Question

the weather map above represents pressure readings and wind speeds at the earths surface.
in the weather map above, the approximate pressure at the point where illinois, iowa, and missouri meet is ____.
a 1002 mb
b 1000 mb
c 998 mb
d 996 mb

Explanation:

Step1: Analyze the contour lines

The contour lines (isobars) on the weather map. The point where Illinois, Iowa, and Missouri meet is between the 1000 mb and 996 mb isobars.

Step2: Determine the pressure value

Since the isobars are spaced at 4 - mb intervals (e.g., 996, 1000, 1004 etc.), and the point is closer to 996 mb than to 1000 mb. But wait, looking at the map again, the isobar pattern: the value at the center of the low - pressure system (marked L) is 996 mb. The point where Illinois, Iowa, and Missouri meet is on the 998 mb isobar (as the interval between 996 and 1000 is 4, so the intermediate value is 998).

Answer:

C. 998 mb