From the NWS discussion...
THE QUICKER A SYSTEM STRENGTHENS THE MORE LIKELY IT WILL CONFINE ASCENT/PRECIP CLOSE TO ITS CORE DUE TO AGEOSTROPHIC ACCELERATIONS RESULTING FROM ISALLOBARIC WIND COMPONENT.
Now that's one of the most technical statements I've ever seen for the Wilmington NWS... I haven't researched it yet... any comments from others? Laymans terms, LOL...
Look at the pretty colors...