Explaining positive versus negative tilted troughs

AUSTIN (KXAN) -- Troughs play a crucial role in shaping storms and delivering all types of precipitation. A trough is an elongated area of low pressure that can stretch for hundreds of miles. When observing an upper-level jet diagram, troughs appear as a "dip" or a "U-shape". The tilt of the trough determines the atmospheric dynamics and drive of storm systems.
Example positive tilted trough setup
First, let's talk about positive tilted troughs- these troughs tip southwest to northeast and have