Aviation Digital Data Service (ADDS)

Output produced by METARs form (2013 UTC 18 December 2014)
found at http://aviationweather.gov/adds/metars/
 
KPWM 182003Z 1820/1918 30013G23KT P6SM SCT050 BKN080 
     FM182300 33005KT P6SM SCT250