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UNIT 7—LESSON 4

FINALIZING THE ANALYSIS

OVERVIEW Identify the correct procedures for labeling the various features of an analyzed surface chart. Identify the procedures for depicting and ana- lyzing movement, air masses, precipitation and obstructions to vision, and isallobars.

OUTLINE

Fronts

Isobar labeling

High and low centers

Tropical cyclones

Additional analysis considerations

Movement analysis

Air-mass analysis

Weather analysis

Isallobaric analysis

FINALIZING THE ANALYSIS

After the isobars and fronts have been sketched on the surface chart, it is time to com-plete the analysis. This consists of hardening in the chart with the appropriate colors, symbols, codes, and shading. To what extent this is done will vary with each command.

The requirement for additional analyses is normally based on command requirements of interpretation, forecasting, and briefing. The objective of your finished product is a chart that is highly representative, neat, and easy to read. A chart that attempts to show too much infor-mation is confusing and actually detracts from the professional picture you are trying to convey.

Learning Objective: Identify the correct procedures for labeling the various features of an analyzed surface chart.

FRONTS

Color in fronts, using felt-tip markers. Stand-ard symbols are shown in figure 7-4-1. The normal practice by the Naval Oceanography Command is to use a combination of weather analyses, monochromatic symbols, and colors. This enhances the visual effect of the final analysis. After the fronts are colored, indicate areas of frontogenesis and frontolysis, if applicable.

ISOBARS

Harden in the isobars with a medium point black felt pen. Use the following guidelines.

1. Do not try to trace your pencil lines exactly. Doing this results in rough, irregular lines. Instead, maintain a smooth, consistent flow. If you deviate slightly from the pencil lines, it will have little effect on the chart’s overall accuracy.


Figure 7-4-1.—Symbols for fronts and allied phenomena.

2. Once you put the felt pen on the map and begin tracing, keep the movement smooth and avoid any unnecessary lifting of your pen. Put a small piece of cellophane under your hand so it will move smoothly across the chart.

3. When tracing isobars that go from one end of the chart to the other, plan your route. It helps to position your chart in such a way that you draw toward you so that you can always see your pencil lines and the tip of your felt marker. Leave enough space at the beginning and end of the isobars to label them.

4. When tracing closed isobars, leave a space at the top of the closed pressure centers for isobar labeling. Figure 7-4-2 shows an example of a finished surface chart.


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