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  • My Personal Weatherman (Mike Lani)

Hurricane Isaias 8 AM Update


- The National Hurricane Center advisory is below, but I think there is an increasing chance that it may track a little farther west than the black line in the 1st image. There has been a westward shift in the GFS, Euro, HWRF, and HWRF-Parallel. Always pay attention to the official NHC forecast, but the implications for a westward shift would be more impact for the east coast of Florida, a potential landfall near the SC/NC border, more time over land before getting to or near Long Island. Let's see what the NHC shows in their 11 AM update. I will post the new 06Z Euro ensembles when they come out around 9:30 AM.


From the NHC: At 800 AM EDT (1200 UTC), the center of Hurricane Isaias was located by NOAA and Air Force Reserve Hurricane Hunter aircraft near latitude 21.3 North, longitude 73.9 West. Isaias is moving toward the northwest near 17 mph (28 km/h), and a generally northwestward motion with some decrease in forward speed is expected for the next couple of days followed by a turn toward the north-northwest. On the forecast track, the center of Isaias will move near or over the Southeastern Bahamas today. Isaias is forecast to be near the Central Bahamas tonight, and move near or over the Northwestern Bahamas and be near or east of the Florida peninsula on Saturday and Sunday.


Maximum sustained winds are near 80 mph (130 km/h) with higher gusts. Some strengthening is possible today, and Isaias is expected to remain a hurricane for the next few days.

Hurricane-force winds extend outward up to 45 miles (75 km) from the center and tropical-storm-force winds extend outward up to 205 miles (335 km). A private weather observing site at Long Bay Beach in Providenciales recently reported a sustained wind of 55 mph (86 km/h) and a gust to 59 mph (95 km/h).


Reports from the reconnaissance aircraft indicate that the minimum central pressure is 990 mb (29.24 inches).


HAZARDS AFFECTING LAND


STORM SURGE: A dangerous storm surge will raise water levels by as much as 3 to 5 feet above normal tide levels in areas of onshore winds in the Bahamas.


WIND: Tropical storm conditions will continue across portions of the Dominican Republic and the Turks and Caicos this morning. Hurricane conditions are expected to begin in the southeastern Bahamas this morning and spread into the central and northwestern Bahamas tonight and into Saturday. Tropical storm conditions are possible in the watch area in Florida beginning Saturday.


RAINFALL: Isaias is expected to produce the following rain accumulations through Saturday:


Dominican Republic and northern Haiti: 4 to 8 inches, with isolated maximum totals of 12 inches.


Bahamas, Turks and Caicos: 4 to 8 inches.


Cuba: 1 to 2 inches, with isolated maximum totals of 4 inches.


These rainfall amounts will lead to life-threatening flash flooding and mudslides, as well as river flooding. Urban and small stream flooding is expected for the U.S. Virgin Islands and Hispaniola.


From Friday night through Monday:


South Florida into east-Central Florida: 2 to 4 inches, with isolated maximum totals of 6 inches.


These rainfall amounts could result in isolated flash and urban flooding, especially in low-lying and poorly drained areas.


Heavy rains associated with Isaias may begin to affect the eastern Carolinas by early next week. This rain could result in isolated flash and urban flooding, especially in low-lying and poorly drained areas, as well as isolated minor river flooding.


SURF: Swells generated by Isaias are affecting portions of Puerto Rico, the Dominican Republic, the Turks and Caicos Islands and the southeastern Bahamas. These swells will spread along the coast of Cuba and into the central and northwestern Bahamas later today and along the east coast of Florida on Saturday. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office.




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