Here in Texas, exposed as we are to tropical fronts and Northern ones alternately, the weather can change with cinematic abruptness, and does. In fall and winter the temperature may plunge 40+ degrees in a day when a cold front of the kind Texans call a Blue Norther blows through, frequently accompanied by all kinds of meteorological melodrama--tornadoes, hailstorms, and the like--but thankfully disposing of the steamy tropical fug and sweeping clean the skies. Then, for a couple of days, before the first mellow outliers of the tropics start creeping back like jungle vines, we enjoy brisk temperatures, dry air, and a sky of intoxicating, burnished blue, like the ceiling of the Sainte Chapelle stretching into infinity, or a child's dream of Heaven. Or Philip Larkin's.

               Rather than words comes the thought of high windows;

              The sun-comprehending glass,

              And beyond it, the deep blue air, that shows

              Nothing, and is nowhere, and is endless.

                   (From High Windows, by Philip Larkin.)