At 0700Z (start of the TAF) the warm front is approaching giving a SW wind, overcast conditions and light rain.  

As the front gets closer (BECMG 0810) the cloud base gets lower, the visibility decreases and the rain becomes moderate.  

Temporarily the cloud will thicken and the rain becomes heavy.  

Between 1200Z and 1500Z the warm front will go through; the visibility increases and the cloud breaks up in the warm sector.