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Extreme · Typhoon WarningActive alert

Typhoon Warning issued October 17 at 11:12AM ChST by NWS Tiyan GU

Affecting Guam Coastal Waters; Rota Coastal Waters

In effect until: Oct 17, 2026, 8:00 PM

Guam Coastal Waters; Rota Coastal Waters

Likely impact; effects through 8:00 PM.

Prepare for the passage of a typhoon Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Tropical Storm Champi approaches, stay in safe harbor.

Read the original bulletin (official text)
* WHAT....Typhoon conditions, including winds of 64 knots or more
are expected.

* WHERE...Guam and Rota Coastal Waters.

* WHEN...Onset of damaging winds beginning Saturday night. Onset of
destructive winds Sunday morning. Damaging winds will continue into
at least Sunday night, possibly longer if conditions warrant.

* IMPACTS...Destructive winds will produce dangerous seas that
could damage, capsize or sink vessels, along with drastically
reducing visibilities in heavy rain.

* ADDITIONAL DETAILS...Typhoon Champi (29W) continues to move quickly
toward the Marianas. The exact path of 29W remains subject to
change. However, guidance supports a passage through Guam coastal
waters, with damaging winds moving in late tonight and lasting
into at least Sunday night. Champi is expected to strengthen
further today as it approaches, then move through the region as a
typhoon Sunday morning. Seas will quickly rise, with significant
sea heights reaching as high as 35 feet during closest passage of
Champi. Dangerous sea conditions may continue into Monday.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™