News about the health and beauty of the natural world that sustains us.
November 13-19 is the National Geographic Society's Geography Awareness Week. This year's theme is The Adventure in Your Community. Geography is all around us and varies from region to region in the United States. Did you know that geography and weather are very closely linked? Explore some of the connections below.
- Pacific Northwest: There are several volcanoes in the Pacific Northwest, including Mount St. Helens, Mount Rainier and Mount Hood. Volcanic eruptions can impact local weather. Eruptions emit particles and gases into the atmosphere, creating a haze. This haze can remain in the air for years, reflecting the sun's rays and reducing temperatures at the Earth's surface.
- Western US:
- Great Lakes: The Great Lakes region is known for its lake effect snow. As cold air passes over the Lakes, warmer water below evaporates and heats the bottom layer of cold air. Warm, moist air rises and cools, causing condensation and cloud formation. If humidity is high enough and temperatures are cold enough, snow falls. Winds push these clouds over land, where increased friction slows the winds, leading to more snowfall accumulation. As winds move farther inland and encounter hills, rising air cools even more, creating even more snow!
- Great Plains: The Great Plains may be known as Tornado Alley, but their topography allows for another weather phenomena - blizzards! The Rocky Mountains to the west are the driving force for blizzards in the Great Plains. A cold polar air mass that moves off the Rockies pushes southward accompanied by high winds, intense cold and considerable amounts of snow that can last for several days.
- South Central US: Droughts are periods of unusually dry weather that the South Central United States experiences at time - including right now. Droughts can bring upon dust storms, which are common in arid and semi-arid regions. A dust storm occurs when a gust of wind blows loose sand or dust particles off the ground, breaks down the particles and keeps them suspended in the air. Dust storms can spread over the hundreds of miles and well over 10,000 feet in the air.
- Eastern US: One geographic feature that affects the entire East Coast is the Atlantic Ocean. The ocean plays a big role in determining the temperatures near the coast. During fall and winter when the ocean is warmer than the land, the coastal regions experience warmer temperatures than the inland areas. In the springtime, ocean breezes keep temperatures along the coast cooler than inland areas.
(Sources: National Science Teachers Association, "Earthquakes, Volcanoes, and Tsunamis", "A Rain Shadow", “Warm water helps create Great Lakes snowstorms.” University Corporation for Atmospheric Research. 2008, US Department of State, "The Great Plains and Prairies", Kidz World, "Dust Storms", “Cold air damming can bring ice to East.”, “Warm water helps create Great Lakes snowstorms.” University Corporation for Atmospheric Research. 2008., United States Search and Rescue Task Force, "Predicting Weather")