KGRB 030520Z 0306/0406 18007KT 4SM -SHRA OVC006 
  FM030700 21006KT 5SM BR OVC006 
  FM031100 25006KT P6SM BKN012 
  FM031400 26011G18KT P6SM SCT040 
  FM040100 24005KT P6SM SKC