CURRENT TROPICAL CYCLONES:
Tropical Cyclone 18L (Sam)…is located about 610 miles east of Cape Race, Newfoundland
Tropical Cyclone 18L (Sam)
SAM STILL A HURRICANE BUT EXPECTED TO TRANSITION INTO A POWERFUL POST-TROPICAL CYCLONE SOON
According to the NHC Advisory 50…Sam is moving toward the north-northeast near 29 mph (46 km/h). This general motion should continue overnight with a 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 85 mph (140 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 within the next 6-12 hours. Hurricane-force winds extend outward up to 80 miles (130 km) from the center and tropical-storm-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, the Bahamas, the eastern United States and Atlantic Canada for the next couple of days. These swells could cause life-threatening surf and rip current conditions.
A large area of disorganized showers and thunderstorms continues over the southeastern Bahamas and adjacent southwestern Atlantic waters in association with a surface trough. 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 merge 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