For info on Laura Click here

As Marco weakens, this will be our final update on yall.com as we turn our 
attention to Laura which is forecast to strengthen to a Cat 2.


BULLETIN
Tropical Storm Marco Special Advisory Number  18
NWS National Hurricane Center Miami FL       AL142020
100 PM CDT Mon Aug 24 2020

...MARCO WEAKENS...
...GUSTY WINDS AND HEAVY RAINFALL STILL POSSIBLE OVER PORTIONS OF
THE NORTHERN GULF COAST THROUGH TONIGHT...


SUMMARY OF 100 PM CDT...1800 UTC...INFORMATION
----------------------------------------------
LOCATION...28.7N 88.6W
ABOUT 40 MI...65 KM SE OF THE MOUTH OF THE MISSISSIPPI RIVER
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NW OR 320 DEGREES AT 6 MPH...9 KM/H
MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

The Tropical Storm Warning and Storm Surge Warning for the U.S. 
Gulf Coast have been discontinued.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

There are no coastal watches or warnings in effect.

Gusty winds, heavy rainfall, and lingering coastal flooding are 
expected from Marco along portions of the Gulf Coast through this 
evening. For information on these hazards see products from your 
local National Weather Service office. 

Tropical cyclone wind and surge watches or warnings are likely to 
be issued for portions of the U.S. Gulf Coast later today for 
Tropical Storm Laura. 

For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.


DISCUSSION AND OUTLOOK
----------------------
At 100 PM CDT (1800 UTC), the center of Tropical Storm Marco was 
located near latitude 28.7 North, longitude 88.6 West. Marco is 
moving toward the northwest near 6 mph (9 km/h). A turn to the 
west-northwest is expected to occur by Tuesday, and this motion 
should continue until the system dissipates in a couple of days.

Aircraft and satellite derived wind data indicate that maximum 
sustained winds are near 40 mph (65 km/h) with higher gusts.
Further weakening is expected, and Marco is forecast to become a 
tropical depression tonight and degenerate to a remnant low on
Tuesday.

Tropical-storm-force winds extend outward up to 80 miles (130 km)
to the northeast of the center over water. A National Ocean 
Service weather station located on Petit Bois Island, Mississippi 
recently reported a wind gust to 35 mph (58 km/h).

The latest minimum central pressure reported by aircraft 
reconnaissance is 1008 mb (29.77 inches).


HAZARDS AFFECTING LAND
----------------------
WIND:  Wind gusts to tropical storm force are possible over the
coastal sections of southeastern Louisiana and Mississippi through
this evening.

RAINFALL:  Marco is expected to produce total rainfall accumulations 
of 2 to 4 inches with isolated maximum amounts of 7 inches across 
portions of the northeast and north-central Gulf coast through 
Tuesday.  This 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 for the next day or so. These swells
are likely to cause life-threatening surf and rip current
conditions.  Please consult products from your local weather office.

TORNADOES:  A couple of tornadoes are possible today into tonight
across the Florida Panhandle, southern Georgia, southern Alabama,
and southern Mississippi.