8/15/19  7/16/20  12/31/20 AIM capable of being reported automatically. The modifier for this METAR report is “AUTO.” When an observer augments or backs − up an ASOS/AWOS site, the “AUTO” modifier disappears. (g) Anemometer (wind direction and speed sensor). (h) Rainfall accumulation sensor. (i) Automated Lightning Detection and Re- porting System (ALDARS) (excluding Alaska and Pacific Island sites). 3. The ASOS/AWOS data outlets include: (a) Those necessary for on-site airport users. (b) National communications networks. (c) Computer-generated voice (available through FAA radio broadcast to pilots, and dial-in telephone line). NOTE − Wind direction broadcast over FAA radios is in reference to magnetic north. 4. An ASOS/AWOS report without human intervention will contain only that weather data 5. There are two types of automated stations, AO1 for automated weather reporting stations without a precipitation discriminator, and AO2 for automated stations with a precipitation discriminator. As appropriate, “AO1” and “AO2” must appear in remarks. (A precipitation discriminator can deter- mine the difference between liquid and frozen/freezing precipitation).  NOTE − To decode an ASOS/AWOS report, refer to FIG 7 − 1 − 7 and FIG 7 − 1 − 8. A complete explanation of METAR terminology is located in AIM, Para 7 − 1 − 28, Key to Aerodrome Forecast (TAF) and Aviation Routine Weather Report (METAR). REFERENCE − 7 − 1 − 27 Meteorology