154
WHGM70 PGUM 301135
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
935 PM CHST WED SEP 30 2026
PMZ153-154-010145-
/O.NEW.PGUM.TR.A.4026.260930T1135Z-000000T0000Z/
/O.CON.PGUM.SC.Y.0069.261001T0700Z-261004T0700Z/
TINIAN COASTAL WATERS-SAIPAN COASTAL WATERS-
935 PM CHST WED SEP 30 2026
..TROPICAL STORM WATCH IS NOW IN EFFECT
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 5 PM THURSDAY TO
5 PM CHST SUNDAY...
* WHAT...FOR THE TROPICAL STORM WATCH AND SMALL CRAFT ADVISORY,
SOUTHWEST WINDS 30 TO 40 KT WITH GUSTS UP TO 55 KT AND SEAS 11
TO 16 FEET EXPECTED.
* WHERE...TINIAN AND SAIPAN COASTAL WATERS.
* WHEN...FOR THE SMALL CRAFT ADVISORY, FROM 5 PM THURSDAY TO 5 PM
CHST SUNDAY. FOR THE TROPICAL STORM WATCH BEGINNING THURSDAY EVENING.
* IMPACTS...TROPICAL STORM FORCE WINDS WILL CAUSE HAZARDOUS SEAS WHICH
COULD CAPSIZE OR DAMAGE VESSELS AND REDUCE VISIBILITY.
* ADDITIONAL DETAILS...TROPICAL DEPRESSION 26W CONTINUES TO DEVELOP
AS IT MOVES WESTWARD TOWARDS ANATAHAN AND ALAMAGAN. TD 26W IS
FORECASTED TO BECOME A TROPICAL STORM LATE TONIGHT OR EARLY TOMORROW
MORNING. TROPICAL STORM FORCE WINDS ARE EXPECTED TO EXPAND SOUTHWARD
OVER SAIPAN AND TINIAN THURSDAY EVENING. SEAS WILL BECOME HAZARDOUS
TO SMALL CRAFT BY THURSDAY AFTERNOON AND COULD BECOME HAZARDOUS BY
THURSDAY NIGHT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER
VESSELS, SHOULD AVOID BOATING IN HAZARDOUS CONDITIONS.
PMZ151-152-010145-
/O.CON.PGUM.SC.Y.0069.261001T0700Z-261004T0700Z/
GUAM COASTAL WATERS-ROTA COASTAL WATERS-
935 PM CHST WED SEP 30 2026
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 5 PM THURSDAY TO
5 PM CHST SUNDAY...
* WHAT...SOUTHWEST WINDS 20 TO 30 KT WITH GUSTS UP TO 40 KT AND
SEAS 10 TO 14 FEET EXPECTED.
* WHERE...MARIANAS COASTAL WATERS.
* WHEN...FROM 5 PM THURSDAY TO 5 PM CHST SUNDAY.
* IMPACTS...CONDITIONS WILL BE HAZARDOUS TO SMALL CRAFT.
* ADDITIONAL DETAILS...COMBINED SEAS WILL RAPIDLY INCREASE THROUGH
THURSDAY WITH 10 TO 12 FT FORECASTED THURSDAY NIGHT, PEAKING TO 14
FT OVER THE WEEKEND. WEST TO SOUTHWEST WINDS WILL BE FRESH TO
STRONG WITH GUSTS UP TO GALE-FORCE POSSIBLE. THE ONSET OF THESE
CONDITIONS IS NOT EXPECTED UNTIL THURSDAY EVENING, THEREFORE THE
SMALL CRAFT ADVISORY WILL BE IN EFFECT STARTING THURSDAY 5 PM CHST
AND CONTINUE THROUGH THE WEEKEND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER
VESSELS, SHOULD AVOID BOATING IN HAZARDOUS CONDITIONS.
WILLIAMS
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