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Isaac Brings Flooding, Severe Threat to Miss. Valley

UPDATED 8 PM CDT, September 1, 2012

UPDATED By WeatherBug Meteorologist, John Bateman

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Even though Isaac is no longer a tropical threat, it`s still haunting the Mississippi Valley with drenching downpours and the potential for severe afternoon storms. Drought-relieving rain will be a welcomed sight, but too much at one time will ratchet up the flood threat from Missouri to Ohio.

As if that weren`t enough, a few severe thunderstorms will pepper the eastern Missouri Valley, Arkansas and southwestern Illinois. As Isaac`s remnant circulation interacts with daytime heating, thunderstorms with potential for damaging winds and tornadoes will develop.

Because of this, Tornado Watches have been issued from central Illinois to eastern Arkansas. These watches include places like Poplar Bluff, Mo., Paducah, Ky., Peoria, Ill., Little Rock, Ark., and Memphis, Tenn., with a Severe Thunderstorm Watch in central and southern Arkansas, northern Mississippi and southern Tennessee.

A low pressure system consisting of Isaac`s remnants will slowly crawl east, with a cold front stretching to its south. The low is drawing a deep fetch of tropical moisture northward from the Gulf of Mexico into the eastern Mississippi and Ohio valleys. This is bringing plenty of heavy rain into the eastern half of the U.S.

The silver lining is the Missouri and Ohio valleys sorely need the rainfall, reeling from a growing drought responsible for snapping numerous long-standing record highs from Missouri to Ohio this summer. The flip of the coin is too much rain in a short amount of time may cause flash flooding, especially in areas of poor drainage or where storm drains are clogged or flow is disrupted. Remember, if you approach a flooded roadway, it`s best to "Turn Around, Don`t Drown."

Isaac`s remnants will squeeze out impressive rainfall amounts through early next week. Today alone, a reporting station in Bloomington, Ill., recorded 3.18 inches of rain. The highest totals will be found along Interstate 70 in the Midwest where 4 inches are possible. A broad swath of 1 to 2.50 inches will drench large stretches of the Tennessee Valley and Mid-Atlantic.

What`s more, Isaac will still pack a punch of gusty winds for the extended Labor Day holiday weekend. A Lake Wind Advisory is in place today and Sunday across southeastern Missouri, southern Illinois, southwestern Indiana, and western Kentucky. Here, southerly breezes sustained at 15 to 20 mph with gusts up to 30 mph will create choppy waters and potential boating hazards for those enjoying holiday festivities.

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