Question

exercise 18 problems part 1

EXERCISE 18: Midlatitude Cyclones Name Section EXERCISE 18 PROBLEMS-PART I s ae mand the positonso ttical weather map in the Northern Hemisphere positions of a cold front and a warm front (top of map is north). Six loca- A, B B.D, E, and F is shoup boints A B. C. D. E, and F), A cross section diagram along points c, D, E, and F is shown below the map. Low Map view Cross section On the map, label the following: (a) (b) (c) (d) 1. Cold front (use standard weather map symbols) Warm front (use standard weather map symbols) Cool sector of storm Warm sector of storm 109

Answer 1

1. The map below shows the appropriate symbols for the cold (blue triangles) and warm (red semi-circles) fronts, and the warm and cool sectors of the storm.

snown below the map. NOR Low EAST WEST Warm sector Map view: SOUTH

2. The map above shows the wind directions in the western, southern, eastern, and northern parts of the storm, i.e. northwesterly, southwesterly, southeasterly, and northeasterly respectively.

3. The storm as a whole is moving from the west to east as the low-pressure system is rotating the winds in an anti-clockwise direction.

4. The cross-section below shows the cold front and warm front bordered by blue and red respectively. The fronts enclose the cold, cool and warm air masses. The directions of cold and warm fronts are marked with blue and red respectively.

Cold front Warm front Warm airCool air Cold air Cross section:

5. The most likely wind direction at point D is from the southwest as the winds are moving in an anticlockwise direction around the low-pressure system.

6. a) At point D, the pressure is falling.

b) This is because of the rising warm air and the gradual replacement of the cold air from the west with the warm air at point D.

7. a) Precipitation is more likely at point C.

b) This is because of the vertical movement of warm air over the cold air at point C which causes convection and tall clouds capable of producing showers.

8. a) At point C, there will be a decrease in temperature with the passing of the cold front.

b) The reason for the decrease in temperature is that the sky conditions will be overcast due to the formation of thick, cumulonimbus clouds.

9. The most likely wind direction at point B is southwesterly as the winds are blowing counterclockwise around the low-pressure center.

10. a) At point B, the pressure is rising.

b) The rise in pressure occurs after the passage of the cold front as the cold, dry and heavy air sinks towards the surface creating fair weather conditions.