.
A band is just exiting your area. Take a look at these and you'll see what I mean:
http://www.intellicast.com/Local/USLocalWide.asp?loc=kbyx&seg=LocalWeather&prodgrp=RadarImagery&product=BaseReflectivity&prodnav=none
http://www.intellicast.com/Local/USLocalWide.asp?loc=kbyx&seg=LocalWeather&prodgrp=NEXRADimagery&product=RadialVelocity&prodnav=none