![]() Rain rates along Sally's track periodically exceeded 1 inch/hour near its core (yellow shading), and combined with its slow speed, led to high accumulations along the Gulf Coast. Sally weakened as it made its way through the Florida Panhandle and into southeastern Alabama where it merged with a frontal system. By mid-morning on the 16th, Sally was finally beginning to accelerate forward in response to a deepening trough over the central US and high pressure building over and off of the northeastern US. ![]() During the early morning hours of the 16th, the central pressure continued to fall as the storm continued to creep to the north-northeast towards the coast between 2 and 3 mph.Īccording to the National Hurricane Center (NHC), Sally finally made landfall at 4:45 am CDT near Gulf Shores, Alabama as a Category 2 storm with sustained winds of 105 mph. At 10:00 pm CDT, the center was located just 60 miles southwest of Pensacola. Sally’s intensity also dropped off during the day on the 15th but by evening was beginning to rebound. However, a slowly approaching trough over the central US started to turn Sally towards the north. During the overnight hours of the 14th, Sally’s forward speed dropped to just 2 mph and remained there throughout the entire day of the 15th. By now the center was just about 100 miles from the mouth of the Mississippi and outer rain bands were starting to come ashore in the Florida Panhandle. Sally continued to intensify and by late in the afternoon had reached Category 2 intensity with sustained winds reported at 100 mph by the National Hurricane Center (NHC). Download this video (right-click -> "Save As") The multi-colored line shows Sally's track based on National Hurricane Center advisories, with orange indicating hurricane strength winds. This animation shows rainfall rates (blue/yellow shading) and rainfall accumulations (green shading) from NASA's IMERG algorithm, overlaid on shades of white/gray cloud data from NOAA infrared satellite instruments. NASA combined data from multiple satellites to estimate the rainfall from Hurricane Sally in near-realtime at half-hourly intervals from September 11-17, 2020. At this time, Sally was moving at just 6 mph as it neared the southwestern edge of the weakening area of high pressure With the wind shear abated, additional convection allowed Sally to intensify into a hurricane late on the morning of the 14th. Despite some bursts of convection, Sally remained a tropical storm. The 13th saw Sally continuing to make its way steadily northwestward through the eastern Gulf of Mexico in the direction of southeast Louisiana. By this time, Sally was moving northwestward in response to a high pressure ridge northeast of the system over the Carolinas. However, despite the warm waters, Sally was slow to intensify as northwesterly wind shear prevented the system from really organizing after emerging from land. By early afternoon, it was a tropical storm and named Sally. The depression moved across south Florida and emerged back over the open waters of the southeast Gulf of Mexico late on the morning of the 12th. ![]() The system continued westward and was still a tropical depression when it came ashore near Miami during the early morning hours of the 12th. Sally started as a tropical depression (TD # 19), which formed from a wave of low pressure, on the afternoon of September 11th in the western Bahamas. But, while Marco was largely sheared apart with most of the rain well northeast of the center as it slowed near the coast, Sally was still intensifying and had a much larger and more developed rain field, leading to rainfall totals on the coast roughly 3 times that of Marco. Though not as powerful as Laura, the still rather strong Sally behaved more like Marco. Now, just over 3 weeks since Laura made landfall, the northern Gulf Coast was struck again, this time by Hurricane Sally. At the end of August, then Tropical Storm Marco brought heavy rains to parts of the Florida Panhandle while western Louisiana took a direct hit from the much more powerful Category 4 Hurricane Laura. The northern Gulf Coast has seen its share of storms this busy hurricane season. ![]()
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