A Pilot Report (PIREP) is a report of weather conditions encountered by an aircraft during a flight. This information is usually relayed by radio to the nearest ground station.
PILOT REPORT A report of in-flight weather by an aircraft pilot or crew member. Often referred to as a PIREP.
Pilot Report.
RADAT:..........Freezing Level.
Prevailing Visibility:.........Visibility over 1/2 of the horizon circle.
RVR:........................Runway Visual Range:
Sigmet:...................
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: alert, Augmented report, Automated Report, MARS, METAR, Pilot Report, PIREP, Present weather, Report, RPRT
Hail Spike - permalink - collapse ...
For example, in upper air measurements and observations "rabals" (radiosonde balloons), "pibals" (pilot balloons), and "pireps" (pilot reports) are used to determine the strength and direction of winds aloft.
This term is applied to those in-flight observations that are conducted on a fairly complete and formal basis, such as in aircraft weather reconnaissance. Compare pilot report, apob, aircraft sounding.
 See also: Report, Thunderstorm, Weather, Thunder, Cloud
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