GOES-12 6.5 µm water vapor channel imagery (QuickTime animation, above) revealed a series of vortices migrating southward along the western periphery of the large cold-core polar vortex that was centered over southern Ontario on 13 September. Instability-like fragmentation of a Read More
A deep cold core upper-level low rapidly intensified over the northcentral US and southcentral Canada on 11 October — cold air in the wake of a strong southward-moving cold frontal boundary allowed many sites across the Upper Midwest and the western Great... Read More
1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.3 µm) images (above) showed an isolated thunderstorm which produced an EF-1 tornado in northeastern Ohio and 1.0-inch diameter hail in northwestern Pennsylvania during the morning hours on 08 January 2019 (SPC storm reports). (09 January update: a storm survey conducted by NWS Pittsburgh also confirmed... Read More
A neat circulation feature appeared this morning northwest of Fargo. #ndwx #mnwx pic.twitter.com/AhLRsVSTZQ — NWS Grand Forks (@NWSGrandForks) November 6, 2018 One interesting aspect of this 06 November 2018 mesoscale vortex (which was embedded within a stratus cloud deck) was the fact that a signature of the feature was evident in imagery from... Read More
