Weather Glossary



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Radar Reflectivity The sum of all backscattering cross-sections (e.g., precipitation particles) in a pulse resolution volume divided ...
Radiation Inversion Used interchangably with Nocturnal Inversion; a temperature inversion that develops during the night as a ...
Radiosonde An instrument that is carried aloft by a balloon to send back information on atmospheric ...
Rawinsonde A radiosonde that is tracked to measure winds. ...
Relative Vorticity The sum of the rotation of an air parcel about the axis of the pressure ...
Ridge An elongated area of relatively high atmospheric pressure; the opposite of trough. ...
Roll Cloud A low, horizontal tube-shaped arcus cloud associated with a thunderstorm gust front (or sometimes with ...
Rossby Waves A series of troughs and ridges on quasi-horizontal surfaces in the major belt of upper ...
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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