In reply to:
It isn’t that unusual for Las Vegas to catch several convective days every summer when the monsoonal crud from Arizona and New Mexico gets a tug from the thermal low over the deserts or a shove from the Four Corners high.
Gordon: I think we have a difference in magnitude. It appears that Las Vegas averages less than 1/2" of rain in August or any other month for that matter, with only 3 days of rain, per month. I checked the Washington Post historical WX http://www.washingtonpost.com/wp-srv/weather/longterm/historical/data/las_vegas_nev.htminfo and Vegas gets an average of just over 4 inches per year.
While I was there, it rained on three days. One part of town received over three inches on just opne of those days. You may recall watching national TV about 3 weeks ago and seeing the fire department being rescued from the flood waters by helicopter. As far as scale is concerned, the media claimed the rain that day was bigger than the last ‘100 year’ flood which occurred 3 or four years ago, I would consider the event a little bigger than average.
Here is a link to the story in the local paper
Of course, maybe it’s just me: I was also in Detroit for the blackout.