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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City Weather

Toronto
Light Rain 3°C
Halifax
Scattered Snow Showers -1°C
Quebec
Partly Cloudy -2°C
Ottawa
Mostly Cloudy -3°C
Montreal
Areas of Fog -4°C
Winnipeg
Partly Cloudy -2°C
Calgary
Partly Cloudy 5°C
Yellowknife
Mostly Clear N/A
Saskatoon
Cloudy 2°C
Vancouver
Light Rain 7°C

Last Update: 6:00 AM Mar 25 2017