Lynx
®
NGT-9000
Pilot’s Guide
1-13
Description
Product
deScriPtion
SIGMET,
Convective
A Convective SIGMET will be issued when the fol-
lowing conditions are occurring or, in the judgment of
the forecaster, are expected to occur:
a. A line of thunderstorms at least 60 miles long with
thunderstorms affecting at least 40 percent of its
length.
b. An area of active thunderstorms affecting at least
3,000 square miles covering at least 40 percent of
the area concerned and exhibiting a very strong
radar reflectivity intensity or a significant satellite
or lightning signature.
c. Embedded or severe thunderstorm (s) expected
to occur for more than 30 minutes during the valid
period regardless of the size of the area.
TAF
Terminal Aerodrome Forecast is a format for report-
ing aviation weather forecast information. Generally
a TAF is a 9- or 12-hour forecast, though some TAFs
can cover an 18- or 24-hour period. TAFs comple-
ment and use similar encoding to METAR reports.
They are produced by a human forecaster based on
the ground. For this reason there are fewer TAF lo-
cations than there are METARs. TAFs can be more
accurate than Numerical Weather Forecasts, since
they take into account local, smallscale, geographic
effects.
Winds and
Tempera-
tures Aloft
Winds and Temperature Aloft Forecast is forecast for
specific atmospheric conditions in terms of wind and
temperature in a specific altitude measured mostly in
feet (ft) above mean sea level (MSL). The forecast is
specifically used for aviation purposes.
Table 1-2: Description of FIS-B Available Information (continued)
Summary of Contents for 9029000-20000
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