Right now they have a link right above the radar map. I believe it says zoom in. There is also a menu bar at the top of the screen.  Under Radar it has "Radar" and "Regional Radar."  The Regional Radar is the love.  Especially in thunderstorm season.  Haven't gotten any runs out of it yet but it will rain again.

Don't forget to poke around Historic as well.  I find the Daily Precipitation to be invaluable.

Enjoy

Phil Malatin