storm center

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The central area of a storm, especially the point of lowest barometric pressure within a storm.
• noun A center of trouble, disturbance, or argument.

from The Century Dictionary.

• noun The position of lowest pressure in a cyclonic storm.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the central area or place of lowest barometric pressure within a storm
• noun a center of trouble or disturbance