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Hurricane watches and warnings were posted from Intracoastal City, Louisiana, to the Mississippi-Alabama border. The Suomi-NPP satellite also captured this nighttime view of the storm around midnight on August The storm was moving northwestward toward the mouth of the Mississippi River at 10 miles 17 kilometers per hour, with maximum sustained winds of 75 miles kilometers per hour.
Hurricane-force winds extended 60 miles 96 kilometers from the center. NHC forecasters expected Isaac to strengthen a bit before reaching shore, and warned of potential flooding from rainfall of 7 to 14 inches 18 to 36 centimeters , with localized precipitation up to 20 inches 50 centimeters. They also warned of a storm surge that could reach 6 to 12 feet 2 to 3. The five-day forecast suggested that the hurricane and its remnants would head straight up the Mississippi River basin and perhaps to the Ohio River—potentially offering some relief in areas where the river has been exceptionally low.
But the heavy rains could also provoke severe flooding, as the parched ground and dried up crops will not necessarily absorb that much water. NASA is just days from launching an intensive multi-year study of hurricane formation and evolution in the Atlantic Ocean. Tropical Storm Isaac then tracked northwest across the eastern Gulf of Mexico late on the 27th and early on the 28th. On the afternoon of August 28th, Isaac strengthened to a hurricane with winds of 80 mph just off the southeast Louisiana coast approximately 75 miles south-southeast of the mouth of the Mississippi River.
At pm on August 28th, Hurricane Isaac made a brief landfall along the coast of southeast Louisiana in Plaquemines Parish.
Maximum sustained winds were 80mph during landfall. Isaac did not remain over land for long as the hurricane was back over water again by 9pm that same evening. Hurricane Isaac made a 2nd landfall along the coast of southeast Louisiana just west of Port Fourchon around am on August 29th, again with maximum sustained winds of 80mph.
The radar loop above shows the progression of Hurricane Isaac courtesy of University of Alabama in Huntsville. As the inner core of Isaac moved very slowly north across central Louisiana over the course of August 29th and 30th, the outer bands of the hurricane lifted northward across portions of southeast Mississippi, southwest Alabama, and the western Florida panhandle.
The slow movement of Isaac resulted in prolonged wind, coastal flooding and flash flooding impacts across the entire region. Overall the region fared well with regard to impacts from Hurricane Isaac. Heavy flooding rains, especially over southeast Mississippi; and minor to moderate coastal flooding and erosion were the primary problems. No injuries were reported in association with Hurricane Isaac across the area.
One indirect death was reported in Escambia County, FL when a man drowned in the increasingly rough surf while attempting to ride a JetSki on August 27th as Isaac began moving north across the Gulf. Hurricane Isaac did not directly hit our area, but significant impacts were felt across the region. The majority of this document will focus on the impacts from flooding across southern Alabama and southern Mississippi.
Below are some of the regional impacts Although Isaac weakened in intensity as it moved inland, the movement of the storm slowed to around 5 mph. This slow down resulted in prolonged excessive rainfall and resultant flooding across southwest Alabama and southeast Mississippi.
The heaviest, most persistent rainfall occurred on the evening of August 29th. Radar storm total estimates of inches of rain fell over parts of the region, especially over southeast Mississippi. Radar estimates from KMOB radar can be seen in the image to the right.
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