Hazardous Weather Outlook issued for Long Island as Hurricane Isaias poses threat

HOLBROOK, NY (OnSachem.com / OnTownMedia.com) — Hurricane Isaias may begin to impact Long Island as early as Monday night.

The National Weather Service forecast office for New York based in nearby Upton has issued a Hazardous Weather Outlook for our area as Hurricane Isaias poses an increasing threat to Long Island early next week.

“While it’s too early to provide any specific details on the impacts from the storm, it needs to be closely monitored,” according to National Weather Service forecast office in New York. “Potential impacts during the Monday night to Wednesday time period include heavy rainfall and gusty winds, coastal flooding, and hazardous surf.”

Isaias is a Category 1 hurricane with maximum sustained winds of 85 miles per hour as of 5 a.m. Saturday. Hurricane conditions from Isaias are expected along parts of the Florida east coast Saturday afternoon through Sunday, as Hurricane Warnings are in effect. Expect damaging winds, dangerous storm surge, heavy rainfall and isolated flood and urban flooding.

New York Governor Andrew Cuomo has directed state agencies to prepare and pre-deploy emergency response assets ahead of Hurricane Isaias potentially impacting the region. 

"I have directed our emergency response agencies to pre-deploy assets as we closely monitor this Category 1 hurricane that is currently expected to sweep up the East Coast," Cuomo said. "New Yorkers are far too familiar with the destructive powers of these storms, and I am urging the public to be prepared and stay alert as conditions continue to develop throughout the weekend." (Read the related article about the New York State preparations.)

Latest Conditions:

As of 5 a.m. Saturday, the National Hurricane Center provided the latest update:

Isaias has a somewhat ragged appearance in satellite imagery this morning, likely due to the impact of westerly shear and dry air entrainment.  The area of central convection has shrunk in size, although radar data from the Bahamas shows some banding near the center and occasional attempts to wrap up an eyewall.  Also, a dry slot is now present in the eastern semicircle between the central convection and the outer banding.  The last Hurricane Hunter mission indicated that the maximum winds had increased to near 75 kt, so that is maintained for this advisory.  NOAA and Air Force

Reserve Hurricane Hunter aircraft are scheduled to investigate the storm during the next several hours.

The initial motion is now northwestward or 315/10 kt.  The track forecast philosophy remains unchanged, as Isaias should continue to move northwestward on the southwest side of a mid-level ridge today and begin to turn north-northwestward through a weakness in the ridge on Sunday.  After that, the storm should recurve into the mid-latitude westerlies, with a turn toward the north-northeast and northeast with an increase in forward speed likely.  The track guidance envelope has shifted a little to the east near the Florida coast and calls for a slower forward motion that the previous guidance.  Thus, the new forecast track has been adjusted a little east of, and slower than, the previous track.

The hurricane is currently undergoing about 25 kt of westerly vertical shear, and some mid-level dry air is present west of the center.  This combination should prevent any more intensification, and, while Isaias is expected to remain a hurricane as it passes near the Florida coast, at least slight weakening should occur during this time.  Current indications from the global models are that the storm will continue to experience strong shear as it recurves, and thus the intensity forecast follows the previous forecast in calling for weakening during this time.

Key Updates:

As of 5 a.m. Saturday, the National Hurricane Center wants everyone potentially impacted by the storm to know these key messages:

1. Hurricane conditions and dangerous storm surge are expected in portions of the Bahamas through Saturday, and Hurricane Warnings are in effect.

2. Hurricane conditions are expected along portions of the Florida east coast late Saturday and Saturday night, and a Hurricane Warning is in effect. Preparations to protect life and property should be rushed to completion.

3. Dangerous storm surge is possible along the Florida east coast from Jupiter Inlet to Ponte Vedra Beach where water rises of 2 to 4 feet above ground level are possible along the immediate coastline and adjacent waterways. Residents in these areas should follow advice given by local emergency officials.

4. Isaias will produce heavy rains and potentially life-threatening flash and urban flooding, especially in low-lying and poorly drained areas, across South to east-Central Florida, and across the Carolinas to the mid-Atlantic. Minor river flooding is possible across portions of the Carolinas and into Virginia early next week.

5. There is a risk of impacts from winds, heavy rainfall, and storm surge spreading along much of the U.S. east coast through early next week, and interests there should monitor the progress of Isaias and updates to the forecast.

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