Weather Glossary



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Saffir-Simpson Hurricane Wind Scale The Saffir-Simpson Hurricane Wind Scale is a 1 to 5 categorization based on the hurricane's ...
SBCAPE Surface Based CAPE; CAPE calculated using a Surface based parcel. ...
Scud Small, ragged, low cloud fragments that are unattached to a larger cloud base and often ...
Sea Level Pressure The sea level pressure is the atmospheric pressure at sea level at a given location. ...
Shear Variation in wind speed (speed shear) and/or direction (directional shear) over a short distance within ...
Shelf Cloud A low, horizontal wedge-shaped arcus cloud, associated with a thunderstorm gust front (or occasionally with ...
Shortwave Trough A disturbance in the mid or upper part of the atmosphere which induces upward motion ...
Showalter Index a stability index used to determine thunderstorm potential. The SWI is calculated by lifting an ...
Single Cell Thunderstorm This type of thunderstorm develops in weak vertical wind shear environments. On a hodograph, this ...
Sleet Sleet is defined as pellets of ice composed of frozen or mostly frozen raindrops or ...
SOI The Southern Oscillation Index (SOI) has been developed to monitor the Southern Oscillation using the ...
Sounding A set of data measuring the vertical structure of an atmospheric parameter (temperature, humidity, pressure, ...
Southern Oscillation a "see-saw" in surface pressure in the tropical Pacific characterized by simultaneously opposite sea level ...
Squall Line A line of active thunderstorms, either continuous or with breaks, including contiguous precipitation areas resulting ...
Stability Index The overall stability or instability of a sounding is sometimes conveniently expressed in the form ...
Stable Boundary Layer The stably-stratified layer that forms at the surface and grows upward, usually at night or ...
Steering Currents a prevailing synoptic scale flow which governs the movement of smaller features embedded within it. ...
Stratiform Having extensive horizontal development, as opposed to the more vertical development characteristic of convection. Stratiform ...
Stratocumulus Low-level clouds, existing in a relatively flat layer but having individual elements. Elements often are ...
Sublimation The transition of a substance from the solid phase directly to the vapor phase, or ...
Subtropical Cyclone A non-frontal low pressure system that has characteristics of both tropical and extratropical cyclones. This ...
Supercell potentially the most dangerous of the convective storm types. Storms possessing this structure have been ...
Surface-based Convection Convection occurring within a surface-based layer, i.e., a layer in which the lowest portion is ...
Synopsis A broad discussion of the weather pattern expected across any given area, generally confined to ...
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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