(10 pt) Figure 4 shows time series of pressure, dew point, and temperature here
ID: 230625 • Letter: #
Question
(10 pt) Figure 4 shows time series of pressure, dew point, and temperature here at Walker Building for a six-day period earlier this month.
a. At one time during this period, there is fairly dramatic evidence (when you utilize information from all three charts) of the passage of a front. Indicate the time of frontal passage by placing the letter “F” on the pressure graph at that time. Explain why you chose that time, invoking information from all three charts.
b. Was this a warm front or a cold front? Justify your answer.
c. Why is relying solely on a graph of temperature at a given location to assess when a front moves past that location sometimes difficult? Think about a characteristic of temperature that might mask a frontal passage.
Explanation / Answer
a) A cold front is passing on Mon 1/18. Below are the characteristic of a cold front. From these characterics we can find that cold front passage is on Monday-1/18.
b) This is a cold front. Because before the passage of cold front, there is a steady decrease of atmospheric pressure, warm temperature and increase in dew point temperature. While the cold front is passing there is lowest decrease in pressure, and then a sudden increase; sudden decrease in temperature and sudden decrease in dew point temperature. This condition satisfied in this figure 4. and so this is a cold front.
c) An abrupt temperature change over a short distance is a good indicator that a front is located somewhere in between.In flying through a cold front, there will be a noticeable temperature change when passing through the frontal surface. A pilot flying through the warm frontal surface will notice a more abrupt temperature rise.
Atmospheric Variable Before the Cold Front Passes While the Cold Front is Passing After the Cold Front Passes Atmospheric Pressure Steady decrease Lowest decrease in pressure, then sudden increase Steady increase Temperature Warm Sudden decrease in temperature Steady decrease in temperature Dew Point Increase in dew point temperature; humid Sudden decrease in dew point temperature Dew point temperature begins to fallRelated Questions
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