Plotting Significant Levels

Figure 4-34.Plotting reported altitude of the surface and mandatory-pressure level.

Aerographers Mate, Module 01-Surface Weather Observations
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center and/or left wind scales. The right-most wind scale is used to transfer wind history from a previously plotted diagram. The wind shaft is drawn extending from the small, nondarkened circle at each mandatory level isobar in the same manner that a constant-pressure level wind is plotted. For plotting wind direction, true north is the top of the chart, and due south, the bottom of the chart. The shaft extends toward the reported wind direction, the tens value of the wind direction is written near the end of the shaft, and the odd five-degree increments of reported direction are indicated by a small plus sign (+) after the tens value of the direction. Wind speed is indicated on the wind shaft in the same manner as surface and constant-pressure level plots (fig. 4-37). The data for the mandatory pressure levels above 100 hectopascals is obtained from message Part C, and plotted in the same manner. Levels of missing data are noted on the diagram just above the last available reported data. Figure 4-37.—Wind direction and speed plotted at each mandatory pressure level. After the mandatory level data is plotted, the pressure altitude curve may be drawn. This is discussed following this section on plotting data, but must be accomplished before fixed regional level winds are plotted. Plotting Significant Levels All significant level data is normally plotted in addition to the mandatory level data. All stations report TEMP CODE PART B (NON-REGION IV)—Significant level indicators for both temperature/humidity and winds are bolded. TTBB 64120 47580 00030 05050 11930 06040 22770 02920 33650 10100 44600 14740 55435 29769 66358 38170 21212 00030 13015 11990 17022 22985 17035 33972 17015 44925 18005 55860 19015 66700 20025 77550 22040 88320 23050 99300 23070 11260 23112 22220 23090 33100 24060 31313 46105 81135 41414 43322; SYMBOLIC FORMAT— M_iM_iM_jM_j YYGGa₄ IIiii (identification) n_nn_nP_nP_nP_n T_nT_nT_anD_nD_n ..... ..... (significant temperature and humidity levels) 21212 n_nn_nP_nP_nP_n d_nd_nf_nf_nf_n ..... ..... (significant wind levels - not included in Region IV) 31313 s_rr_ar_as_as_a 8GGgg (9S_sT_WT_WT_W) (sounding system and tracking method, observation time and SST) 41414 N_hC_LhC_MC_H; (cloud data) Figure 4-38.—Significant temperature/humidity and wind levels as reported in TEMP code. 4-32

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