https://phys.org/news/2018-08-nasa-power-tropical-storm-shanshan.html

Today, Aug. 3 EDT, the National Weather Service (NWS) in Tiyan, Guam stated that a Tropical Storm Warning remains in effect for Agrihan, Pagan and Alamagan in the Northern Commonwealth of the Northern Mariana Islands. At 8:00 a.m. EDT (1200 UTC) the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA's Terra satellite analyzed Tropical Storm Shanshan s cloud top temperatures in infrared light. MODIS found cloud top temperatures of strongest thunderstorms were as cold as or colder than minus 80 degrees Fahrenheit (minus 62.2 Celsius) around the center. Cloud top temperatures that cold indicate strong storms that have the capability to create heavy rain.

The NWS in Guam posted at 11 a.m. EDT (1500 UTC/1 a.m. CHST on Aug. 4 local time) the center of Tropical Storm Shanshan was located near Latitude 18.8 degrees north and Longitude 149.7 degrees east. That's about 260 miles east of Pagan and Agrihan and about 260 miles east-northeast of Alamagan.