Alrighty, well my calls were never returned and all my searches came up dry. The more I look though, the more I'm convinced the I at least know the right week. Trouble is, that week was INSANE. Severe storms were being fired at the Northeast as if from a tommy gun.
The month was July, and my best guess was the 8th, based on the earliest TWC recordings I could find.
First I found this recording of an old weather broadcast, which features a strong front that passed through the area on the night of the 5th and dumped record rainfall.
And now I found amateur footage of a thunderstorm that hit NYC on the night of the 7th.
And finally, in the comments beneath that footage, a Northeast tornado outbreak on the 10th is mentioned that also caused some ruckus in the Manhattan area (though that date comes later than my oldest recording).
That's the best I've got. Looking at observations from those dates can't clarify this any further since nobody ever bothered to take note of lightning intensity.