WHGM70 PGUM 161146
MWWGUM

URGENT - MARINE WEATHER MESSAGE
National Weather Service Tiyan GU
946 PM ChST Thu Apr 16 2026

PMZ152>154-170200-
/O.CON.PGUM.TY.W.4004.000000T0000Z-000000T0000Z/
Rota Coastal Waters-Tinian Coastal Waters-Saipan Coastal Waters-
946 PM ChST Thu Apr 16 2026

...TYPHOON WARNING REMAINS IN EFFECT...

* WHAT...Typhoon Warning. For Rota, tropical storm force winds to
  35 kt, with gusts to 45 kt. Seas will continue to slowly subside
  and are between 17 and 22 feet. For Tinian and Saipan, tropical
  storm winds of up to 45 kt with gusts to 55 kt. Seas are now
  subsiding and are between 19 and 26 feet.

* WHERE...Rota, Tinian, and Saipan Coastal Waters.

* WHEN...Through at least this evening for Rota, through at least
  Friday morning for Tinian and Saipan.

* IMPACTS...Conditions will be catastrophic for small craft and
  dangerous for large vessels. Remain in safe harbor.

* ADDITIONAL DETAILS...Tropical storm winds of 40 kt are
  occurring for northern Rota waters, decreasing to 35 kt over
  southern waters. Winds of 50 kt are currently over the northern
  waters of Tinian and Saipan, with 40 kt over southern waters.
  Winds and seas will continue to decrease over the next 24 hours.
  Seas will be highest over the northern portions of the waters.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A typhoon warning means sustained winds of 64 kt or 74 mph or
greater are expected or occurring.

&&

$$

PMZ151-170200-
/O.CON.PGUM.SE.W.0004.000000T0000Z-260417T0700Z/
/O.CON.PGUM.SC.Y.0039.000000T0000Z-260418T0700Z/
Guam Coastal Waters-
946 PM ChST Thu Apr 16 2026

...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 5 PM CHST
FRIDAY...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST
SATURDAY...

* WHAT...For the Hazardous Seas Warning, very steep and hazardous
  seas 12 to 18 feet. For the Small Craft Advisory, west winds
  20 to 30 kt with occasional gusts up to 40 kt.

* WHERE...Guam Coastal Waters.

* WHEN...For the Hazardous Seas Warning, until 5 PM ChST Friday.
  For the Small Craft Advisory, until 5 PM ChST Saturday.

* IMPACTS...Very steep and hazardous seas could capsize or cause
  damage to vessels.

* ADDITIONAL DETAILS...Typhoon Sinlaku has now moved far enough
  away for winds to fall below tropical storm conditions. Seas will
  be slower to subside and Small Craft Advisory winds will continue
  into the weekend.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid boating in hazardous conditions.

&&

$$

Williams