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During the passage of a cold front, what wind conditions can you expect?

  • A

    Southwesterly wind becoming northwesterly and increasing.

  • B

    Southeasterly wind becoming southerly and decreasing.

  • C

    Northerly wind becoming northwesterly and decreasing.

  • D
    Westerly wind becoming northwesterly and increasing.

Refer to figures.
COLD FRONT. Can be defined as cold air replacing warm air.
The denser cold air displaces/overtakes the less dense warm air => cold air will slide itself under the warm air, forcing it to rise.

  • Surface winds: Sudden change in wind direction is commonly observed with the passage of a cold front. Before the front arrives, winds ahead of the front (in the warmer air mass) are typically out of the southwest. At the time of passage, wind will suddenly veer (to the west) and gusty conditions will take place. Once the front passes through, winds usually veer to the northwest (in the colder air mass).
Note: We believe that the examiner is asking for wind conditions during after the passage of a cold front (not before the passage), hence west to northwest is more correct than southwest to northwest.

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