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A hook echo is a pendant or hook-shaped weather radar signature as part of some supercell thunderstorms. It is found in the lower portions of a storm as air and precipitation flow into a mesocyclone, resulting in a curved feature of reflectivity. The echo is produced by rain, hail, or debris being wrapped around the supercell. [1]
A mesocyclone is a meso-gamma mesoscale (or storm scale) region of rotation , typically around 2 to 6 mi (3.2 to 9.7 km) in diameter, most often noticed on radar within thunderstorms. In the Northern Hemisphere , it is usually located in the right rear flank (back edge with respect to direction of movement) of a supercell , or often on the ...
Supercell thunderstorms occur more frequently in tornado alley and Dixie Alley than anywhere else in the world. Tornado watches and warnings are frequently necessary in the spring and summer. Most places from the Great Plains to the East Coast of the United States and north as far as the Canadian Prairies , the Great Lakes region , and the St ...
Local Radar Image. What is a supercell? A supercell is a large thunderstorm that has a deep and persistent rotating updraft. It looks like a very tall storm cloud that has an anvil or elongated ...
Around 100 properties were damaged by what police called a ‘localised tornado’ that whipped through Stalybridge, Tameside, on Wednesday.
English: NEXRAD Reflectivity radar of the Quad-State Supercell from KPAH. This is the 2021 Western Kentucky tornado (seen via the hook echo) prior to impacting the city of Mayfield, Kentucky with winds estimated to be at least 188 miles per hour (303 km/h).
The near 26 inches of rain at Fort Lauderdale-Hollywood International Airport was a 1-in-1,000-year storm.
The rear flank downdraft can arise owing to negative buoyancy, which can be generated by cold anomalies produced at the rear of the supercell thunderstorm by evaporative cooling of precipitation or hail melting, or injection of dry and cooler air in the cloud, and by vertical perturbation pressure gradients that can arise from vertical gradients of vertical vorticity, stagnation of ...