The METAR I want to read is this:

METAR EDDH 300720Z 22019G31KT 8000 -RA FEW009 BKN011 09/07 Q1003 WS R23 TEMPO BKN015

But when I try to do so, I get the following exception:

metar.Metar.ParserError: Unparsed groups in body: 'WS R23'

I do not use METARs frequently so I checked the manual which said that the code means "Wind shear in the lower layers". Actually I am not interested in the wind shears at all but if there is an exception I need to deal with it somehow.