Сool air offshore was very nearly at the saturation point, with a temperature near 20 degrees C and a dew point of about 19.5 degrees C. The air at this temperature can only hold a certain amount of water vapor, and how much it can hold depends heavily on the temperature.

Russia-backed rebels pose by a road sign at the entrance in Debaltseve, Ukraine, Friday, Feb. 20, 2015, after checking the access road into town for mines left behind by retreating Ukrainian government troops. After weeks of relentless fighting, the embattled Ukrainian rail hub of Debaltseve fell Wednesday to Russia-backed separatists, who hoisted a flag in triumph over the town. The Ukrainian president confirmed that he had ordered troops to pull out and the rebels reported taking hundreds of soldiers captive. (AP Photo/Vadim Ghirda)