Because horse racing is a sport that takes place out doors, it is subject to the weather and all the variations of weather we get here in the US. It may be torrential rains in the South or Blizzards in the North or any combination of weather in between. This presents a real challenge to horse racing handicappers who have to figure out how to handicap a race on an off track. The advice you used to get from the handicapping experts was to stay home and work on your stamp collection when the weather is nasty and the track is listed as good, muddy, sloppy, or even wet-fast.