10, 2017, by the British Ministry of Defence, shows the destruction left in Road Town, Tortola, British Virgin Islands by Hurricane Irma. This undated photo, provided on Sun., Sept. Multi-sensor rainfall estimates (shown in inches) exceeded 10” in parts of northern Florida and far southeast Georgia during the 24 hours ending at 8:00 am EDT Monday, September 11, 2017. Tropical-storm-force winds extended into north Georgia on Monday afternoon: at 3 pm EDT, winds were sustained at 43 mph and gusting to 59 mph at Atlanta’s Hartsfield-Jackson International Airport.įigure 3. Heavy rainbands from Irma continued to sweep across the Southeast late Monday, and additional rainfall could total 2” – 6” across the northern side of Irma’s circulation. Irma will weaken to a tropical depression as it pushes into Alabama on Monday night and Tuesday, and its remnants will slow down and linger through midweek in western Tennessee and Kentucky. Image credit: NOAA Tides and Currents, courtesy Steve Bowen.Īt 8 pm EDT Monday, Irma was located about 120 miles south of Atlanta, with top sustained winds of 45 mph. “If you told me 48 hours ago that the highest US surge from # Irma would be in Fernandina Beach, FL (7.77'), I would have scoffed,” tweeted Steve Bowen (Aon Benfield) on Monday afternoon, September 11. Surge values recorded at various sites affected by Irma over the last few days. Surge values of 2’ – 4’ were still being reported at midday Monday along Florida’s west coast.įigure 2. Irma gave Charleston's historic downtown its third major flood in three years, following Matthew in 2016 and the fringes of Hurricane Joaquin in 2015.Īlong the southwest Florida coast, surge values came in lower than feared, thanks in part to a relatively weak southern half of Irma (the part blowing winds onshore in that region). Unlike Irma, both of those earlier surges in Charleston resulted from direct hurricane hits on South Carolina. 22, 1989, during Hurricane Hugo, and 10.23’ on Aug. At Charleston Harbor, the tidal gauge reading of 9.92’ came in third behind the record of 12.52’ set on Sept. Water flowed over Savannah’s seawall and into downtown streets, and parts of nearby Tybee Island reported flooding worse than during Matthew. The tidal gauge at Fort Pulaski, GA, near Savannah, reached its second-highest value on record (12.24’), just behind the 12.45’ set on Oct. High surge extended well up the Southeast coast on Monday. Image credit: Jacksonville Sheriff’s Office. Downtown Jacksonville at the height of storm surge flooding on Monday, September 11, 2017. At 1:06 pm, the gauge at downtown Jacksonville’s Main Street Bridge showed a water height of 5.57’, smashing the previous modern-day record of 4.12’ observed during Hurricane Dora on Sept. Johns River in Jacksonville spiked dramatically on Monday morning, due in part to runoff from torrential overnight rains of 5” – 15” across northeast Florida (see Figure 3 below). Persistent onshore winds-gusting to 60 mph at Jacksonville’s Naval Air Station at 10 am EDT Monday-converged on the region at midday Monday, pushing water toward the coast as a weakening Irma moved closer to the latitude of the region. The shallow, concave coastline from far northeast Florida to southern South Carolina is highly vulnerable to storm surge. Johns River to heights not seen since 1846. High-water rescues were in progress Monday afternoon in Jacksonville, Florida, where the highest storm surge on record pushed the St. even after being downgraded to a tropical storm on Monday. Hurricane Irma continued to plague residents of the Southeast U.S. Above: Pedestrians walk by a flooded car on a street as storm surge associated with Tropical Storm Irma hits Charleston, S.C., Monday, Sept.
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