Aviation Digital Data Service (ADDS)

Output produced by METARs form (1558 UTC 16 April 2014)
found at http://aviationweather.gov/adds/metars/
 
KIAD 161507Z 1615/1718 36014G22KT P6SM FEW250 
     FM162000 03010KT P6SM SKC 
     FM162300 05006KT P6SM SKC 
     FM171400 09010KT P6SM SCT250