1 Drought for the previous five years 2 No rain since May 7 normal summers

1 drought for the previous five years 2 no rain since

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1) Drought for the previous five years 2) No rain since May 7 (normal), summers normally have no rain 3) Very Low Humidity (as low as 10%) 4) Santa Ana Winds (compression, heat, low humidity winds of 40 – 50 mph, with gusts up to 100 mph). 5) No clearing of underbrush (State budget shortfalls precluded this.) 6) High temperatures of 90 0 F and greater
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7) People have settled at the edge of the National Forests, National Wilderness Areas, and National Rangelands. So the location of peoples’ homes makes them vulnerable to the periodic fires that are a natural part of living in Southern California. 8) Population in Southern California doubled over the previous 30 years, creating more pressure for people to live in environmentally marginal areas. Destructive Cycle Winter rains encourage a buildup of chaparral (dryland vegetation) and underbrush . Santa Ana Winds come in the fall, after a dry summer and perhaps several years of drought. Facilitate the burning of underbrush . When winter comes, mudslides occur on the previously burned hillsides, since there is no brush to absorb and filter the rains.
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Continuous Belts Across the Earth Two zones where the same air pressure is found continuously around the globe: a) The subpolar low pressure zone in the Southern Hemisphere . It is not interrupted by land. b) The Equatorial Low Pressure zone is essentially continuous around the globe . It migrates south of the Equator in the Southern Hemisphere summer, and it migrates north of the Equator in the Northern Hemisphere summer.
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Hadley Cells The Hadley Cell Model is generally applied to the circulation between 30 0 N and 30 0 S. Warm rising air near the Equator (from intense surface heating there) releases latent heat during the formation of cumulus towers. This latent heat provides the energy to drive this cell . These clouds also provide the rainfall that maintains the lush vegetation of the equatorial rainforests . After releasing its moisture, the warm, dry air continues to spread poleward at altitude. Between 20 0 and 35 0 latitude, the high altitude flow of the Hadley Cell begins to subside (descends) . The center of the subsidence is at 25 0 N and 25 0 S. Radiation cooling increases the density of the air aloft as the flow moves away from the stormy Equatorial Region. The air becomes colder and more dense, facilitating subsidence . Subsiding air is relatively dry, because it has released its moisture near the Equator, and because of adiabatic heating during descent .
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Global Test Ban Treaty (1963) Agreed to by the four nuclear nations at that time. The test ban treaty banned the above ground testing of nuclear weapons. Prior to 1963, the four nuclear nations had been testing nuclear weapons above ground. The United States had tested nuclear weapons at the Nevada Test Site, the British on islands off the southwest coast of Australia; the French in the Marshall Islands in the Pacific Ocean; and the Soviet Union in the Ural Mountains within its territory.
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  • Fall '16
  • Mark Smith
  • weather, Tropical cyclone, Atmospheric dynamics

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