WHGM70 PGUM 210650

MWWGUM



URGENT - MARINE WEATHER MESSAGE

National Weather Service Tiyan GU

450 PM ChST Sat Mar 21 2026



PMZ153-154-212200-

/O.CON.PGUM.SC.Y.0031.000000T0000Z-260322T0700Z/

Tinian Coastal Waters-Saipan Coastal Waters-

450 PM ChST Sat Mar 21 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST

SUNDAY...



* WHAT...Northeast winds 20 kt and seas 8 to 10 feet.



* WHERE...Tinian and Saipan Coastal Waters.



* WHEN...Until 5 PM ChST Sunday.



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



* ADDITIONAL DETAILS...Elevated northeast to east swell and wind

  waves, reinforced by diminishing long-period north to northeast

  swell will produce seas up to 10 feet within the eastern

  Marianas coastal waters. Combined seas may briefly diminish

  around Sunday night, increasing once more Monday and Monday

  night as the northeast swell and wind waves are reinforced by a

  building trade-wind surge. An extension or another issuance of a

  Small Craft Advisory will likely be needed for hazardous

  conditions on Monday and Monday night.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid boating in hazardous conditions.



&&



$$



PMZ151-152-212200-

/O.CON.PGUM.SC.Y.0031.260321T1200Z-260322T0700Z/

Guam Coastal Waters-Rota Coastal Waters-

450 PM ChST Sat Mar 21 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING

TO 5 PM CHST SUNDAY...



* WHAT...Northeast winds around 20 kt with gusts up to 25 kt and

  seas 8 to 10 feet expected.



* WHERE...Guam and Rota Coastal Waters.



* WHEN...From 10 PM this evening to 5 PM ChST Sunday.



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



* ADDITIONAL DETAILS...Elevated northeast to east swell and wind

  waves, reinforced by diminishing long-period north to northeast

  swell will produce seas up to 10 feet within the eastern

  Marianas coastal waters. Combined seas may briefly diminish

  around Sunday night, increasing once more Monday and Monday

  night as the northeast swell and wind waves are reinforced by a

  building trade-wind surge. An extension or another issuance of a

  Small Craft Advisory will likely be needed for hazardous

  conditions on Monday and Monday night.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid boating in hazardous conditions.



&&



$$



Cruz