184  WTNT33 KNHC 042030 TCPAT3  BULLETIN Hurricane Sam Advisory Number  49 NWS National Hurricane Center Miami FL       AL182021 900 PM GMT Mon Oct 04 2021  ...SAM RACING NORTHEASTWARD OVER THE NORTH ATLANTIC... ...EXPECTED TO TRANSITION INTO A POWERFUL POST-TROPICAL CYCLONE  TONIGHT...   SUMMARY OF 900 PM GMT...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...45.1N 42.5W ABOUT 520 MI...840 KM E OF CAPE RACE NEWFOUNDLAND MAXIMUM SUSTAINED WINDS...90 MPH...150 KM/H PRESENT MOVEMENT...NE OR 35 DEGREES AT 36 MPH...57 KM/H MINIMUM CENTRAL PRESSURE...965 MB...28.50 INCHES   WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect.   DISCUSSION AND OUTLOOK ---------------------- At 900 PM GMT (2100 UTC), the center of Hurricane Sam was located near latitude 45.1 North, longitude 42.5 West. Sam is moving toward the northeast near 36 mph (57 km/h).  This general motion should  continue tonight. A slower east-northeastward motion is forecast to  begin by late Tuesday, and a northeastward motion is expected  Wednesday and Wednesday night.   Maximum sustained winds are near 90 mph (150 km/h) with higher gusts. Although gradual weakening is forecast during the next few  days, Sam is expected to transition into a powerful post-tropical  cyclone over the north Atlantic tonight.  Hurricane-force winds extend outward up to 80 miles (130 km) from the center and tropical-storm-force winds extend outward up to 275 miles (445 km).  The estimated minimum central pressure is 965 mb (28.50 inches).   HAZARDS AFFECTING LAND ---------------------- Key messages for Sam can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC, and on the web at hurricanes.gov/graphics_at3.shtml?key_messages.  SURF:  Swells generated by Sam will impact the northern Leeward Islands, the Greater Antilles, portions of the Bahamas, and southeastern Newfoundland through early Tuesday.  These swells could cause life-threatening surf and rip current conditions. Please consult products from your local weather office.   NEXT ADVISORY ------------- Next complete advisory at 300 AM GMT.  $$ Forecaster Brown