Aviation Digital Data Service (ADDS)

Output produced by METARs form (0751 UTC 30 August 2015)
found at http://aviationweather.gov/adds/metars/
 
KIAD 300534Z 3006/3112 19008KT P6SM SCT080 
     FM301100 21004KT P6SM SCT070 
     FM302000 21006KT P6SM BKN200