OBSERVATIONS 5-1
 Surface Aviation Weather Observations 5-1
 Upper Air Observations 5-1
 Radar Observation 5-1

SERVICE OUTLETS 5-1
 FAA Flight Service Station (FSS) 5-1
 Pilot's Automatic Telephone Weather Answering System (PATWAS) 5-1
 Transcribed Information Briefing Service (TIBS) 5-1
 Direct User Access Terminal Service (DUATS) 5-1
 Transcribed Weather Broadcast (TWEB) 5-1

WEATHER BRIEFING 5-1
 Standard Briefing 5-1
 Abbreviated Briefing 5-1
 Outlook Briefing 5-1

NATURE OF THE ATMOSPHERE 5-2
 Oxygen and the Human Body 5-2
 Significance of Atmospheric Pressure 5-2
  Measurement of Atmospheric Pressure 5-2
  Effect of Altitude on Atmospheric Pressure 5-2
  Effect of Altitude on Flight 5-2
  Effect of Differences in Air Density 5-2
  Pressure Recorded in "Millibars" 5-2
  Wind 5-2

THE CAUSE OF ATMOSPHERIC CIRCULATION 5-3
 Wind Patterns 5-3
 Convection Currents 5-3
 Effect of Obstructions on Wind 5-3
 Low-Level Wind Shear 5-3
 Wind and Pressure Representation on Surface Weather Maps 5-3

MOISTURE AND TEMPERATURE 5-4
 Relative Humidity 5-4
 Temperature/Dewpoint Relationship 5-4
 Methods by Which Air Reaches the Saturation Point 5-4
 Effect of Temperature on Air Density 5-4
 Effect of Temperature on Flight 5-4
 Effect of High Humidity on Air Density 5-4
 Effect of High Humidity on Flight 5-4
 Dew and Frost 5-4
 Fog 5-4
 Clouds 5-4
 Ceiling 5-4
 Visibility 5-4
 Precipitation 5-4

AIR MASSES AND FRONTS 5-5
 Warm Front 5-5
  Flight Toward an Approaching Warm Front 5-5
 Cold Front 5-5
  Fast-Moving Cold Fronts 5-5
  Flight Toward an Approaching Cold Front 5-5
  Comparison of Cold Fronts with Warm Fronts 5-5
 Wind Shifts 5-5
 Occluded Front 5-5

AVIATION WEATHER REPORTS, FORECASTS, AND WEATHER CHARTS 5-6
 Aviation Weather Reports 5-6
  Aviation Routine Weather Report (METAR) 5-6
  Pilot Weather Reports (PIREPS) 5-6
  Radar Weather Reports (RAREPs) 5-6
 Aviation Forecasts 5-6
  Terminal Aerodrome Forecasts (TAF) 5-6
  Area Forecast (FA) 5-6
  In-Flight Weather Advisories 5-6
  Significant Meteorological Information (SIGMET) 5-6
  Airmen's Meteorological Information (AIRMET) 5-6
  Convective Significant Meteorological Information 5-6
  Winds and Temperatures Aloft Forecast (FD) 5-6
 Weather Charts 5-6
  Surface Analysis Chart 5-6
  Weather Depiction Chart 5-6
  Radar Summary Chart 5-6
  Significant Weather Prognostic Charts 5-7