2/14/08 JO 7110.10T
Transcribed Weather Broadcasts (TWEB) (Alaska Only) 2-2-1
Section 2. Transcribed Weather Broadcasts (TWEB)
(Alaska Only)
2-2-1. GENERAL
a. Transcribed weather broadcast service provides
continuous aeronautical and meteorological information
on L/MF and VOR facilities.
b. At TWEB equipment locations controlling two
or more VORs, the one used least for ground-to-air
communications, preferably the nearest VOR, may
be used as a TWEB outlet simultaneously with the
NDB facility. Where this is accomplished, capability
to manually override the broadcast shall be provided
for emergency communications.
2-2-2. CONTENT
User needs should dictate the content of these recordings.
Required items are denoted with an asterisk (*).
a. *Introduction. State the preparation time.
PHRASEOLOGYTRANSCRIBED
AVIATION WEATHER BROADCAST
PREPARED AT (time) ZULU.
b. *Adverse Conditions. Extracted from WST,
WS, WA, CWA and AWW.
PHRASEOLOGYWEATHER
ADVISORIES ARE IN EFFECT FOR
(adverse conditions) OVER (geographical area)
(summary).
c. Synopsis. A brief statement describing the type,
location, and movement of weather systems and/or
masses which might affect the route or the area.
d. TWEB Route Forecasts. Broadcast from
appropriate forecast data. Include the valid time of
forecasts.
PHRASEOLOGYROUTE
FORECAST(S) VALID UNTIL (time) ZULU.
e. Winds Aloft Forecast. Broadcast winds aloft
forecast for the location nearest to the TWEB. The
broadcast should include the levels from 3,000 to
12,000 feet, but shall always include at least two
forecast levels above the surface.
PHRASEOLOGYWINDS
ALOFT FORECAST VALID UNTIL (time) ZULU.
(Location) (Altitude) (direction) AT (speed).
f. Radar Reports (RAREP). Use local or pertinent
RAREPs. If the facility has access to real time
weather radar equipment, summarize observed data
using the RAREPs to determine precipitation type,
intensity, movement, and height.
g. *Surface Weather Reports. Record surface
reports as described in para 2-1-6, Weather Report
Phraseology.
1. Broadcast local reports first, then the
remainder of the reports beginning with the first
station east of true north and continuing clockwise
around the TWEB location.
2. Announce the location name of a surface
report once.
(a) Surface weather broadcast introduction:
PHRASEOLOGYAVIATION
WEATHER, (4 digits of time), ZULU
OBSERVATIONS.
(b) Special weather reports:
PHRASEOLOGY-
(Location name) SPECIAL REPORT (last 2 digits of time)
OBSERVATION, (weather report).
h. *Density Altitude. Include temperature and the
statement “CHECK DENSITY ALTITUDE” as part
of the surface weather broadcast for any station with
a field elevation of 2,000 feet MSL or above that
meets the following criteria: (See TBL 2-2-1.)
TBL 2-2-1
Density Altitude
Field Elevation Temperature (C)
2,000-2,999 29 degrees or higher
3,000-3,999 27 degrees or higher
4,000-4,999 24 degrees or higher
5,000-5,999 21 degrees or higher
6,000-6,999 18 degrees or higher
7,000-higher 16 degrees or higher
i. Pilot Weather Reports. Summarize PIREPs and,
if the weather conditions meet soliciting requirements,
append a request for PIREPs.
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