6/17/2023 0 Comments Dixie fire update containment![]() On Sunday evening, PG&E notified 39,000 customers that it may have to shut off power Tuesday evening due to a forecast of dry winds out of the north-east. The Dixie fire began near the town of Paradise, which was devastated by a 2018 wildfire ignited by PG&E equipment during strong winds. Pacific Gas & Electric has notified utility regulators that the Dixie and Fly fires may have been caused by trees falling into its power lines. Numerous evacuation orders were in effect. More than 1,100 buildings have been destroyed, including 625 homes, and more than 14,000 structures remained threatened. The Dixie fire has scorched 890 sq miles (2,305 sq km) in the northern Sierra Nevada and southern Cascades since it ignited on 13 July and eventually merged with a smaller blaze called the Fly fire. Information officer Jim Evans said: “In this environment, any type of wind, no matter what direction – especially the way the fire’s been going – is a concern for everyone.” The current map may contain hot spots up to 48 hours old.Conditions that suppressed the huge Dixie fire overnight were expected to give way late in the day to winds that could push flames toward mountain communities, in a region where drought and scorching summer heat have turned vegetation to tinder. Hot spots should be considered points with no radius or resolution. every 30 minutes, and otherwise as time permits. NOAA's Hazard Mapping System Fire and Smoke Product (HMS) is based on locations of fires and significant smoke plumes detected by meteorological satellites. But because of the distance of the satellites, the nature of the measurements and obfuscation by smoke, the resolution is coarse and not 100% accurate. CalFire and others use this same data to help identify fires and their hot spots. The hot spots are an approximation and do not include all areas affected by fire, nor do they indicate with certainty an area was affected. Hot spots are locations identified by satellite analysts from the National Oceanic and Atmospheric Administration (NOAA). VIIRS-I also has improved nighttime performance. The 375-meter spatial resolution provides a greater response over fires of relatively small areas and provides improved mapping of large fire perimeters. ![]() The Visible Infrared Imaging Radiometer Suite (VIIRS-I) provides data from sensors aboard the joint NASA/NOAA Suomi National Polar-orbiting Partnership satellite. At this time, there is no way to discriminate between these two possibilities. The identification of a fire can be the result of a hot fire in a relatively small area or a cooler fire over a larger area. The identification of a "fire" by MODIS does not necessarily mean the entire area represented is on fire. Thermal information is collected at 1,000-meter spatial resolution. The Moderate Resolution Imaging Spectroradiometer (MODIS) displays fire detection data and uses fire and thermal anomalies data compiled via MODIS satellites Terra and Aqua. But because of the distance of the satellites, the nature of the measurements and obfuscation by smoke, the resolution is coarse and not 100 percent accurate. CalFire and others use this data to help identify fires and their hot spots. They are an approximation and do not include all areas affected by fire, nor do they indicate with certainty an area was affected. The perimeters are intended to provide a picture of the scope and extent of the fires in California, as well as parts of Nevada and Oregon, with the most current data possible. Perimeters are not available for every incident.įire perimeters for incidents before Jare based on infrared and thermal imaging from NASA's MODIS and VIIRS-I products. Perimeters do not include prescribed or incident complex fires. This map displays all current wildfire fire perimeters available through NIFC that have not been 100% contained. ![]() Fire Perimetersįire perimeters are based on geographic data from the National Interagency Fire Center, updated once an hour.
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