Aviation Digital Data Service (ADDS)

Output produced by METARs form (0955 UTC 28 May 2015)
found at http://www.aviationweather.gov/adds/metars/
 
KSFO 280906Z 2809/2912 28009KT P6SM OVC006 
     FM281000 26006KT P6SM FEW004 OVC006 
     FM281600 25010KT P6SM BKN010 OVC020 
     FM281900 30014G20KT P6SM FEW010 SCT020 
     FM290300 29012KT P6SM BKN012