What does PVA stand for?

<p style=";text-align:left;direction:ltr">Arab Weather - The abbreviation PVA can carry different meanings depending on the context, but in meteorology, PVA stands for Positive Vorticity Advection. It refers to the positive swirling movement of air (cyclone) through the atmosphere, a process that typically results in an increase in air ascent, which contributes to the formation or strengthening of weather systems such as depressions and storms.</p><p style=";text-align:left;direction:ltr"> In other contexts, such as engineering or chemistry, PVA may refer to materials such as Polyvinyl Alcohol.</p>