## What does vorticity mean for weather?

Vorticity is a clockwise or counterclockwise spin in the troposphere. Streamwise vorticity is the amount of horizontal vorticity that is parallel to storm inflow. Storm inflow is the velocity of the low-level wind moving toward a thunderstorm.

## How is vorticity generated?

Vorticity is generated continuously by the tangential pressure gradient at the lower boundary, and at the upper boundary at same rate (sense of normal reversed) • Each diffuses towards the centre plane where the positive and negative fluxes suffer annihilation. The circulation per unit length of channel is zero.

**Where is relative vorticity highest?**

The earth’s rotation creates vorticity, which is a maximum at the poles and zero at the equator. Relative vorticity is caused by curving airflow (shown) and by wind shear (next slide). Differences in wind speed in the horizontal direction (wind shear) also creates relative vorticity.

### Is vorticity conserved?

Conservation of potential vorticity: Physically equation (8) shows us that, for an inviscid and incompressible fluid2, the potential vorticity of a fluid parcel is conserved along its motion in the atmosphere or ocean. This is an important and simple result in Geophysical fluid dynamics.

### What is the physical significance of vorticity?

Circulation and vorticity are the two primary measures of rotation in a fluid. • Circulation, which is a scalar integral quantity, is a macroscopic measure of rotation for a finite area of the fluid. • Vorticity, however, is a vector field that gives a microscopic measure of the rotation at any point in the fluid.

**What is a vorticity maximum?**

A vorticity max is the highest value of positive vorticity (point location) within a region of positive vorticity. A vorticity lobe is an axis of high positive vorticity values. You can think of a vorticity max as a “bullseye” and a vorticity lobe as an “elongated bullseye”.