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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.
NOTE−
Terminal 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.
b. Hazardous Inflight Weather Advisory Service
(HIWAS). This is a continuous broadcast of
inflight weather advisories including summarized
AWW, 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 as described in the preceding
paragraph. 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.
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,
Convective SIGMET, or CWA.
EXAMPLE−
Attention all aircraft. Hazardous weather information
(SIGMET, Convective SIGMET, AIRMET, Urgent Pilot
Weather Report (UUA), or Center Weather Advisory
(CWA), Number or Numbers) for (geographical area)
available on HIWAS, Flight Watch, or Flight Service
frequencies.
2. In HIWAS ARTCC areas, AFSS/FSSs will
broadcast a HIWAS update announcement once on all
except emergency frequencies upon completion of
recording an update to the HIWAS broadcast.
Included in the broadcast will be the type of advisory
updated; e.g. AWW, SIGMET, Convective SIGMET,
CWA, etc.
EXAMPLE−
Attention all aircraft. Hazardous weather information for
(geographical area) available from Flight Watch or Flight
Service.
3. HIWAS availability is shown on IFR Enroute
Low Altitude Charts and VFR Sectional Charts. The
symbol depiction is identified in the chart legend.
2/17/05 AIM
Meteorology 7−1−19
7−1−11. Flight Information Services Data
Link (FISDL)
a. FISDL. FISDL systems are comprised of two
basic types: broadcast systems and two−way systems.
Broadcast system components include a ground
or space−based transmitter, an aircraft receiver, and
a cockpit display. Two−way systems utilize transmitter/
receivers at both the ground or space−based site
and the aircraft.
1. Broadcast FISDL allows the pilot to collect
weather and operational data passively and to call up
that data for review at the appropriate time. In
addition to textual weather products such as Aviation
Routine Weather Reports (METARs) and Terminal
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