Metro-02
Meteorology and Flight Planning
Overlay 4
5.
Transcribed Weather Broadcasts (TWEB)
Transcribed Weather
Broadcasts
a.
Recorded weather information transmitted over
selected NDB and VOR stations
b.
Amount and type of weather information vary
from station to station, but can include local
weather, route weather, winds aloft, and
terminal aerodrome forecasts
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6.
Hazardous In-flight Weather Advisory Service
Hazardous In-flight
(HIWAS)
Weather Advisory
Service
a.
Broadcasts continuously over selected VOR
stations
b.
Contains summary of any AIRMETs, SIGMETs,
convective SIGMETs, CWAs and PIREPs
Overlay 6
7.
Automated Weather Observation System (AWOS)
Automated Weather
Observation System
a.
AWOS is a real-time system consisting of
various sensors, a processor, a computer-
generated voice subsystem, and transmitter to
broadcast local minute-by-minute weather
directly to the aircraft
(1) AWOS observations derived from an
automated system will include the prefix
"AWOS"
(2) Some AWOS locations will be augmented
by certified observers who will provide
weather and obstruction to visibility
information in the remarks of the report
when the reported visibility is less than
3 miles. Augmentation is identified as
"OBSERVER WEATHER"
(3) The reported visibility is derived from a
sensor near the touchdown of the primary
instrument runway
(7-97) Original
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