Tropical Storm Warning

Offshore Waters Forecast for Hawaii
National Weather Service Honolulu HI
1119 AM HST Fri Aug 21 2026

Hawaiian offshore waters beyond 40 nautical miles out to 240
nautical miles including the portion of the Papahanaumokuakea
Marine National Monument east of French Frigate Shoals

Seas given as significant wave height, which is the average height
of the highest 1/3 of the waves. Individual waves may be more than
twice the significant wave height.

PHZ180-220445-
Hawaiian Offshore Waters-
1119 AM HST Fri Aug 21 2026

...TROPICAL STORM WARNING IN EFFECT...

.THIS AFTERNOON...E of 160W, E winds 10 to 20 kt. W of 160W, E
winds up to 10 kt, rising to 10 to 15 kt late in the afternoon.
Seas 6 to 7 ft.
.TONIGHT...E winds 15 to 25 kt E of 160W, E 10 to 15 kt W of
160W. Seas 6 to 9 ft.
.SATURDAY...E winds 10 to 20 kt NW Half, NE 20 to 30 kt SE Half.
Seas 6 to 9 ft, building to 6 to 11 ft in the afternoon. Isolated
thunderstorms SE Waters.
.SATURDAY NIGHT...Tropical Storm Moke entering far S waters. E
winds 15 to 25 kt NW Half, E 35 to 45 kt SE Half. Seas 6 to 12 ft.
Isolated thunderstorms SE Waters.
.SUNDAY...E winds 15 to 25 kt NW Half, E 30 to 40 kt SE Half.
Seas 7 to 12 ft. Isolated thunderstorms SE Waters.
.MONDAY...E winds 10 to 20 kt N of 20N, E 20 to 30 kt elsewhere.
Seas 6 to 9 ft. Isolated thunderstorms S of 24N.
.TUESDAY...E winds 10 to 20 kt. Seas 6 to 7 ft. Isolated
thunderstorms S of 24N.

$$

Small Craft Advisory

URGENT - MARINE WEATHER MESSAGE
National Weather Service Honolulu HI
324 PM HST Fri Aug 21 2026

PHZ119>121-123-124-221430-
/O.NEW.PHFO.SC.Y.0035.260822T0124Z-260823T0400Z/
Maalaea Bay-Pailolo Channel-Alenuihaha Channel-
Big Island Leeward Waters-Big Island Southeast Waters-
324 PM HST Fri Aug 21 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 PM HST SATURDAY...

* WHAT...Northeast winds up to 25 kt.

* WHERE...Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big
  Island Leeward Waters and Big Island Southeast Waters.

* WHEN...Until 6 PM HST Saturday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in these conditions.

&&

$$

Flood Watch

Flood Watch
National Weather Service Honolulu HI
245 PM HST Fri Aug 21 2026

.Tropical Storm Moke will bring areas of heavy rain to portions of
the Big Island late Saturday night through Monday afternoon.

HIZ023-026>028-051>054-230415-
/O.CON.PHFO.FA.A.0010.260823T1000Z-260825T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kona-Kohala-Big Island Interior-Big Island Summits-Big Island
South-Big Island Southeast-Big Island East-Big Island North-
245 PM HST Fri Aug 21 2026

...FLOOD WATCH REMAINS IN EFFECT FROM LATE SATURDAY NIGHT THROUGH
MONDAY AFTERNOON...

* WHAT...Flash flooding caused by excessive rainfall is possible for
  windward and southeast Big Island.

* WHERE...The Big Island.

* WHEN...From late Saturday night through Monday 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 Moke is forecast to bring periods of heavy rain to
    the Big Island from late Saturday night through Monday afternoon.
    Rainfall totals of 5 to 10 inches, locally up to 15 inches, are
    possible over the windward and southeast slopes of the Big
    Island. It will not take a significant amount of rain to cause
    flash flooding due to saturated grounds from recent heavy rain.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

JVC