A severe hail-producing thunderstorm moved over northeast Nebraska before noon on 22 September (SPC Storm Reports). The region hit was just south of a Marginal Risk of Severe Weather (The update at 1630 UTC included the region of severe weather). The GOES-13 visible animation, above, shows the initial development occurring along a subtle cloud line aligned mostly east-west.The NOAA/CIMSS ProbSevere model produces... Read More
Tropical Depression Nine in the Atlantic Ocean, above, shows characteristics of a heavily sheared storm (longer sunrise-to-sunset animations: gif | mp4). The low-level circulation is displaced south and west of the strongest convection (which is vigorous enough to produce occasional overshooting tops, below, as shown on this page).Metop-B overflew Tropical Depression Nine’s... Read More
The YouTube video embedded above shows GOES-13 Water Vapor (6.5 µm) images each hour for all of August 2015. The 10.7 µm Infrared window channel animation is shown below. Both show a remarkable lack of thunderstorm activity in the Caribbean Sea. In addition, hourly Water Vapor (6.5 µm) and... Read More
August 28 2015 is the 10-year anniversary of Hurricane Katrina achieving Category 5 status (on the Saffir-Simpson Scale) in the central Gulf of Mexico. The mp4 animation above (available here as a 490 megabyte animated gif, and on YouTube) shows the evolution of Katrina from a thunderstorm cluster in the Bahamas... Read More
