After he ended his service, he enrolled at what was then the top climatological school in the country, the University of Chicago, and studied under legendary meteorologist Herbert Riehl.
What helped cinch Gray's career choice was a flight in a B-50 through the 125-knot winds of Hurricane Helene off the east coast of Florida in 1958, skimming low enough to see the titanic waves kicked up by the storm. "Take a young graduate student, fly him into waves and he gets excited," Gray said.
Riehl was lured by Colorado State in 1960 to found a climatology department, and he brought Gray to the quiet college town where the high plains butt up against the mountains. The two created a world-renowned graduate program that cranked out a number of tropical storm specialists.
After 20 years of studying tropical cyclones Gray carved out the niche that made him famous -- at least for an academic forecaster.
The head of the National Hurricane Center had bemoaned the inability to predict the severity of the next hurricane season. Gray started puzzling through the basic storm theory he had been teaching for decades and wondered if there was a way to look at atmospheric factors and extrapolate what might happen in the months ahead.
His first forecast was a sensation. "Anyone who could say anything about the coming season, that was big stuff," Gray said.
Now several scientists and institutions formally predict the coming season, including the National Hurricane Center, where two of Gray's students work on the forecast. Gray's own forecasts begin in December, predicting storm activity nearly nine months in advance. He refines them as more data comes in, tweaking his prognostications through the summer hurricane season.
In December 2004, Gray predicted that the 2005 hurricane season would see 11 storms strong enough to earn names. As he watched the weather patterns grow increasingly violent, he steadily increased his predictions. By August, he had upped the forecast to 20. Twenty-eight were ultimately recorded for the season.
This year, Gray is scaling back on forecasting. As an emeritus professor, he has no teaching responsibilities, but he is handing off prime authorship of the forecast to a graduate student, Philip J. Klotzbach, and is turning his energies toward trying to refute global warming.
Like many hurricane forecasters, Gray rejects the theory that the recent uptick in storms is due to climate change. He points out that the U.S. had an unusually low number of storms from the 1970s to the end of the century and says the law of averages is simply catching up. But he goes further and dismisses the view -- accepted as fact by most scientists -- that recent warmer temperatures are caused by man-made greenhouse gases.
"It's one of the greatest hoaxes ever," Gray says of global warming, theorizing that it's an alarmist hypothesis made to snare research dollars. Gray believes that climbing temperatures are caused by cyclical warming in the oceans, and that the globe will cool down again in the next 10 to 15 years.
Klotzbach, Gray's coauthor on the forecast, says his mentor's underdog position in the global warming debate is typical. "He's not one to just go along with the crowd," Klotzbach said.
