– A trough which tilts from the northeast toward the southwest. Often a trough is positive tilted in it’s development stage.

(PW, PCPTBL WTR or H2O)

(PCPN)

The force exerted by the interaction of the atmosphere and gravity. Also known as atmospheric pressure.

– A remote ground-based sensing instrument that measures wind speed and direction at different levels of the atmosphere. The new National Weather Service WSR-88D radar has this capability, and its vertical wind profile is called a VAD Wind Profile (or VWP). VAD stands for Velocity Azimuth Display.

– Model forecasted output

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