INSTRUMENT FLIGHT RULES (IFR) Refers to the general weather conditions pilots can expect at the surface and applies to the weather situations at an airport during which a pilot must use instruments to assist take off and landing.
Instrument Flight Rules
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Instrument Flight Rules, LIFR, Marginal Visual Flight Rules, MRGL, MVFR, VFR
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Low Instrument Flight Rules
Lifted Index
(abbrev. LI)- A common measure of atmospheric instability.
IFR Abbreviation for Instrument Flight Rules, but commonly used to refer to the weather and/or flight conditions to which these rules apply, i.e. low visibility.
IFR:Instrument Flight Rules.
IFR Weather Conditions: Ceiling less than 1,000 ft. and/or visibility less than 3 miles.
Marginal VFR Weather:Marginal Visual Flight Rules.
Marginal VFR Weather: Ceilings greater than or equal to1,000 ft.
These generally advise motorists to avoid travel until the fog burns off or other conditions improve. Airport travel is also often delayed by low visibility, sometimes causing long waits due to instrument flight rules and wider spacing of aircraft.
 See also: Weather, Air, Storm, High, Earth
  
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