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Drought is likely to continue

Through at least the middle of August, most of Georgia will likely be warmer and drier than normal. The weather outlook for the mountain counties is less certain.

Summer is the most difficult season to forecast for the Southeast. The El Niño -- Southern Oscillation ocean-atmosphere pattern, or ENSO, gives atmospheric scientists good guidance on what weather to expect during winter and early spring. But during the summer, ENSO has little impact on temperatures and rainfall in the Southeast. Because of this, atmospheric scientists must use other information for forecasts.

One of the best indicators of climate over a period of several weeks is persistence. Persistence means that the climate pattern will continue for a period of time. Since Georgia has been warmer and drier than normal since March, the persistence outlook is for Georgia to remain warmer and drier than normal for the next several weeks.

An additional indicator is the current drought. Even with normal temperatures and rain during the summer, the soils across Georgia continue to dry, and stream flows drop. Even if Georgia receives normal rain this summer, the drought is expected to continue.

Drought and warmer-than-normal temperatures go together and typically reinforce each other. Dry soils mean that more energy from the sun heats the soil and the air above it. Warmer temperatures mean that the soils loses more water to evaporation and plant water use.

With drought conditions leading to higher temperatures, the current drought indicates an outlook of warmer-than-normal temperatures.

During the summer, much of the rain that Georgia receives is from scattered afternoon and evening thunderstorms. With local soil moisture low, there is less moisture available for the development of these storms. The lack of moisture locally argues for a drier-than-normal summer.

During droughts, it is common for a region to experience "sinking air" from higher up in the atmosphere. This sinking air makes it difficult for scattered afternoon and evening thunderstorms to develop. Sinking air also compresses and warms. This is another example of how temperature and drought reinforce each other.

By the middle of August, the tropics are usually becoming very active. Much of Georgia's late summer and fall rains come from tropical weather systems such as tropical storms or hurricanes.

Up-to-date information on dry conditions across Georgia can be found at www.georgiadrought. org. Updated weather conditions can be found at www.georgia weather.net.

David Emory Stooksbury is the state climatologist and a professor of engineering and atmospheric sciences in the UGA College of Agricultural and Environmental Sciences.

Wildfire risk is at its highest level, according to the sign in front of the McDuffie-Warren office of the Georgia Forestry Commission. Laverne Davis, the dispatcher at the Warrenton Highway office, said another factor is the wildfire in the Okefenokee National Wildlife Refuge. "A lot of our resources are there with manpower and equipment," Davis said.



Web posted on Thursday, June 09, 2011













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