Sentence:  Thus in a context in which there has been discussion of snow but mention of local conditions is new , dominant stress will probably be on here in it rarely snows here , but in a context in which there has been discussion of local weather but no mention of <WSD>snow</WSD> , dominant stress will probably be on snows . 
Meaning of the word marked with <WSD> tags:  precipitation falling from clouds in the form of ice crystals