Tropical showers are expect to pick up in intensity across parts of the Gulf Coast Friday. Some of these tropical rain showers could have rainfall rates of 2 to 3 inches per hour, and could spawn tornadoes. The risk for tornadoes will increase during the evening hours as Barry comes closer to the shoreline -- especially over southern Louisiana and parts of southern Mississippi.

Storms have already soaked parts of the coast. Downtown New Orleans received 6.27 inches of rain on Wednesday and much more is expected as the storm gets closer to shore.

The Mississippi River is expected to rise to about 19 feet on Saturday, according to the National Weather Service, which would test levees in New Orleans.

\"PHOTO:
ABC News
PHOTO: Barry is forecast to make landfall in southern Louisiana early Saturday.
>

Towns along the coast are beginning to issue evacuation orders. Mandatory evacuations were issued for Grand Isle on Thursday, while a recommended evacuation order was given for Port Fourchon. Plaquemines Parish had already received evacuation orders on Wednesday.

Storm surge will begin to increase in parts of southern Louisiana throughout Friday, as winds begin to push water up against the shoreline. The surge will likely reach its maximum during the evening and overnight hours, and during the high tide cycles. Winds will increase in southern Louisiana throughout the day, occasionally gusting over 50 mph, which could cause scattered downed trees and power outages.

Landfall is only the beginning of the main impacts from this tropical system.

\"There are three ways that Louisiana can flood: storm surge, high rivers and rain,\" Edwards said on Thursday. \"We're going to have all three.\"

\"PHOTO:
ABC News
PHOTO: The storm will strengthen as it nears the coast on Friday afternoon and evening.
>

Barry will bring an onslaught of torrential rain leading up to, during, and after landfall. The heavy rain will fall directly east of the center of the storm. Rainfall rates of 2 to 3 inches per hour on Saturday will lead to widespread flash flooding.

As much as 15 to 25 inches of rain is possible in the bands directly east of the center of the storm. This will lead to life-threatening and potentially disastrous flooding in parts of Louisiana.

Some of the heavy rain will also spread into parts of Arkansas and Mississippi late in the weekend and early next week.

\"PHOTO:
ABC News
PHOTO: The storm will likely make landfall early Saturday.
>

Louisiana had record flooding in August 2016, when torrential rain, fed by deep tropical moisture, caused rainfall of 20 to 30 inches in parts of southern Louisiana and Mississippi from Aug. 11 to 13.

There were 13 people killed during that period as flash flooding was reported as well as record river flooding. An estimated 50,00 to 75,000 structures flooded during this three-day time period, along with the closures of major interstates.

Experts point to the record flooding in August 2016 as an example of how damaging disastrous floods can be, even if they don't reach the level of being a named tropical storm.

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