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
A QuickTime animation of GOES-12 imager 6.5 micrometer (“water vapor channel”) imagery (above) reveals an interesting vortex associated with a cutoff upper-level low which was migrating eastward from Illinois to Ohio on 13 Sepember. Several pulses of convection can be seen developing along the periphery... Read More
Severe convection developed in eastern portions of the Texas panhandle region, which produced wind gusts to 67 mph and golf-ball size hail (1.75 inch diameter) around 20:20 to 20:30 UTC (3:20 to 3:30 PM local time) in parts of Cottle county, TX (the county outlined... Read More
