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Shortwave (meteorology)
 
 
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A shortwave or shortwave trough is an embedded kink in the trough
Trough

Trough may refer to:* Trough , a container for animal feed * Trough , a long depression less steep than a trench* Trough , an elongated region of low atmospheric pressure...
 / ridge
Ridge

A ridge is a geological feature that features a continuous elevational crest for some distance. Ridges are usually termed hills or mountains as well, depending on size....
 pattern. This is the opposite of longwave
Longwave

The longwave radio band is a range of frequencies used for AM broadcasting, which extends from 148.5 to 283.5 kHz. It falls within the low frequency part of the radio spectrum ....
s, which are responsible for synoptic scale
Synoptic scale meteorology

The synoptic scale in meteorology is a horizontal length scale of the order of 1000 kilometres or more . This corresponds to a horizontal scale typical of mid-latitude Depression ....
 systems, although shortwaves may be contained within or found ahead of longwaves and range from the mesocale
Mesoscale meteorology

Mesoscale Meteorology is the study of weather systems smaller than synoptic scale systems but larger than Microscale meteorology and storm-scale cumulus systems....
 to the the synoptic scale. Shortwaves are most frequently caused by either a cold pool or an upper level front
Weather front

A weather front is a boundary separating two air mass of different density, and is the principal cause of meteorological phenomenon. In surface weather analysis, fronts are depicted using various colored lines and symbols, depending on the type of front....
.

twaves are often associated with warm (WAA) or cold air advection
Advection

Advection, in mechanical and chemical engineering, is a transport mechanism of a substance or a conserved property with a moving fluid. The fluid motion in advection is described mathematically as a vector field, and the material transported is typically described as a scalar concentration of substance, which is contained in the fluid....
 (CAA), which influence temperature.






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Encyclopedia


A shortwave or shortwave trough is an embedded kink in the trough
Trough

Trough may refer to:* Trough , a container for animal feed * Trough , a long depression less steep than a trench* Trough , an elongated region of low atmospheric pressure...
 / ridge
Ridge

A ridge is a geological feature that features a continuous elevational crest for some distance. Ridges are usually termed hills or mountains as well, depending on size....
 pattern. This is the opposite of longwave
Longwave

The longwave radio band is a range of frequencies used for AM broadcasting, which extends from 148.5 to 283.5 kHz. It falls within the low frequency part of the radio spectrum ....
s, which are responsible for synoptic scale
Synoptic scale meteorology

The synoptic scale in meteorology is a horizontal length scale of the order of 1000 kilometres or more . This corresponds to a horizontal scale typical of mid-latitude Depression ....
 systems, although shortwaves may be contained within or found ahead of longwaves and range from the mesocale
Mesoscale meteorology

Mesoscale Meteorology is the study of weather systems smaller than synoptic scale systems but larger than Microscale meteorology and storm-scale cumulus systems....
 to the the synoptic scale. Shortwaves are most frequently caused by either a cold pool or an upper level front
Weather front

A weather front is a boundary separating two air mass of different density, and is the principal cause of meteorological phenomenon. In surface weather analysis, fronts are depicted using various colored lines and symbols, depending on the type of front....
.

Corresponding weather and effects

Shortwaves are often associated with warm (WAA) or cold air advection
Advection

Advection, in mechanical and chemical engineering, is a transport mechanism of a substance or a conserved property with a moving fluid. The fluid motion in advection is described mathematically as a vector field, and the material transported is typically described as a scalar concentration of substance, which is contained in the fluid....
 (CAA), which influence temperature. Due to the way they curve the air that moves around them and the way air moves away from them, shortwaves produce positive curvature vorticity
Vorticity

Vorticity is a mathematical concept used in fluid dynamics. It can be related to the amount of "Circulation " or "rotation" in a fluid.The average vorticity in a small region of fluid flow is equal to the Circulation around the boundary of the small region, divided by the area A of the small region....
 and positive shear vorticity, respectively. Ahead of a shortwave there is large-scale lift due to divergence from positive vorticity advection
Positive vorticity advection

Positive vorticity advection, or PVA, is the result of more cyclonic values of vorticity advecting into lower values of vorticity. It is more generally referred to as "Cyclonic Vorticity Advection" ....
 (PVA). This lift often sparks precipitation
Precipitation (meteorology)

File:MeanMonthlyP.gifIn meteorology, precipitation is any product of the condensation of Atmosphere water vapor that is deposited on the earth's surface....
. In a capped environment
Convective inhibition

Convective inhibition is a numerical measure in meteorology that indicates the amount of energy that will prevent an air parcel from rising from the surface to the level of free convection....
, the lift generated by a shortwave may cool the inversion layer through adiabatic cooling, allowing for deep, moist convection
Atmospheric convection

Atmospheric convection is the result of a Air parcel-environment instability, or temperature difference, layer in the atmosphere. It is often responsible for adverse weather throughout the world....
.

External links

  • . Haby's Hints.
  • . NWS
    National Weather Service

    The National Weather Service , once known as the Weather Bureau, is one of the six scientific agencies that make up the National Oceanic and Atmospheric Administration of the United States Federal government of the United States....
     Glossary.