>>>Does it vector around? Does it go over? Is it cancelled?
It would depend upon a number of things. If the tops of storms were such that they could get over them, no problem for normal routes. If the tops were higher and getting over them not possible, it may be possible to go between the storms. If that's not possible (a solid area versus a scattered area), planning around them is the way to go.
As far as cancellations go, that would be more likely a factor for flights to/from any airport in the affected area, and less likely ones that are just transiting the area at normal crusing altitudes. In the terminal area, the most prevalent effects of the storm are the crosswinds, whose velocities can easily exceed max limits, especially on a wet runway.
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.