Word: clouding
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...missing U.S. dead had vanished almost without a clue, lay scattered in remote and inaccessible regions from Manchuria to the hot forests of Thailand. The most dramatic example: the 879 men who had died in the wrecks of 468 different airplanes trying to fly the cloud-hung Himalayan Hump...
Thunderclouds-and the plane-racking turbulence that goes on inside them-are a constant menace to a pilot. He cannot always tell whether the cloud ahead is dangerous or not. Last week both the airlines and the U.S. Weather Bureau were peering into clouds with radar-which seems to be the way to spot a genuine thunderhead full of dreaded turbulence...
...American World Airways) received a routine message: the DC-4 was 30 minutes out, would soon ask for landing instructions. For several hours there was no more. Then came a message from upcountry. Thirty miles north of the field, Avianca's DC-4 nad crashed into the vertical, cloud-shrouded face of Mt. Tablazo. a 9,000-foot peak in the Sierra Sabana range. Then it fell flaming, 1,000 feet into the ravine below. The DC-4's 53 were dead, in the worst crash in airline history...
Stop the Fog. But dry ice and popgun explosions are shortlived instruments. What G.E. snowmen wanted was something that would hang around in the air waiting for a supercooled cloud. They discovered in the laboratory that snowflakes form more readily if they have something like ice to crystallize on. So they tossed all sorts of powdered substances into the fog in their laboratory "cold chamber." Silver iodide did the trick magnificently, turning the fog to snow. Silver iodide crystals are hexagonal, as snow crystals are. Apparently snowflakes recognize the kinship and are fooled into hanging on. An infinitesimal whiff...
...country. Hail is formed when raindrops are sucked into rising currents in a thundercloud. They freeze high in the air, collide with supercooled water droplets, and grow into crop-slashing hailstones. Dr. Irving Langmuir proposes to charge the thunder-threatening air with silver iodide particles. Sucked up into the cloud, they will turn the supercooled droplets into snow before they can build up hailstones...