Aviation dictionary. 2014.
Positive vorticity advection — Positive vorticity advection, or PVA, is the result of higher values of vorticity advecting into lower values of vorticity. DevelopmentVorticity in the atmosphere is created in three different ways, which are named in their resultant vorticity.… … Wikipedia
Vorticity — is a mathematical concept used in fluid dynamics. It can be related to the amount of circulation or rotation (or more strictly, the local angular rate of rotation) in a fluid.Clancy, L.J., Aerodynamics , Section 7.11] The average vorticity zeta… … Wikipedia
vorticity — is a measure of rotation in the atmosphere, or “spin,” in the air. If the spin, as viewed from above, is counterclockwise in the Northern Hemisphere, it is called a vorticity cyclonic and given a positive value. If the spin is clockwise, it is… … Aviation dictionary
Vorticity equation — The vorticity equation is an important prognostic equation in the atmospheric sciences. Vorticity is a vector, therefore, there are three components. The equation of vorticity (three components in the canonical form) describes the total… … Wikipedia
Omega equation — The omega equation is of great importance in meteorology and atmospheric physics. It is a partial differential equation for the vertical velocity, ω, which is defined as a Lagrangian rate of change of pressure with time, that is, . The equation… … Wikipedia
Shortwave (meteorology) — A shortwave or shortwave trough is an embedded kink in the trough/ridge pattern. This is the opposite of longwaves, which are responsible for synoptic scale systems. Shortwaves are most frequently caused by either a cold pool or an upper level… … Wikipedia
Atmospheric convection — Conditions favorable for thunderstorm types and complexes Atmospheric convection is the result of a parcel environment instability, or temperature difference, layer in the atmosphere. Different lapse rates within dry and moist air lead to… … Wikipedia
1996 Lake Huron cyclone — Hurricane Huron The 1996 Lake Huron cyclone (commonly known as Hurricane Huron, or the Hurroncane) was a strong cyclonic storm system that developed over Lake Huron in September 1996. It had some characteristics of a tropical cyclone. Contents … Wikipedia
climate — /kluy mit/, n. 1. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. 2. a region or… … Universalium
Raychaudhuri equation — In general relativity, Raychaudhuri s equation is a fundamental result describing the motion of nearby bits of matter.The equation is important as a fundamental lemma for the Penrose Hawking singularity theorems and for the study of exact… … Wikipedia
