UPDATE (Sat. 09/18/10): It has now been confirmed. Two tornadoes hit NYC during the storm - one in Brooklyn near the Brooklyn Bowl were we were preparing for the Millennium Network Event, the other in Queens.
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Yesterday I was in Brooklyn when this HUGE storm passed through. It started with lightning every 10 seconds, then suddenly a downpour - seriously heaviest rain I have ever been in (well luckily I was inside preparing for the Millennium Event, but everybody went to the door to look at the crazy weather!). Then the wind picked up, hail the size of ping-pong balls started crashing down, and the rain became so intense that you could hardly see out the door! The street turned into a raging river (I read that there was 2 inches - more in some areas - of rain in the short 10-20 minute period). The wind roared up to 110 mph and apparently a tornado touched down nearby. I captured some video, but it is not nearly as hilarious as this video of two guys freaking out in Brooklyn!