Weather and Meteorology Notes

Weather and Meteorology

  • Weather: The state of the atmosphere at a specific time, characterized by elements such as:

    • Temperature (hot or cold)

    • Humidity (wet or dry)

    • Wind conditions (calm or stormy)

    • Condition of the sky (clear or cloudy)

  • Weather Variability: Weather changes on a daily basis, with printable forecasts showing conditions like:

    • Clear

    • Partly Cloudy

    • Temperature ranges, e.g., High 32° Low 19°

    • Percentage chances of precipitation.

Meteorology

  • Definition: The branch of science that studies the Earth's atmosphere and the processes occurring within it.

METAR Reports

  • METAR: Acronym for METeorological Aerodrome Report, providing essential flight data including:

    • Wind direction and speed

    • Required information for safe flying of drones

  • Applications for METAR data: Various mobile apps provide real-time METAR info, including:

    • UAV Forecast

    • Good To Fly

    • Drone Cast

    • Drone Buddy

    • AirData UAV

    • Tropogo

    • Windy

Importance of Studying Meteorology in Aviation

  • Understanding:

    • Physical processes in the atmosphere

    • Meteorological hazards and their effects on aircraft

    • Necessary weather information for flights

  • Skills Developed:

    • Interpreting weather documentation

    • Analyzing weather information pre and in-flight

    • Solutions to weather-related problems

  • Acknowledgment of weather's uncontrollable nature in aviation.

Earth's Atmosphere Composition

  • Layers surrounding Earth:

    • Exosphere

    • Thermosphere

    • Mesosphere

    • Stratosphere

    • Troposphere

  • Composition of gases in the atmosphere:

    • Nitrogen: 78%

    • Oxygen: 21%

    • Carbon Dioxide: 0.04%

    • Other Gases (mostly Argon): 0.96%

Properties of Earth's Atmosphere

  • Variations in:

    • Pressure

    • Temperature

    • Humidity

    • Density

Weather Impact on UAS Operation

  • Impact of various weather hazards on UAS (Unmanned Aircraft Systems):

    • Cloud Base: < 900 ft → visibility issues

    • Visibility: < 3 miles → impacts VLOS (Visual Line of Sight)

    • Fog, Clouds, Precipitation: Affects visibility and equipment

    • Icing: Can impair performance, induce electrical failures

    • Lightning: Causes communication losses due to RF interference

    • Wind/Wind Shear: May lead to loss of control and mission failure

    • Moderate or greater turbulence: Reduces mission duration and safety issues.

Thunderstorm Requirements and Distances

  • Cloud Altitudes:

    • Safe operational levels at specified feet above ground

    • Importance of maintaining safe distances from storm fronts and clouds to mitigate risk.