RADARSAT-1 synthetic aperture radar image of frontal intersections over the Bering Sea, 5:00 UTC on October 31, 1999.  Image is centered at 56 N, 169 W. RADARSAT-1 data © Canadian Space Agency.  For more information, see Young, G. S., T. D. Sikora, and N. S. Winstead, 2005:  Use of synthetic aperture radar in fine-scale surface analysis of synoptic-scale fronts at sea.  Wea. Forecasting , 20, 311-327.