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Tennessee Snow: Why 20 Inches Can Start With Just 1 Inch
Nashville, TN – Winter storms across Tennessee can produce dramatically different snowfall totals, even when communities receive nearly identical amounts of moisture. From Nashville to Knoxville, just
By Paige Sullivan · 2026-11-10T07:35:08.083Z
Nashville, TN – Winter storms across Tennessee can produce dramatically different snowfall totals, even when communities receive nearly identical amounts of moisture. From Nashville to Knoxville, just 1 inch of liquid precipitation can sometimes produce 5 inches of heavy, wet snow or as much as 20 inches of lighter, fluffier snow.
The difference comes down to the snow to liquid ratio, which measures how much snow accumulates from a given amount of liquid water.
Why One Inch Can Produce 20 Inches of Snow
A commonly used forecasting guideline is the 10 to 1 ratio, meaning 1 inch of liquid water produces approximately 10 inches of snow.
However, snowfall does not always follow that formula.
Heavy, wet snow may have a ratio near 5 to 1, producing approximately 5 inches from 1 inch of liquid precipitation.
Under colder atmospheric conditions favorable for fluffy snow, ratios can sometimes reach 20 to 1, producing approximately 20 inches from the same amount of moisture.
Nashville and Knoxville: Why Snowfall Can Differ
Nashville's location in Middle Tennessee can expose the city to rapidly changing winter temperatures, particularly when warmer air moves north ahead of a storm.
Knoxville, located in East Tennessee near the Great Smoky Mountains, experiences additional influences from surrounding terrain.
Higher elevations in the Smokies can remain colder and receive accumulating snow while lower valleys experience rain or mixed precipitation.
However, Knoxville itself does not automatically receive the same snowfall as nearby mountain communities.
Storm tracks, elevation and temperatures throughout the atmosphere determine whether precipitation reaches the ground as rain, sleet, freezing rain or snow.
What Tennessee Residents Should Know
Heavy, wet snow can weigh down trees and power lines, increasing the potential for damage and outages.
Lighter snow can accumulate more deeply and reduce visibility when winds strengthen.
Freezing rain is another significant winter concern in Tennessee, where dangerous ice can develop even when snowfall totals remain low.
Travel conditions can change quickly along Interstate 24, Interstate 40 and Interstate 75, particularly in mountainous areas and where temperatures hover near freezing.
Understanding snow to liquid ratios helps explain why snowfall forecasts can change even when expected precipitation amounts remain similar.
For Tennessee residents, snow depth depends on more than moisture alone. Temperature, storm tracks, elevation and snow density all influence final accumulations.