The first tornado was an EF0, the weakest classification of tornado. Another tornado touched down later, a slightly stronger EF1. The second tornado killed a 30-year-old woman when it dropped a tree on the car she was in. Luckily, she was the only person killed in the storm.
The most damage was caused by the macroburst, a large downward burst of wind from the storm. These winds reached up to 125mph.
Hundreds, possibly thousands of trees were uprooted by the storm. 37,000 people lost power, at least six houses had roofs torn off, and transportation was widely disrupted.
Source:
http://www.lohud.com/article/20100918/NEWS05/100918002/-1/newsfront/Authorities--2-tornadoes-struck-NYC-during-storm-
Here you can see a video two young, foul-mouthed residents took during the storm. You can see the massive wall of rain approaching, and at one point they appear to be filming the macroburst (despite their repeated insistence they're in a tornado).
https://www.youtube.com/watch?v=lCE_qiy-sOQ