Understanding Weather

Warm, moist air over low, flatland areas on clear, calm nights. Moist, tropical air moving over cold, offshore water. The movement of cold air over much warmer water.

Good visibility and steady precipitation. Poor visibility and intermittent precipitation. Poor visibility and steady precipitation.

High temperature, high relative humidity, and high density altitude. Low temperature, low relative humidity, and low density altitude. High temperature, low relative humidity, and low density altitude.

Rain-induced fog. Upslope fog. Steam fog.

High humidity, lifting force, and unstable conditions. Lifting force, moist air, and extensive cloud cover. High humidity, high temperature, and cumulus clouds.

59°C and 1013.2 millibars. 59°F and 29.92 millibars. 15°C and 29.92″ Hg.

Radiation fog and ice fog. Advection fog and upslope fog. Steam fog and ground fog.