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Mesoscale is a term used in meteorology to describe weather systems which fall on a scale between the storm scale and the synoptic scale, meaning that they are generally larger than individual big storms, and smaller than weather systems spanning more than 620 miles (roughly 1,000 kilometers) in diameter. A number of interesting weather phenomena happen at the mesoscale level, making mesoscale meteorology a very interesting and diverse branch of the study of weather and related events.
Some examples of weather systems which occur on the mesoscale level include: squall lines, sea breezes, and lake effect snow storms. Mesoscale meteorology includes both high and low altitude weather systems, and it examines their effect on climates, flows of water, human populations, and agriculture, among many other things. Since large stormfronts can fall within this scale, it can also include the study of how storm systems grow, how they move, and how things inside a weather system function. For example, thunderstorm convection is studied by meteorologists who focus on systems of this size.
Researchers in this branch of meteorology can spend time in the field, studying weather in person, and they also take advantage of probes such as weather balloons, along with satellites and other observation techniques. Some people are particularly interested in applying mesoscale meteorology to issues like the health of ecosystems, climate change, fisheries, and so forth, and they may spend time among human populations learning about the direct impacts of the weather they study. Field work may also include travel to learn about weather in different regions of the world, and to see how factors like terrain interplay with mesoscale meteorological events.
Researchers can also work in the lab, creating models and organizing data. Data collation also includes statistical manipulation, and the input of information into modeling systems so that those systems grow more intelligent and more effective, allowing meteorologists to make more accurate predictions, and to explore historic weather events in light of what scientists now know about modern mesoscale meteorological events.
People who are interested in working in the field of mesoscale meteorology usually study meteorology at a college or university, and focus specifically on events which fall along the mesoscale once they start doing graduate-level research and study. Specialists in this field can work for government agencies, news companies, colleges, and a variety of other organizations which have an interest in the weather, from shipping companies to museums which are interested in historic climates.