vessels and reduce visibility.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Mariners should consider altering plans to avoid possible
hazardous conditions. Remain in port, seek safe harbor, alter
course, and/or secure the vessel for severe wind and seas.
&&
FLOOD WATCH
ISSUED: 4:01 AM JUL. 17, 2023 – NATIONAL WEATHER SERVICE
...FLOOD WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
AFTERNOON...
* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...Maui, Molokai, Lanai, Kahoolawe, and the Big Island.
* WHEN...From Tuesday evening through Wednesday afternoon.
* IMPACTS...Flood prone roads and other low lying areas may be
closed due to elevated runoff and overflowing streams. Urban areas
may receive more significant flooding and property damage due to
rapid runoff.
* ADDITIONAL DETAILS...
- Tropical Storm Calvin will produce periods of heavy rainfall
over all islands in Maui and Hawaii Counties from Tuesday
evening through Wednesday afternoon. Excessive rainfall may
lead to flooding conditions and landslides over steep
terrain, especially along east and southeast facing slopes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
