Fig. 21.
This class of storms, or belts of showers, present the following succession of phenomena in summer:
1. Still warm weather, one or more days.
2. Fresh southerly wind, one or more days; if more than one, dying away at the S. W., at night-fall, but continuing into the evening of the day before the belt of condensation arrives.
3. Belt of condensation, with or without rain or showers, with the easterly wind blowing axially, if the condensation is heavy and the belt wide; westerly if the condensation is feeble or the belt narrow—the clouds moving about E. N. E.
4. Cooler air, light N. W. in summer, heavy N. W. in autumn, winter, and spring.
And, the next period—
5. Still warm weather or light airs.
6. Southerly wind, fresh.