AURORA – It is created by the radiant energy emission from the sun and its interaction with the earth’s upper atmosphere over the middle and high latitudes. It is seen as a bright display of constantly changing light near the magnetic poles of each hemisphere. In the Northern Hemisphere, it is known as the aurora borealis or Northern Lights, and in the Southern Hemisphere, this phenomena is called the aurora australis.
Absolute Humidity– The density of water vapor. It is the mass of the water vapor
divided by the volume that it occupies.
BWER – Bounded Weak Echo Region. (Also known as a vault.) Radar signature within
a thunderstorm characterized by a local minimum in radar reflectivity at low levels which
extends upward into, and is surrounded by, higher reflectivities aloft. This feature is
associated with a strong updraft and is almost always found in the inflow region of a
thunderstorm. It cannot be seen visually.
Celsius– a temperature scale in which zero is the freezing point of water and one
hundred is the boiling point.
El Niño – A major warming of the equatorial waters in the eastern Pacific Ocean. El Niño events usually occur every 3 to 7 years, and are related to shifts in global weather patterns. (Spanish for the “Christ Child”, named this because it often begins around Christmas.)
Ivan-A catogary 3 hurricane which struck Grenada on Sept 7 2004