6000 feet MSL
Exp. When lifted, unsaturated air cools at approximately 5.4 F per 1,000 feet. The dew point cools at approximately 1F per 1000feet. Therefore, the convergence of the temperature and dew point lapse rates is 4.4F per 1000feet. The base of the cloud that is formed by vertical currents can be can be calculated by dividing the difference between the surface temp and the dew point by 4.4 and mult the rounded result by 1,000.