Alert USA
weather NWS severe Tinian Coastal Waters; Saipan Coastal Waters October 17, 2026 at 11:49 PM

Tropical Storm Warning

* WHAT...Tropical storm conditions, including winds of 34 to 63 knots, are expected.

* WHERE...Tinian and Saipan Coastal Waters.

* WHEN...Damaging winds will continue into this afternoon, possibly longer if Champi slows down.

* IMPACTS...Damaging tropical storm force winds will produce dangerous 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 this afternoon, with significant sea heights as high as 20 feet over western waters, closest to Champi. Dangerous sea conditions may continue into Monday.

A hurricane or tropical storm in Tinian Coastal Waters; Saipan Coastal Waters brings damaging wind, heavy rain, storm surge, and the risk of extended power loss. Travel and supply runs can become difficult or impossible.

This report is based on information from NWS, monitored by Alert USA's verified emergency feed.

Alert USA anticipates a high chance of travel disruptions, elevated property risk in low-lying areas, and possible power outages while the event is active.

Recommended steps: avoid flooded roads — turn around, don't drown; move to higher ground if you are in a low-lying area; charge phones and prepare for power loss; check on family and neighbors.

Alert USA is tracking this tropical storm system and will update this report as verified information becomes available.

Verified by Alert USA • NWS

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