Hallett, John Division of Atmospheric Sciences, Desert Research Institute, Reno, Nevada.
Last reviewed:February 2019
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- Ice phase and cloud seeding
- Seeding effectiveness
- Hail modification
- Links to Primary Literature
- Additional Readings
Human influence on the weather and, ultimately, climate. Human impacts on weather can be either intentional, as with cloud seeding (Fig. 1) to clear fog from airports or to increase precipitation, or unintentional, as with air pollution, which increases aerosol concentrations and reduces sunlight. Weather is the day-to-day variations of the environment—temperature, cloudiness, relative humidity, wind speed, visibility, and precipitation. Climate, conversely, reflects the average and extremes of these variables, changing on a seasonal basis. Weather change may lead to climate change, which is assessed over a period of years. See also: Climatology; Weather
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