Wow! Great write up.
I think I know just how you felt during the storm. On a trip down the Tenn-Tom waterway, I was anchored in a slough off the main river channel.
That evening, I was hit by a huge storm system with a tornado crossing the slough just north of my Cheoy Lee 31 ketch.
The boat was knocked down flat several times, as I lay on the floor. Pots, pans and cans of food became lethal projectiles. I crawled to the hatch and looked out at the anchor line to see if it was holding. The water was blowing everywhere in a real white squall.
The 5/8" nylon rode was stretched so tight, it only looked like a 3/8" rode. The boat did a 360 around the anchor during the storm, but the Danforth 22# anchor held. I had to power the anchor out of the mud, and the shank was bent 90 degrees.
I got off really lucky. Several people in Alabama where killed in that storm. All I had was a bent anchor and a cracked port light.