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First Warning is a severe weather warning system designed for broadcast television stations, typically those in the United States. A weather advisory product based on First Warning, called First Alert, is an automated version of this product, which has come into widespread use by television stations and is marketed under different names depending on the graphics service vendor.
References to the "significant weather advisory" and "significant weather alert" terms in First Warning—a broadcast weather alert system derived for use by local television stations—and its derivatives vary by station and market; in most cases, the system's various iterations classify the product by generic thunderstorm-specific terms that ...
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.
FR-Alert. FR-Alert is a national-level mobile risk alert and emergency communication system implemented by Intersec [9] in partnership with the Ministry of the Interior in France. This system is designed to facilitate the efficient dissemination of critical alerts and safety information to citizens throughout the country.
Since then, several classes of non-weather emergencies have been added, including, in most states, the AMBER Alert System for child abduction emergencies. In 2016, three additional weather alert codes were authorized for use in relation to hurricane events, including Extreme Wind Warning (EWW), Storm Surge Warning (SSW) and Storm Surge Watch (SSA).
Local Weather Forecast Offices (WFO) of the National Weather Service may issue a Special Weather Statement to alert of a specified hazard that is approaching or below warning or advisory criteria, that does not have a specific alert product code of their own (such as for widespread funnel clouds with limited to no threat of complete tornadogenesis, the likelihood of landspouts, or strong ...
Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.