I guess the reporting stations at sea would have had to be ships. I don’t know how many ships would have been in the tropical storm zone continuously.
Seriously, I doubt that there was much reliable info on the storms. I recall that in the 1950s it was big news to have airplanes enter these storms to record pressures and wind speeds.
Seriously, I doubt that there was much reliable info on the storms. I recall that in the 1950s it was big news to have airplanes enter these storms to record pressures and wind speeds.'Up close and personal' is the only way to do it huh ...
So, unless it "bites the hand" of Western man it doesn't exist (IOW, we have not learned to read the signs at-a-distance) ...
As homework, I would suggest when the next hurricane approches the coast you closely observe the skies while the storm is still several hundred miles away ...
Bonus points: When was the telegraph invented and when was the first successful trans-Atlantic cable laid?
Methinks the whole world has forgotten just how big shipping, commerce, and shipping-insurance was back a century and more ago ...
England used to station ships permanently in the Atlantic for weather observation, but I think they were in the Northern shipping lanes - one of my uncles was on one.
I'm not sure if the US did the same, or if any were in the Tropical Atlantic. Does anyone know?
Google works again...
Pre-satellite observation locations - don't know about the thirties though... 
http://jproc.ca/rrp/wxship.html