Leerjet 35/36 Developed for Training Purposes 5-37
February 1998
Flight Planning
FM2030 . Significant change expected in prevailing weather.
The from code (FM) is followed by a four-digit time code
(2030). Prevailing weather conditions consist a surface wind,
visibility, weather, and cloud coverage.
PROB40 2022. Probability (PROB) and a two-digit code for
percent (40) is followed by a four-digit code (2022) that indi-
cates a beginning time (20) and an ending time (22) to the
nearest whole hour for probable weather conditions. Only 30%
and 40% probabilities are used; less than these are not suffi-
cient to forecast; 50% and above support the normal forecast.
TEMPO. Temporary change followed by a four-digit time. Fore-
casts temporary weather conditions. Indicates that changes
lasting less than an hour and a half may occur anytime
between the two-digit beginning time and two-digit ending time.
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