That the storm gathered strength in the Gulf over the weekend and hit the coast early on Monday could also have limited trading activity--there might have been more trading had the storm gathered strength and remained headed in an uncertain direction during trading hours.

FORBES: Catastrophe Bonds

West Bengal's Fisheries Minister Kiranmoy Nanda told the BBC that at least 60 trawlers had been out at sea when the storm picked up strength in the Bay of Bengal.

BBC: Cyclone hits Bay of Bengal

Forecasters can predict the speed a solar storm travels and its strength, but the north-south orientation is the wild card.

WSJ: Solar Flare: Sun Flare Leads to Solar Storm Reaching Earth