The Northern Marianas is closely watching a tropical storm that threatens to become a typhoon.
Tropical Storm Conson has been tracking northwest towards Saipan with maximum sustained winds of 60 kilometres an hour.
The US National Weather Service in Guam said Tropical Storm Conson was expected to slowly strengthen through Saturday night.
At seven pm yesterday its centre was about one thousand kilometres east-northeast of Saipan.
It was expected to gradually strengthen over the next few days and may become a typhoon over the next couple of days.
Weather forecasters are warning mariners out on Guam's coastal waters to stay below deck if thunder was heard as dangerous lightning was possible along with the heavy showers.
NASA Measures Winds of Tropical Storm Conson— NASAHurricane (@NASAHurricane) August 11, 2016
NASA's RapidScat instrument provided measurements of sustained wind... https://t.co/hiBzIGs5yV