Weather Glossary



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Ablation Depletion of snow and ice by melting and evaporation. ...
Absorption The process in which incident radiant energy is retained by a substance by conversion to ...
Accretion The growth of a precipitation particle by the collision of a frozen particle with a ...
Adiabat A line on a thermodynamic chart relating the pressure and temperature of a substance (such ...
Adiabatic Changes in temperature caused by the expansion (cooling) or compression (warming) of a body of ...
Adiabatic Lapse Rate The rate of decrease of temperature experienced by a parcel of air when it is ...
Advection Transport of an atmospheric property by the wind. ...
Air Mass A body of air covering a relatively wide area and exhibiting horizontally uniform properties. ...
Air Mass Thunderstorm Generally, a thunderstorm not associated with a front or other type of synoptic-scale forcing mechanism. ...
Albedo Reflectivity; the fraction of radiation striking a surface that is reflected by that surface. ...
Alberta Clipper A fast moving low pressure system that moves southeast out of Canadian Province of Alberta ...
Aleutian Low A semi-permanent, subpolar area of low pressure located in the Gulf of Alaska near the ...
Altostratus A cloud of a class characterized by a generally uniform gray sheet or layer, lighter ...
Anemometer An instrument used for measuring the speed of the wind. ...
ANOMALOUS PROPAGATION Non-standard atmospheric temperature or moisture gradients will cause all or part of the radar beam ...
Anticyclone A large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in ...
Anvil The flat, spreading top of a cumulonimbus cloud, often shaped like an anvil. Thunderstorm anvils ...
Arctic Oscillation The Arctic Oscillation is a pattern in which atmospheric pressure at polar and middle latitudes ...
Arcus A low, horizontal cloud formation associated with the leading edge of thunderstorm outflow (i.e., the ...
Azores High Alternate term for Bermuda High - a semi-permanent, subtropical area of high pressure in the ...
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City Weather

Toronto
Sunny -2°C
Halifax
Mostly Clear 1°C
Quebec
Mostly Sunny -9°C
Ottawa
Mostly Sunny -7°C
Montreal
Mostly Sunny -7°C
Winnipeg
Snow -2°C
Calgary
Partly Cloudy 14°C
Yellowknife
Mostly Cloudy -7°C
Saskatoon
Mostly Sunny 7°C
Vancouver
Showers Nearby 12°C

Last Update: 6:00 PM Mar 22 2017