significant temperature and humidity levels in Part B
and D of the TEMP, TEMP MOBIL, or TEMP SHIP
coded message.
Ships and land stations outside of Region IV report
significant level winds in Parts B and D of the TEMP
message following the 21212 indicator group (fig.
4-38). Within WMO Region IV, significant level winds
are not reported. However, fixed regional level winds
are reported in Parts B and D of the PILOT, PILOT
MOBIL, or PILOT SHIP code (fig. 4-39).
The first significant level is the surface, repeating
information previously reported in Part A. All
remaining significant levels should be plotted. Plot the
temperature, dew-point depression, and winds at the
isobar level reported. You may have to estimate
between isobars and between isotherms drawn on the
diagram to locate the correct placement of the reported
information. Plot temperatures, dew-point depressions,
and significant level winds the same way as for the
mandatory levels.
Plotting Fixed Regional Level Winds
The fixed regional level winds (FRLW) are plotted
on the wind scale on the blackened circles. The altitude
scale (kilometers and thousands of feet) located just to
the right of the wind scales is used to identify the
preplotted FRLW circles on the wind scale. Remember,
although the indicated altitude increments in the coded
fixed regional level winds may be thought of as
thousands of feet, the value indicated is actually the
number of 300-meter increments above the surface. For
example, 90012 indicates three FRLWs follow, the first
at a "00" 300-meter increment altitude (surface), the
second at a "01" 300-meter increment altitude (0.3 km),
and the third at a "02" 300-meter increment altitude
(600 meters or 0.6 km). Alternatively, you may think of
the wind reports as the surface, 1,000-foot, and 2,000-
foot levels. Plot the reported wind at the blackened
TEMP CODE PART B (WMO REGION IV)
TTBB64120 72306 00030 05050 11930 06040 22770 02920 33650 10100 44600
14740 55435 29769 66358 38170 31313 46105 81135 41414 43322 51515 10153;
SYMBOLIC FORMAT
MiMiMjMj YYGGa4 IIiii
nnnnPnPnPn TnTnTanDnDn . . . . . . . . . .
31313 srrarasasa 8GGgg (9SSTwTww)
(identification)
(significant temperature and humidity levels)
(sounding system and tracking method, observation
time and SST)
41414 NhCLhCMCH
(cloud data,
51515 101. . . . . . . ;
(additional data groups)
PILOT CODE PART B (FIXED REGIONAL LEVELS-REGION IV)
PPBB 64121 72306 90012 10013 09523 10020 90346 11510 12005 12505 90789
14005 15508 16510 91246 17015 18019 18523 9205/ 20025 21530;
SYMBOLIC FORMAT
MiMiMjMj YYGGa4 IIiii
9tnu1u2u3 dddff dddff dddff . . . . . ;
(identification)
(significant wind levels)
Figure 4-39.—Significant temperature/humidity levels in TEMP code, with fixed regional level winds reported in PILOT code.
4-33
