Weather
Kentucky Winter Weather: How 1 Inch of Water Can Become 20 of Snow
Louisville, KY – Winter storms across Kentucky can produce dramatically different snowfall totals,&…
By Blake Harrison · 2026-11-10T07:35:03.409Z
Louisville, KY – Winter storms across Kentucky can produce dramatically different snowfall totals, even when communities receive nearly identical amounts of moisture. From Louisville to Lexington, 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 describes 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, actual snowfall ratios can vary considerably.
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 moisture.
Louisville and Lexington: Why Snowfall Can Differ
Louisville's location along the Ohio River can experience winter temperature patterns that differ from those farther east.
Lexington, situated in Kentucky's Bluegrass region, may encounter different temperatures and precipitation types depending on a storm's track.
A small temperature difference can determine whether precipitation falls as rain, sleet, freezing rain or snow.
Farther east, Kentucky's Appalachian Mountains add another factor. Higher elevations can experience colder conditions and additional precipitation when moist air rises over mountainous terrain.
However, elevation alone does not guarantee heavier snowfall.
What Kentucky Residents Should Know
Wet snow can weigh heavily on trees and power lines, increasing the potential for damage and outages.
Fluffier snow can accumulate more deeply and reduce visibility when winds strengthen.
Freezing rain is another concern in Kentucky, where significant ice can develop even when snowfall totals remain low.
Travel conditions can change quickly along Interstate 64, Interstate 65 and Interstate 75, particularly when temperatures hover near freezing.
Understanding snow to liquid ratios helps explain why snowfall forecasts can change despite similar expected moisture amounts.
For Kentucky residents, snowfall depth depends on more than precipitation alone. Temperature, storm tracks, elevation and snow density can dramatically influence final totals.