4. FIGURE 4.14 Average surface
dew-point temperatures (oF) for
(a) January and for (b) July.

5. FIGURE 4.14 Average surface
dew-point temperatures (oF) for
(a) January and for (b) July.

11. FIGURE 5.13 Cirrus clouds.

12. FIGURE 5.14 Cirrocumulus clouds.

13. FIGURE 5.20 A layer of low-lying stratus
clouds hides these mountains in Iceland.

14. FIGURE 5.21 Cumulus clouds. Small cumulus
clouds such as these are sometimes called fair
weather cumulus, or cumulus humilis.

15. FIGURE 5.22 Cumulus congestus.
This line of cumulus congestus clouds is
building along Maryland’s eastern shore.

16. FIGURE 5.23A cumulonimbus cloud
(thunderstorm). Strong upper-level winds
blowing from right to left produce a welldefi
ned anvil. Sunlight scattered by falling ice
crystals produces the white (bright) area beneath
the anvil. Notice the heavy rain shower
falling from the base of the cloud.