Some portions of the Northeast have a chance at vibrant fall foliage based on forecast weather, while drought-stricken parts of the country may not have much of a display.
Warm and wet weather through the remainder of September and into the first couple of weeks of October would not be good news for leaf-peepers in the Northeast, according to Dr. Marc Abrams, a professor of Forest Ecology and Physiology at Penn State. Abrams began observing how weather conditions affect fall foliage 25 years ago.
A late and muted peak in fall colors would be expected if warmth continues into the second week of October.
Instead, Abrams added, ideal weather for a colorful fall would be drier weather through the remainder of September with colder temperatures, dipping into the 30s at night.
"A frost helps to bring out the color. What happens is that the chlorophyll - which causes the green color of leaves - starts to break down. This basically exposes the other pigments like red and orange," Abrams said. On the other hand, persistent warm and wet weather would extend the growing season, causing leaves to stay green.
A frost and freeze is most likely for upstate New York and north-central portions of New England during late September, according to AccuWeather Lead Long-Range Forecaster Paul Pastelok. This region will have the best chance for a bright and colorful fall.
While nights can get cool farther south, temperatures are not predicted to get cold enough to produce a frost before October, Pastelok added. For the big cities along the I-95, including New York City to Washington, D.C., the central Appalachians and Ohio Valley, the mild weather may mean a late peak of fall foliage with subdued colors.
Typical peaks in fall foliage color across the U.S.
While warm, wet weather limits the bright color display of leaves, the opposite - abnormally dry conditions - can also have a negative impact. Drought conditions can impact the leaf size, vigor and physiology, and exceptional droughts can even kill trees.
Hard-hit drought areas of the Midwest and Plains, especially Iowa, Nebraska and Missouri, are probably not going to have a good display of fall foliage this year, Abrams said.
The red color on the U.S. Drought Monitor map shows extreme drought conditions, while the deep red shows exceptional drought conditions (the highest level of drought).
Extreme to exceptional drought conditions are gripping much of the nation's heartland.
Following a blustery and chilly weekend, temperatures will once again take a tumble across the northeastern United States during the first half of the week.
Dry weather set to dominate the southern United States into November will only worsen the already extreme drought conditions.
Several storms will bring periods of rain and gusty winds to the west coast of the United States this week.
The changing of the seasons will bring beneficial rainfall to northern Brazil, a region that has experienced severe drought over the past several years.
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Newbury, VT (1843)
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