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Trending: when to see peak fall colors

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ROANOKE (WSLS 10) - Many people are eyeing the October calendar to pick the best weekend to view fall colors, and we're starting to see some changes.

Different years are known as good foliage years, and others aren't according to Virginia Tech tree physiology specialist John Seiler.

There are several factors including a storm which cause leaves to drop early.

Dry conditions make trees brown up faster. Reds develop in sunlight, when we have clear fall days.

Seiler also says the recent lack of rainfall could prevent better than average color.

Seiler says predicting fall color peak dates is an inexact science, it's impossible to plug in temperatures, rainfall, and tree species and get a time for peak viewing.