Essentials of Meteorology: An Invitation to the Atmosphere, 6th Edition (c2012), textbook by C. Donald Ahrens.

TEXTBOOK INFO:  http://www.cengage.com/search/productOverview.do?N=0&Ntk=P_Isbn13&Ntt=9780840049339
(current edition: 7th c2015)

CONTENTS:
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1. The Earth’s Atmosphere.
2. Warming the Earth and the Atmosphere.
3. Air Temperature.
4. Humidity, Condensation, and Clouds.
5. Cloud Development and Precipitation.
6. Air Pressure and Winds.
7. Atmospheric Circulations.
8. Air Masses, Fronts, and Middle Latitude Cyclones.
9. Weather Forecasting.
10. Thunderstorms and Tornadoes.
11. Hurricanes.
12. Global Climate.
13. Global Climate.
14. The Earth’s Changing Climate.
15. Light, Color, and Atmospheric Optics.
APPENDIXES:
A. Units, Conversions, Abbreviations, and Equations.
B. Equations and Constants.
C. Weather Symbols and the Station Model.
D. Humidity and Dew-Point Tables (Psychromatic Tables).
E. Standard Atmosphere.
F. Beaufort Wind Scale (Over Land).
G. Köppen's Climatic Classification System.
H. Average Annual Global Precipitation.

FILE INFO: paginated, bookmarked, true PDF.

5th edition (c2008) also available as torrent: Google "ahrens-essentials-of-meteorology-5th-ed-c2008-txtbk-t6407128.html" or "C661CFE5748AA841EE7194DF46A5380F33ADC968" for a .torrent file or a magnet link.