here's the scoop, and i'm talking about the west end. the last few years, the first flounders in jamaica bay have been taken in broad channel proper, between the yacht club and the train bridge. this year should be different.
traditionally, this 10-15 foot water would be too cold. early season action centered around 30-40 foot holes in the bay.
where ? the real silver hole, holes in the pumpkin patch, holes in the back bay by five towns, behind the back side of the rockaways, etc. look at a chart, find some deeper water with some current flow, chum like **** and you might catch a few.
my guess is that few will be caught opening day, good luck.