CIMSS Satellite Blog

GOES-16 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images [click to play animation | MP4]

1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (above) showed Potential Tropical Cyclone Nine as it moved northeastward across the Caribbean Sea on 29 July 2020. In Puerto Rico, Luis Muñoz Marin Airport in San Juan (TJSJ) had a wind gust to 44 knots (51 mph) around 19 UTC. Numerous pulsing overshooting tops were seen, with some exhibiting cloud-top infrared brightness temperatures as cold as -89ºC — according to plots of rawinsonde data from San Juan, Puerto Rico (below), such temperatures were about 10ºC colder than that of the tropopause. Note the significant increase in moisture from the 12 UTC to the 00 UTC soundings, as PTC9 moved closer to Puerto Rico.

Plots of rawinsonde data from San Juan, Puerto Rico [click to enlarge]

GOES-16 Infrared images with an overlay of GLM Flash Extent Density (below) revealed a modest amount of lightning activity associated with some of the larger clusters of convection.

GOES-16 “Clean” Infrared Window (10.35 µm) images, with an overlay of GLM Flash Extent Density [click to play animation | MP4]

from CIMSS Satellite Blog https://cimss.ssec.wisc.edu/satellite-blog/archives/37794