About a year ago, I took this video along the Hudson river in NY, and I'm trying to figure out the Beaufort number based on the water and the flags.
The problem is that the Beaufort scale is based primarily on open sea waters (not protected/inland waters like the Hudson river). The only mention in the scale relating to inland waters is force 5 ("crested wavelets (whitecaps) form on inland waters") - but nothing related to the higher force numbers.
In this video, there are definitely lots of whitecaps, which leads me to believe that the wind was force 5 or higher. Possibly even a 6.
Flags are another indicator; but here it is kind of vague. At force 5, flags start rippling and flapping hard, and as the wind gets stronger, they start beating/snapping, until finally they are fully extended with only the very end flapping (force 7). So looking at the flag in the video makes me think it's a 6.
What steady force/speed is the wind really blowing here? What about gusts?