11. Consider the following forecast. “Sunny this morning with increasing clouds
ID: 118822 • Letter: 1
Question
11. Consider the following forecast. “Sunny this morning with increasing clouds as the day progresses. High of 27. Northeasterly winds at 5-10 mph. Cloudy tonight with snow after midnight, possibly mixed with sleet after 3 a.m., and changing to freezing rain by 4 a.m. Accumulation of up to 0.25 inches of ice is possible. Temperatures nearly steady, then slowly rising to about 30. Low of 27. Winds easterly at 5-10 mph. Tomorrow: Cloudy. Rain likely before noon with freezing rain before 7 a.m. Winds shifting toward the south at 10-20 mph. High of 34.”
A weather front moved through the region during the early morning hours. Consider which day is warmer (yesterday or today). Also consider the wind directions and how they change over time. Using the changes in temperature and wind as well as the types of precipitation, is the front that passed through a warm front or a cold front? Explain how you made this decision.
12. Consider the following forecast: “Sunny this morning with increasing clouds as the day progresses. 40% chance of showers and thunderstorms this evening. High of 65. South wind at 5-10 mph this morning, becoming southwesterly and increasing to 10-20 mph. Cloudy tonight with rain and scattered thunderstorms before 2 a.m. Rain may be heavy at times. Low of 47. Gusty southwest winds will shift toward the northwest & subside to 5-10 mph. Tomorrow: Mostly sunny in the morning, partly sunny in the afternoon. High of 53. Winds northwest at 5-15 mph.”This forecast is most likely associated with the passing of which of the following fronts?
As in question 11, a weather front moved through the area overnight. Was it a cold front or a warm front? Describe the clues you used to make your decision.
Explanation / Answer
11. Today is warmer compaered to yesterday, we can see that the hightest temperature of the days has gradually increased from 27 to 34.
Taking the wind direction, we can see that the wind direction has changed from North Easterly to Easerly to Southernly. This happens when the whole front is moving (in this case it is moving towards south).
Given the types and amount of precipitation, we can say that it is a textbook Warm Front. As the warm air rises over the cold air, at first, the temperature drop will be so high that it snows in the area, as the front progresses, the snow will change into sleet and then freezing rain and finally normal rain (with Cumilonimbus clouds). The forescast has the exact set of events as time progresses.
12. The forecast is a typical movement of a Cold Front. When the warm air rises above the cold air, the temperature drop may not be so high as in a warm front, hence there will be formation of cumilonimbus clouds as the border of the front, hence there will be formation of thunderstorms.With the wind directions, we can find that the front is moving towards the north west. As the front progresses, there will be formation of Stratocumulus clouds, which will have intermittent rain and sometimes a downpour. As the front progresses more, there will be formation of fractocumulus clouds, there will be less rain compared to other clouds, and so it will be partly cloudy.
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