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vision symbols are used. If winds or gusts of 25 knots
or greater are forecast for the outlook period, the word
“WIND” is also included for all categories including
VFR.
EXAMPLE-
1. LIFR CIG-low IFR due to low ceiling.
2. IFR FG-IFR due to visibility restricted by fog.
3. MVFR CIG HZ FU-marginal VFR due to both ceiling
and visibility restricted by haze and smoke.
4. IFR CIG RA WIND-IFR due to both low ceiling and
visibility restricted by rain; wind expected to be 25 knots or
greater.
7-1-8. Telephone Information Briefing
Service (TIBS)
a. TIBS, provided by automated flight service
stations (AFSSs) is a continuous recording of
meteorological and aeronautical information, available
by telephone. Each AFSS provides at least four
route and/or area briefings. In addition, airspace
procedures and special announcements (if applicable)
concerning aviation interests may also be
available. Depending on user demand, other items
may be provided; i.e., METAR observations,
terminal aerodrome forecasts, wind/temperatures
aloft forecasts, etc.
b. TIBS is not intended to substitute for
specialist‐provided preflight briefings. It is, however,
recommended for use as a preliminary briefing, and
often will be valuable in helping you to make a “go or
no go” decision.
c. TIBS is provided by Automated Flight Service
Stations (AFSSs) and provides continuous telephone
recordings of meteorological and/or aeronautical
information. Specifically, TIBS provides area and/or
route briefings, airspace procedures, and special
announcements (if applicable) concerning aviation
interests.
d. Depending on user demand, other items may be
provided; i.e., surface observations, terminal forecasts,
winds/temperatures aloft forecasts, etc. A
TOUCH‐TONE telephone is necessary to fully
utilize the TIBS program.
e. Pilots are encouraged to avail themselves of this
service. TIBS locations are found at AFSS sites and
can be accessed by use of 1-800-WX BRIEF toll free
number.
7-1-9. Transcribed Weather Broadcast
(TWEB) (Alaska Only)
Equipment is provided in Alaska by which
meteorological and aeronautical data are recorded on
tapes and broadcast continuously over selected L/MF
and VOR facilities. Broadcasts are made from a series
of individual tape recordings, and changes, as they
occur, are transcribed onto the tapes. The information
provided varies depending on the type equipment
available. Generally, the broadcast contains a
summary of adverse conditions, surface weather
observations, pilot weather reports, and a density
altitude statement (if applicable). At the discretion of
the broadcast facility, recordings may also include a
synopsis, winds aloft forecast, en route and terminal
forecast data, and radar reports. At selected locations,
telephone access to the TWEB has been provided
(TEL-TWEB). Telephone numbers for this service
are found in the Supplement Alaska A/FD. These
AIM 2/14/08
7-1-20 Meteorology
broadcasts are made available primarily for preflight
and inflight planning, and as such, should not be
considered as a substitute for specialist-provided
preflight briefings.
7-1-10. Inflight Weather Broadcasts
a. Weather Advisory Broadcasts. ARTCCs
broadcast a Severe Weather Forecast Alert (AWW),
Convective SIGMET, SIGMET, or CWA alert once
on all frequencies, except emergency, when any part
of the area described is within 150 miles of the
airspace under their jurisdiction. These broadcasts
contain SIGMET or CWA (identification) and a brief
description of the weather activity and general area
affected.
EXAMPLE-
1. Attention all aircraft, SIGMET Delta Three, from Myton
to Tuba City to Milford, severe turbulence and severe clear
icing below one zero thousand feet. Expected to continue
beyond zero three zero zero zulu.
2. Attention all aircraft, convective SIGMET Two Seven
Eastern. From the vicinity of Elmira to Phillipsburg.
Scattered embedded thunderstorms moving east at one
zero knots. A few intense level five cells, maximum tops four
five zero.
3. Attention all aircraft, Kansas City Center weather
advisory one zero three. Numerous reports of moderate to
severe icing from eight to niner thousand feet in a three zero
mile radius of St. Louis. Light or negative icing reported
from four thousand to one two thousand feet remainder of
Kansas City Center area.
NOTETerminal
control facilities have the option to limit the
AWW, convective SIGMET, SIGMET, or CWA broadcast as
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