Examine the synoptic map for North America dated April 15, 1994
a) What is the contour interval between the isobars on the map?
b) Calculate the pressure gradient (change in pressure over distance) between the centre of low pressure over the state of Wisconsin and the centre of high pressure over the state of Idaho. Express your answer in mb km-1 and express to 2 significant digits (or 3 decimal places). A scale bar is shown in the lower left of the map. You may wish to include your calculations to show whether you followed the correct steps (for part marks), even if your final answer was incorrect.
c) What is happening in the vicinity of the Wisconsin low pressure system? Specifically, explain: o What kinds of air masses are interacting and what are their likely origins? What is the name of this type of weather system?