the tilt of Earth’s axis relative to a line perpendicular to Earth’s orbital plane (the "surface" along which the planet orbits the sun). It is not a fixed quantity. The present value is from 23°2’ to 24°27’.
obscured; see Obscuration
the term used when the sky is completely hidden by surface-based obscuring phenomena
the lifting of air caused by its passage up and over mountains or other sloping terrain
the repeated variation of some measure around a central value. A swinging pendulum is an example of oscillation. In meteorology, an oscillation is a shift in position of high and low pressure systems. One example is the AO (Arctic Oscillation).
a polar orbiting satellite (POES)-derived measurement of the radiative character of energy radiated from the warmer earth surface to cooler space. This measurement gives information on cloud-top temperature, which can be used to estimate tropical precipitation amounts (which is important in forecasting weather and climate).
a radar term indicating a region of high reflectivity at middle and upper levels above an area of weak reflectivity at low levels. The overhang is found on the inflow side of a thunderstorm (normally the south or southeast side).
a dome-like protrusion above a thunderstorm anvil; it represents a very strong updraft and, hence, a higher potential for severe weather with that storm. A persistent and/or large overshooting top often is present on a supercell.
a triatomic form of oxygen that is a nearly colorless gas of pungent odor; it is formed naturally in the upper atmosphere, generally between the heights of about 10 and 50 km and it results in the absorption of a large part of the sun’s most intense incoming radiation
a severe depletion of stratospheric ozone over Antarctica that occurs each spring. The depletion is caused by a chemical reaction involving ozone and chlorine, primarily from human produced sources, cloud particles, and low temperatures.