FORMS OF CLOUDS 



Well-defined cumulus clouds, forming a few hours after sunrise, increasing 

 toward the middle of the day, and decreasing -toward evening, are indicative 

 of settled weather. If, instead of subsiding in the evening and leaving the sky 

 clear, they keep increasing, they are indicative of wet. 



FIG. 14. Cumulus. 



When the cumulus clouds are smaller at sunset tlian they were at noon 

 expect fair weather. 



When cumulus clouds become heaped up during a strong wind at sunset, 

 expect thunder during the night. 



When a heavy cloud comes up in the southwest and seems to settle back 

 again, look out for rain. 



FIG. 15. Nimbus. 



Nimbus. About 1 mile high. Rain clouds. Dense masses of 

 dark, formless clouds with ragged edges from which rain or snow 



