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When severe weather looms, storm alerts are important tools for keeping people informed. The National Weather Service shares alerts as it warns of potential risks from thunderstorms, flooding ...
A shelf cloud along the leading edge of a derecho in Minnesota Damage caused by a derecho in Barga, Italy. A derecho (/ ˈ d ɛ r ə tʃ oʊ /, from Spanish: derecho [deˈɾetʃo], 'straight') [1] is a widespread, long-lived, straight-line wind storm that is associated with a fast-moving group of severe thunderstorms known as a mesoscale ...
In the government's three-tier warning system, red warnings are the highest category of warning that can be issued for the country, specifically used for dangerous and severe weather phenomena.
See Severe weather terminology (United States) and/or Severe weather terminology (Canada) for comprehensive articles concerning specific nations' warnings, watches, advisories and related terms. Pages in category "Weather warnings and advisories"
A weather warning generally refers to an alert issued by a meteorological agency to warn citizens of approaching dangerous weather.A weather watch, on the other hand, typically refers to an alert issued to indicate that conditions are favorable for the development of dangerous weather patterns, although the dangerous weather conditions themselves are not currently present.
However, as weather systems continue to move along from west to east across the nation, there will still be episodes of thunderstorms, including large complexes of damaging and dangerous severe ...
In Canada, a severe thunderstorm is defined as having wind gusts of greater than 90 km/h (56 mph), hail with a diameter of greater than two centimetres (0.79 in), rainfall rates of greater than 50 millimetres (2.0 in) in one hour or greater than 75 millimetres (3.0 in) in three hours, or tornadoes. [14]
The official scientific criteria of a derecho, as described by the National Weather Service's Storm Prediction Center, pertains to a swath of wind damage that must extend either continuously or ...