WWA Summary for All Issued by GUM

Gale Warning

URGENT - MARINE WEATHER MESSAGE
National Weather Service Tiyan GU
504 AM ChST Sun Oct 4 2026

PMZ153-154-040600-
/O.CON.PGUM.GL.W.0004.000000T0000Z-261004T0600Z/
Tinian Coastal Waters-Saipan Coastal Waters-
504 AM ChST Sun Oct 4 2026

...GALE WARNING REMAINS IN EFFECT UNTIL 4 PM CHST THIS
AFTERNOON...

* WHAT...Southwest winds 30 kt with frequent gusts to 40 kt and
  seas 14 to 16 feet.

* WHERE...Tinian and Saipan Coastal Waters.

* WHEN...Until 4 PM ChST Sunday.

* IMPACTS...Strong winds will cause hazardous seas which could
  capsize or damage vessels and reduce visibility.

* ADDITIONAL DETAILS...As Typhoon Choi-wan (26W) moves north-
  northeast and away from the islands, a strong monsoon surge will
  continue across the area. Strong to near-gale force winds with
  frequent gale-force gusts will continue over Tinian and Saipan
  coastal waters through this afternoon, gradually diminishing
  through tonight.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A gale warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels.

$$

DeCou

High Surf Advisory

Coastal Hazard Message
National Weather Service Tiyan GU
359 AM ChST Sun Oct 4 2026

GUZ001-MPZ001-040800-
/O.CON.PGUM.SU.Y.0057.000000T0000Z-261005T0600Z/
/O.CON.PGUM.RP.S.0022.000000T0000Z-261005T0600Z/
Guam-Rota-
359 AM ChST Sun Oct 4 2026

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 PM CHST MONDAY...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH MONDAY
AFTERNOON...

* WHAT...For the High Surf Advisory, large breaking waves of 7 to
  10 feet in the surf zone. For the High Rip Current Risk,
  dangerous rip currents.

* WHERE...North, south, and west facing reefs of Guam and Rota.

* WHEN...Until 4 PM ChST Monday.

* IMPACTS...Dangerous swimming and surfing conditions and
  localized beach erosion. Rip currents can sweep even the best
  swimmers away from shore into deeper water.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Rip currents will be life threatening. Inexperienced swimmers
should remain out of the water due to dangerous surf conditions.

Rip currents will be life threatening. If caught in a rip
current, relax and float. Don`t swim against the current. If
able, swim in a direction following the shoreline. If unable to
escape, face the shore and call or wave for help.

&&

$$

DeCou

Coastal Hazard Message
National Weather Service Tiyan GU
359 AM ChST Sun Oct 4 2026

MPZ002-003-040800-
/O.CON.PGUM.SU.Y.0057.000000T0000Z-261005T0600Z/
/O.CON.PGUM.CF.S.0009.000000T0000Z-261005T0600Z/
/O.CON.PGUM.RP.S.0022.000000T0000Z-261005T0600Z/
Tinian-Saipan-
359 AM ChST Sun Oct 4 2026

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 PM CHST MONDAY...
...COASTAL FLOOD STATEMENT REMAINS IN EFFECT THROUGH MONDAY
AFTERNOON...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH MONDAY
AFTERNOON...

* WHAT...For the High Surf Advisory, large breaking waves of 9 to
  12 feet in the surf zone. For the High Rip Current Risk,
  dangerous rip currents. For the Coastal Flood Statement,
  isolated minor coastal flooding.

* WHERE...North, south, and west facing reefs of Tinian and
  Saipan.

* WHEN...Until 4 PM ChST Monday.

* IMPACTS...Some water on low lying roads and property. Dangerous
  swimming and surfing conditions and localized beach erosion. Rip
  currents can sweep even the best swimmers away from shore into
  deeper water.

* ADDITIONAL DETAILS...Elevated swells emanating from the
  southwesterly monsoon surge and Typhoon Choi-wan (26W) to the
  north will allow advisory-level surf and a high risk of rip
  currents to continue longer than previously anticipated. A
  Coastal Flood Statement remains in effect as minor coastal
  flooding is expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Rip currents will be life threatening. Inexperienced swimmers
should remain out of the water due to dangerous surf conditions.

