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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 Doppler on Wheels radar loop of a hook echo and associated mesocyclone in Goshen County, Wyoming on June 5, 2009.Strong mesocyclones show up as adjacent areas of yellow and blue (on other radars, bright red and bright green), and usually indicate an imminent or occurring tornado.
"The radar scan at 5:52am clearly shows a "hook echo" offshore — that's the signature we look for to identify a developing tornado. This feature was embedded within a broad area of very heavy ...
The rear inflow notch (or weak echo channel) occurs to the east or north of a mesocyclone and hook echo. Forward inflow notches also occur, particularly on high-precipitation supercells (HP) and quasi-linear convective systems (QLCS). In the United States and a few other countries, Doppler capable weather radar
When the rain starts to fall, people immediately look to the weather radar to see how long it will last. But when severe weather strikes, meteorologists can use this technology to pinpoint the ...
Strong mesocyclone on a thunderstorm near Tuscaloosa, Alabama, that was analyzed as fitting the characteristics of a TVS.It was associated with a tornado.. A tornadic vortex signature, abbreviated TVS, is a Pulse-Doppler radar weather radar detected rotation algorithm that indicates the likely presence of a strong mesocyclone that is in some stage of tornadogenesis. [1]
As it neared Waco, operators of weather radar at Texas A&M University detected a hook echo in association with the parent supercell. This was one of the first times that radar linked tornadogenesis with hook-echo signatures. [7] However, because heavy rain obscured the tornado, it was largely invisible to people in its path.
The hook echo and associated mesocyclone of the tornado. On the afternoon of June 5, a large tornado was observed by researchers with the VORTEX 2 tornado research project in Goshen County, Wyoming, with the entire life cycle of the tornado being broadcast live on The Weather Channel as part of their coverage of the VORTEX2 project. [1]