These are quite active cumulus bubbling up while I was paddling around Red Horse Lake. A vigorous updraft will form knuckles around the upper edge encircling the updraft. Strong vorticity curls driven the the wind of the updraft, draw the moisture outward once the level of the inversion is reached. The prevailing wind direction was northerly and the inversion was probably the result of subsidence ahead of the approaching ridge of high pressure. These cumulus clouds had reached their vertical limit at the subsidence inversion even though the updraft was vigorous. The cold air ass in the wake of a system which had passed through the day before, is typically unstable in the low levels. A simple observation of the characteristics of the clouds can reveal much about the past present and future weather.http://fineartamerica.com/featured/red-horse-castles-phil-chadwick.html
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