Due to a lack of radar coverage over American Samoa, WSO Pago Pago requested 1-minute Mesoscale Domain Sector coverage over the islands to monitor convective development and the potential for flash flooding. GOES-18 (GOES-West) Clean Infrared Window (10.3 µm) images (above) showed showers and thunderstorms that developed in the general vicinity of the... Read More

GOES-18 imagery/products, shown below, depict an area of enhanced instability and moisture centered on American Samoa, and convection develops and persists over/around the main island of American Samoa, Tutuila. The convection appears to form along an east-west line that drifts over the island between 0400 and 0800 UTC.Total Precipitable Water... Read More

1-minute Mesoscale Domain Sector GOES-19 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.3 µm) images (above) showed thunderstorms that produced giant hail (as large as 5.00 inches in diameter) and damaging wind gusts (as high as 106 mph) across the Texas Panhandle and North Texas (SPC Storm Reports) on 29 April 2025. The Infrared images revealed pulses of... Read More

Due to a lack of radar coverage over American Samoa, WSO Pago Pago requested 1-minute Mesoscale Domain Sector coverage over the islands during a period of heavy rainfall risk. GOES-18 (GOES-West) Clean Infrared Window (10.3 µm) images (above) displayed showers and thunderstorms that moved across the American Samoa island of Tutuila (where Pago Pago... Read More