At that point, it will no longer be a tropical system. To be classed as a hurricane there must be one-minute maximum sustained winds of at least 74 miles per hour to be classed as a category one, or more than 156 miles per hour to be classed as a category five.
Storm chances are on the rise through mid-week as the remnants of Barry turn towards the Ohio Valley.
And it's not even close to done.
The heaviest rain is forecast just to the east of Barry's track and up to 6 to 12 inches of rain could fall in the south central Louisiana, where there is a high risk of flash flooding.
The afternoon scattered storm threat continues on Monday and Tuesday with otherwise partly cloudy skies.
The level of the Mississippi River, already swollen from historic rains and flooding upstream, was at almost 17 feet (5.2 meters) in New Orleans - just below flood stage.
The center of what's left of Barry should move into the Midwest by Tuesday evening, with heavy rains expected from Tennessee into IL and Indiana.
Barry was expected to continue weakening and become a tropical depression Sunday, moving over Arkansas on Sunday night and Monday.
Louisiana's governor urged residents to stay alert and follow any orders from officials.
'Our greatest concern is for torrential rain that would result in life-threatening flooding, ' AccuWeather Hurricane Expert Dan Kottlowski said.
The National Weather Service (NWS) earlier warned the Mississippi River could crest at 19ft or 20ft during the storm, but on Friday revised their estimate down to 17ft.
"This was a storm that clearly could have turned out differetly, in an unexpected way", he said. "They just don't hold".
Residents in New Orleans fortified their homes and stocked up on supplies as Barry began to roll in from the Gulf of Mexico. And his family, including four children, were stranded in their home.
Others, like Ollie and Hazel Jordan, have struggled to find a place where both they and their pets can be safe.
They have been conducting volunteer rescues since Hurricane Katrina in 2005, and were equipped with five flat-bottom rescue boats, a high-clearance, military-style truck and 86 boats staged in the region in preparation for the latest storm. That led to tragic outcomes.
AccuWeather Extreme Meteorologist Reed Timmer captured footage of water overtopping a levee in St Mary Parish.
At 8 p.m. Sunday, the Flood Protection Authority said field crews will reopening key floodgates in areas of the St. Bernard Parish and the Orleans Parish to assist with rail, emergency routes and river commerce.
Officials said an estimated 400 people were ordered evacuated in Terrebonne Parish, which is about 100 kilometers (62 miles) southwest of New Orleans. But that doesn't mean Barry is done thrashing the Big Easy.
New Orleans saw light rain on Sunday morning, and churches and several businesses were open, including some on Tchoupitoulas Street along the flooded Mississippi River. Highs Thursday into next weekend will climb back into the 90s.
Due to recent flash-flooding and heavy rainfall, there was a particular risk of flooding for low-lying New Orleans.
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