Weather Glossary



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Macroburst A convective downdraft with an affected outflow area of at least 2½ miles wide and ...
Madden-Julian Oscillation (MJO) Tropical rainfall exhibits strong variability on time scales shorter than the seasonal El Niño-Southern Oscillation ...
Mammatus Clouds Rounded, smooth, sack-like protrusions hanging from the underside of a cloud (usually a thunderstorm anvil). ...
Marine Inversion Temperature inversion produced when cold marine air underlies warmer air. ...
Mean Layer CAPE Mean Layer CAPE - CAPE calculated using a parcel consisting of Mean Layer values of ...
Medium Range Forecasting In forecasting, (generally) three to seven days in advance. ...
Meridional Flow Large-scale atmospheric flow in which the north-south component (i.e., longitudinal, or along a meridian) is ...
Mesocyclone A storm-scale region of rotation, typically around 2-6 miles in diameter and often found in ...
Mesolow A mesoscale low-pressure center. Severe weather potential often increases in the area near and just ...
Mesoscale Size scale referring to weather systems smaller than synoptic-scale systems but larger than storm-scale systems. ...
Mesoscale Convective Complex (MCC) Mesoscale Convective Complex. A large MCS, generally round or oval-shaped, which normally reaches peak intensity ...
Mesoscale Convective System (MCS) Mesoscale Convective System. A complex of thunderstorms which becomes organized on a scale larger than ...
METAR An international code (Aviation Routine Weather Report) used for reporting, recording and transmitting weather observations. ...
Meteogram A graphical depiction of trends in meteorological variables such as temperature, dew point, wind speed ...
Microburst A convective downdraft with an affected outflow area of less than 2½ miles wide and ...
Millibar A unit of atmospheric pressure equal to 1/1000 bar, or 1000 dynes per square centimeter. ...
Mixing Ratio The ratio of the weight of water vapor in a specified volume (such as an ...
Moist Adiabatic Lapse Rate The rate at which the temperature of a parcel of saturated air decreases as the ...
Multicell Thunderstorm These thunderstorms are organized in clusters of at least 2-4 short-lived cells. Each cell generates ...
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Weather can be active anytime when you make your visit to Canada. With each season offering its own unique conditions to observe. Booking coach or business class flights it is always a great time to visit Canada and its vast display of weather.