During some Winters, a band of clouds to the south becomes the predominant feature. Check out today's IR image. http://www.atmo.arizona.edu/gifs/IRAZ.GIF As of just before noon, the time-lapse animation shows very gradual motion of the entire thing to the north, so I'm not so sure anymore that it's going to be photometric tonight as you head into the southern part of the state. This one shows just how far the subtropical jet clouds extend to the west. http://weather.unisys.com/satellite/sat_ir_west.html Tom -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.