Narrator: Dr. Peter Mason (ironically enough, a geologist!)

        "Jackstraw was even more deeply concerned with the weather.  The temperature had been steadily rising for many hours now, the moaning ululation of the ice-cap wind, which had been absent for over two days, was increasing in intensity with every hour that passed, and the skies above were dark and heavy with black drifting clouds of snow.  And when, just after midnight, the wind speed passed fifteen miles an hour, the wind began to pick up the drift off the ice cap.
        I knew what Jackstraw was afraid of, though I myself had never experienced it.  I had heard of the katabatic winds of Greenland, the equivalent of the feared Alaskan williwaws.  When great masses of air in the heart of the plateau were cooled, as they had been in the past fortyeight hours, by extremely low temperatures, they were set in motion by a gradient wind and cascaded - there was no other word for it - downwards from the edge of the plateau through suitable drainage channels.  Set in motion through their own sheer weight of cold air, these gravity or drainage winds, slowly warmed by the friction and compression of their descent, could reach a hurricane force of destructive violence in which nothing could live."