11. A swift current of air at 5, 000 feet developed over western Florida when the sun set. 12. Within the storms, sinking currents of air transferred momentum from fast winds aloft toward the Earth's surface. 13. Tornadoes form when rising currents of air tilt these horizontal rolls into spinning, vertical columns of air. 14. With each current of air , the panels waft gently like sheets hanging on a clothesline in summer. 15. Subsiding currents of air behind the tropical system will squelch clouds across the southern Plains and Texas. 16. In spring, the rising currents of air that generate clouds are inhibited over the still chilly waters. 17. Upward currents of air support the weight of suspended particles and hold them indefinitely in the surrounding air. 18. When tropical skies are clear, forecasters use infrared images of water vapor to detect steering currents of air . 19. As the sun heats the ground, rising currents of air will generate puffy cumulus clouds across the region. 20. Underground however, brattices remained vitally important for directing the current of air throughout the whole of the colliery.
