Pediatrics

Calls to curb infant formula's carbon footprint

Urgent action is needed to protect breastfeeding and reduce formula's carbon footprint—especially for "unnecessary" toddler milks, according to an expert at The Australian National University (ANU).

Health

Risk for carbon monoxide poisoning increases in winter

Each year, carbon monoxide (CO) poisoning is responsible for more than 50,000 emergency department visits, resulting in more than 400 deaths according to the Centers for Disease Control and Prevention. Americans ages 65 ...

Arthritis & Rheumatism

Smartphone study shows pain more likely on humid, windy days

People with long-term health conditions are 20 percent more likely to suffer from pain on days that are humid and windy with low atmospheric pressure according to new research from University of Manchester scientists.

Diseases, Conditions, Syndromes

Michigan will spray in fight against deadly mosquito virus

Michigan will conduct aerial spraying for the first time since 1980 to combat a rare mosquito-borne virus that has killed three people and been recorded across the southern half of the state.

Health

How do hospitals prepare for hurricanes?

We all expect hospitals to be open and operating when we need them, but extreme weather events like hurricanes are a strain on resources and pose significant challenges for hospitals.

Oncology & Cancer

Hidden chemistry in flowers shown to kill cancer cells

Researchers at the University of Birmingham have shown that it's possible to produce a compound with anti-cancer properties directly from feverfew—a common flowering garden plant.

Neuroscience

Biologist leads pioneering study on stress

A biologist at Louisiana State University conducted a pioneering research study that could help us to better understand the role of dopamine in stress resilience in humans through analyzing wild songbirds. This study could ...

page 1 from 23

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