Afront that spirals counterclockwise in the northern hemisphere is called a

Hurricane

Explanation:

Coriolis force is a weak force at the equator and hence it is able to deflect hurricane only when it is at a faraway distance from equator. This force tends to create winds with circular motion with respect to the surface of earth. Such circular winds or air flows are called as Hurricane.  

Basically, Hurricane can move in counter-clockwise direction in the northern hemisphere and in the opposite direction while it propagates in the southern hemisphere

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)