CHANGES WITH THIS ADVISORY:

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

There are no coastal watches or warnings in effect.

RAINFALL: Marco is expected to produce additional rainfall accumulations of 1 to 3 inches with additional isolated totals of 5 inches across portions of the northcentral Gulf coast and Southeastern United States through Wednesday. Rain totals related to Marco near Apalachicola, Florida reached as high as 11.81 inches on Sunday per a CoCoRaHS report. The additional rainfall may result in areas of flash, urban and small stream flooding along the same area.

SURF: Swells generated by Marco are likely to affect portions of the northern Gulf Coast overnight. These swells are likely to cause lifethreatening surf and rip current conditions. Please consult products from your local weather office.

TORNADOES: A brief tornado or two remains possible overnight across the Florida Panhandle, southwest Georgia, far southern Alabama, and far southern Mississippi.

At 1000 PM CDT (0300 UTC), the center of Tropical Depression Marco was located near latitude 29.0 North, longitude 89.8 West. The depression is moving toward the west near 9 mph (15 km/h). Marco is forecast to continue moving westward near the coast of Louisiana for the next day or so.

Maximum sustained winds have decreased to near 35 mph (55 km/h) with higher gusts. Additional weakening is expected, and Marco is forecast to become a remnant low on Tuesday. The system is then forecast to dissipate by early Wednesday.

The estimated minimum central pressure is 1007 mb (29.74 inches).

Visible imagery and surface observations indicated that Marco made landfall around 6 pm CDT near the mouth of the Mississippi River. Shortly before landfall, reports from an Air Force Reserve Hurricane Hunter plane indicated that Marco was still producing a small area of tropical-storm-force winds over water to the northeast of its center. Since then, the system has moved almost due west along the southeast coast of Louisiana while its deep convection has become farther displaced from the low-level center. Between the lack of central convection and Marco's proximity to land, it is likely that the winds have decreased since earlier this evening and the intensity has been lowered to 30 kt.

If deep convection does not redevelop overnight, Marco will become a remnant low as soon as Tuesday morning. Regardless of its status, Marco should move generally westward near the coast of Louisiana while it weakens for the next day or so and could continue to produce heavy rain for portions of the north-central Gulf Coast tonight. The system is then forecast to dissipate by early Wednesday, if not sooner.