Visible Satellite View of Storms over Western/Central Puerto Rico! (credit: NWS San Juan, Puerto Rico)
DISCUSSION: Earlier this afternoon a number of isolated thunderstorm clusters blossomed in and around the higher terrain of Western and Central Puerto Rico! The majority of this convection was triggered by differential diurnal heating (uneven daytime-heating) which helped to establish thermal boundaries across parts of the island. These thermal boundaries helped to establish a locally-unstable boundary layer (the layer of the atmosphere in which most surface-based convection develops) which supported the scattered thunderstorms across Western and Central Puerto Rico!
©2017 Meteorologist Jordan Rabinowitz