Which weather phenomena accompany the initial CYXX visibility in the forecast?

• A. RAIN AND MIST
• B. SNOW AND FOG
• C. DRIZZLE AND HAZE
• D. FOG AND SAND

Answer: (D)

In forecasting, the value given for visibility isn’t just a number—it’s paired with the weather phenomena that are occurring with that visibility. The idea is to tell you what is causing the reduced visibility so you can anticipate the additional hazards.

Fog is the weather phenomenon that most directly explains a low visibility reading, because it literally fills the air with tiny water droplets. When the forecast also notes sand (dust in the air), that combination describes a situation where reduced visibility is due to fog plus airborne sand, which can further impair sight, outdoor contrast, and aircraft performance. That pairing—fog with sand—best matches the scenario of a low initial visibility accompanied by a second, simultaneous phenomenon.

The other options describe conditions that either don’t typically accompany the initial visibility in the same way (rain with mist, snow with fog, drizzle with haze) or describe different hazards that wouldn’t align as the primary accompaniment to the initial low visibility.