YOu can see both low clouds and high clouds at night very well by having a look at the NWS 'fog-reflectivity' image here: http://www.wrh.noaa.gov/satellite/showsat.php?wfo=fgz&type=fog&size=2 ...where (at night) the low stuff is lighter grey, and the cirrus is dark. \Brian -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.