000
WTNT44 KNHC 250839
TCDAT4
 
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
 24H  26/0600Z...DISSIPATED
 
$$
Forecaster Stewart