[gradsusr] track of typhoon

[T. haghroosta]

Dear All,
 
I would like to draw the track of a typhoon. Using commands amin, aminlocx, can aminlocy,  can help me to find minimum of a value in a area. I have a problem with these commands, because they find just one value. As I understand these commands find the first minimum value in the area. Could you please tell me how can I find all minimum values in the area with their location. How can I use if command, to ask find the minimum values lower than a special value?
 
Lead me please
T.
 		 	   		  
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