Winter Weather Advisory in Effect for Eastern Vermont 7 PM Tonight Through 10 AM Friday

A Winter Weather Advisory is in effect from 7 PM tonight to 10 AM Friday for portions of eastern Vermont. Freezing rain is expected in these areas, especially above 1000 feet elevation. Slick travel conditions are possible, so be sure to slow down and use caution if traveling this evening into Friday morning. Read More >

Surface to 1km Lapse Rate

A lapse rate is the rate of temperature change with height. The faster the temperature decreases with height, the "steeper" the lapse rate and the more unstable the atmosphere becomes. Values less than 5.5-6.0 degrees C/km represent stable conditions, while values near 9.5 degrees C/km are considered unstable. Between these values, lapse rates are considered conditionally unstable, meaning that it may become unstable if enough moisture is present. For more information on lapse rates, please click here.

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