Health

Spring ahead with spring vegetables

(HealthDay)—Celebrate spring with farm-fresh foods that usher in the season—asparagus, peas and watercress. They're low in calories, have fresh flavor and are the perfect way to energize for warmer weather.

Health

For an energizing workout, take it outside

(HealthDay)—As the weather starts to warm up, you might be excited to restart a swimming routine, but swimming isn't the only water sport that's also fun exercise. Many activities that used to be vacation-only pastimes ...

Cardiology

Climate Change: Heat-induced heart attack risk on the rise

Heart attack, or myocardial infarction, is the number one cause of death worldwide. A study published in the European Heart Journal by scientists at Helmholtz Zentrum München and colleagues from a range of other Bavarian ...

Health

Heat alerts may come too late in northern states

(HealthDay)—Hospital admissions for heat-related health problems increase in northern states long before heat alerts are issued, and these higher admission rates occur at lower temperatures than in the South, where people ...

Gerontology & Geriatrics

Lonely and isolated – but not by choice

The unpredictable winter weather can be dangerous for anybody. It can have a greater impact on older adults who struggle with their concerns for safety against their ability to get out of the house.

Health

Blood donors needed as cold weather freezes U.S. supply

(HealthDay)—The U.S. blood supply is expected to drop to dangerously low levels as sub-zero weather in many parts of the country forces cancellation of crucial blood drives, American Red Cross officials warn.

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Weather

Weather is a set of all the phenomena occurring in a given atmosphere at a given time. Weather phenomena lie in the troposphere. Weather refers, generally, to day-to-day temperature and precipitation activity, whereas climate is the term for the average atmospheric conditions over longer periods of time. When used without qualification, "weather" is understood to be the weather of Earth.

Weather occurs due to density (temperature and moisture) differences between one place and another. These differences can occur due to the sun angle at any particular spot, which varies by latitude from the tropics. The strong temperature contrast between polar and tropical air gives rise to the jet stream. Weather systems in the mid-latitudes, such as extratropical cyclones, are caused by instabilities of the jet stream flow. Because the Earth's axis is tilted relative to its orbital plane, sunlight is incident at different angles at different times of the year. On Earth's surface, temperatures usually range ±40 °C (100 °F to −40 °F) annually. Over thousands to hundreds of thousands of years, changes in Earth's orbit affect the amount and distribution of solar energy received by the Earth and influence long-term climate

Surface temperature differences in turn cause pressure differences. Higher altitudes are cooler than lower altitudes due to differences in compressional heating. Weather forecasting is the application of science and technology to predict the state of the atmosphere for a future time and a given location. The atmosphere is a chaotic system, so small changes to one part of the system can grow to have large effects on the system as a whole. Human attempts to control the weather have occurred throughout human history, and there is evidence that human activity such as agriculture and industry has inadvertently modified weather patterns.

Studying how the weather works on other planets has been helpful in understanding how weather works on Earth. A famous landmark in the Solar System, Jupiter's Great Red Spot, is an anticyclonic storm known to have existed for at least 300 years. However, weather is not limited to planetary bodies. A star's corona is constantly being lost to space, creating what is essentially a very thin atmosphere throughout the Solar System. The movement of mass ejected from the Sun is known as the solar wind.

This text uses material from Wikipedia, licensed under CC BY-SA