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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 24H 26/0600Z...DISSIPATED $$ Forecaster Stewart

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