Yea man. This is summertime. Fricken storms just pop out of NOWHERE... I live and die by the Doppler radar app on my cell phone when riding.
Normally you can see a rain front coming towards you, usually moving from the west. But now... you can be staring at your Doppler app and time lapse shows a huge thunderstorm just appearing out of nowhere, RIGHT ON TOP of you.
I use the paid version of My Radar Pro on my IOS devices. We also use it at BWI to forecast weather when planning for deicing operations with aircraft (along with WeatherUndergound)... better than METAR sometimes...