To match overlayed variables

Greetings,

I've tried to draw the overlayed variables as following attached figure.
But it look does not match exactly..

overlayed wind vector looks smaller area.

How do you think so?
Do you have anybody to know the reason?

Best regards,
Jin-Young Kim

-- 
Ph. D. Student
Jin-Young Kim (jin_at_climate.pknu.ac.kr)
Integrated Climate System Modeling Lab.
Department of Environmental Atmospheric Sciences
Pukyong National University, Busan 608-737, South Korea
Web : http:climate.pknu.ac.kr/~jin
Visiting Scholar
Jin-Young Kim (Jin-Young.Kim_at_noaa.gov)
Global Systems Division
Earth System Research Laboratory
R/GSD7
325 Broadway
Boulder, CO80305-3328
+1-303- 497-4422 (Office)
+1-303- 497-7262 (FAX)

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