Category 4 again, possible formation of tropical depressions


The National Hurricane Center tracks four systems in the Atlantic, including Hurricane Sam, which again strengthened to become a Category 4 hurricane.

AccuWeather forecasters said Sam is expected to miss a direct impact on the United States, however, significant swells are expected to reach the US east coast and Atlantic Canada by this weekend. Swells will likely result in potentially life-threatening surf and tear conditions, according to the NHC.

There are also three other systems in the Atlantic that are expected to become tropical depressions within days.

The last two names on the 2021 Atlantic hurricane list are Victor and Wanda.

Here is the latest NHC news for Tuesday at 5 a.m.:

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Impact on the United States? :Hurricane Sam intensifies to Category 4 with winds of 150 mph. Will it be close to the United States?

What is there and where are they?

Hurricane Sam: Sam is located 610 miles east of the Leeward Islands or 1,796 miles east of West Palm Beach.

Disturbance 1: A large area of ​​low pressure several hundred miles southwest of the Cabo Verde Islands produces a large area of ​​disorganized showers and thunderstorms.

Disturbance 2: A tropical wave over the far eastern tropical Atlantic several hundred kilometers southeast of the Cabo Verde Islands continues to produce a large area of ​​disorganized showers and thunderstorms.

Disturbance 3: A well-defined area of ​​low pressure associated with Peter’s remains is located a few hundred miles east of Bermuda. The downpour and thunderstorm activity associated with this system has become less organized since Monday morning.

Tropics 5 a.m. on September 28, 2021.

What is the likelihood that they will reinforce each other?

Hurricane Sam: Sam is a Category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some fluctuations in intensity are expected over the next few days, but Sam is expected to remain a major hurricane until the end of this week.

Hurricane force winds extend outward up to 40 miles from the center and tropical storm force winds extend outward up to 125 miles.

Disturbance 1: Environmental conditions are favorable for further development, and a tropical depression is likely to form over the next two days as the system moves from west to west-northwest at a speed of 5 to 10 mph above. over the central tropical Atlantic.

  • Chance of training in 48 hours: high, 70%.
  • Chance of training over 5 days: high, 90%.

Disturbance 2: Upper winds are conducive to gradual development, and a tropical depression is likely to form within a day or two as the disturbance moves from west to west-northwest at a speed of 10 to 15 mph over the extreme east of the tropical Atlantic.

  • Chance of training in 48 hours: high, 70%.
  • Chance of training over 5 days: high, 90%.

Disturbance 3: Although strong upper winds are likely to preclude significant development, this system could still become a short-lived tropical depression later today or overnight as it moves northeast at around 10 mph. By Wednesday, however, conditions are expected to become unfavorable for further development.

  • Chance of training in 48 hours: average, 50%.
  • Chance of training over 5 days: average, 50 percent.

Hurricane Sam Details

  • Site: 610 miles east of the Leeward Islands or 1,796 miles east of West Palm Beach
  • Maximum sustained winds: 130 mph
  • Direction: northwest at 9 mph

Who is likely to be impacted?

Hurricane Sam: Heavy swells generated by Sam are affecting the Leeward Islands and will spread to parts of the Virgin Islands, Puerto Rico, Hispaniola, Bahamas and Bermuda by Thursday or Friday.

Significant swells are likely to reach the eastern seaboard of the United States and Atlantic Canada by the weekend. These swells will likely result in potentially life-threatening surf and rip conditions.

It is too early at the moment to determine if the other disturbances in the Atlantic will have an impact on the United States.

Forecasters urge all residents to continue monitoring the tropics and always be prepared during what is expected to be an active hurricane season.

Tropical monitoring in real time:

These graphs, which update automatically, show you activity in the tropics in real time:

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