Aviation Digital Data Service (ADDS)

Output produced by METARs form (1845 UTC 21 November 2014)
found at http://www.aviationweather.gov/adds/metars/
 
KDCA 211736Z 2118/2218 29016G24KT P6SM FEW060 
     FM212100 31010KT P6SM SKC 
     FM212300 31006KT P6SM SKC 
     FM221500 20007KT P6SM FEW250