To complete the isobars in Figure 1B-1, refer to the Tips on Drawing Isobars in
Investigation 1A. More than one isobar of the same value should be drawn if
pressure values located in separate sections of the map require it. Consider each
pressure value at the center of the number. Isobars with values of 1008, 1012 and
1016 mb have already been started but look for other areas that require the
additional 1016 and/or 1020 intervals as well. The labels for the isobars are added
at the end of the land mass or at the map's boundary. For closed isobar references
in a circle, the number is placed in the line itself.
Draw and label isobars of the series where they existed over the remaining
portions of the U.S. and Canada. (Some isobars were intentionally left
incomplete.) After completing all the isobars, label the positions with the lowest
value in the U.S. mid-section with bold Ls. Label the highest pressure in the
southeastern U.S. with an H.