Some relevant data:
Having traveled that portion of the ICW many times, I can assure you the captain had no maneuvering room. The ICW east of Mobile is actually a canal (land cut), probably less than 50 yards wide, heading east-west. Those storms roared in from the NE, and to head into them, you would have hit the bank in less than two boat lengths. Much of the canal is lined with riprap, so hitting the bank would not have been pleasant.
Having said that, the storms started firing up shortly after midnight, and the entire area was under a severe thunderstorm warning all morning as the storm front marched to the SW. A prudent captain should have never entered the canal with a sail up under those conditions. If fact, I'm surprised he was even underway, as the storm produced continuous lightning, and you could hear it coming for hours due to the constant rolling thunder. A quick check of the VHF would have notified him of the danger. There are several large bays east of the canal that would have been a good place to anchor and ride out the passing storm front. It sounds like a case of "we have a schedule to adhere to" which overrode prudent boat handling.
Having said that, I fully acknowledge that I wasn't there, and don't know, and thus give the captain the benefit of the doubt. Thanks to the original poster for sharing this info, because I've learned from it, and will be more cautious in the future when entering that stretch of the ICW. We're headed that way in a couple of weeks, and again next month, as we have tickets to concerts at The Wharf Ampitheater, which is along that stretch of canal.
BTW, that same storm produced winds of over 60mph in our marina. We had sailed home under clear skies the afternoon before, and intended to head back out the next evening. We therefore left the dinghy with outboard attached in the water, something we never do, because it's a pain in the ass to haul it all on deck, especially for one night. Received a call from the marina about 11:30 the next morning informing me that our dinghy had been flipped, and our motor was underwater. I now know exactly how to restore a submerged four stroke. Lesson learned.