Isaac may attempt to restrengthen before reaching the Gulf of Mexico
By Kristina Pydynowski, AccuWeather senior meteorologist
September 17, 2018, 12:57:04 AM EDT
Isaac has not met its demise over the Caribbean Sea as it may attempt to restrengthen into a tropical depression or storm before reaching the Gulf of Mexico early this week.
While once a hurricane over the central Atlantic Ocean, Isaac remains a weaker tropical rainstorm churning through the central Caribbean Sea.
"However, there is a small chance Isaac can regenerate into an organized tropical system as it approaches the Yucatan Peninsula or southern Gulf of Mexico by Tuesday or Wednesday," according to AccuWeather Senior Meteorologist Dan Pydynowski.
Isaac is moving into an area of lower wind shear and water that is more than sufficient to provide fuel for a tropical system.
Wind shear is the increase in wind speed with altitude or over horizontal distance. Strong wind shear can prevent a tropical storm from forming and cause a hurricane to weaken. A small amount of wind shear can vent a tropical storm or hurricane just enough to allow it to strengthen.
"AccuWeather meteorologists are not suggesting that Isaac will turn into another Harvey, which fell apart entering the western Caribbean and then rapidly regained strength while moving across the Gulf of Mexico," AccuWeather Senior Meteorologist Alex Sosnowski said.
“While people from the western Caribbean to the Gulf Coast of the United States should go about their business, they are urged to monitor the situation for any significant changes in Isaac’s strength, but at the same time not dismiss Isaac."
Regardless of strengthening, Isaac will continue to spread localized drenching showers and thunderstorms westward from Hispaniola to Jamaica and Cuba into midweek.
Flood disaster to last 1-2 weeks in Carolinas after Florence’s historic rain ends
Reports: Wilmington among communities cut off by floodwaters as Florence death toll rises to 17
What everyone should know about flood insurance
What to do if you have to drive in a flood
There can be isolated incidents of flash flooding, but most of the downpours may just be a nuisance to residents and visitors by disrupting outdoor and vacation plans.
As soon as thunder is heard, the risk of being struck by lightning is present.
Outside of any short-term issues, the downpours will be beneficial in areas that are suffering rainfall shortages this summer.
Rain and gusty winds would increase if Isaac organizes into a depression or storm. Seas may become choppy and more hazardous to swimmers and operators of small craft if this occurs.
The opportunity for Isaac to restrengthen may lessen as it enters the Gulf of Mexico later this week.
"Regeneration is unlikely at that time as Isaac will move into a zone of higher wind shear," Pydynowski said.
If Isaac is a tropical depression or storm at that time, such wind shear may cap further strengthening or cause it to weaken once again. Land interaction with the Yucatan Peninsula can also inhibit strengthening.
Even if Isaac never re-intensifies, it may still bring another round of downpours to Louisiana or Texas around Friday or Saturday. With the ground saturated from recent heavy rain, frequent downpours could trigger flash flooding.
While AccuWeather meteorologists monitor Isaac, another budding tropical system in the eastern Pacific Ocean could increase showers, thunderstorms and the risk for flash flooding across the Desert Southwest later this week.
Download the free AccuWeather app to keep up-to-date with any bulletins related to Isaac.
Comments that don't add to the conversation may be automatically or manually removed by Facebook or AccuWeather. Profanity, personal attacks, and spam will not be tolerated.
More Weather News
Weather News - March 21, 2019, 3:18:47 PM EDT
The four-day blaze sent smoke and dangerous fumes billowing into the air -- and resulted in a shelter-in-place alert
'You can’t replace that stuff:' Central US residents cope with devastation as floodwaters slowly recede
Weather News - March 21, 2019, 3:24:37 PM EDT
Evacuations, flood warnings and states of emergency persist as historic river flooding continues to burden the north-central United States.
Weather News - March 21, 2019, 1:16:03 PM EDT
In less than 24 hours, Veronica went from an unnamed tropical low to a Category 4 intense tropical cyclone as it spun off the northwestern coastline of Western Australia. The powerful cyclone is now taking aim at the Pilbara Coast.
Tropical Cyclone Trevor may bring a year's worth of rain to central Australia after slamming into Northern Territory
Weather News - March 21, 2019, 2:06:31 PM EDT
The dangers to lives and property are expected to expand well away from where Tropical Cyclone Trevor makes a dangerous strike on Australia's Northern Territory early this weekend.
Cyclone Idai flood catastrophe: Estimates of more than 1,000 dead as 'inland ocean' forms in Mozambique
Weather News - March 21, 2019, 1:50:41 PM EDT
More than a thousand people are feared dead in Mozambique and Zimbabwe as the flood catastrophe caused by Tropical Cyclone Idai rages on. Drier weather is expected to finally return later this weekend.
Weather News - March 21, 2019, 2:36:05 PM EDT
A combination of factors may come together to unleash a rapid flooding event across the central and southeastern portions of Maine and New Brunswick from Thursday night to Friday night.
Weather News - March 21, 2019, 11:53:04 AM EDT
Weather and the expanded MLB schedule have created unforgettable moments for baseball fans
Weather News - March 21, 2019, 12:45:25 PM EDT
A NOAA satellite image shows how the vernal equinox divides the Earth, a phenomenon that's as fleeting as it is breathtaking