During a period when American Samoa had been under a prolonged Flood Watch, the Weather Service Office at Pago Pago requested that a GOES-18 (GOES-West) Mesoscale Domain Sector be positioned over the region (due to their lack of radar). 1-minute Infrared imagery with GLM Flash Points (above) displayed deep convection with intermittent lightning activity... Read More
1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Visible, Water Vapor and Infrared images (above) showed the development of vertically-propagating standing wave clouds over far northeastern South Dakota on 28 March 2026 — initiated by strong SW winds interacting with the topography of the Coteau des Prairies.The coldest cloud-top infrared brightness temperatures of the standing wave cloud... Read More
During the day of 27 March 2026, a band of strong strorms propagated from north of the Samoan islands southward to the island themselves. These storm were notable for deep convection and strong environmental instability and were the cause of flood warnings across American Samoa. A good first look at... Read More
2.5-minute Target Sector JMA Himawari-9 AHI Infrared images (above) showed Cyclone Narelle after it had rapidly intensified to a 115 kt Category 4 storm (JTWC discussion | ADT | SATCON) off the coast of Western Australia on 26 March 2026. As Narelle moved southwestward toward the Exmouth Peninsula, it weakened slightly... Read More
