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A tornadic debris signature (TDS), often colloquially referred to as a debris ball, [1] is an area of high reflectivity on weather radar caused by debris lofting into the air, usually associated with a tornado. [1] [2] A TDS may also be indicated by dual-polarization radar products, designated as a polarimetric tornado debris signature (PTDS).
A Weather Service radar detected a tornado debris signature in a storm moving east of Marianna and into Jackson County around 7:30 a.m. Tornado warning issue for Chipley 8:42 a.m.:
The multiple reflections of the radar beam causing the hail spike. Generally known as hail spikes, these are the result of energy from the radar hitting hail, very heavy rain, or in extreme cases, debris being lofted by a tornado, and being reflected to the ground, where they reflect back to the hail and then to the radar as in the image on the left. [1]
The basic mechanism of debris fallout is debris lofted by a tornado's updraft winds high into the atmosphere. [4] Charles E. Anderson completed the first study focusing on debris fallout on the F5 1984 Barneveld tornado, which produced a large survey revealing a trail of paper debris as wide as 23 mi (37 km) at 110 mi (180 km) from Barneveld and a roughly 85 mi (137 km) long path of heavy ...
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 ...
Dual-polarized WSR-88D radar image of the 2021 Naperville–Woodridge tornado, showing four products used to detect active tornadoes: high reflectivity returns in dBZ and low correlation coefficient returns, when paired with low differential reflectivity returns, indicate a tornado debris signature, and the strong opposing velocity values form ...
A mobile home was also rolled in this area. At that time, violent rotation of radar paired with a debris signature prompted the issuance of a tornado emergency by the National Weather Service in Jackson, Mississippi at 8:04 pm CDT; the tornado would remain under this tag for most of its existence.
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]