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Tropical Storm Marco Advisory Number 19
NWS National Hurricane Center Miami FL AL142020
400 PM CDT Mon Aug 24 2020
...MARCO EXPECTED TO CONTINUE TO PRODUCE GUSTY WINDS AND HEAVY
RAINFALL OVER PORTIONS OF THE NORTHERN GULF COAST THROUGH THIS
SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION
ABOUT 15 MI...20 KM ESE OF THE MOUTH OF THE MISSISSIPPI RIVER
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NW OR 320 DEGREES AT 7 MPH...11 KM/H
MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
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 have been issued for
portions of the U.S. Gulf Coast 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 400 PM CDT (2100 UTC), the center of Tropical Storm Marco was
located near latitude 29.0 North, longitude 88.9 West. Marco is
moving toward the northwest near 7 mph (11 km/h), a turn to the
west-northwest and a slight increase in forward speed is expected
to occur tonight. On the forecast track, Marco will move inland
over southeastern Louisiana tonight, and across southern Louisiana
Maximum sustained winds are near 40 mph (65 km/h) with higher gusts.
Weakening is expected, and Marco is forecast to become a
tropical depression tonight and degenerate to a remnant low on
Tropical-storm-force winds extend outward up to 80 miles (130 km)
from the center. A National Ocean Service weather station located
on Petit Bois Island, Mississippi recently reported a wind gust to
38 mph (61 km/h).
The estimated minimum central pressure 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
RAINFALL: Marco is expected to produce additional rainfall
accumulations of 2 to 4 inches with additional isolated totals of 7
inches across portions of the north-central 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
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 late this afternoon
through tonight across the Florida Panhandle, southern Georgia, far
southern Alabama, and far southern Mississippi.
Next complete advisory at 1000 PM CDT.