As the day advanced it grew sultry, with a menace of clouds to the west. After a time the great peaks were lost in dark clouds, and distant thunder boomed. A lance of lightning rent the nearer sky, and flashed its vivid whiteness into the gorge. This had narrowed so that between the steep hills there was only room for the arroyo and the little roadway beside it. Before the rain began to fall on Lola's bare head, as it did shortly in sheets, the stream-bed had become a raging torrent, down which froth and spume and uprooted saplings were spinning.