NASA and Morton Thiokol officials took advantage of a break in Wednesday's inclement weather to test fire the redesigned space shuttle booster rocket near Promontory, Box Elder County, two hours earlier than originally scheduled. Early indications from Morton Thiokol's remote test site, 25 miles west of Brigham City, were that the test was a success. The 126-foot-long booster, filled with 1.1 million pounds of propellant, burned for two minutes amidst cheers from officials and spectators. Two remaining full-scale tests will be conducted before the space shuttle Discovery flies in August.