Oahu North Shore Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Flash Flood Watch
Issued: 5:41 AM HST Aug. 21, 2018 – National Weather Service

... A Flash Flood Watch has been issued for the state of Hawaii...

Latest forecast models indicate that, regardless of the eventual
track and intensity of Lane, an extremely moist and unstable air
mass will move over the islands beginning Wednesday morning, and
will remain in place through the end of the week. This is expected
to result in very heavy rainfall, potentially leading to flash
flooding.

Higher confidence in the heavy rainfall and flooding threat from
Hurricane Lane has led to the issuance of a Flash Flood Watch for
the state of Hawaii at 5 am HST.

This will be the final hydrologic outlook issued for this event.
Further hydrologic threat information will be covered by flash
flood watches, flash flood warnings and flood advisories as
conditions warrant.


Rcb


541 am HST Tue Aug 21 2018

... A Flash Flood Watch has been issued for the state of Hawaii...

Latest forecast models indicate that, regardless of the eventual
track and intensity of Lane, an extremely moist and unstable air
mass will move over the islands beginning Wednesday morning, and
will remain in place through the end of the week. This is expected
to result in very heavy rainfall, potentially leading to flash
flooding.

Higher confidence in the heavy rainfall and flooding threat from
Hurricane Lane has led to the issuance of a Flash Flood Watch for
the state of Hawaii at 5 am HST.

This will be the final hydrologic outlook issued for this event.
Further hydrologic threat information will be covered by flash
flood watches, flash flood warnings and flood advisories as
conditions warrant.


Rcb

539 am HST Tue Aug 21 2018

... Flash Flood Watch in effect from Wednesday morning through
Friday afternoon...

The National Weather Service in Honolulu has issued a

* Flash Flood Watch for Kahoolawe, Kauai, Lanai, Maui, Molokai,
Niihau, Oahu and The Big Island.

* From Wednesday morning through Friday afternoon

* abundant moisture from Hurricane Lane is expected to move over
The Big Island late Wednesday and spreading to the rest of the
islands through Friday. Intense rainfall will be possible,
especially along southeast and east facing slopes. The risk of
flooding will only increase as Hurricane Lane approaches.

* In addition to flood prone areas, heavy rain events of this size
may cause flooding in areas outside of designated flood zones.
Low spots in roads will become dangerous and impassible due to
severe runoff. High amounts of debris in streams and gulches may
clog bridges and culverts resulting in dangerous flooding
outside the normal channels and significant property damage.

Precautionary/preparedness actions...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should flash flood warnings be issued.




Flash Flood Watch
Issued: 5:41 AM HST Aug. 21, 2018 – National Weather Service

... A Flash Flood Watch has been issued for the state of Hawaii...

Latest forecast models indicate that, regardless of the eventual
track and intensity of Lane, an extremely moist and unstable air
mass will move over the islands beginning Wednesday morning, and
will remain in place through the end of the week. This is expected
to result in very heavy rainfall, potentially leading to flash
flooding.

Higher confidence in the heavy rainfall and flooding threat from
Hurricane Lane has led to the issuance of a Flash Flood Watch for
the state of Hawaii at 5 am HST.

This will be the final hydrologic outlook issued for this event.
Further hydrologic threat information will be covered by flash
flood watches, flash flood warnings and flood advisories as
conditions warrant.


Rcb


541 am HST Tue Aug 21 2018

... A Flash Flood Watch has been issued for the state of Hawaii...

Latest forecast models indicate that, regardless of the eventual
track and intensity of Lane, an extremely moist and unstable air
mass will move over the islands beginning Wednesday morning, and
will remain in place through the end of the week. This is expected
to result in very heavy rainfall, potentially leading to flash
flooding.

Higher confidence in the heavy rainfall and flooding threat from
Hurricane Lane has led to the issuance of a Flash Flood Watch for
the state of Hawaii at 5 am HST.

This will be the final hydrologic outlook issued for this event.
Further hydrologic threat information will be covered by flash
flood watches, flash flood warnings and flood advisories as
conditions warrant.


Rcb

539 am HST Tue Aug 21 2018

... Flash Flood Watch in effect from Wednesday morning through
Friday afternoon...

The National Weather Service in Honolulu has issued a

* Flash Flood Watch for Kahoolawe, Kauai, Lanai, Maui, Molokai,
Niihau, Oahu and The Big Island.

* From Wednesday morning through Friday afternoon

* abundant moisture from Hurricane Lane is expected to move over
The Big Island late Wednesday and spreading to the rest of the
islands through Friday. Intense rainfall will be possible,
especially along southeast and east facing slopes. The risk of
flooding will only increase as Hurricane Lane approaches.

* In addition to flood prone areas, heavy rain events of this size
may cause flooding in areas outside of designated flood zones.
Low spots in roads will become dangerous and impassible due to
severe runoff. High amounts of debris in streams and gulches may
clog bridges and culverts resulting in dangerous flooding
outside the normal channels and significant property damage.

Precautionary/preparedness actions...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should flash flood warnings be issued.




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