Tropical Depression Isaac Surface Wind Field
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Miami, Florida—(ENEWSPF)—August 30, 2012 – UPDATE 4 pm CDT (2100 UTC). The National Hurricane Center is reporting that slow-moving Isaac has weakened to a tropical depression over northern Louisiana. Flooding rains continue across southeastern Louisiana and Mississippi. Issac is located about 32.7 north, 92.6 west, about 35 miles (55 km) west-northwest of Monroe, Louisiana, about 40 miles (60 km) south-southeast of El Dorado, Arkansas. Maximum sustained winds are 35 mph (55km/h). Present movement is north-northwest or 335 degrees at 12 mph (19km/h).
Changes in watches and Warnings with this Advisory
All coastal warnings have been discontinued.
Summary of Watches and Warnings in effect:
There are no coastal watches or warnings in effect. For storm information specific to your area, please monitor products issued by your local National Weather Service Forecast Office.
Discussion and 48-hour Outlook
At 400 pm CDT (2100 UTC), the center of tropical depression Isaac was located near latitude 32.7 north, longitude 92.6 west. The depression is moving toward the north-northwest near 12 mph (19 km/h). A turn toward the north is expected by late tonight or early Friday. On the forecast track, the center of Isaac will continue to move over Louisiana today, over Arkansas on Friday, and over southern Missouri Friday night. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Gradual weakening is forecast during the next 48 hours, and Isaac is expected to become a post-tropical remnant low pressure system by Saturday. The estimated minimum central pressure based on nearby surface observations is 995 mb (29.38 inches).
Hazards Affecting Land
Even though Isaac is no longer a Tropical Storm, dangerous hazards from storm surge, inland flooding, and tornadoes are still occurring.
Storm surge. Water levels will remain elevated in southeastern Louisiana and coastal Mississippi through tonight, and gradually subside tomorrow. For information specific to your area, please see products issued by your local Weather Service Office. Based on observations from National Ocean Service tide gauges, at New Canal Station, Louisiana, a storm surge of more than 5 feet is persisting along the southern shore of Lake Pontchartrain, and a storm surge value of near 4 feet continues at Waveland, Mississippi.
Wind. Tropical-storm-force wind gusts could occur along the coasts of southeastern Louisiana and Mississippi through this afternoon.
Rainfall. Isaac is expected to produce total rainfall accumulations of 7 to 14 inches, with isolated maximum amounts of 25 inches possible, over northern and eastern Louisiana, much of Mississippi, southwestern Alabama, Arkansas, and into southern Missouri through Friday. These rains could result in significant lowland flooding. The heavy rain potential will be spreading eastward this weekend into portions of the Mid-west and Ohio valley regions.
Tornadoes. Tornadoes are possible along the central gulf coast region and parts of the lower Mississippi River valley through tonight.
Surf. Dangerous surf and rip current conditions will continue to affect the west coast of Florida and the northern gulf coast through tonight before subsiding on Saturday.
Source: nhc.noaa.gov
