Chapter 4

Humidity, Condensation, Clouds

Hydrologic Cycle

Mass and energy transported (Figure 4.1)

Solid, vapor, liquid

Ways of Reporting Water Vapor Content

Relative humidity (%)

Vapor pressure (mb)

Dew point temperature (°F)

Measuring Water Vapor Content

Sling psychrometer (Figure 4.10)

b.     Hygrometer (see ASOS link)

Solid Water

Frost (Figure 4.13)

Liquid Water

Fog

Clouds (Ahrens Cloud Chart, inside back cover)

Classification (Table 4.2-4.4; Figures 4.19-4.32)

High

Middle

Low

Clouds with vertical development

Other unusual clouds (figure 4.33-4.36)

Some Optical Effects of Clouds

Sundogs from ice clouds (cirrus).  Pg. 415, Fig. 15.21-15.22.

Rainbows from liquid clouds.  Pg. 417, Fig. 15.24-28.

Excellent web site devoted to atmospheric optics:  http://www.atoptics.co.uk/

Drill down here for sundogs:

http://www.sundog.clara.co.uk/halo/parhelia.htm