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Extreme · Typhoon WarningActive alert

Typhoon Warning issued October 17 at 10:39PM ChST by NWS Tiyan GU

Affecting Guam Coastal Waters; Rota Coastal Waters

In effect until: Oct 18, 2026, 2:45 AM

Guam Coastal Waters; Rota Coastal Waters

Likely impact; effects through 2:45 AM.

Prepare for the passage of a category 4 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 Typhoon 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...Damaging winds are occurring in eastern waters, and will
begin later tonight in western waters. Onset of destructive winds
after midnight with typhoon force winds early Sunday morning.
Damaging winds will continue into at least Sunday night, especially
if Champi slows down.

* IMPACTS...Destructive to typhoon force winds will produce
dangerous to deadly 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, a little south of Guam, with damaging winds moving in late
tonight and lasting into at least Sunday night. Champi is expected
to strengthen further as it approaches, then move through the
region as a category 4 super typhoon Sunday morning. Seas are
quickly rising, with significant sea heights reaching as high as
35 feet near the eye wall of Champi. Dangerous sea conditions may
continue into Monday.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™