The call to board sounded; the fresh air was cut off; there were reluctant shunting movements.
Once the flow of warm and moist air is cut off from thunderstorms and their associated tornadoes, normally by the thunderstorm's own rain-cooled outflow boundary, the storms begin to dissipate.
Pentagon officials have said the air campaign, now in its 19th day, has effectively destroyed the Taliban's arsenal of aircraft, surface-to-air missiles and air defenses, and cut off most of their communications.
The alveoli are where Benoit Mandelbrot with his supposed geometry of nature out of thin air decided to cut off his algorithm of growing things that look like the branching of a tree.
"It's cut off air and light, and eliminated a lot of open space.
It cut off air service and mail between the countries, closed the border and refused Georgian exports.
The Syrian army is advancing on all fronts, backed by Russian air strikes, and has cut off opposition forces in Aleppo.
Marie Claire Feghali, a spokeswoman for the International Committee of the Red Cross, said on Tuesday that the humanitarian situation across Yemen was "very difficult" with "naval, air and ground routes cut off".
Brooding on a windswept plateau enclosed by volcanic hills, it was described by D H Lawrence as "a sort of inland island," and has an air of being somewhat cut off from the rest of the region.
"Typically, fair-weather cumulus clouds dissipate a few hours after sunset because their lifeblood, the contrast of the warm ground and the cooler air aloft, has been cut off," he said.
