PORTLAND -- Have you ever wondered about the science behind why leaves change color and eventually fall from their branches?
Weather factors such as sunlight, precipitation and soil moisture influence fall color arrival, duration and vibrancy.
According to the United States National Arboretum, a wet growing season, followed by a dry autumn filled with sunny days and cool, frostless nights results in the brightest palette of fall colors. Changes in weather can speed up, slow down or change the arrival of fall's colorful foliage.
For example, drought conditions during late summer and early fall can trigger an early shutdown of trees as they prepare for winter. Leaves will fall early, never reaching full color.
Freezing temperatures and hard frosts can cause poor fall color and cause leaves to fall early in the season.
If you'd like to share your favorite colorful fall photos with KGW, you can add #KGWFall to any photos you post on Facebook or Instagram. Or you can submit them to kgw.com here: YourPics
To read more about the magic of fall color, go to: www.noaa.gov/features/02_monitoring/foliage.html
Meteorologist Rod Hill, follow me: