With warm front passage, winds will shift to a more ______ direction and visibility can become ______.

• A. Westerly; good visibility
• B. Northerly; excellent visibility
• C. Southerly; poor visibility
• D. Easterly; hazy visibility

Answer: (C)

A warm front brings warmer, more humid air and often steady, light precipitation. As the front passes, surface winds tend to veer toward the direction of the invading warm air, which in many cases means a shift to the south. The associated low clouds, drizzle or rain, and potential fog reduce visibility, making it poor. So shifting to a southerly direction with poor visibility fits what typically happens during a warm front passage. Winds that stay westerly or northerly or that produce good visibility are less consistent with a warming, moist air intrusion and its cloud/rain effect.