Environment Canada's Weatheroffice produces the official weather watches and warnings if the atmospheric conditions are conducive for the development of significant and/or severe weather. The Public Alerting Program has 4 types of alerts and it depends on the severity and timing of the event. A weather hazard has to reach specific criteria for an alert to be issued.
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Wunderground produces a Northeast American Systems Map showing the location of major low and high pressure surface systems.
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NA Systems Map
GOES NAM IR & Topography
Environment Canada produces a North American Composite satellite image from the Geostationary Operational Environmental Satellite that is updated hourly.