How is a mid-latitude cyclone formed:

thunderstorms on the west side of an occluded front, frontal systems in association with the Jet Stream, a lot of hot air, or cyclonic circulation around a sub-tropical high?

(Straight forward answers, if possible use the answer choices provided, please)

A mid-latitude cyclone is primarily formed by frontal systems in association with the Jet Stream.

To understand how it is formed, first, we need to know what a mid-latitude cyclone is. A mid-latitude cyclone is a large-scale low-pressure system that forms in the middle latitudes, typically between 30 and 60 degrees. It is also known as an extratropical cyclone.

Now, let's break down the answer choices to see which one is correct:

1. Thunderstorms on the west side of an occluded front: While thunderstorms can occur in association with mid-latitude cyclones, they are not the primary mechanism for the formation of these cyclones. So, this answer choice is not correct.

2. Frontal systems in association with the Jet Stream: This is the correct answer. Mid-latitude cyclones are often formed as a result of the interaction between warm and cold air masses along frontal systems, which are associated with the Jet Stream. As the Jet Stream forces these air masses to converge and interact, it creates a cyclonic circulation that leads to the formation of the mid-latitude cyclone.

3. A lot of hot air: While temperature differences can play a role in the formation of mid-latitude cyclones, simply having a lot of hot air is not sufficient. It is the interaction between warm and cold air masses that drives the formation of these cyclones. So, this answer choice is not correct.

4. Cyclonic circulation around a sub-tropical high: Mid-latitude cyclones are not typically formed due to cyclonic circulation around a sub-tropical high. Sub-tropical highs are stable high-pressure systems and are not typically associated with cyclone formation. So, this answer choice is not correct.

In conclusion, the correct answer is: Frontal systems in association with the Jet Stream.