Curvature in the base of a trough causes parcels to spin _____ and thus acquire _ relative vorticity in the northern hemisphere. A. Counterclockwise, negative B. Counterclockwise, positive C. Clockwise, negative D Clockwise, positive In Lake County in June, the warm sector would typically be dominated by a ____________ airmass. A. continental polar B. continental tropical C. maritime polar D. maritime tropical

Curvature in the base of a trough causes parcels to spin counterclockwise and thus acquire positive relative vorticity in the northern hemisphere.

In Lake County in June, the warm sector would typically be dominated by a continental polar air mass .

Explanation:

1 . Vorticity - is a clockwise or the counterclockwise spin in the troposphere layer . The reason for vorticity is the Troughs and ridges and some embedded waves or the height centers .

Since,

Low pressure is associated with rising of air and the high pressure is associated with sinking air .

Therefore ,

a counterclockwise spin produces a Positive Vorticity and The clockwise spin in the northern hemisphere produces a negative vorticity .

2. Continental polar -

These are the dry and cold , but not as cold as the Arctic masses.

Usually formed towards the south and in winters across the USA . In summers , dominates across the USA . These air masses are responsible for a pleasant weather during the summer in the North.