10. Imagine a parcel of air that has a temperature of 40°C at the surface and a dew-point temperature of 20°C at the lifting condensation level. Assume that the environmental lapse rate is 8°C per 1000 meters, the dry adiabatic lapse rate is 10°C per 1000 meters, and the wet adiabatic lapse rate is 6°C/1000 meters. In Table C, record the environmental temperature, the parcel temperature, and the temperature difference (parcel temperature minus the environmental temperature) and then determine whether the atmosphere is stable or unstable at each height. a. What is the height of the lifting condensation level? b. Does this example describe absolute stability, absolute instability, or conditional instability? c. Would you forecast thunderstorms under these conditions? TABLE Height Parcel Environmental Temperature Stable or (meters) Temperature oTemperature differenceunstable (Parcel 7000 6000 5000 4000 3000 2000 1000 Surface 40°C 40°C O°C Stable

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EXPERT ANSWER

see when air reaches its dew point then we have to switch on the wet adiabatic dry rate.

up to 2000m, the air is above dew point so we subtract dry adiabatic rate(10) however when it reaches dew point we start to subtract the wet rate(6).

answer1: 2000meter is height of condenstation lifting.

anser 2: its conditional instability since below 3000m the air is stable but above it , it is unstable.

answer3: yes, its forceful uplift in effect of cold front underiding the warm air so thunderstome may be possible.