Aviation Digital Data Service (ADDS)

Output produced by METARs form (1605 UTC 29 March 2015)
found at http://aviationweather.gov/adds/metars/
 
KSLK 291120Z 2912/3012 00000KT P6SM SKC 
     FM291600 22008KT P6SM FEW250 
     FM300400 20010G16KT P6SM OVC120