Aviation Digital Data Service (ADDS)

Output produced by METARs form (0322 UTC 18 April 2015)
found at http://aviationweather.gov/adds/metars/
 
KIAD 172340Z 1800/1906 25006KT P6SM BKN050 BKN200 
     FM180600 32005KT P6SM SCT150 
     FM190400 01009KT P6SM SKC