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Low pressure/tropical wave ’92-L’/‘Potential Cyclone Nine’ was upgraded to tropical storm Isaias Wed. evening while over the Eastern Caribbean.... moved over Eastern Dominican Republic Thu. afternoon then offshore & quickly reorganized becoming the 2nd hurricane of the Atlantic season a little before midnight. Isaias quite literally fell apart Sat. afternoon while crossing Andros Island of the Bahamas & the mid & low level centers have pretty much been disjointed ever since. But at the last minute, Isaias strengthened into a hurricane Mon. evening, Aug. 3rd before coming ashore about 11:15pm EDT near Ocean Isle Beach, NC with max sustained winds near 85 mph & min central pressure of 988mb/29.18″. It’s the fifth season in a row with 2 or more U.S. landfalls & the earliest on record to have 5 named storms hit the U.S. breaking the record of 5 Aug. 18, 1916. Isaias was the 5th July named storm over the Atlantic which ties the record for the month set in 2005. And it marks the fastest to ‘I’ beating the previous record set by “Irene” in - when else - 2005.
Isaias remained reasonably well organized after traversing the rugged terrain of the Dominican Republic Thu. missing some of the highest mountainous peaks. Moving at more than 20 mph, Isaias did not stay over land for much more than 8-10 hours. However, Isaias struggled mightily Sat. afternoon while passing over the N. Andros Island of the Bahamas. At one point, the center was completed exposed & mostly void of convection. But then there was a big burst of t’storms near & north of the center Sat. evening which then gave way to the ongoing west/southwest shear followed by another burst Sunday morning that likewise eventually did succumb to the shear. Vigorous t’storm activity has become persistent since Sunday afternoon but with two centers on radar imagery - a low level circulation closer to the coast & a midlevel circulation to the northeast. The two centers finally “hooked up” allowing for intensification early Mon. evening reaching hurricane strength a few hours before landfall near the S./N. Carolina border.
Isaias raced north/slightly northeast into New York & Western New England before becoming absorbed by a strong nontropical system over SE Canada. Flooding rain & a few tornadoes along with strong & gusty winds accompanied the system all the way north into Canada.
The graph & map below - the next 2 images - courtesy Dr. Phil Klotzbach showing Aug. landfalling hurricanes:
Meanwhile... a tropical wave has limited potential to develop some over the Central Atlantic while holding nearly stationary or drifting some to the west. Significant development does not appear likely.
One area to keep an eye on in the long run might be the NW Caribbean &/or Southern/SW Gulf of Mexico. Tropical waves are marching west at fairly low level latitudes driven by the strong Bermuda high, & we might see “late bloomer” by mid month.
And t.d. #10 formed just off the coast of Africa Fri. over the far E. Atlantic but has dissipated.