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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).
Nonmeteorological reflectors co-located with a couplet, can confirm that a tornado has likely occurred and lofted debris. An area of high reflectivity, or debris ball, may also be visible on the end of the hook. Either the polarimetric data or debris ball are formally known as the tornado debris signature (TDS).
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 ...
Radar reflectivity and velocity images of the supercell that produced the tornado at 5:12 p.m. CDT (22:12 UTC) as it struck Tuscaloosa, with a debris ball clearly visible. The supercell produced a large wedge tornado in rural Greene County, Alabama , which tracked towards the adjacent Tuscaloosa County at EF2 intensity, uprooting numerous trees ...
The town was hit particularly hard by the large tornado that leveled homes and businesses, leaving people trapped in ... there was a clear debris ball that showed up on the correlation coefficient ...
Tornado Debris Project (TDP) Tornado debris signature (TDS) – A more formal term for a debris ball. Tornado emergency – Enhanced wording used by the U.S. National Weather Service in a tornado warning or severe weather statement when a large, intense tornado is expected to impact a highly populated area (traverse a large city or dense suburbs).
Workers cleaned up tree limbs and other storm debris in Pelham, Alabama – about 20 miles south of Birmingham – on March 26, a day after a tornado damaged homes, trees, and power lines in the ...
Polk County is sending public works crews to pick up vegetation and tree debris from last week's tornadoes and storms, including in Pleasant Hill.