Rip currents will be life threatening. If caught in a rip
current, relax and float. Don`t swim against the current. If able,
swim in a direction following the shoreline. If unable to escape,
face the shore and call or wave for help.

&&

$$

Small Craft Advisory

URGENT - MARINE WEATHER MESSAGE
National Weather Service Tiyan GU
504 AM ChST Sun Oct 4 2026

PMZ151-152-040900-
/O.EXP.PGUM.SE.W.0007.000000T0000Z-261003T1900Z/
/O.NEW.PGUM.SC.Y.0071.261003T1904Z-261006T0700Z/
Guam Coastal Waters-Rota Coastal Waters-
504 AM ChST Sun Oct 4 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 5 PM CHST TUESDAY...
...HAZARDOUS SEAS WARNING HAS EXPIRED...

* WHAT...Southwest winds 20 to 30 kt with gusts up to 40 kt and
  seas 10 to 14 feet expected.

* WHERE...Guam and Rota Coastal Waters.

* WHEN...Until 5 PM ChST Tuesday.

* IMPACTS...Strong winds can cause hazardous seas which could
  capsize or damage vessels and reduce visibility.

* ADDITIONAL DETAILS...Combined seas have diminished below 15 feet
  as Typhoon Choi-wan moves farther away and the Hazardous Seas
  Warning has been expired, but will remain hazardous to small
  craft through the next few days as they remain elevated. So, a
  Small Craft Advisory is now in effect.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Wind Advisory

URGENT - WEATHER MESSAGE
National Weather Service Tiyan GU
343 AM ChST Sun Oct 4 2026

MPZ002-003-040145-
/O.CON.PGUM.WI.Y.0008.000000T0000Z-261004T1200Z/
Tinian-Saipan-
343 AM ChST Sun Oct 4 2026

...WIND ADVISORY REMAINS IN EFFECT UNTIL 10 PM CHST THIS EVENING...

* WHAT...Southwest winds 20 to 30 mph with gusts up to 45 mph.

* WHERE...Tinian and Saipan.

* WHEN...Until 10 PM ChST this evening.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution when driving on roads with no
center barriers, as well as when passing high profile vehicles.

&&

$$

DD

Rip Current Statement

Coastal Hazard Message
National Weather Service Tiyan GU
359 AM ChST Sun Oct 4 2026

GUZ001-MPZ001-040800-
/O.CON.PGUM.SU.Y.0057.000000T0000Z-261005T0600Z/
/O.CON.PGUM.RP.S.0022.000000T0000Z-261005T0600Z/
Guam-Rota-
359 AM ChST Sun Oct 4 2026

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 PM CHST MONDAY...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH MONDAY
AFTERNOON...

* WHAT...For the High Surf Advisory, large breaking waves of 7 to
  10 feet in the surf zone. For the High Rip Current Risk,
  dangerous rip currents.

* WHERE...North, south, and west facing reefs of Guam and Rota.

* WHEN...Until 4 PM ChST Monday.

* IMPACTS...Dangerous swimming and surfing conditions and
  localized beach erosion. Rip currents can sweep even the best
  swimmers away from shore into deeper water.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Rip currents will be life threatening. Inexperienced swimmers
should remain out of the water due to dangerous surf conditions.

Rip currents will be life threatening. If caught in a rip
current, relax and float. Don`t swim against the current. If
able, swim in a direction following the shoreline. If unable to
escape, face the shore and call or wave for help.

&&

$$

DeCou

Coastal Hazard Message
National Weather Service Tiyan GU
359 AM ChST Sun Oct 4 2026

MPZ002-003-040800-
/O.CON.PGUM.SU.Y.0057.000000T0000Z-261005T0600Z/
/O.CON.PGUM.CF.S.0009.000000T0000Z-261005T0600Z/
/O.CON.PGUM.RP.S.0022.000000T0000Z-261005T0600Z/
Tinian-Saipan-
359 AM ChST Sun Oct 4 2026

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 PM CHST MONDAY...
...COASTAL FLOOD STATEMENT REMAINS IN EFFECT THROUGH MONDAY
AFTERNOON...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH MONDAY
AFTERNOON...

