In St. Louis, MO, the 1016-isobar runs parallel to the Missouri River, intersecting the border with
I
Illinois aligned mostly east-west. Given the 4-mb interval convention, this line will separate valu
where the lower values on the map remain to one side while higher values are on the other side.
pressure values of locations north of St. Louis are
1016 mb.
a. less than
b. equal to
c. greater than
ure 1B-2 is the analyzed surface pressure map from Weather Studies