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Hi Rod, Sorry for the slow reply; I was helping to put on a regional training workshop at SJSU this past week, and I did not return to Boulder until last (Saturday) night. re: > Question about the attached image. So the range and bearing tool for > instance in this case is crossing two pixels. Correct? Just to verify. Hmm, is your the range and bearing tool the green line? The green line looks like it crosses/touches on 5 pixels, not 2. The red line look more like the range and bearing tool line since there is a triangle in the center of the line. If the red line is your range and bearing tool like, then I can not say how many pixels it crosses/touches on since the beginning and end points of the line are not included in the image you sent (PixelExplanationCalculation.jpg) re: > Also....the back azimuth angle with the range and bearing tool is set to > 227 degrees.. the storm direction angle stated in the tornado warning. OK. re: > Is > the angle of storm motion the back azimuth angle set at x distance km? I am not sure I understand the question. I assume that the storm motion would always be referred to like wind speeds: a wind of 270 degrees is coming directly out of the west. Is this what you are asking? Cheers, Tom -- **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: KUF-449541 Department: Support McIDAS Priority: Normal Status: Closed