David Hempleman-Adams launched from a site near Greeley this
Flight director Tim Cole tells the British Press Association
that Denver International Airport radar measured an altitude of
37,000 feet about two hours later. The previous balloon class
record of 34,740 feet was set in 1996.
A spokeswoman says Hempleman-Adams and Mears chose Colorado
because of the broad, open expanses in the state's eastern plains.
The balloon uses a combination of helium and hot air and is 140
Hempleman-Adams was wearing an oxygen mask and heavy clothing to prepare for temperatures of nearly 100 degrees below zero.