Figure A1 shows two air masses and a front. Study the figure and then describe t

Question

Figure A1 shows two air masses and a front. Study the figure and then describe the weather condition occurring.

Select the two that apply

Select the two that apply

Line A is a warm front. The air mass on the right has a higher specific humidity than the air mass on the left. The air mass to the west of the front is a mT air mass. The prevailing winds are from the south in the region to the east of the front. The front will move from east to west. LINE A Air mass (West) Air mass (East) 49 2 69 S6 bo 2 6l 12 6q S I 63 70 Figure A1: Two different air masses and the location of a front

Explanation / Answer

A colder, drier air mass is pushing the front from the west, so Line A is a cold front. Option 1 is incorrect.

The air mass on the right has a higher specific humidity as indicated by a higher degree of saturation due to a lesser difference between the air temperature (figure on the upper left of the circles) and the dew point temperature (figure on the bottom left of the circles). Option 2 is correct.

The air mass to the west of the front is a cP air mass as it is relatively colder and drier which is not a characteristic feature of an mT air mass. Option 3 is incorrect.

The prevailing winds to the east of the front are from the south in the region as indicated by the wind barbs showing an almost southerly (blowing from south to north) direction of winds. So, option 4 is correct.

The front will move from west to east as the colder, drier air mass with a westerly direction is pushing the front towards east. So, option 5 is incorrect.

Thus, the two correct options are:

The air mass on the right has a higher specific humidity than the air mass on the left.

The prevailing winds are from the south in the region to the east of the front.

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