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SNOWTAM : International Civil Aviation Organisation (ICAO) defines SNOWTAM as a special series Notice To Airmen notifying the presence, or removal, of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area, by means of a specific format. A SNOWTAM will be issued by the airport authority, when warranted, to notify users of the presence of, or the removal of, hazardous conditions on the movement surfaces of the aerodrome.
ASHTAM : The ASHTAM provides information on the status of activity of a volcano when a change in its activity is, or is expected to be, of operational significance. In the event of a volcanic eruption producing ash cloud of operational significance, the ASHTAM also provides information on the location, extent, and movement of the ash cloud and the air routes and flight levels affected. The maximum validity period of ASHTAM is 24 hours. A new ASHTAM must be issued whenever there is a change in the level of alert.
BIRDTAM : A BIRDTAM is a specialised Notice To Airmen providing information regarding bird strike risk or warning, particularly for low-level airspace. Unlike ASHTAM or SNOWTAM, BIRDTAM is not an official International Civil Aviation Organisation term and is not in universal use. However, the term BIRDTAM is recognised in the European Aeronautical Information System Database (EAD) and has its own Aeronautical Fixed Telecommunication Network (AFTN) address.
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