VALID 211600/212000 HVY SN 25CM FCST=

• This is an Aerodrome Warning valid from 1600 UTC to 2000 UTC on the 21^st - heavy snow 25 cm forecasted.

Aerodrome warnings will be issued for the following hazards:

a) gales
b) strong wind warnings when mean speed exceeding 20 kt (gust 28 kt) or 25 kt (gust 37 kt) dependent on aerodrome requirements
c) thunderstorms, hail or squalls
d) snow
e) frost warnings including hoar frost and glaze or rime ice
f) fog (when the visibility is expected to fall below 600 m)
g) freezing precipitation

ICAO Annex 3
Chapter 7
7.3 Aerodrome warnings
7.3.1 Aerodrome warnings shall be issued by the aerodrome meteorological office designated by the meteorological authority concerned and shall give concise information of meteorological conditions which could adversely affect aircraft on the ground, including parked aircraft, and the aerdrome facilities and services.

---

A SNOWTAM includes information about braking action and runway surface contamination.