Severe Tropical Storm Watch | Effective 08/20/2026 23:10

Headline: 
Tropical Storm Watch issued August 21 at 4:10PM ChST by NWS Tiyan GU
Event: 
Tropical Storm Watch
Urgency: 
Future
Effective: 
August 20, 2026 - 11:10pm
Expires: 
August 21, 2026 - 1:15pm
Description: 
* WHAT...For the Small Craft Advisory, west winds 15 to 25 kt with gusts up to 35 kt and seas 8 to 12 feet expected. For the Tropical Storm Watch, west winds 25 to 35 kt with gusts to 40 kt possible. * WHERE...Tinian Coastal Waters and Saipan Coastal Waters. * WHEN...For the Small Craft Advisory, from 5 PM this afternoon to 5 PM ChST Sunday. For the Tropical Storm Watch through Saturday night. * IMPACTS...Very strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility. * ADDITIONAL DETAILS...Tropical Storm Saudel (17W) is making its approach toward the Marianas, with a storm track across the far northern Marianas. Seas will remain hazardous to small craft this evening as winds increase to 25 kt and combined seas of 8 to 12 feet through Sunday afternoon. Tropical storm force winds of 34 to 63 kt are only possible if there is a significant westward shift in the track of Tropical Storm Saudel today or tonight.
Instruction: 
Inexperienced mariners, especially those operating smaller vessels, should avoid boating in hazardous conditions.
Area Description: 
Tinian Coastal Waters; Saipan Coastal Waters
Forcast Office: 
NWS Tiyan GU
Sender: 
w-nws.webmaster@noaa.gov