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 Storm Neoguri has quickly weakened as it made landfall over Japan, but it still poses dangers to the nation with heavy rain and possible mudslides.
Days after Neoguri takes a curved path over Japan and into the northern Pacific, much cooler air will drive southeastward across the Midwest and into the Northeast.
Pockets of potentially flooding rain, hail, and unseasonably cool air will not be quick to leave central and eastern Europe.
Violent storms and tornadoes ransacked areas in the northeast on Tuesday, killing five.
Intense storms rolled through Arizona Tuesday night bringing flash flooding to areas of La Paz County.
Jefferson, IA (1955)
0.69 inches of rain in one minute.
A tornado tracked 17 miles through the Black Forest. Three people were killed and 1,780 homes were destroyed.
Plainview, TX (1979)
A total of 4.5 inches of hail reported (1 inch shy of U.S. record).