This summer it has been common for there to be thunderstorms, often with severe weather, in this area on one of the two days of nearly every weekend since Memorial Day. Plus, conventional wisdom is that it always rains on weekends. Yet, statistically there is not an increase in rain during weekends; in fact, just the opposite may be true.
A recent paper published in the Journal of Geophysical Research found evidence that in the United States during the summertime, tornado and hailstorm activity peaks during the workweek in the same time frame that atmospheric aerosols (think manmade pollution) peak. It is thought that this increase in particulates in the air invigorate thunderstorm activity. According to this study, Saturday and Sundays have the lowest probability of severe weather of all the days of summer.
The study looked at data between 1995 and 2009. Perhaps if the summer of 2011, at least in our area was included in this study, it may have skewed the data toward the weekends just a bit.