In meteorology, an okta is a unit of measurement used to describe the amount of cloud cover at any given location such as a weather station. Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud, ranging from 0 oktas (completely clear sky) through to 8 oktas (completely overcast).
Isobars are lines on a weather map joining together places of equal atmospheric pressure.
On coloured weather maps, a warm front is drawn with a solid red line with red semicircles.
Symbol for rain is a black ball and the symbol for snow is a star, then you know sleet will be a ball plus a star, and two, three or four ***** denotes heavier rainstorms.