WHGM70 PGUM 191908

MWWGUM



URGENT - MARINE WEATHER MESSAGE

National Weather Service Tiyan GU

508 AM ChST Fri Mar 20 2026



PMZ151>154-200700-

/O.CON.PGUM.SC.Y.0030.000000T0000Z-260320T0700Z/

Guam Coastal Waters-Rota Coastal Waters-Tinian Coastal Waters-

Saipan Coastal Waters-

508 AM ChST Fri Mar 20 2026



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

AFTERNOON...



* WHAT...Seas 8 to 10 feet.



* WHERE...Marianas Coastal Waters.



* WHEN...Until 5 PM ChST this afternoon.



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



* ADDITIONAL DETAILS...Building northeast to east swell,

  reinforced by diminishing long-period north to northeast swells

  from distant low pressure systems will continue to produce 

  hazardous seas up to 10 feet over Marianas coastal waters 

  through at least this afternoon. Overall, the long-period swells

  are gradually subsiding, but the building northeast to east 

  swell will keep seas elevated, potentially remaining at 

  hazardous levels of 8 to 10 feet over eastern coastal waters of 

  Tinian and Saipan through the weekend. Moderate to fresh winds 

  out of the northeast are expected through early next week.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid boating in hazardous conditions.



&&



$$



DeCou