美国航行情报汇编 AERONAUTICAL INFORMATION PUBLICATION AIP 1(146)

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NOTE.
Any other information is advisory only.
8.2.3.2 AWOS.AV reports altimeter and visibility;
NOTE.
Any other information is advisory only.
8.2.3.3 AWOS.l usually reports altimeter setting, wind data, temperature, dew point, and density altitude.
8.2.3.4 AWOS.2 provides the information provided by AWOS.l, plus visibility.
8.2.3.5 AWOS.3 provides the information provided by AWOS.2, plus cloud/ceiling data.
8.2.3.6 AWOS. 3P provides reports the same as the AWOS 3 system, plus a precipitation identification sensor.
8.2.3.7 AWOS. 3PT reports the same as the AWOS 3P System, plus thunderstorm/lightning reporting capability.
8.2.3.8 AWOS. 3T reports the same as AWOS 3 system and includes a thunderstorm/lightning reporting capability.
8.2.3.9 AWOS. 4 reports the same as the AWOS 3 system, plus precipitation occurrence, type and accumulation, freezing rain, thunderstorm, and runway surface sensors.
8.2.4 The information is transmitted over a discrete VHF radio frequency or the voice portion of a local NAVAID. AWOS transmissions on a discrete VHF radio frequency are engineered to be receivable to a maximum of 25 NM from the AWOS site and a maximum altitude of 10,000 feet AGL. At many locations, AWOS signals may be received on the surface of the airport, but local conditions may limit the maximum AWOS reception distance and/or altitude. The system transmits a 20. to 30.second weather message updated each minute. Pilots should monitor the designated frequency for the automated weather broadcast. A description of the broadcast is contained in paragraph 8.3, Automated Weather Observing System (AWOS) Broadcasts. There is no two.way communication capability. Most AWOS sites also have a dial.up capability so that the minute.by.minute weather messages can be ac-cessed via telephone.
8.2.5 AWOS information (system level, frequency, phone number) concerning specific locations is published, as the systems become operational, in the Airport/Facility Directory and, where applicable, on published Instrument Approach Procedure (IAP) charts. Selected individual systems may be incorpo-rated into nationwide data collection and dissemina-tion networks in the future.

8.3 Automated Weather Observing System (AWOS) Broadcasts. Computer.generated voice is used in AWOS to automate the broadcast of the minute.by.minute weather observations. In addi-tion, some systems are configured to permit the addition of an operator.generated voice message; e.g., weather remarks, following the automated parameters. The phraseology used generally follows that used for other weather broadcasts. Following are explanations and examples of the exceptions.
8.3.1 Location and Time. The location/name and the phrase “AUTOMATED WEATHER OBSERVA-TION” followed by the time are announced.
8.3.1.1 If the airport’s specific location is included in the airport’s name, the airport’s name is announced.
EXAMPLE.
“Bremerton National Airport automated weather observa-tion one four five six zulu.”
“Ravenswood Jackson County Airport automated weather observation one four five six zulu.”
8.3.1.2 If the airport’s specific location is not included in the airport’s name, the location is announced followed by the airport’s name.
EXAMPLE.
“Sault Ste. Marie, Chippewa County International Airport automated weather observation.”
“Sandusky, Cowley Field automated weather observa-tion.”
8.3.1.3 The word “TEST” is added following “OBSERVATION” when the system is not in commissioned status.
EXAMPLE.
“Bremerton National Airport automated weather observa-tion test one four five six zulu.”
8.3.1.4 The phrase “TEMPORARILY INOPERA-TIVE” is added when the system is inoperative.
EXAMPLE.
“Bremerton National Airport automated weather observ-ing system temporarily inoperative.”
8.3.2 Ceiling and Sky Cover
8.3.2.1 Ceiling is announced as either “CEILING” or “INDEFINITE CEILING.” The phrases “MEA-SURED CEILING” and “ESTIMATED CEILING” are not used. With the exception of indefinite ceilings, all automated ceiling heights are measured.
EXAMPLE.
“Bremerton National Airport automated weather observa-tion one four five six zulu, ceiling two thousand overcast.”
“Bremerton National Airport automated weather observa-tion one four five six zulu, indefinite ceiling two hundred.”
8.3.2.2 The word “CLEAR” is not used in AWOS due to limitations in the height ranges of the sensors. No clouds detected is announced as, “No clouds below XXX” or, in newer systems as, “Clear below XXX” (where XXX is the range limit of the sensor).
EXAMPLE.
“No clouds below one two thousand.”
　
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