You saw one of two things on that radar.....
Either "ground clutter" caused by interferene around the radar satellites or possibly virga ( rain that evaporates before it hits the ground) which will show up on radar as light showers.
Wunderground is the best online weather site...inaccuraweather, Weather.com and others suck. NOAA is a close second to weather forecasts.
Fear not grasshopper....rain with a name is on the way