Storms forecast Friday as Lollapalooza 2013 kicks off in Grant Park

Music fans headed to Lollapalooza Friday afternoon should make sure to pack a raincoat or umbrella. The National Weather Service is predicting a high of 81 degrees Friday with a 50 percent chance of thunderstorms.

Meteorologist Jamie Enderlen said the humidity indicates the storms could impact the downtown area Friday afternoon before moving further south at night.

The temperature is only expected to reach 78 degrees with a 20 percent chance of thunderstorms Saturday and 75 degrees and sunny Sunday, according to the weather service.

And yes, you can bring umbrellas to Lollapalooza:

Lollapalooza and the City of Chicago have revised the storm safety policy after coming under criticism in 2012 when storms storms blew through the festival forcing a hurried evacuation of the grounds.

You can follow the live forecast and radar here. And stay tuned to the Lolla live blog for updates on weather alerts and all other news from the festival through the weekend.