Marco becomes a hurricane as the Gulf Coast braces for 2 cyclones this week
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Marco becomes a hurricane as the Gulf Coast braces for 2 cyclones this week
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Source: CNN
Marco is expected to become a hurricane today 03:11
(CNN)The Gulf Coast will get walloped by a pair of hurricanes this week, bringing torrential rain, fierce winds and ferocious storm surges.
First up: Marco, which strengthened from a tropical storm to a Category 1 hurricane Sunday. Marco is expected to make landfall on the Louisiana coast Monday.
Then there's Tropical Storm Laura, which is also expected to strengthen to a hurricane before it makes landfall in the United States late Wednesday or early Thursday -- also on or near the Louisiana coast.
'Life-threatening storm surge'
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"Ultimately, the big concern is going to be storm surge," CNN meteorologist Allison Chinchar said.
The National Hurricane Center warned of "life-threatening storm surge" as Marco churned closer to the Gulf Coast.
The NHC issued a storm surge warning for coastal cities from Morgan City, Louisiana, east to Ocean Springs, Mississippi.
"A storm surge warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 36 hours," the hurricane center said.
Marco is expected to bring a storm surge height of 4 to 6 feet for Biloxi, Mississippi, and Grand Isle, Louisiana, Chinchar said.
Bowl-shaped New Orleans is at risk
"Since New Orleans is not actually on the coast, it will be more indirectly impacted via Lake Pontchartrain, which is expected to have surge heights of 2 to 4 feet," Chinchar said.
That, combined with 4 to 6 inches of rain, means New Orleans could flood Monday.
"New Orleans is especially at risk because it is essentially shaped like a bowl," Chinchar said.
"Thanks to the drainage system they have set up, the city can act like a colander, allowing water to flow out," she said. "But when it rains a lot in a short period of time the drainage system can become overwhelmed, and that colander acts more like a bowl and floods the city."
Marco and Laura will dump torrential rain
Marco is expected to bring "a tremendous amount of rain, not just to Louisiana, but areas of Mississippi, Alabama and even Florida," Chinchar said.
"Then you have Laura making its way into the Gulf, shortly after Marco makes landfall," she said.
"Even on Monday and Tuesday, Key West, Miami -- you're going to get some of those outer bands from Laura producing very heavy rain and very gusty winds," Chinchar said.
As of Sunday, Laura is over the Dominican Republic, "dumping a tremendous amount of rain there," she said.
By the time Laura reaches the US coast, it's expected to be a Category 2 hurricane -- whipping maximum sustained winds of at least 96 mph.
Laura is expected to impact many of the same areas that Marco will hit.
CNN meteorologist Haley Brink contributed to this report.
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