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purposes are used only in area forecasts. They are
defined as follows:
4.1.1 LIFR (Low IFR)-Ceiling less than 500 feet
and/or visibility less than 1 mile.
4.1.2 IFR-Ceiling 500 to less than 1,000 feet and/or
visibility 1 to less than 3 miles.
4.1.3 MVFR (Marginal VFR)-Ceiling 1,000 or
3,000 feet and/or visibility 3 to 5 miles inclusive.
4.1.4 VFR-Ceiling greater than 3,000 feet and
visibility greater than 5 miles; includes sky clear.
4.2 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.
EXAMPLELIFR
CIG-low IFR due to low ceiling.
IFR FG-IFR due to visibility restricted by fog.
MVFR CIG HZ FU-marginal VFR due both to ceiling and
to visibility restricted by haze and smoke.
IFR CIG RA WIND-IFR due both to low ceiling and to
visibility restricted by rain; wind expected to be 25 knots or
greater.
30 AUG 07
AIP
United States of America
GEN 3.5-20
15 MAR 07
Nineteenth Edition Federal Aviation Administration
5. Telephone Information Briefing Service
(TIBS)
5.1 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 are also available.
Depending upon user demand, other items may be
provided; i.e., METAR observations, terminal airport
forecasts, winds aloft, and temperatures aloft
forecasts.
6. Inflight Weather Broadcasts
6.1 Weather Advisory Broadcasts. ARTCCs'
broadcast a Severe Weather Forecast Alert (AWW),
Convective 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.
EXAMPLEAttention
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.
EXAMPLEAttention
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.
EXAMPLEAttention
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 follows: local control and approach control positions
may opt to broadcast SIGMET or CWA alerts only when
any part of the area described is within 50 miles of the
airspace under their jurisdiction.
6.2 Hazardous Inflight Weather Advisory Service
(HIWAS). This is a continuous broadcast of
inflight weather advisories including summarized
AWWs, SIGMETs, Convective SIGMETs, CWAs,
AIRMETs, and urgent PIREPs. HIWAS has been
adopted as a national program and will be
implemented throughout the conterminous U.S. as
resources permit. In those areas where HIWAS is
commissioned, ARTCC, Terminal ATC, and AFSS/
FSS facilities have discontinued the broadcast of
inflight advisories. HIWAS is an additional source of
hazardous weather information which makes these
data available on a continuous basis. It is not,
however, a replacement for preflight or inflight
briefings or real-time weather updates from Flight
Watch (EFAS). As HIWAS is implemented in
individual center areas, the commissioning will be
advertised in the Notices to Airmen publication.
6.2.1 Where HIWAS has been implemented, a
HIWAS alert will be broadcast on all except
emergency frequencies once upon receipt by ARTCC
and terminal facilities which will include an alert
announcement, frequency instruction, number, and
type of advisory updated; e.g., AWW, SIGMET,
　
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