The upper-air analyses and prognosis charts are all very similar. Analyses are routinely produced for the 850-, 700-, 500-, 400-, and

300-, and 200-millibar levels. Figure 4-2-5 shows an 850-millibar analysis on a polar stereographic map projection as used in the mid-latitudes. Figure 4-2-6 shows a 500-millibar, 48-hour prog-nosis. Except for the chart identification and contour labeling, these charts are very similar. The winds, temperature, and height prognosis data fields are usually combined on a single chart for each of the various constant-pressure surfaces. Winds are represented with standard plots; height contours (isoheights), by solid lines; and temperature (isotherms), by dashed lines.

All charts use a 5C isotherm interval, with the temperatures labeled in degrees Celsius. The 850-millibar chart uses a 30-meter isoheight interval; the 700- and 500-millibar charts use a 60-meter isoheight interval; and the 400-, 300-, and 200-millibar charts use a 120-meter

isoheight interval. While the 500-millibar level is routinely available in 12-hour increments out to 120 hours, and the other levels are routinely available in 12-hour increments out to 72 hours, the charts transmitted on the Fleet Facsimile broadcasts are usually limited fore-to the 24- and 48-hour forecasts. Generally, products distributed to the fleet are tailored by the NOC centers.

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