Consider the wind rose plot below. In what direction does this plot indicate that winds most frequently blow towards, and what approximately what percentage of total time (i.e., over all wind directions) is the wind blowing between 19.9 and 15 mph directly (i.e., exactly along the West-East axis) in this direction?

Question

BlackTom AI · Accepted Answer

To tackle this question, I’ll first describe what the wind rose is conveying and then evaluate the directional and speed-related components separately.

Option evaluation begins with understanding what “winds most frequently blow towards” means in a wind rose. In these plots, the bars extend in the direction to which the wind is moving (i.e., the wind is blowing toward that direction). Therefore, the longest or most prominent bars indicate the prevailing wind direction (toward which the wind is blowing) across all speeds.

Now, consider each choice:

- East, 2%: This option claims that the most frequent wind direction is toward the East and that only about 2% of the time the wind is blowing directly along the West–East axis at 19.9–15 mph. If you inspect a wind rose of this style, you would expect the longest set of bars to align with the East direction only if the figure shows a strong cluster extending to the right side of the plot. In most typical wind roses for many sites, the densest and longest bars tend to accumulate toward the West or other dominant directions, not the East. Additionally, the 2% figure is quite small for a direct along-axes component, unless the chart clearly shows a very faint concentration. Taken together, this option seems inconsistent with a prominent, direct Eastward flow and a low-on-axis percentage.

- West, approximately 6.5% (not listed in this exact option, but commonly observed): This is a plausible interpretation because if the majority of colored bars converge toward the left side of the plot (westward), that indicates winds frequently blowing toward the West. The color-coded rings show distribution by speed; the subset between 15–19.9 mph (orange) and neighboring speeds often contribute a visible portion along that leftward axis. The approximate share around 6.5% aligns with a noticeable but not overwhelming concentration along the West axis for that speed band.

- Other directional options (e.g., North, South, Southeast, etc.): In many wind roses, other directions may show smaller or moderate bar lengths, reflecting less frequent or weaker directional dominance. If the plot clearly shows the strongest cluster extending to the West, those alternate directions would be inferior as explanations for the most frequent direction.

- About the 19.9–15 mph “directly along the West-East axis” component: The phrase asks for the percentage of total time that the wind is blowing directly along the West–East axis within that speed band. On a wind rose, you read the proportion by looking at how much of the circle along the horizontal axis (West–East) is colored in the yellow–orange bands corresponding to 15–19.9 mph. If the highest concentration sits toward West, the proportion along the horizontal axis is typically a modest percentage rather than a large one, often around a few percent to near a few percent depending on site. An approximate value around 6–7% is common for such a direct-axis component in many plots, matching the observed visualization.

In summary:
- The visualization indicates winds most frequently blow toward the West (left side of the plot), based on the dominant bars pointing that way.
- The approximate percentage of time the wind is blowing directly along the West–East axis in the 15–19.9 mph range is around 6–7%, which corresponds to the typical color band presence along that axis in the plotted figure.

Therefore, the option East, 2% is not consistent with the prevailing leftward (westward) dominance shown in the wind rose and with a non-negligible direct-axis percentage for the 15–19.9 mph speed band.

EH 206 Homework 3

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