THE PROPAGATION OF A CONVECTIVE SYSTEM IS DEPENDENT ON THE LOCATION OF: 1) THE MOST UNSTABLE AIR, 2) THE AXIS AND ORIENTATION OF THE LOW-LEVEL JET, AND 3) THE LOCATION OF THE STRONGEST LOW-LEVEL MOISTURE CONVERGENCE

UNSTABLE AIR

UNSTABLE AIR

DIRECTION OF PROPAGATION

MCS

AXIS OF LOW-LEVEL JET

1000-500 THICKNESS

1. FORWARD

2. BACKWARD

N

W

E

S

ADOPTED FROM JIANG AND SCOFIELD, 1987

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