BOCA RATON, FL (BocaNewsNow.com) — There is still uncertainty but you should definitely have your hurricane plan in place at this point as the 5am update from the National Hurricane Center certainly suggests that South Florida could experience Dorian starting Saturday.
From the National Hurricane Center at 5am:Dorian passed over Barbados a few hours ago and it is now very near the Windward Islands. Data from the Air Force Hurricane Hunters earlier this morning suggest that the storm has held steady in intensity with a blend of the flight level and SFMR winds supporting a wind speed of 45 kt. The Caribbean composite radar data show that Dorian remains a very compact system and that it still lacks a well-defined inner core. Dry air in the mid-levels of the atmosphere around Dorian has been causing the storm to remain in a fairly steady state during the past day or so despite relatively low wind shear conditions and warm SSTs. The models show this dry air persisting in the vicinity of the system while it tracks across the Caribbean during the next day or two, so it seems likely that Dorian will continue to only gradually intensify during that time. When Dorian nears Hispaniola in 36 to 48 hours, there will likely be some increase in wind shear and those less favorable winds aloft and the interaction with the landmasses of Puerto Rico and Hispaniola should cause considerable weakening. Once the system moves north of the Greater Antilles, the environmental conditions become more favorable for intensification, and most of the intensity guidance responds by showing an increase in winds. However, there remains considerable uncertainty for this part of the forecast because the future intensity of Dorian will be quite dependent on how much land interaction there is with the mountainous island of Hispaniola. The NHC intensity forecast lies near the upper end of the guidance in the short term, while the system is over the Caribbean Sea, but near the middle of the guidance envelope after that. The storm is moving west-northwestward at 11 kt steered by a subtropical ridge to the north. This general motion should continue for another 12 to 24 hours taking Dorian across the eastern Caribbean Sea. After that time, a slight turn to the northwest is likely when the cyclone nears the eastern portion of a cut off mid- to upper-level low and moves toward a weakness in the ridge. This should take Dorian across the Dominican Republic and the Mona Passage and over the Bahamas in the 3 to 4 day time period. A ridge is likely to rebuild to the north of Dorian when it is forecast to be over the Bahamas and that could cause it to turn slightly to the left by the end of the forecast period. The new NHC track forecast is largely unchanged while Dorian is in the Caribbean, but it has been shifted slightly to the north thereafter. Users are reminded not to focus on the details of the extended track forecast as the average 5-day track error is around 200 miles. Key Messages: 1. Dorian is expected to bring tropical storm conditions to portions of the Lesser Antilles during the next several hours, where tropical storm watches and warnings are in effect. Rainfall of 3 to 6 inches is expected from Martinique to St. Vincent with isolated totals as high as 10 inches possible. 2. Tropical storm conditions are expected and hurricane conditions are possible in Puerto Rico on Wednesday, where a tropical storm warning and hurricane watch have been issued. Rainfall of 2 to 4 inches with maximum totals of 6 inches are possible across Puerto Rico and St. Croix. 3. Hurricane and Tropical Storm Watches have been issued for portions of the Dominican Republic. 4. While uncertainty remains high, wind and rain impacts are possible in the Bahamas and Florida later this week and this weekend. Residents in these areas should monitor the progress of Dorian and ensure that they have their hurricane plan in place.
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