As tropical storm Nat moves away from the Samoan Islands and towards Tahiti, another Invest area, 98P, has developed north of the Samoan Islands. The animation above, from the MIMIC Total Precipitable Water site (link), shows a cyclonically-rotating concentration of moisture just north of Samoa, and moving east-southeastward toward Olosega... Read More
GOES-16 (GOES-East) “Clean” Infrared Window (10.3 µm) images that included an overlay of GLM Flash Extent Density (above) revealed intermittent clusters of lightning activity across parts of north-central Illinois — many of which occurred in the general vicinity of METAR sites that were reporting moderate to heavy snow — during the hours prior to... Read More
Blizzard warning were hoisted over the high plains of Kansas, Nebraska, New Mexico, Texas and Oklahoma for a strong storm on 8 January 2024 (image from the weather.gov website). The animation above shows visible imagery overlain with LightningCast probabilities centered over Kansas. Convection occurring over the cold aid will lead... Read More
Night Microphysics RGB imagery from the CSPP Geosphere site (link to a very similar animation to the one above) shows a line of tropical cumulus approaching Samoa. There are subtle color changes in that RGB that typically presage convective development (as also shown in this blog post, for example), and as highlighted in the annotated animation below that covers 0830-1230 UTC. The... Read More
