COMPOSITE OF 12 LARGEST SCALE CATEGORY 4 EVENTS. THE CENTER 0F HEAVIEST RAIN (BLACK DOT) OCCURS AT THE NOSE OF THE LOW-LEVEL JET IN/OR NEAR THE STRONGEST WARM ADVECTION IN/OR JUST NORTHEAST OF A THETA-E RIDGE IN AN AREA OF THETA-E ADVECTION
850 ISOTACHS (DASHED RED, EVERY 5 KTS), WIND DIRECTION (ARROWS) AND WARM ADVECTION (BLUE LINES, STRONGEST VALUES ARE SHADED BLUE)
850 MB EQUIVALENT POTENTIAL TEMPERATURE (RED LINES), ADVECTION OF EQUIVALENT POTENTIAL TEMPERATURE (DASHED BLUE), WIND SPEED GREATER THAN 20 KTS (YELLOW SHADING), WIND DIRECTION (ARROWS)