Difficulty: Medium
Correct Answer: From the west with the prevailing westerly winds
Explanation:
Introduction / Context:
Understanding the general movement of weather systems is an important part of basic geography and meteorology. In many temperate regions of the world, there is a characteristic pattern to the direction from which storms and low pressure systems arrive. General science and geography questions may test whether students know this prevailing pattern in a simplified way.
Given Data / Assumptions:
Concept / Approach:
On a rotating Earth, large scale atmospheric circulation patterns develop. In mid latitude regions, roughly between 30 degrees and 60 degrees in both hemispheres, the prevailing winds are called westerlies. These winds blow from west to east and tend to steer low pressure systems, frontal systems, and storms in the same general direction. As a result, many weather disturbances, including foul weather, typically approach from the west in these zones.
Step-by-Step Solution:
Step 1: Identify the relevant wind belt for mid latitudes, which is the westerlies.Step 2: Remember that westerlies are named for the direction they come from, meaning they blow from west to east.Step 3: Recognise that fronts and low pressure systems travel along these flows, bringing clouds, rain, and storms as they move.Step 4: Compare this understanding with option C, which states that foul weather often approaches from the west with prevailing westerly winds.Step 5: Options A, B, D, and E either refer to different directions, special cases, or unrealistic situations, making them less accurate than option C for a general mid latitude rule.
Verification / Alternative check:
Maps showing average storm tracks over regions like Europe and North America clearly demonstrate an overall west to east movement of weather systems. Weather forecasts on television often show fronts and storms approaching from the left (west) side of the map in these regions. These observational patterns confirm that in many populated mid latitude areas, foul weather commonly approaches from the west.
Why Other Options Are Wrong:
Option A suggests an easterly approach, which can occur locally but is not the dominant pattern in mid latitudes. Option B, from the north, may bring cold air outbreaks but is not the usual direction of storm tracks. Option D, from the south in tropical regions, refers to a different climatic belt and does not answer the general question. Option E claiming no horizontal movement is unrealistic because large scale systems always show some horizontal motion. Thus, option C best captures the typical situation described in textbooks.
Common Pitfalls:
Students living near coasts, mountains, or in monsoon regions may experience local patterns that differ from the global average, causing confusion. Another common mistake is to assume that wind always comes from the same direction throughout the year. The key is to remember that the question asks about the general case in mid latitudes, where westerlies dominate. Keeping this context in mind helps avoid misinterpretation.
Final Answer:
Foul weather in many mid latitude regions commonly approaches From the west with the prevailing westerly winds.
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