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The National Weather Service included screen shots from that video on its Grand Rapids Facebook page expl. An unusual weather phenomenon called a “gustnado,” which looks like a small tornado ...
A gustnado is a brief, shallow surface-based vortex which forms within the downburst emanating from a thunderstorm. [2] The name is a portmanteau by elision of " gust front tornado ", as gustnadoes form due to non-tornadic straight-line wind features in the downdraft ( outflow ), specifically within the gust front of strong thunderstorms.
A tornado was reported on the south side of Hobart, although it was later determined to be a gustnado instead. [5] As the night progressed, a squall line developed in Western Texas and steadily organized as it moved eastward overnight producing more severe weather. [6] The main day of the outbreak was March 17.
Area of occurrence: North America (particularly in central and southeastern regions of the United States colloquially known as Tornado Alley), South Africa, much of Europe (except most of the Alps), western and eastern Australia, New Zealand, Bangladesh and adjacent eastern India, Japan, the Philippines, and southeastern South America (Uruguay and Argentina)
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Outflow boundary on radar with radial velocity and frontal boundary drawn in.. An outflow boundary, also known as a gust front, is a storm-scale or mesoscale boundary separating thunderstorm-cooled air from the surrounding air; similar in effect to a cold front, with passage marked by a wind shift and usually a drop in temperature and a related pressure jump.
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.
Landspout is a term created by atmospheric scientist Howard B. Bluestein in 1985 for a tornado not associated with a mesocyclone. [3] The Glossary of Meteorology defines a landspout: