Poor surface visibility.
A rain cloud.
A cloud with extensive vertical development.
A middle cloud containing ice pellets.
Standing lenticular clouds.
Towering cumulus clouds.
Parallel to a mountain peak, and the air is stable.
Across a mountain ridge and the air is stable.
Down a mountain valley and the air is unstable.
Movement of air.
Unequal heating of the Earth's surface.
Variation of terrain elevation.
Actual lapse rate.
Cooling from below.
Decrease in water vapor.
Warming from below.
Relative humidity reaches 100 percent.
Water vapor is present.
Water vapor condenses.
Stability of the air.
Super saturation and evaporation.
Evaporation and sublimation.
Heating and condensation.
The temperature to which air must be cooled to become saturated.
The temperature at which dew will always form.
The temperature at which condensation and evaporation are equal.
Heavy, dirty, and fast.
Heavy, clean, and slow.
Light, dirty, and fast.
Sink into the flight path of aircraft operating below the aircraft generating the turbulence.
Rise from a crossing runway into the takeoff or landing path.
Rise into the traffic pattern area surrounding the airport.
Operating at high airspeeds.
Above the large aircraft's final approach path and landing beyond the large aircraft's touchdown point.
Below the large aircraft's final approach path and landing before the large aircraft's touchdown point.
Above the large aircraft's final approach path and landing before the large aircraft's touchdown point.
Below and upwind from the heavy aircraft.
Below and downwind from the heavy aircraft.
Above and upwind from the heavy aircraft.
The appearance of an anvil top.
Maximum growth rate of the clouds.
Precipitation beginning to fall.