The eye of Hurricane Dorian passed over Cape Hatteras, North Carolina, earlier today which makes it the the first (and only) landfall by this storm on the US mainland. It made landfall on the Outer Banks as a category 1 hurricane with maximum sustained winds at 90 mph and is the first landfall by a hurricane in North Carolina since Arthur in 2014. The storm has begun an acceleration to the northeast in recent hours as it is increasingly being influenced by an approaching upper-level trough. There is still some impact being felt in coastal sections of the Mid-Atlantic and southern New England where heavy rain bands are rotating around Hurricane Dorian.
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Hurricane Dorian has regained some strength in the overnight hours and has been re-classified as a “major” category 3 storm with maximum sustained winds at 115 mph. It is moving slowly to the NNE at 8 mph and is currently just off the coast of South Carolina. There will be a major impact over the next 24 hours by Hurricane Dorian in the coastal Carolinas in places like Charleston, South Carolina and Wilmington and the Outer Banks in North Carolina. By mid-day Friday, Hurricane Dorian will be near the Outer Banks of North Carolina and it will become increasingly influenced by an advancing upper-level trough over the Great Lakes. As a result, Hurricane Dorian will accelerate to the northeast on Friday and pass well to the east of the Mid-Atlantic, but some impacts are likely that will in many ways resemble a “nor’easter” with the greatest impacts along coastal sections. Looking ahead, by no means does it look like the Atlantic Basin tropical season will slow down with the departure of Hurricane Dorian as numerous tropical waves are lining up over the continent of Africa.
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Hurricane Dorian remains a category 2 storm at midday and it has picked up a bit of forward speed now moving NNW at 9 mph with 105 mph maximum sustained winds and a central pressure of 964 millibars. Gusty squalls are rotating around Hurricane Dorian and impacting much of the coastal region in northeastern Florida as well as coastal sections of Georgia, South and North Carolina. Hurricane Dorian is likely to at least maintain its category 2 strength as it moves closer to the Carolina coastline and it very well could undergo some intensification as it heads over warmer waters of the Gulf Stream and leaves “upwelling-induced” cooler water behind. By early Friday, Hurricane Dorian will move to a position over the Outer Banks (NC) and will become increasingly influenced by an advancing trough of low pressure in the upper atmosphere. This upper-level feature will cause it to accelerate to the northeast passing well to the east of the Mid-Atlantic region on Friday, but important impacts are still on the table for coastal sections.
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Hurricane Dorian has finally resumed some movement today as the latest measurements have it moving to the northwest at 2 mph after being stationary for nearly 24 hours. From later today into Wednesday, Hurricane Dorian should turn north-northwest and run parallel to the east coast of Florida as it picks up some forward speed. It’ll then close in on the Carolina coastline by Thursday where it is not out of the question that it makes a landfall somewhere on its way to the Outer Banks (North Carolina). After that, Hurricane Dorian will likely pass well to the east of the Mid-Atlantic coastline from Thursday night into Friday with its greatest impact limited to coastal sections.
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Major Hurricane Dorian is now a category 5 storm and continues to be a significant threat to Florida and the to rest of the US east coast. It is now moving westward at 8 mph with max sustained winds at 160 mph and is approaching the northwestern Bahamas. By tomorrow, powerful Dorian will be slowing down to a crawl as it crosses over the NW Bahamas and closes in on the east coast of Florida. Later tomorrow and Tuesday, as Dorian makes its closest approach to the east coast of Florida, the hurricane will begin a turn toward the northwest/north and likely begin to move parallel to the coastline. Since there is still some uncertainty with the track forecast and a slight shift will make a huge difference, the eastern part of Florida remains under the threat of direct impacts from Dorian; especially, near the coastline. Later in the week, Dorian is likely to take a ride up along the east coast impacting the coastal Carolinas and perhaps eventually impacting the Mid-Atlantic region and New England.
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A serious weather situation continues to unfold as Hurricane Dorian intensifies and continues on a path towards the Bahamas and Florida with possible landfall later Monday into Tuesday. Hurricane Dorian has reached category 2 status as of early Friday morning and could reach “major” hurricane status (i.e., category 3) later in the day. High pressure ridging in the upper part of the atmosphere is a key player in the intensification and movement of Hurricane Dorian and it should result in additional strengthening over the next couple of days – perhaps to category 4 status.
As Hurricane Dorian nears the northwestern Bahamas later this weekend, the upper-level ridge will tend to weaken and this is likely to result in a slowing down of the system. The weakening ridge may also allow for a turn to the northwest as Hurricane Dorian approaches Florida and then a turn to the north and northeast once near or just over land. This could very well result in a slow trek up along the eastern seaboard later next week; in other words, we may still be talking about Hurricane Dorian a week from now.
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Hurricane Dorian continues to move to the northwest and is still categorized as a category 1 storm with max sustained winds at 85 mph. There have been intermittent signs of a small inner eye in satellite imagery during the past few hours. As atmospheric and oceanic conditions become more favorable over the next few days, Dorian is likely to strengthen into “major” hurricane status as it begins a shift from northwest-to-west with intensifying upper-level ridging to the north. On this track, Dorian would approach the east coast of Florida on Monday or Tuesday – likely as a “major” – but all residents from the Carolinas to Georgia have to stay on guard as a last minute turn to the northwest/north cannot be ruled out before it ever even reaches Florida.
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All residents from North Carolina to Florida should closely monitor Tropical Storm Dorian over the next few days as it can have a major impact by later this weekend or early next week in any part of this region. Tropical Storm Dorian has strengthened over the past 12-18 hours and has effectively fought off dry air over the Caribbean Sea. In addition, the current track will take the storm over Puerto Rico and the Virgin Islands in the near term – largely avoiding the island of Hispaniola which could have resulted in substantial weakening given its rugged terrain. Once TS Dorian makes it past the Caribbean islands and into the southwestern Atlantic, it’ll move over very warm waters and encounter more favorable environmental conditions (e.g., low wind shear) for intensification. If TS Dorian doesn’t reach hurricane status in the next several hours, it is very likely to in the next day or two once out over the southwest Atlantic Ocean and “major” (category 3+) hurricane status is certainly on the table in a few days.
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Tropical Storm Dorian has been relatively stable over the past 24 hours in terms of intensity and it moved directly over the center of St. Lucia earlier today. The track of the tropical storm will likely bring it right near the area between Puerto Rico and Hispaniola over the next day or two and it will encounter some dry air along the way. After an encounter with these two Caribbean islands, whatever remains of TS Dorian will likely push to the Bahamas later this week and then ultimately to Florida during the upcoming holiday weekend.
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After a quiet start to the month in terms of Atlantic Basin tropical activity, the last week of August is beginning with one tropical system over the western Atlantic Ocean and a tropical storm nearing the Caribbean Sea. Tropical Storm Dorian is fast approaching the Windward Islands and it could become a hurricane once over the warm waters of the eastern Caribbean. There is currently some dry air over the Caribbean Sea out ahead of Tropical Storm Dorian which could limit its intensification prospects later in the week and its ultimate track will be quite crucial. A track over the rugged terrain of Hispaniola Island, for example, would likely weaken the system, but that is not a certainty at this point. Finally, the eventual path and intensification of the initial tropical system over the western Atlantic could, in turn, have an impact on TS Dorian depending on its movement and development in coming days.
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