Tropical Cyclone 18L (Sam)…is located about 1560 miles east-southeast of the northern Leeward Islands
Tropical Cyclone 18L (Sam)
SMALL SAM RAPIDLY INTENSIFYING…RAPID INTENSIFICATION FORECAST TO CONTINUE THROUGH SATURDAY
According to the NHC Advisory 6…Sam is moving toward the west near 15 mph (24 km/h), and this motion with a decrease in forward speed is expected through Saturday. A motion toward the west-northwest at an even slower forward speed is expected late Saturday into Sunday.
Sam is rapidly intensifying, and maximum sustained winds have increased to near 70 mph (110 km/h) with higher gusts. Rapid intensification is forecast to continue through early Saturday.
Sam is likely to become a hurricane very soon and then could be a major hurricane by Friday night or early Saturday. Sam is a small tropical storm.
Tropical-storm-force winds extend outward up to 45 miles (75 km) from the center.
A gale-force, non-tropical low pressure system, the remnants of Odette, is located a little more than 600 miles west-northwest of the westernmost Azores.
Showers and thunderstorms remain limited near the low, and this system has only a brief window of opportunity to become a subtropical or tropical cyclone while it moves generally south-southeastward over marginally warmer waters during the next day or so.
Strong upper-level winds are expected to develop over the system beginning tomorrow, which should then limit further development.
* Formation chance through 48 hours…medium…50 percent
* Formation chance through 5 days…medium…50 percent
>>> A large area of showers and thunderstorms located a few hundred miles southeast of Bermuda is associated with a surface and upper-level trough.
Some tropical or subtropical development of this system could occur in the next day or two as it moves generally north-northwestward.
Strong upper-level winds should prohibit further development by this weekend.
A tropical wave is expected to move off the west coast of Africa by the end of this weekend.
Thereafter, environmental conditions are forecast to be conducive for gradual development of this system as it moves westward at 10 to 15 mph over the far eastern tropical Atlantic.
* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 5 days…low…30 percent