IRFP-01
Metro Review
c.
Disseminated 4 times daily
d. Symbology
(1) Scalloped lines depict areas of widespread or embedded
thunderstorms
(2) Broken lines display areas of CAT
(3) Depicts location of weather hazards, including widespread
sandstorms or dust storms, squall lines, and tropical
storms
(4) Arrows and wind flags show position and speed of jet
stream
(5) Square boxes show height of the tropopause
NOTE: Meteorologists utilize the low-level significant Wx
Prog chart more than the high-level. All of the high-level
information is available from other sources, e.g., constant
pressure charts. Many weather offices choose to not
receive this facsimile from the National Weather Service.
3. Winds Aloft Prognostic charts
Fig 23: Winds Aloft
Prognostic Chart
a. Computer-prepared forecasts of wind speed and direction and
outside air temperature (OAT) for true altitudes of 6,000 ft,
9,000 ft, and 12,000 ft
NOTE: Charts are also available for the true altitudes of
18,000 ft (500 mbs), 24,000 ft (400 mbs), 30,000 ft (300 mbs),
34,000 ft (250 mbs), 39,000 ft (200 mbs), which approximate
the constant pressure charts.
b. Flight planning applications include computation of ground
speed, time en route, and other performance figures
NOTE: Although the winds aloft prognostic charts are
considered accurate for a quick ready reference, the winds
aloft forecast (FA) teletype report is considered to be more
accurate.
c.
Disseminated 2 times daily in 12-hour prognostics
(1) 8-panel chart
(2) Chart does not forecast winds and temperature for a given
time but considered average winds for the period of the
chart, for use until next chart received
(8-97) Original
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