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Smoke/Fire Weather - Frequently Asked Questions Over the past few weeks, there may have been a few days that you have seen or smelled smoke in the air over north and central Georgia. In addition, you may have noticed Red Flag Warnings on the watch/warning/advisory map on our homepage. The purpose of this web page is to provide some answers to questions that have been asked the most about the smoke and the wildfire risk. Where has the smoke affecting North and Central Georgia been coming from? Believe it or not, much of the smoke that you have been seeing and smelling over the past couple weeks has been coming from wildfires in southeastern Georgia and northeastern Florida. The most significant contributors to this smoke have been the 'Big Turnaround' and 'Bugaboo' wildfires, which have burned over 470,000 acres of land in Ware and Charlton counties in Georgia and Baker County in Florida. The first "bout" of smoke across our area occurred on Sunday, April 22nd, with visibilities across north and central Georgia dropping to 2-3 miles. Smoke was also reported Wednesday, May 16th, and then again Tuesday, May 22nd. with visibilities going as low as 1 mile across portions of the Atlanta Metropolitan area and many other areas seeing significant visibility reductions. In both cases, the plumes of smoke were steered into the area by clockwise flow around a high pressure system centered to our northeast. ![]() The above visible satellite image from 10:30 AM on May 26th shows smoke streaming from the wildfires over Southeast Georgia and Northeast Florida around high pressure centered off the East coast. The most dense plume of smoke extends from near Valdosta, Georgia, through Americus, GA and into the Atlanta metropolitan area. 1000mb streamlines are overlayed on the satellite image showing the mean wind flow in the lower layer of the atmosphere. Click on the image to enlarge it. Is it uncommon for this area to be affected by smoke from fires as far away as the ones in SE Georgia and NE Florida? It actually isn't that uncommon for smoke from wildfires to travel that far of a distance. There have been many occasions in the past when smoke from fires as far away as Canada or Mexico have caused hazy conditions in the Southeast. In a majority of these cases, the smoke was not dense enough to be smelled this far away. More prolific wildfires are more common west of the Rocky Mountains in the United States than they are in the Eastern United States, so North and Central Georgia doesn't see denser smoke (similar to what we have seen on recent occasions) as often as other areas of the country. What is fire Weather?Fire weather is the use of meteorological parameters such as relative humidity, wind speed and direction, cloud cover, mixing heights, and soil moisture to determine whether conditions are favorable for fire growth and smoke dispersion. The fire weather products we issue such as the Fire Weather Planning Forecast, Fire Weather Watches, Red Flag Warnings, and Spot Forecasts are generally intended for land management agencies in our area such as the Georgia Forestry and the United States Forest Service (USFS). These products provide meteorological data which help these agencies make decisions relating to fire weather, such as when to execute controlled burns and when to expect a higher probability of wildfires. What is a Red Flag Warning? Should I be concerned about it? The criteria for the issuance of a Red Flag Warning varies from state to state. The National Weather Service in Peachtree City only provides fire weather services for our counties in North and Central Georgia. To meet Fire Weather Watch/Red Flag Warning criteria there must be a combination low relative humidities (at or below 25%), and/or gusty winds (sustained winds of 20 mph or greater), and/or winds gusting to 25 mph or greater AND Ten Hour fuels of 10% or less. To see the 10 Hour Fuel Moistures you can click on the U.S. 10 Hour Fuel Moisture or you can see what the fire danger rating is at the Georgia fire danger rating page. When a Red Flag Warning is issued by the National Weather Service, outdoor burning is strongly discouraged. Some additional websites: Advice from the Georgia Department of Human Resources JOINT INFORMATION CENTER - South Georgia/North Florida Fire Information Georgia Forestry Commision Ambient Monitoring Program Satellite Imagery From Recent Smoke Plumes Below are some recent satellite images of smoke affecting our area. MODIS images are courtesy of NASA and the University of Wisconsin. Click on any image to see a larger version of it. Back to home page
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| National Weather Service Forecast Office 4 Falcon Drive Peachtree City, Georgia 30269 Phone: 770.486.1133 Page last modified: June 4, 2007 |
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