With fall underway, leaves across the country are coming into senescence, creating a vibrant landscape of reds, browns, oranges and yellows.
Entering the first week of October, much of the East has already seen slight to moderate color change. Some areas farther North, have begun to enter the peak of their season.
"It looks pretty certain that the cold temps in September brought out early and good color to the Northeast, including Pennsylvania," Marc Abrams, professor of Forest Ecology and Physiology at Penn State University, said.
"The August drought and early frosts (in places) is a slight negative, but overall the cold temps prevailed," Abrams said.
Temperatures from September through mid-October have a significant impact on the vibrance of the displays. Cold temperatures become very important during this time, what Abrams considers the "critical period."
"The warm temps this week may delay the trees that have not yet turned but shouldn't deter the ones that have," Abrams said.
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Tropical Depression Two has formed in the Atlantic and could become the next tropical storm of the season by midweek.
Warm and humid air in place over much of the Midwest and Northeast at midweek will contribute to the risk of drenching, gusty and locally severe thunderstorms on Wednesday.
After temperatures briefly climb to typical midsummer levels, another cooldown will roll into the Midwest and expand to the East for the last part of July.
Severe storms will fire up Tuesday afternoon and evening, threatening outdoor activities and travel for many.
Powerful winds, heavy rainfall and dangerous mudslides will threaten Taiwan on Wednesday as Matmo moves across the island.
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Heat wave continues; Ft. Worth, Waco and Wichita Falls all over 100 degrees for the 30th consecutive day. El Paso had its 40th consecutive day of 100 degree plus heat.
Barrow, Alaska (1989)
Thunder reported for the first time since July 1982 (no rain fell with this so-called storm) July 1989 did go on to become the wettest July on record with more than 3 inches of rain.
Thompson, Manitoba (1990)
97 degrees -- record heat wave.