Extreme · Typhoon WarningActive alert
Typhoon Warning issued October 18 at 9:49AM ChST by NWS Tiyan GU
Affecting Guam Coastal Waters; Rota Coastal Waters
In effect until: Oct 18, 2026, 8:00 AM
Guam Coastal Waters; Rota Coastal Waters
Likely impact; effects through 8:00 AM.
Conditions will remain catastrophic for small craft, and extremely dangerous for any vessels of larger size over western waters of Guam and Rota. Waters will remain hazardous across the remainder of the waters. Stay in safe harbor until the all clear is given.
Read the original bulletin (official text)
* WHAT...Typhoon conditions, including winds of 64 knots or more will continue through this morning for Guam. Tropical Storm conditons will continue this morning for Rota. * WHERE...Guam and Rota Coastal Waters. * WHEN...Destructive typhoon force winds are occurring in western waters of Guam, but will decrease as Champi moves farther west out of the waters. The eye of Champi is now well outside of the coastal waters to the west. Damaging winds will continue into this evening, possibly to midnight. * IMPACTS...Destructive typhoon force and tropical storm 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...Super Typhoon Champi (29W) continues to move quickly away from the Marianas. Champi passed close to the southern tip of Guam, less than 10 NM, as a strong Category 4 storm. Champi is expected to strengthen further as it moves through the Philippine Sea, possibly becoming a Category 5 super typhoon. Seas are expected to remain hazardous through at least tonight, with significant sea heights as high as 24 feet over western waters, closest to Champi. Dangerous sea conditions may continue into Monday.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™