Abstract
TIROS I satellite pictures for a 3-day period about, a developing “Low system” over the central United States are shown. Cloud distribution about surface fronts and upper-air troughs was examined and compared to the “ideal” (classical) distribution. The pictures and analyses reveal that cloud patterns were significantly changed by strong subsidence and advection of dry air along a low-level wind maximum. The cloud patterns when compared to the 600-mb. vertical motions computed routinely by the Joint Numerical Weather Prediction Unit showed only partial agreement. A strong relationship between low cloud cover and surface relative humidity was found; this relationship may be useful under certain conditions in determining the stability of the air over areas where upper-air data are sparse.
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