Pumpkin patches and haunted hayrides are starting to appear across the country as late summer transitions to early autumn, but with the changing of the seasons comes a hidden danger. Autumn allergy season is nearing its peak in the United States, and AccuWeather forecasters say it could be a bad one for allergy sufferers in more than a dozen states. (Getty Images) Many areas east of the Mississippi River are forecast to have high ragweed pollen levels this fall, but there is some good news for p