Mesoscale boundary separating outflow from the surrounding air
"Gust Front" redirects here. For the Legacy of the Aldenata military science fiction novel by John Ringo, see Gust Front (novel).
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 (outflow) 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. Outflow boundaries can persist for 24 hours or more after the thunderstorms that generated them dissipate, and can travel hundreds of kilometers from their area of origin. New thunderstorms often develop along outflow boundaries, especially near the point of intersection with another boundary (cold front, dry line, another outflow boundary, etc.). Outflow boundaries can be seen either as fine lines on weather radar imagery or else as arcs of low clouds on weather satellite imagery. From the ground, outflow boundaries can be co-located with the appearance of roll clouds and shelf clouds.[1]
Outflow boundaries create low-level wind shear which can be hazardous during aircraft takeoffs and landings. If a thunderstorm runs into an outflow boundary, the low-level wind shear from the boundary can cause thunderstorms to exhibit rotation at the base of the storm, at times causing tornadic activity. Strong versions of these features known as downbursts can be generated in environments of vertical wind shear and mid-level dry air. Microbursts have a diameter of influence less than 4 kilometres (2.5 mi), while macrobursts occur over a diameter greater than 4 kilometres (2.5 mi). Wet microbursts occur in atmospheres where the low levels are saturated, while dry microbursts occur in drier atmospheres from high-based thunderstorms. When an outflow boundary moves into a more stable low level environment, such as into a region of cooler air or over regions of cooler water temperatures out at sea, it can lead to the development of an undular bore.[2]
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An outflowboundary, also known as a gust front, is a storm-scale or mesoscale boundary separating thunderstorm-cooled air (outflow) from the surrounding...
Look up outflow in Wiktionary, the free dictionary. Outflow may refer to: Capital outflow, the capital leaving a particular economy Bipolar outflow, in astronomy...
the direction of movement of their associated storms, similar to an outflowboundary (gust front), except that the wind remains sustained for a greater...
virtually no vertical wind shear weaken as soon as they send out an outflowboundary in all directions, which then quickly cuts off its inflow of relatively...
outflow boundaries are depicted as troughs with a label of "OUTFLOWBOUNDARY" or "OUTFLOW BNDRY".[citation needed] Sea breeze fronts occur on sunny days...
dash labelled SQLN or squal line, while outflowboundaries are depicted as troughs with a label of outflowboundary. Fronts are the principal cause of significant...
three-dimensional boundary. The stronger the outflowboundary is, the stronger the resultant vertical wind shear will become. Weather fronts are boundaries between...
ongoing by the time of these outlooks, focused along and north of an outflowboundary from Midland into northeastern Texas. The environment south of these...
heat burst, is created by vertical currents on the backside of old outflowboundaries and squall lines where rainfall is lacking. Heat bursts generate significantly...
area of the atmosphere which is stable in the low levels after an outflowboundary or a cold front moves through. In hydraulics, an undular bore is a...
thunderstorm Dust devil Intertropical Convergence Zone Khamsin Mistral (wind) Outflowboundary Simoom Sirocco Haboob at the Encyclopædia Britannica Farquharson, J...
upper-troposphere. Near the surface, the MCC exhibits high pressure, with an outflowboundary, or mesoscale cold front, at its leading edge. This high pressure is...
condensation from the cool outflow of the storm that lifts warmer air in the ambient environment (at the outflowboundary). When present in a supercell...
Football Association (German: Österreichischer Fußball-Bund, ÖFB) Outflowboundary, in meteorology, the leading edge of precipitation-cooled air emanating...
boundary layer vorticity upward into a vertical axis and tightens it into a strong vortex. Landspouts can also occur due to interactions from outflow...
regions around other thunderstorms. They may also be visible as an outflowboundary hours or days after convection and can pinpoint areas of favored thunderstorm...
air masses diverge are called areas of frontolysis. Frontogenesis Outflowboundary Thralls, Zoe A. (1958). The Teaching of Geography. Appleton-Century-Crofts...
the south of a quasi-stationary weather front, leaving a distinct outflowboundary across central and eastern Kansas. Early on March 13, morning atmospheric...
resulting in convective clouds. Surface weather analysis Weather front Outflowboundary Scott Girhard (2007-05-04). "Lecture 3 - Thunderstorms". San Antonio...
Convergence Zone (ITCZ), a tropical wave, a broad surface front, or an outflowboundary, a low level feature with sufficient vorticity and convergence is required...
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