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decision.
VFR FLIGHT RECOMMENDATION—If the weather
specialist indicates that VFR flight is not recommended,
it means that, in the briefer’s judgment,
it is doubtful that the flight can be conducted
under VFR conditions. Although, the final go, nogo
decision, does rest with the pilot.
SYNOPSIS—This is a broad overview of the major
weather systems or airmasses that will affect the
flight.
CURRENT CONDITIONS—This information is a
rundown of existing conditions including pertinent
hourly, pilot, and radar weather reports. It is
normally omitted when the departure time is
more than 2 hours in the future.
ENROUTE FORECAST—This information summarizes
the forecast conditions along the route of
flight for cross-country flights and is omitted for
local flights.
DESTINATION FORECAST—For cross-country
flights, the briefer will provide the forecast for
the destination airport for 1 hour before and after
the estimated time of arrival (ETA).
WINDS AND TEMPERATURES ALOFT—This can
be of particular interest to soaring pilots. This is
summary of the winds along a route of flight. At
the pilots request, the weather briefer can interpolate
wind direction and speed between levels
and reporting stations for various altitudes.
Temperature is also provided only on request.
NOTICES TO AIRMEN—The briefer will supply
notices to airman (NOTAM) information pertinent
to the proposed flight. However, information,
which has already been published in the
NOTAM publication, is only provided on
request.
AIR TRAFFIC CONROL DELAYS—This information
advises of any known Air Traffic Control
(ATC) delays. Soaring pilots don’t normally
need this information, unless they are flying a
self-launch glider and the flight will terminate at
an airport with a control tower.
OTHER INFORMATION—Upon request the briefer
can provide other information, such as density
altitude data, military operations areas (MOA),
military training routes (MTR) within 100 nautical
miles of the fight plan area.
An abbreviated briefing is used to update weather
information from a previous briefing or when requesting
specific information. This allows the briefer to
limit the search for weather data to that information
that has changed or can have a significant impact on
the proposed flight. The briefer will automatically
include adverse weather conditions, both present or
forecast.
For a flight with a departure time of 6 or more hours
away, an outlook briefing should be requested. This
briefing provides forecast information appropriate to
the proposed flight in order to help make a go no-go
decision. An outlook briefing is designed for planning
purposes only and a standard briefing should be
requested just before the departure time to acquire current
conditions and the latest forecasts.
DIRECT USER ACCESS TERMINAL SYSTEM
The FAA-funded direct user access terminal system
(DUATS), allows pilots with a current medical certificate
to receive weather briefings and file flight plans
directly via personal computer and modem. The information
on DUATS sites is presented in textual format,
which requires some skill and practice to interpret.
Information for the current DUATS providers can be
found in the Aeronautical Information Manual (AIM).
ON THE INTERNET
Weather related information can be found on the
Internet including sites directed toward aviation.
These sites can be found using a variety of Internet
search engines. It is import to verify the timeliness and
source of the weather information provided by the
Internet sites to ensure the information is up-to-date
and accurate. Pilots should exercise caution when
accessing weather information on the Internet especially
if the information cannot be verified. One source
of accurate weather information is the National
Weather Service site located at: www.nws.noaa.gov.
9-27
INTERPRETING WEATHER CHARTS,
REPORTS, AND FORECASTS
Knowing how and where to gather weather information
is important but the ability to interpret and understand
the information requires additional knowledge
and practice. Weather charts and reports are merely
records of observed atmospheric conditions at certain
locations at specific times. Trained observers using
electronic instruments, computers, and personal observations
produce the weather products necessary for
pilots to determine if a flight can be conducted safely.
This same information can be used by soaring pilots to
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Glider Flying Handbook(124)
