ICAO Standard
ICAO Standard:
Annex 3 — Meteorological Service for International Air Navigation
4.3 Routine observations and reports
.
.
.
Note.— Meteorological information used in ATIS (voice-
ATIS and D-ATIS) is to be extracted from the local routine
report, in accordance with Annex 11, 4.3.6.1 g).
.
.
.
4.6 Observing and reporting meteorological elements
4.6.1 Surface wind
4.6.1.1 The mean direction and the mean speed of the
surface wind shall be measured, as well as significant variations
of the wind direction and speed, and reported in degrees
true and kilometres per hour (or knots), respectively.
...
Annex 11 — Air Traffic Services
4.3.6.1 g) the meteorological information shall be extracted from
the local meteorological routine or special report.
Happy Easter