Meteorological features associated with a PRE ahead of a tropical cyclone: 1) downstream 200-hPa jet ("J"; gray shading), 2) upstream 700 hPa trough axis (dashed black line) and height contours (black), 3) low-level jet (large arrow), 4) tropical moisture plume (light blue shading representing precipitable water values > 50 mm) emanating from the tropical cyclone: (red conventional tropical cyclone: symbol), 5) surface frontal boundary, 6) low-level wind pattern near the frontal boundary and PRE in the warm (red-arrowed lines) and cool (blue-arrowed lines) air, and 7) surface cyclone and anticyclone locations given by the red "L" and blue "H" symbols, respectively. Figure from Bosart et al. (2010).