On April 6, 2010 the Upper Midwest was visited by strong surface winds, which blew at nearly 15 m s-1 in Madison. Which of the two statements below more accurately describes the meteorological conditions in the region that day?
(a) Small differences in sea-level pressure existed from station to station across the area.
(b) Large differences in sea-level pressure existed from station to station across the area.
(a) Small differences in sea-level pressure existed from station to station across the area.
(b) Large differences in sea-level pressure existed from station to station across the area.