Due to water vapor in an atmosphere that changes temperature and pressure with altitude. As water-bearing air rises into regions in which the temperature and pressure pushes it pas its dew point, the water condenses, most often around dust particles, forming droplets. Billions of droplets form clouds. I do not see what bearing that has on back-radiation
From Mr Wikipedia, emphasis mine:
A pressure system is a relative peak or lull in the
sea level pressure distribution. The surface pressure at sea level varies minimally, with the lowest value measured 870.0 hectopascals (25.69 inHg) and the highest recorded 1,085.7 hectopascals (32.06 inHg). High- and low-pressure systems evolve due to interactions of temperature differentials in the atmosphere, temperature differences between the atmosphere and water within oceans and lakes, the influence of upper-level disturbances,[
jargon] as well
as the amount of solar heating or radiational cooling an area receives. Pressure systems cause
weather experienced locally. Low-pressure systems are associated with clouds and precipitation that minimize temperature changes through the day, whereas high-pressure systems normally associated with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day. Pressure systems are analyzed by those in the field of
meteorology within
surface weather maps.
Please explain your point. For starters, if the Earth's atmosphere is not absorbing and re-radiating energy, what prevents the Earth from being at its black body temperature of -18C/0F? Alternatively, if you believe it absorbs but does not radiate, what prevents it from being the same temperature as the surface of the photosphere?