* WHAT...For the High Surf Advisory, large breaking waves of 9 to
  12 feet in the surf zone. For the High Rip Current Risk,
  dangerous rip currents. For the Coastal Flood Statement,
  isolated minor coastal flooding.

* WHERE...North, south, and west facing reefs of Tinian and
  Saipan.

* WHEN...Until 4 PM ChST Monday.

* IMPACTS...Some water on low lying roads and property. Dangerous
  swimming and surfing conditions and localized beach erosion. Rip
  currents can sweep even the best swimmers away from shore into
  deeper water.

* ADDITIONAL DETAILS...Elevated swells emanating from the
  southwesterly monsoon surge and Typhoon Choi-wan (26W) to the
  north will allow advisory-level surf and a high risk of rip
  currents to continue longer than previously anticipated. A
  Coastal Flood Statement remains in effect as minor coastal
  flooding is expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Rip currents will be life threatening. Inexperienced swimmers
should remain out of the water due to dangerous surf conditions.

Rip currents will be life threatening. If caught in a rip
current, relax and float. Don`t swim against the current. If able,
swim in a direction following the shoreline. If unable to escape,
face the shore and call or wave for help.

&&

$$

Flood Watch

Flood Watch
National Weather Service Tiyan GU
530 PM ChST Sat Oct 3 2026

GUZ001-MPZ001>003-032015-
/O.CON.PGUM.FA.A.0006.000000T0000Z-261004T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Guam-Rota-Tinian-Saipan-
530 PM ChST Sat Oct 3 2026

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE SUNDAY NIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Guam, Rota, Saipan and Tinian.

* WHEN...Through late Sunday night.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Flooding may occur in poor drainage and urban areas.

* ADDITIONAL DETAILS...
  - Typhoon Choi-wan (26W) is steadily moving northeast and away from
    the Marianas. To the south of Choi-wan, surging monsoon inflow
    will maintain wet conditions through Sunday, resulting in 3 to 5
    inches of rain for Guam and Rota, and 4 to 6 inches for Tinian
    and Saipan during the Watch period.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

TM

Coastal Flood Statement

Coastal Hazard Message
National Weather Service Tiyan GU
359 AM ChST Sun Oct 4 2026

MPZ002-003-040800-
/O.CON.PGUM.SU.Y.0057.000000T0000Z-261005T0600Z/
/O.CON.PGUM.CF.S.0009.000000T0000Z-261005T0600Z/
/O.CON.PGUM.RP.S.0022.000000T0000Z-261005T0600Z/
Tinian-Saipan-
359 AM ChST Sun Oct 4 2026

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 PM CHST MONDAY...
...COASTAL FLOOD STATEMENT REMAINS IN EFFECT THROUGH MONDAY
AFTERNOON...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH MONDAY
AFTERNOON...

* WHAT...For the High Surf Advisory, large breaking waves of 9 to
  12 feet in the surf zone. For the High Rip Current Risk,
  dangerous rip currents. For the Coastal Flood Statement,
  isolated minor coastal flooding.

* WHERE...North, south, and west facing reefs of Tinian and
  Saipan.

* WHEN...Until 4 PM ChST Monday.

* IMPACTS...Some water on low lying roads and property. Dangerous
  swimming and surfing conditions and localized beach erosion. Rip
  currents can sweep even the best swimmers away from shore into
  deeper water.

* ADDITIONAL DETAILS...Elevated swells emanating from the
  southwesterly monsoon surge and Typhoon Choi-wan (26W) to the
  north will allow advisory-level surf and a high risk of rip
  currents to continue longer than previously anticipated. A
  Coastal Flood Statement remains in effect as minor coastal
  flooding is expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Rip currents will be life threatening. Inexperienced swimmers
should remain out of the water due to dangerous surf conditions.

Rip currents will be life threatening. If caught in a rip
current, relax and float. Don`t swim against the current. If able,
swim in a direction following the shoreline. If unable to escape,
face the shore and call or wave for help.

&&

$$