Page 360 - PPL-engelsk 2025

Meteorology

TREND is used to give pilots and air traffic control an idea of how the weather

is expected to develop in the short term (2 hours).

The terms in a TREND are shown below:

3.11.5.6 NOSIG, BECMG, TEMPO

NOSIG (No Significant Changes) means no significant weather changes are

expected in the next 2 hours.

BECMG (Becoming) indicates a change is expected, followed by FM (From), TL
(To), or AT (At a specific time).

The sketch shows

a BECMG TL with a

change in visibility

from 4000m to

1000m starting at

0650 UTC.

If temporary changes are expected that are expected to last for the entire

period of the forecast, this is indicated with TEMPO (temporary). A TEMPO

value must have a maximum duration of 1 hour and must be less than half the

time in total.

In this example,

short-term
periods of

reduced visibility

are expected

after 7:00 AM

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 360