Per steam engine from Grenada to Barbados?

This morning we decided to fly again to Ragged Point. After a first low level leg at 300 ft (ACTOS) we climbed up to 8000 ft for a vertical profile. Unfortunately, all clouds near the east coast disappeared, so we decided to go to our measurement area south of the island. Arriving there we performed horizontal legs at 4000 ft and 3000 ft and prompt some nice cumuli showed up. At 3000 ft ACTOS sampled lots of clouds with various cloud top heights and cloud base around 2000 ft. It was amazing to follow the fast development of these clouds from small frazzles to mature ones. The liquid water content reached maximum values around 1 g m-3 and the FastCPC recorded high fluctuations in the particle number concentration (interstitial) at cloud edges. In between some looked like smoke clouds from steam engines (see picture). Finally, we made a horizontal leg below cloud base at about 1500 ft on our way back to the Concorde Center.