UPDATED: 3:38PM 10/20 Flash Flood & High Surf Advisories

Flash Flood Watch
Alert:
…FLASH FLOOD WATCH FOR MAUI COUNTY AND THE BIG ISLAND THROUGH 6AM TOMORROW.

The Flash Flood Watch continues for
* The Big Island.
* An approaching upper-level trough will enhance the deep
moisture already in place. Slow- moving and persistent heavy
showers and thunderstorms will result in the threat of flash
flooding.
* Heavy rainfall could result in low spots in roads becoming
dangerous and impassible due to severe runoff. Debris in
streams and gulches could clog bridges and culverts resulting
in dangerous flooding. Isolated landslides could also occur.
Instructions: A Flash Flood Watch means that conditions are favorable for flash flooding. Flash flooding is LIFE THREATENING. Do not cross fast flowing water in your vehicle or on foot. Monitor later forecasts and be prepared to take action if a Flash Flood Warning is issued. If you experience heavy rain or rising water, head to higher ground immediately.
Target Area:
Big Island Interior
Big Island North and East
Big Island Summit
Kohala
Kona
South Big Island

High Surf Advisory
Alert:
…HIGH SURF ADVISORY FOR SOUTH FACING SHORES OF ALL ISLANDS
THROUGH 6 PM MONDAY…
.A powerful storm in the southern hemisphere generated a long-
period south swell that will build today, peak tonight and Sunday,
then gradually diminish early next week.
…HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST MONDAY…
* SURF…5 to 8 feet this morning, building to 6 to 10 feet this
afternoon, then rising to 8 to 12 feet tonight and Sunday.
* TIMING…Building today, peaking tonight and Sunday, then slowly
diminishing on Monday.
* IMPACTS…Moderate…Expect strong breaking waves, shore break,
and rip currents making swimming difficult and dangerous.
Instructions: Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Know your limits and seek ocean recreation areas best suited for your abilities. Boaters should expect recreational surfers and body boarders utilizing harbor channels to access surfing areas.
Target Area:
Big Island North and East
Kahoolawe
Kauai Leeward
Kauai Windward
Kohala

Flash Flood Watch
Alert:
…FLASH FLOOD WATCH IN EFFECT FOR THE BIG ISLAND THROUGH
SATURDAY AFTERNOON…
The National Weather Service in Honolulu has issued a
* An approaching upper level disturbance will further destabilize
the air mass, with abundant low-level moisture already in place.
Slow-moving and persistent heavy showers and thunderstorms will
bring the threat of flash flooding.
* Heavy rainfall could result in low spots in roads becoming
dangerous and impassible due to severe runoff. Debris in streams
and gulches could clog bridges and culverts resulting in
dangerous flooding. Isolated landslides could also occur.
Instructions: A Flash Flood Watch means that conditions are favorable for flash flooding. Flash flooding is LIFE THREATENING. Do not cross fast flowing water in your vehicle or on foot. Monitor later forecasts and be prepared to take action if a Flash Flood Warning is issued. If you experience heavy rain or rising water, head to higher ground immediately.
Target Area:
Big Island Interior
Big Island North and East
Big Island Summit
Kohala
Kona
South Big Island

High Surf Advisory
Alert:
…HIGH SURF ADVISORY FOR SOUTH FACING SHORES OF ALL ISLANDS FROM
6 PM THIS EVENING TO 6 PM MONDAY…
.A powerful storm in the southern hemisphere generated a long-
period south swell will begin to arrive today, and then peak over
the weekend. The swell will remain elevated through Monday, then
gradually diminish.
…HIGH SURF ADVISORY FOR SOUTH FACING SHORES IN EFFECT FROM 6 PM
THIS EVENING TO 6 PM HST MONDAY…
The National Weather Service in Honolulu has issued a High Surf
Advisory, which is in effect from 6 PM this evening to 6 PM HST
Monday.
* SURF…increasing to 8 to 12 feet, with locally higher sets
possible.
* TIMING…gradually building today and tonight, and peaking over
the weekend.
* IMPACTS…Moderate…Expect strong breaking waves, shore break,
and rip currents making swimming difficult and dangerous.
Instructions: Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Know your limits and seek ocean recreation areas best suited for your abilities. Boaters should expect recreational surfers and body boarders utilizing harbor channels to access surfing areas.
Target Area:
Big Island North and East
Kohala