minimum weather conditions

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• Weather-related cancellation — or sometimes a delay is when an institution is closed or its opening delayed, or an activity is cancelled or postponed due to inclement weather conditions. Certain institutions, such as schools, are likely to close when bad weather, such as snow …   Wikipedia

• Weather ship — The weather ship MS Polarfront at sea. A weather ship was a ship stationed in the ocean as a platform for surface and upper air meteorological observations for use in weather forecasting. They were primarily located in the north Atlantic and… …   Wikipedia

• weather minimum — The worst weather conditions in terms of visibility, RVR (runway visual range), and cloud ceiling for landing at a given runway or landing field either under conditions of visual flying or of instrument flying. These conditions are prescribed by… …   Aviation dictionary

• weather minimum — The worst weather conditions under which aviation operations may be conducted under either visual or instrument flight rules. Usually prescribed by directives and standing operating procedures in terms of minimum ceiling, visibility, or specific… …   Military dictionary

• weather modification — Deliberate or inadvertent alteration of atmospheric conditions by human activity, sufficient to modify the weather on a local or regional scale. Deliberate alterations include covering plants to keep them warm at night, seeding clouds to induce… …   Universalium

• below minimum — Weather conditions below the minimums prescribed by regulation for the particular action involved (e.g., landing minimums, takeoff minimums). These normally pertain to visibility or RVR (runway visual range), cloud ceiling or cloud base, minimum… …   Aviation dictionary

• IFR (instrument flight rules) conditions — Weather conditions below the minimum allowed for flight under visual flight rules, or VFR …   Aviation dictionary

• NOAA Weather Radio All Hazards — Type Weather Radio/Civil Emergency Services Branding …   Wikipedia

• National Weather Service — NWS Agency overview Formed February 9, 1870 Jurisdiction …   Wikipedia

• Numerical weather prediction — Weather models use systems of differential equations based on the laws of …   Wikipedia

• Instrument meteorological conditions — (IMC), sometimes referred to as Blind flying, is an aviation term that describes weather conditions that normally require pilots to fly primarily by reference to instruments, and therefore under Instrument Flight Rules (IFR), rather than by… …   Wikipedia