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Rear flank downdraft. The rear flank downdraft ( RFD) is a region of dry air wrapping around the back of a mesocyclone in a supercell thunderstorm. [1] These areas of descending air are thought to be essential in the production of many supercellular tornadoes. Large hail within the rear flank downdraft often shows up brightly as a hook on ...
The Oliver Hazard Perry class is a class of guided-missile frigates named after U.S. Commodore Oliver Hazard Perry, a commander noted for his role in the Battle of Lake Erie. Also known as the Perry or FFG-7 (commonly "fig seven") class, the warships were designed in the United States in the mid-1970s as general-purpose escort vessels ...
where is the Boltzmann constant, is the Planck constant, and is the speed of light in the medium, whether material or vacuum. The spectral radiance of a body, , describes the amount of energy it emits at different radiation frequencies. It is the power emitted per unit area of the body, per unit solid angle of emission, per unit frequency.
100–800 m adjustable iron sights. Sight radius: 378 mm (14.9 in) [8] The AK-47, officially known as the Avtomat Kalashnikova (Russian: Автомат Калашникова, lit. 'Kalashnikov's automatic [rifle]'; also known as the Kalashnikov or just AK ), is a gas-operated assault rifle that is chambered for the 7.62×39mm cartridge.
The rear flank downdraft of a supercell is a very complex and not yet fully understood feature. RFDs mainly occur within classic and HP supercells although RFDs have been observed within LP supercells. The RFD of a supercell is believed to play a large part in tornadogenesis by tightening existing rotation within the surface mesocyclone.
Flank (anatomy) Surface lines of the front of the thorax and abdomen. (Latus labeled as "lumbar".) The flank or latus is the side of the body between the rib cage and the iliac bone of the hip (below the rib cage and above the ilium). [1] It is sometimes called the lumbar region.
Tool wear. In machining, tool wear is the gradual failure of cutting tools due to regular operation. Tools affected include tipped tools, tool bits, and drill bits that are used with machine tools . Types of wear include: flank wear in which the portion of the tool in contact with the finished part erodes. Can be described using the Tool Life ...
Tornadogenesis. A sequence of images showing the birth of a supercellular tornado. First, the rain-free cloud base lowers as a rotating wall cloud. This lowering concentrates into a funnel cloud, which continues descending simultaneously as a circulation builds near the surface, kicking up dust and other debris.