Most camera manuals say that the max sync speed when using a flash (the shortest shutter speed you can use and fully expose your cameras sensor) is around 1/200-1/250sec.
Have you ever actually tried shooting faster than 1/200sec with a flash? If you do chances are you will see this black area start to show up on the bottom of your cameras lcd screen (if you are shooting landscape orientation). The faster the shutter speed the more black area.
The trick is to keep this in mind when your shooting and incorporate that into the photo. Maybe you want to darken the foreground a little anyway, or if your really talented you can flip your camera upside down to get a dark gradient in the sky if your shooting outdoors.
Here is a link to the author of this video.