In the Earth's atmosphere near the surface, the lapse rate for dry adiabatic lifting is about 9.8 K / km, and the lapse rate of the dew point is about 1.8 K / km ( it varies from about 1.6-1.9 K / km ).
22.
The air crossing over the lake by the evening of November 17 was at 850 hectopascals at the eastern end of the lake and even colder at its western end; this lapse rate was nearly double that of the dry adiabatic lapse rate and resulted in a very unstable atmosphere at the lower levels . before reverting to the same synoptic setup as before.
23.
Dry "'microbursts "', produced by high based thunderstorms that generate little to no surface rainfall, occur in environments characterized by a thermodynamic profile exhibiting an inverted-V at thermal and moisture profile, as viewed on a High Plains of the United States ) of a dry microburst environment that comprised three important variables : mid-level moisture, a deep and dry adiabatic lapse rate in the sub-cloud layer, and low surface relative humidity.
