Heavy rains developed overnight over American Samoa, as depicted by the animation above from the CSPP Geosphere site. Low clouds — white/cyan in the RGB — start to show vertical development (that is, they get more and more red) shortly after 1000 UTC with more vigorous vertical growth apparent after 1100 UTC.... Read More
Night Microphysics RGB imagery over the Samoan Islands, above, saved from the CSPP Geosphere site, shows the characteristic color changes in the Night Microphysics RGB imagery from pink/salmon to dark red as lines of cumulus grow to thunderstorms. GREMLIN fields from the CIRA Slider, below, show the satellite-estimated MRMS fields. Rain starts... 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
Himawari-9 clean window (Band 13, 10.4 µm) infrared imagery, below, (created using geo2grid software and HSD files from the SSEC Data Center) shows strong convection developing in the Philippine Sea between the Philippines to the southwest, the Ryuku Islands to the west, Japan to the north, and Guam far to the east. The... Read More
