Forecasting of Air Stability Depending on the Potential Temperature

Osama T. Al-Taai, Zainab S. Muhammad


The Stability is one of the most important subject that have an effect on weather conditions where when the atmosphere is stable, the surface of the earth cools, especially during the clear nights and when the atmosphere is unstable, the surface is heated. The aim of thesis is to classify the clouds according to the atmospheric stability and the accompanying air conditions and determine the type of clouds formed in the case of stability and instability. Data were taken by temperature, dew point, atmospheric pressure and height from satellites recorded by the European Centre for Medium-Range Weather Forecasts (ECMWF) for height (32-26509.7) meter the levels of pressure (1000-20) mb, the choice of the characteristic day (15/1, 16/2, 17/3, 15/4, 15/5, 15/6, 15/7, 15/8, 15/9, 15/10, 15/11, 15/12) of the month of 2015 for the Baghdad station to obtain the largest possible number and variety of clouds and their use in the calculation of cloud cover and weather stability in terms of calculation daily change, monthly and seasonally variation of temperature and dew point, calculation of cloud cover with height, potential temperature, and atmospheric stability. The temperature change, dew point, cloud base and height were determined, and then the thickness, type and classification of the cloud were calculated. The potential temperature was also calculated with height to determine the type of air stability, as well as the calculation of atmospheric stability with the height of the cloud base and under the cloud base where the atmosphere is stable, unstable or neutral.


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