![]() ![]() ![]() ![]() Deflects winds to the right (with wind at your back) in the northern hemisphere.Ĭritical Fire Weather Pattern: Patterns that can quickly increase fire danger and trigger rapid fire spread.Ĭumulus: A principal cloud type in the form of individual detached elements, sharp non-fibrous outlines, and vertical development.Ĭumulonimbus: The ultimate growth of a cumulus cloud into a mushroom shape, with considerable vertical growth, usually fibrous ice crystal tops, and probably accompanied by lightning, thunder, hail and strong winds.Ĭut off Low: A cold low which has become displaced to south, out of the basic westerly flow.Ĭyclonic: Having a sense of counter-clockwise rotation about the local vertical.Ĭyclone: A closed isobaric circulation in the atmosphere, with counter-clockwise rotation in the northern hemisphere.ĭeepening: A decrease in the central pressure of a cyclonic, or low pressure system.ĭew Point: The temperature to which a parcel of air must be cooled to reach saturation.ĭiffuse front: A front across which the wind shift and temperature change are weakly defined.ĭivergence: Downward (subsidence) motion results. Associated with low pressure systems.Ĭoriolis Force: The deflecting influence of the earth's rotation on winds. If at the surface, vertical motion results. usually means upward as opposed to subsidence (downward).Ĭonvergence: Net horizontal inflow of air into a layer. usually several decades).Ĭloud: The visible aggregate of minute water droplets and/or ice particles in the atmosphere above the earths's surface.Ĭold Front: The leading edge of a relatively cold air mass.Ĭomplex: An area of low pressure within which more than one center is found.Ĭondensation: The physical process by which a vapor becomes a liquid.Ĭonduction: The transfer of energy within and through a conductor by means of molecular activity.Ĭontour: In meteorology, a line of constant height on a constant pressure surface map.Ĭonvection: In meteorology, atmospheric motions that are predominantly vertical, i.e. from west to south.īlocking: Obstruction, on a large scale, of the normal west to east movement of highs and lows.Ĭalm: Absence of apparent motion of the air.Ĭlimate: The statistical collective of weather conditions over a specified period of time (i.e. It is measured by the barometer, and expressed in millibars or inches of mercury.īacking: A change of wind direction in a counter-clockwise direction (the opposite of veering) i.e. (clockwise flow in the northern hemisphere).Ītmospheric Pressure: The pressure exerted by the air as a result of gravity. compression results in warming, expansion in cooling).Īdiabatic Chart: A thermodynamic diagram with temperature as abscissa and pressure as ordinate.Īdvection: Transport of an atmospheric property solely by the mass motion of the atmosphere.Īir Mass: A homogenous mass of air, the properties of which can be identified as having been established while the air was situated over a particular region of the earth's surface.Īnabatic Wind: An upslope wind usually applied only when the wind is blowing up hill or mountain as the result of local surface heating, and apart from the effects of the larger scale circulation.Īnemometer: Instrument designed to measure the speed of the wind.Īnticyclone: A closed circulation of the atmosphere, of relative high pressure. Adiabatic (process) : A thermodynamic change of state of a system in which there is no transfer of heat or mass (i.e. ![]()
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