Aviation Digital Data Service (ADDS)

Output produced by METARs form (1811 UTC 18 April 2014)
found at http://aviationweather.gov/adds/metars/
 
KDCA 181729Z 1818/1918 12005KT P6SM SCT030 BKN250 
     FM190300 00000KT P6SM OVC130 
     FM191300 35006KT P6SM BKN250 
     FM191500 02010KT P6SM BKN250