Winds Aloft
If this report doesn't appear current, check at the source links.
9900 means light and variable. Otherwise ddnn → dd0 → degrees azimuth and nn is speed in knots.
Vancouver (last aquired from flightplanning.navcanada.ca Saturday, Nov 28, 2009 3:05PM)
Vancouver BCfor use 30006000ft9000ft12000ft18000ft
281200 DATA VALID 28180017-21YVR20192527-022733-072843-113149-19
281200 DATA VALID 29000021-06YVR22112621-012825-062930-092946-18
281200 DATA VALID 29120006-17YVR25082715-012829-052843-082843-17
Seattle (last aquired from aviationweather.gov Sat Nov 28 15:05:01 PST 2009)
  Ft3000600090001200018000
Data updated: 28 Nov 1400 UTC
VALID 281800Z
17-21. SEA23232626-012824-062927-113246-19
Data updated: 28 Nov 1400 UTC
VALID 290000Z
21-06. SEA24292727+013022-043023-093134-18
Data updated: 28 Nov 1400 UTC
VALID 291200Z
06-17 SEA25153109+023219-033230-083030-18