Severe Tropical Storm Warning | Effective 09/30/2026 18:19

Headline: 
Tropical Storm Warning issued October 1 at 11:19AM ChST by NWS Tiyan GU
Event: 
Tropical Storm Warning
Urgency: 
Immediate
Effective: 
September 30, 2026 - 6:19pm
Expires: 
October 1, 2026 - 8:30am
Description: 
* WHAT...Southwest winds 25 to 35 kt with gusts up to 55 kt and seas 11 to 16 feet. * WHERE...Tinian Coastal Waters and Saipan Coastal Waters. * WHEN...Until further notice. * IMPACTS...Very strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility. * ADDITIONAL DETAILS...Tropical Storm Choi-wan (26W) continues to develop as it moves westward towards Anatahan and Alamagan. Tropical storm force winds may expand southward over Saipan and Tinian tonight. Seas will become hazardous to small craft by this afternoon and could become hazardous by tonight.
Instruction: 
A tropical storm warning means sustained winds of 34 to 63 kt are expected due to a tropical storm within 36 hours.
Area Description: 
Tinian Coastal Waters; Saipan Coastal Waters
Forcast Office: 
NWS Tiyan GU
Sender: 
w-nws.webmaster@noaa.gov