El Ninos occur every two to seven years irregularly and tend to last for a single cycle. It is typical for these events to show signs of occurring during autumn, and then they strengthen over the winter and spring, with a drop off during the summer.
A:The average winter temperature in a cold desert is usually between -20 and -30 degrees Fahrenheit. The average rainfall for these areas is only between 6 and 10 inches per year. Tundra also experiences brutally cold wind.
A:Dawn, also known as daybreak, is the time of morning when the first light appears in the sky prior to sunrise, which is the appearance of the top of the sun over the horizon. Dawn occurs roughly 30 minutes before sunrise at sea level.
A:The factors that affect climate include elevation, latitude, wind, water currents and proximity to the ocean. Climate is not the same as weather. Climate is a long-term state, while weather changes constantly.
A:Hail forms as a result of water droplets being carried above the freezing level by updrafts from thunderstorms. If a hailstone falls toward warmer air at the bottom of a thunderstorm, it thaws. However, if it is caught in another updraft, it collects additional layers of ice, growing larger before falling to the ground as hail.
A:The rainy season in Brazil varies by location, according to Southern Explorations. Brazil is a large country, and its climate and geography vary widely from one place to the next. In most places, the rainy season and the highest amount of rainfall coincide with the Southern Hemisphere's summer.
A:A dry climate is a region of the world where there is little precipitation and the air is very dry, according to Maps of the World. Dry climate is divided by climatologists into the subclassifications of dry arid and dry semiarid.
A:Weather patterns on Earth are driven by the unequal heating of the surface by sunlight. The Sun is the ultimate source of energy that drives wind, rain and storms across the planet. The movement of wind patterns, ocean currents and even the water cycle can all be thought of as global mechanisms for redistributing heat from the Sun.
A:Hygrometers measure the amount of moisture or humidity in the air, but there are a number of different types of hygrometers, and they display their results in different ways. Most hygrometers display their readings in the amount of water in a given volume of air, making the units milliliters per cubic centimeter. Alternatively, some hygrometers measure relative humidity, which is expressed as a percentage with no units.
A:The factors that affect the temperature in an area are the latitude, height above sea level, distance from the sea, ocean currents and prevailing winds. These things work together to determine the climate of a location.
A:A tornado is a violently swirling column of air that is formed in severe thunderstorms and contains a hollow core. It is characterized by rotating air that often contains dust and debris and quickly spirals upward. The column’s bottom touches the ground, while the top extends five or more miles into the sky.
A:The Department of Geological Sciences at San Diego State University names extraterrestrial impacts, gravitational contraction and radioactive decay as the three main sources of Earth's internal heat. However, Earth's internal heat is much lower now than it was at the early period of the solar system’s existence.
A:The sun's rays are strongest daily between the hours of 10 a.m. and 4 p.m., according to Sun Safety Alliance. Experts suggest seeking shade, wearing protection or avoiding the sun altogether during these hours.
A:Yung Chung-hoi of the Hong Kong Observatory explains that the sun is overhead at the equator and at a slant angle at the poles, which is why it is very hot near the equator. The other factors that influence the amount of sunshine received at different places on Earth are absorption and scattering of sunshine when passing through the atmosphere, and reflection by the surface of the Earth.
A:According to Met Office, fog forms when numerous small water droplets become suspended in the air. Fog happens most often in heavily polluted industrial areas where water can cling to the small pollution particles in the air.
A:It is coldest just about the time of sunrise because this is the hour at which the atmosphere has been without the heat of the sun for the longest time. The lowest temperature of the day usually occurs then.
A:Rainbows form when sunlight enters water droplets from behind the viewer. The geometry of the water droplets allows for refraction and reflection. Sunlight, which is composed of light of different wavelengths, splits into the constituting wavelengths because of refraction when it enters the water droplet, and it is then reflected from the inner surface of the droplet to the viewer. The ray undergoes refraction again when it exits the droplet.