All planes were grounded due to severe thunderstorms in the northeast . We were told that no planes were able to arrive or depart. A very short time later we were boarded on the plane and waited to take off for 3 hours. We were not given clearance and were sent back to the gate. The condensation from the air conditioner also poured out from the overhead into my seat and all over my legs. We finally boarded the plane again, a while later, but still had to wait another hour on the plane before take off. I arrived at my destination 5 hours later than the originally scheduled time.