The animation above shows the Nighttime Microphysics RGB (saved from the CSPP Geosphere site) over the islands of American Samoa. (An animated gif is available here). The annotated animation below highlights several features that are typical of convective development detection at night. Low clouds become apparent shortly before 1450 UTC (when they are circled); subsequent color changes in... Read More
On 14 November 2022, American Samoa (indeed, all the Samoan Islands) were withing deep moisture associated with the South Pacific Convergence Zone, a common occurrence. The animation of MIMIC Total Precipitable Water, above, shows the evolution of the moisture hourly from 0000 to 1200 UTC on 14 November. (MIMIC fields... Read More
A toggle between NOAA-20 VIIRS Day/Night Band (0.7 µm) and Infrared Window (11.45 µm) images valid at 0805 UTC or 2:05 AM CST on 12 November 2022 (above) showed a broad plume of lake effect clouds streaming south-southwestward from Lake Nipigon, Ontario (north of Katatota Island, station CWKK) toward Lake Superior. A strong... Read More
RADARSAT-2 overflew Guam early on 10 November 2022, and the toggle above shows both Himawari-8 imagery at that time with the SAR wind estimates overlain. This was a time of light winds and minimal shower activity. It’s interesting that the wake of weak winds downwind of the islands of Guam... Read More
