Although the east coast is the area of Canada most frequented by hurricanes, these storms still average less than one per year over the Atlantic Provinces and coastal waters. While there have been as many as five in one year, several years can pass with no tropical storms. The large concentric lines on television or newspaper weather maps are isobars. In Canada, the jet stream travels mostly from west to east and may extend over hundreds of kilometres. It has an altitude of about 9,000 metres.
Pilots flying at high altitudes often search out the jet stream to speed along eastbound flights.
The internationally recognized unit used by the Atmospheric Environment Service for measuring atmospheric pressure. Generally, any and all of the various forms of visible electrical discharge produced by thunderstorms . An area of low atmospheric pressure that has a closed counter-clockwise circulation in the Northern Hemisphere. Also known as a cyclone . Gale Warning - issued if winds are forecast to be in the range of 34 to 47 knots inclusive.