What does it mean when a cloud is high?

I was just curious as to what it means when a cloud or clouds are really high in the sky.What does it mean when a cloud is high?
In the United States, any clouds with the base that are located at or above 20,000 feet above the surface are considered high clouds.



http://www.srh.noaa.gov/ohx/dad/ua/rrs/C鈥?/a>What does it mean when a cloud is high?
They are stoned.