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number (01) for this phenomena. The CWA was
issued at 2140Z and is valid until 2340Z.
EXAMPLE−
ZKC3 CWA 032140
ZKC CWA 301 VALID UNTIL 032340
ISOLD SVR TSTM over KCOU MOVG SWWD
10 KTS ETC.
7−1−7. Categorical Outlooks
a. Categorical outlook terms, describing general
ceiling and visibility conditions for advanced
planning purposes are used only in area forecasts and
are defined as follows:
1. LIFR (Low IFR). Ceiling less than 500 feet
and/or visibility less than 1 mile.
2. IFR. Ceiling 500 to less than 1,000 feet
and/or visibility 1 to less than 3 miles.
3. MVFR (Marginal VFR). Ceiling 1,000 to
3,000 feet and/or visibility 3 to 5 miles inclusive.
4. VFR. Ceiling greater than 3,000 feet and
visibility greater than 5 miles; includes sky clear.
b. The cause of LIFR, IFR, or MVFR is indicated
by either ceiling or visibility restrictions or both. The
contraction “CIG” and/or weather and obstruction to
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)
Equipment is provided at two AFSS/FSS locations in
the lower 48 States (Bridgeport, CT; Princeton,
Minnesota) and all of Alaska, by which meteorological
and aeronautical data are recorded on tapes and
broadcast continuously over selected low-frequency
(190−535 kHz) navigational aids (L/MF ranges or H
facilities) and/or VORs. 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 route-oriented data with specially prepared
NWS forecasts, Inflight Advisories, and winds aloft
plus preselected current information, such as weather
reports (METAR/ SPECI), NOTAMs, and special
notices. In some locations, the information is
broadcast over the local VOR only and is limited to
such items as the hourly weather for the parent station
and up to 5 immediately adjacent stations, local
AIM 8/5/04
7−1−18 Meteorology
NOTAM information, aerodrome forecast (TAF) for
the parent station, adverse conditions extracted from
Inflight Advisories, and other potentially hazardous
conditions. At selected locations, telephone access to
the TWEB has been provided (TEL−TWEB).
Telephone numbers for this service are found in the
FSS and National Weather Service Telephone
Numbers section of the A/FD. These broadcasts are
　
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