![]() It can be from 1 km to more than 100 km in width. Sea-ice terminology meaning a large area of pack/drift ice that is longer than it is wide. As the range increases between the neap and spring tides, large sections of grounded ice break away and drift down river causing the floes.Ī scale numbered from 0 to 12 used to estimate the force of marine wind, based on the observed effects of the wind on sea state. It is composed of ice of different thicknesses formed under pressure during ebb tide, the entire mass freezes together and gradually increasing in size, with each successive tide. ![]() It defines large, thick, uneven and discoloured ice floes that form on the upstream side of shoals and islets in rivers, when cold weather precedes or accompanies neap tides. Sea-ice terminology that describes ice without snow cover.Ĭanadian sea-ice terminology that is not a part of the World Meteorological Organization’s (WMO) terminology. For example, from southwest to southeast, through south. These silent fireworks are often seen on clear winter nights in a variety of shapes and colours, and are referred to as the Northern Lights.Ī counter-clockwise change in wind direction. The luminous, radiant emission from the upper atmosphere that appears over middle and high latitudes, and is centered on the earth's magnetic poles. The internationally recognized unit for measuring atmospheric pressure is the kilopascal (kPa). The pressure exerted by the weight of air above a given point, sometimes expressed in millibars (mb) or inches of mercury (Hg). The atmosphere is divided into four sections: the troposphere reaches an altitude of about 10 km from the earth's surface the stratosphere which is at 10 km to 50 km from the earth’s surface the mesosphere which is at 50 km to 80 km from the earth’s surface and lastly the thermosphere which is anything beyond 80 km from the earth’s surface. The mass of air held close to the earth by gravity. Sea-ice terminology, that includes the terms: It is the opposite of perigee.Ī type of fog that forms when an outbreak of cold Arctic air settles over an expanse of open, relatively warmer water. The point in the moon’s orbit that is farthest from the Earth. ![]() Rotation of an air mass that is clockwise in the Northern Hemisphere and counter-clockwise in the Southern Hemisphere. It is generally associated with fair weather. Sea-ice terminology that describes submerged ice attached or anchored to the bottom of the sea, irrespective of the nature of its formation.Ī high pressure system with an anticyclonic circulation. Alerts are currently issued as special weather statements, advisories, watches and warnings. Alerts are issued by Environment and Climate Change Canada’s Meteorological Service (MSC) for weather or environmental hazard events that are either occurring, imminent, or forecast to develop. It may extend over an area of several million square kilometres and over a depth of several kilometres.Ī transmitted signal used to heighten awareness and/or initiate preparation for action. An area of brash ices that is not compacted.Īn extensive body of the atmosphere with comparable temperature and humidity. These ridges are like undulations or waves.Ĭanadian sea-ice terminology that is not part of the World Meteorological Organization’s (WMO) terminology. Sea-ice terminology that describes a ridge that has undergone considerable weathering. These acids form in the atmosphere when industrial gas emissions combine with water, and have negative impacts on the environment and human health.įog which forms when a relatively moist and warm air mass moves over a colder water or land surface.Ī type of alert from Environment and Climate Change Canada’s Meteorological Service (MSC), where a certain weather or environmental hazard (for example air quality and tsunami) is either occurring, imminent or is expected to occur. Reduction of the water equivalent of a snow cover by melting, evaporation, wind and avalanches.Ī generic term used for precipitation that contains an abnormally high concentration of sulphuric and nitric acid.
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