A developing circulation is expected to pass through the Northern Marianas region as early as Monday, bringing thunderstorms and stronger winds to Guam.

At 8 p.m. Saturday, the National Weather Service Guam office issued a typhoon watch for Alamagan, a tropical storm watch for Rota, Tinian, Saipan, Pagan and Agrigan.

There are no watches for Guam. However, NWS meteorologist Brandon Aydlett said “We don’t want to give anyone a false sense of security because any small shift north or south could change weather conditions to our islands dramatically.”

Aydlett encouraged Guamanians to, at the minimum, prepare for heavy rains.

"We'll be working on hydrological reports so people can have a better idea of what to expect," he said.

However, he reiterated that residents should watch for weather updates so they can be prepared as much as possible for any outcome. 

As of 7 p.m. Saturday, the circulation was east of Guam and about 970 miles east of Saipan, near 15 degrees north latitude and 161 degrees east longitude. It was moving west about 17 mph.

Meteorologists expect the circulation to develop and expect it to reach Alamagan around Monday night.

Residents of Guam and Rota can expect stronger winds and thunderstorms.

Meteorologists said the stronger winds will cause seas to build early in the week.

“The community is advised to heed any additional advisories in the coming days and be prepared to take action, if needed,” Homeland and Civil Defense officials stated.

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