Because of the rotation of the earth on its axis, a force arises which
tends to deflect to the right all motions in the northern hemisphere,
and to the left all motions in the southern hemisphere. The winds
flowing toward the storm center are turned to the right or left and move
in a spiral around the storm center. This system of whirling winds
around a central region of low pressure produce what is termed a
cyclonic storm. Storms have a tendency to move in an easterly or
northeasterly direction, and at a rate of from five hundred to seven
hundred miles a day. Cyclonic storms, although we look upon them as
being very severe, are very often mild and not of an intensive
character.