Guam, Northern Mariana Islands Flood Watch | Effective 04/11/2026 23:08

Headline: 
Flood Watch issued April 12 at 4:08PM ChST until April 15 at 10:00AM ChST by NWS Tiyan GU
Event: 
Flood Watch
Urgency: 
Future
Effective: 
April 11, 2026 - 11:08pm
Expires: 
April 12, 2026 - 7:15am
Description: 
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Guam, Rota, Saipan and Tinian. * WHEN...Through Wednesday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Typhoon Sinlaku is expected to approach the Marianas over the next 24 to 36 hours, crossing the islands on Tuesday, with rainfall amounts upwards of 15 to 20 inches possible near the center. - http://www.weather.gov/safety/flood
Instruction: 
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Area Description: 
Guam; Rota; Tinian; Saipan
Forcast Office: 
NWS Tiyan GU
Sender: 
w-nws.webmaster@noaa.gov