For 10 points name these tropical storm systems that contain areas of low pressure and warm circulation, an example of which sees a calm at its center or "eye."
When two of these are near each other, the Fujiwhara effect occurs, resulting in their centers orbiting around a point in between the two systems. Their formation is aided by upper-level speed divergence in the vicinity of the jet stream coupled with weak surface convergence. They must form in high humidity regions at least 5 degrees from the equator because the Coriolis effect is crucial to their initial rotation. These systems are classified by winds reaching a 12 on the Beaufort scale. For 10 points name these tropical storm systems that contain areas of low pressure and warm circulation, an example of which sees a calm at its center or "eye."
When two of these are near each other, the Fujiwhara effect occurs, resulting in their centers orbiting around a point in between the two systems.
tropical cyclone [or hurricane; cylonic vortex; typhoon; tropical storm until mentioned; tropical depression; prompt on partial answers of any of these; do not accept “low pressure center” or “tropical wave”]