Rudi Kiefer, Ph.D., is a professor of physical science and director of sustainability at Brenau University. In the winter, though, it can mean heavy wind and very cold conditions.Īfter a big frontal system has moved through and dumped rain or sleet, we often see two days of biting cold wind while the Canadian air is chasing after the low, and high pressure is settling into Hall County. This isn’t accurate enough for the most violent items, twisters for example, but it can warn you ahead of a strong winter storm.Ī fast rise of the needle on the barometer indicates clearing. If you have a barometer on the wall, and the needle drops rapidly (say, 5 to 10 millibars in a couple of hours), it means there’s a severe storm approaching. This is especially important when pressure changes are strong. But after applying a correction factor to the pressure readings, we can see how the two towns compare, and whether a low or a high might be moving from one to the other. The existing air pressure differences between Suches and Gainesville, caused by altitude, would muddle up the picture too much. Without that, we wouldn’t be able to tell when there’s a low (a storm) moving through our area. It also highlights impacts on socio-economic development, migration and displacement, food security. That’s why the weather maps that you see in the media make a couple of important assumptions: All the places on the map are at the same altitude, and everything is happening at the same time. According to the Intergovernmental Panel on Climate Change (IPCC), climate risk results from the interaction of hazard, exposure and vulnerability. The report on the State of the Global Climate 2020 documents indicators of the climate system, including greenhouse gas concentrations, increasing land and ocean temperatures, sea level rise, melting ice and glacier retreat and extreme weather. When dealing with weather, we’re interested in the changes that occur between places. It explains the thinner air on mountaintops, or the way you run out of breath more quickly when climbing stairs at an overlook on the Blue Ridge Parkway.īut this isn’t what’s important in meteorology. The first is the observation that pressure decreases as the altitude increases. There are two ways of looking at air pressure. So, shouldn’t the pressure be low there all the time, and Gainesville should have mostly sunny weather because of the higher air pressure? We know that if you drive from Gainesville to Suches, you’ll find yourself in much thinner air because Suches is a full 1,600 feet higher up. The concept of air pressure can be confusing for nonscientists. A low-pressure system had established itself over North Georgia, and the front that brought it refused to move out for several days. Where, M the metabolic rate (internal energy production), W the physical work. It was good to see the sun again after an entire week of rain during the middle of January. as Indicator for Impacts of Climate Change on Thermal Comfort of Humans.
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