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Post-Tropical Cyclone Marco Discussion Number 21
NWS National Hurricane Center Miami FL AL142020
400 AM CDT Tue Aug 25 2020
Marco has been devoid of any significant convection for at least
12 hours, and ASCAT scatterometer surface wind data around 0239Z
suggested that Marco might have degenerated in a north-to-south
elongated trough. Based on this information, Marco has been
downgraded to post-tropical remnant low. Brisk southwesterly
vertical wind shear of 30 kt is forecast to increase to near 35 kt
in 24 hours, which should prevent the redevelopment of deep
convection near the center.
Marco's remnants are expected to move generally westward along or
just south of the southern coast of Louisiana for the next 24 hours
or until dissipation occurs.
This is the last forecast/advisory issued by the National Hurricane
Center on Marco. Additional information on this system can be found
in high seas forecasts issued by the national weather
service...under AWIPS header NFDHSFAT1 and WMO header FZNT01 KWBC.
FORECAST POSITIONS AND MAX WINDS
INIT 25/0900Z 28.8N 91.2W 25 KT 30 MPH...POST-TROP/REMNT LOW
12H 25/1800Z 28.8N 92.7W 20 KT 25 MPH...POST-TROP/REMNT LOW