Eric Carroll pointed out this NOAA News Online Story where they have published NOAA and AFWA (Air Force Weather Agency) images from the DMSP (Defense Meteorological Satellite Program). The difference is pretty striking:

Before:

After:

Toronto, Ottawa, Buffalo and Rochester have all clearly vanished, while Montreal continues to shine brightly…

(Image Credit: NOAA/DMSP. More are available from the NOAA page).