Requirements for cloud to form: Saturated Air – Temperature equals Dew Point or below. Condensation Nuclei – Dust, smoke etc. Lifting Processes: Orthographic – mountains.

Clouds that touch the ground are fog. Warm Moist air moving over a cold surface can create fog. 8.26 Visibility and Fog

Drizzle – Fine and close together droplets. Droplets can be suspended due to small size causing bad visibility. Snow – Ice crystals. Remains frozen Sleet –

Most common in cool summer or early fall days when there is high moisture Can happen at warm temperatures as Venturi effect in the carburetor

Ice is formed through deposition (Gas directly to Solid). Cold moist air will form into hoar frost when passing over a very cold surface i.e

Three conditions are required for the development of thunderstorms: Rising Air Moisture Unstable Air 8.30.2 State the three conditions required for the development of thunderstorms.

8.32.6 Describe the mountain lee-wave (standing wave) development process

Three stages in the life-cycle of a thunderstorm: Cumulus/ Growing Stage – Strong updrafts, often suspending all water or ice Mature Stage – Heavy water

Warm moist air rises over a mountain. Air expands and cools adiabatically on the way up. Reaches dew point and rains. Air is compressed and

A front marks the boundary between two air-masses, and appears on the weather map as a line with triangles or semicircles attached. Cold – Cold

Isobars – lines of equal pressure marked as lines around highs and lows. The closer the isobars, the stronger the winds Anticyclone (“high”) – Shown as

Wind forced over the mountain ridge will rise over the terrain and then sink after, this continues oscillating for a large distance. Beneath the oscillations