CURRENT TROPICAL CYCLONES:
Post-Tropical Cyclone 18L (Sam)…is located about 690 miles east-northeast of Cape Race, Newfoundland – Last Advisory
Post-Tropical Cyclone 18L (Sam) – Last Advisory
SAM TRANSITIONS TO A POWERFUL POST-TROPICAL CYCLONE OVER THE FAR NORTH ATLANTIC BETWEEN NEWFOUNDLAND AND ICELAND
According to the NHC Advisory 51…The post-tropical cyclone is moving toward the north near 23 mph (37 km/h), and this general motion should continue today with a further decrease in forward speed. A slow east-northeastward motion is forecast to begin by late today, and a northeastward motion is expected Wednesday and Wednesday night.
Maximum sustained winds have decreased to near 80 mph (130 km/h) with higher gusts. Although gradual weakening is forecast during the next few days,
Sam is expected to remain a powerful post-tropical cyclone over the north Atlantic today.
Hurricane-force winds extend outward up to 80 miles (130 km) from the center and gale-force winds extend outward up to 460 miles (740 km).
HAZARDS AFFECTING LAND
SURF: Swells generated by Sam will impact the northern Leeward Islands, the Greater Antilles, portions of the Bahamas, and southeastern Newfoundland through midweek. These swells could cause life-threatening surf and rip current conditions.
A large area of disorganized showers and thunderstorms is located east of a surface trough that extends from the central and southeastern Bahamas northward over the adjacent southwestern Atlantic waters.
Upper-level winds are not expected to be favorable for significant tropical development of this system while it moves slowly northwestward over the next several days.
By this weekend, the system is forecast to interact with a front near the coast of the southeastern United States.
* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 5 days…low…10 percent