,%%%,
"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %%%%
,% %%%% ,%%%,
,%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
,%%%% %%%% %%%%"
%%%%% , %%%% , ,%%"
"%%" "%%%%%%%%% %%%% "%%%%%%% %%"
%%%%
, %%%% ,
"%%%%%%%%%%% %%%% "%%%%%%%%%%%
"%%"
,%%%,
"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
,%%%,
"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%" %%,
,%%" %%%,,
,%%" ,,,,,,,,,%%%%%%%%%%,,
%%%%%%%%%%%%%%%%%%%%%%"""" "%%%%%%,
"%%%%%%%%%%%""" "%%%%"
%%"""" "%%"
The bottom part was originally the entire character meaning cloud and it came from a squiggle representing billowing vapours, later stylized and then substitued with the character meaning to meet/speak with for ease of writing.
Later on, the character for rain was added to the top to emphasize the meaning of cloud.