PITTSBURGH — The fall season began with warm temperatures, but early signs of fall are visible in Pittsburgh. Changing seasons don't always mean a distinct change in the weather.
We had near-record warmth and two weeks of temperatures in the 80s before a shot of cool, fall-like weather moved in. That's great for fall festivals, but allergy season is still hanging on.
Warm weather pollen producers are most active from August to November, and the warm weather trend means they could last longer.
Ragween can release up to one million grains of pollen a day, so doctors suggest limiting time outdoors during the morning.
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Cooler temps through the month will mean the return of fall colors. Drone 11 went into the air to see the first signs of fall as the trees begin to change color. Reds and yellows are visible already.
With more than 100 types of trees and shrubs that change color, and a change in elevation, Western Pennsylvania is set to have one of the best fall color shows in the world.
As the days grow shorter and temperatures fall, leaves stop making chlorophyll and brighter colors start to show.
Western Pennsylvania typically sees its first frost around October 20th, so break out the fall wardrobe and get the furnace checked now.
Pittsburgh's Chief Meteorologist Stephen Cropper predicts we'll see snow mixed in by mid-October too. Our average is about a half inch for the month - and in the past, we've seen it as early as October 18th.
In case you forgot: in 1993, more than a half foot of snow fell during the "Halloween snow."
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