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Two things are needed for hail to form: Strong updrafts inside the cloud (an updraft is when wind blows upwards, away from the earth) and freezing temperatures in the upper part of the cloud. If you're up for a challenge, explore the Make a Weather Forecast activity to learn more about forecasting symbols.Hail is made inside thunderclouds-not all thunderclouds, though. You may have WONDERed from time to time about the symbols used on the map.
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To get data from the seas and the upper atmosphere, data-collection tools and instruments may be attached to ships, airplanes, and even buoys in the middle of the ocean.
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Some of the tools they use include barometers that measure air pressure, anemometers that measure wind speed, Doppler radar stations to monitor the movement of weather fronts, and psychrometers to measure relative humidity. They collect and share data to help improve forecasts.
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Technologically-advanced weather stations are established by meteorologists all over the world. They can report their observations to local meteorologists to help improve local forecasts. Where does all this data come from? Sometimes it comes from regular people like you! Many people create their own backyard weather stations with thermometers to measure temperature and rain gauges to measure precipitation. Numerical forecasting requires powerful supercomputers and tons of observational data from land, sea, and air weather stations around the world. Today, meteorologists use complicated mathematical equations to help predict the weather as part of a process known as numerical forecasting. Fortunately, modern technology has allowed forecasters to become much more accurate over the last decade. Since there are a wide variety of factors that go into a forecast, it's possible for meteorologists to guess wrong from time to time. Forecasts are a prediction based upon an educated guess. Weather forecasting is not a perfect science. What happened? How could the weather forecast have been so wrong? Unfortunately, you woke up to clear skies, no snow, and a full day of school ahead. Have you ever seen a forecast that called for lots of snow? You might have gotten excited, anticipating a snow day and the chance to do some sledding. The people who study the weather and put together forecasts are scientists known as meteorologists. Not only do they warn us of potentially-dangerous weather headed our way, they also give us an idea of what to expect in terms of temperature and chance of precipitation, so we can dress and equip ourselves appropriately. Weather forecasts help us prepare for the future, whether it's a few hours from now or the rest of the week. Can your parents see into the future? Do they have a crystal ball? Not likely! They probably just checked the weather forecast. Before you can even protest, you're told that the temperature is going to drop when it begins to rain later this afternoon. What's the deal? You look out the front door, and it doesn't look cold or rainy. You grab your backpack and head for the front door, but you're stopped by a parent's voice reminding you to grab your coat and an umbrella. The school bus is going to arrive any minute now. You check the clock and realize you're running late. National Centers For Environmental Prediction,.