Label the centers of highs with a blue H and the centers of lows with a red L. Label the centers with the highest and lowest observed central pres-sures as appropriate. If the center of the high or low is located off the chart, put a U (unknown) for the central pressure unless you know the actual value. Additionally, indicate if the central pres-sures are increasing or decreasing. If the central pressure is falling, suffix the L or H with a minus sign. If the central pressure is rising, use a plus sign.

Tropical cyclones normally have names or numbers assigned to them. Enter them in red block letters near the centers and mark the cir-culation centers in red as follows:

Enter the central pressure at the center in whole millibars immediately below the symbol marking the center.

NOTE: The above tropical storm and hurri-cane symbols are used in the Northern Hemisphere.

After you have completed hardening in the fronts, isobars, and pressure centers, erase all pencil marks. Use a large, soft eraser and long even strokes in one direction. Short, quick, back and forth strokes with the eraser will often tear your chart.

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