UPDATE: Potential storm hits S.C. coast, another brewing in Atlantic

Update 11 p.m.:  The potential tropical depression is very near the South Carolina coast producing gusty winds and heavy rains. An advisory from the National Hurricane Center places the system about 20 miles south-southwest of Charleston and moving north-northeast at 7 mph. Maximum sustained winds remain 40 mph. Watches and warnings remain in place.

Tropical outlook

Update 8 p.m.:  Potential Tropical Depression 10 is producing heavy rain and gusty wind near the South Carolina coast. An advisory from the National Hurricane Center places the system about 35 miles south-southeast of Charleston.

It was moving northeast at 12 mph while packing 40-mph winds. All the previous tropical storm watches and warnings remain in effect. There is still a 60 percent chance of the system becoming Tropical Storm Irma during the next 24 hours.

Meanwhile, the tropical wave southeast of the Cabo Verde Islands is producing disorganized showers and thunderstorms while maintaining an 80 percent chance of development over the next five days. The next tropical outlook on the wave will be issued at 2 a.m.

STORM 2017: Tracking map, latest news on Harvey, more

Update 5 p.m.: The National Hurricane Center is juggling two tropical disturbances in addition to forecasting for Tropical Storm Harvey, which is still menacing Texas three days after landfall.

A system 40 miles south of Charleston, S.C. was expected to become Irma – the next named storm on the 2017 list – but with no organized center, forecasters said its opportunity for development is waning.

Still, tropical storm conditions are possible along the Carolinas and a tropical storm warning is in effect for areas north of Surf City to Duck, Albemarle Sound and Pamlico Sound.

The system, dubbed potential tropical cyclone 10, has maximum sustained wind speeds of 40 mph, and is moving northeast at 12 mph.

A second area of concern is just off the African coast where forecasters are giving a tropical wave an 80 percent chance of development over five days.

The area of low pressure a few hundred miles southeast of the Cabo Verde Islands is producing disorganized showers and thunderstorms, and is headed west where the tropical Atlantic is more conducive for development.

Update 2 p.m.: An Air Force Hurricane Hunter is flying into the tropical disturbance off the coast of South Carolina, but forecasters said the system still lacks a well-defined center.

The system, which is expected to become a tropical depression or Tropical Storm Irma by Tuesday morning, has maximum sustained wind speeds of 40 mph and is moving north at 9 mph.

A defined center and wind speeds of 39 mph or higher is needed to gain tropical storm status.

Although no significant organization has been seen today, the National Hurricane Center still expects the system to briefly become a tropical storm today or Tuesday morning.

Update 11 a.m.: A tropical storm warning has been issued for the North Carolina coast from Surf City to Duck, including the Albermarle and Pamlico sounds.

National Hurricane Center forecasters said the warning means that tropical storm conditions are expected within the area in the next 24 hours.

The system is about 100 miles south-southwest of Charleston, S.C., with maximum sustained winds of 35 mph. It is moving north-northeast at 9 mph, and expected to skirt the coast to the Virginia state line.

Forecasters believe the system will become Tropical Storm Irma within the next 12 to 24 hours.

Update 8 a.m.: Tropical Storm Irma is forecast to form east of Georgia and South Carolina by Tuesday morning.

In its 8 a.m. forecast, the National Hurricane Center said the system has 35 mph winds and is nearly stationary, spinning about 135 miles south-southwest of Charleston, S.C.

A tropical storm watch is in effect for South Santee River in South Carolina to Duck, Albemarle Sound and Pamlico Sound.

The system is sloppy and doesn’t have a well-defined center, but with winds near 35 mph, “only a slight increase in the definition of the circulation would lead to the formation of a tropical cyclone,” forecasters said.

The National Hurricane Center also increased to 70 percent the chances of development for a tropical wave off the coast of Africa.

The wave has become better organized and a tropical depression could form over the next day or two as it moves west at 15 to 20 mph. The next name on the tropical cyclone list following Irma is Jose, pronounced “ho-ZAY.”

Previous story: The National Hurricane Center is keeping tropical storm watches up for parts of the Carolinas as a disturbance sits stationary off the coast of the Georgia and Florida border.

While chances remain at 90 percent for the formation of a tropical depression or tropical storm over the next 48 hours, forecasters said wind shear is working to shred the system, formerly known as 92L, as it moves closer today to the Georgia and South Carolina coasts.

Check the live Palm Beach Post storm tracking map.

As of the 5 a.m. advisory for the hurricane center, the system was 185 miles south-southwest of Charleston, S.C. It would be named Irma if it develops.

A second disturbance just off the coast of Africa has been given a 50 percent chance of development over five days.

The tropical wave is nothing more than a large area of showers and thunderstorms, but is moving at 15 to 20 mph toward  a better environment for formation in the tropical Atlantic.

Tropical Storm Harvey is maintaining it’s strength as it sits nearly stationary 15 miles north-northeast of Port O’Connor, Texas.

The storm has dumped as much as 30 inches of rain in some places, causing catastrophic flooding and forcing thousands of people to be rescued from their homes.

Rains are expected to continue today over southeastern Texas and southwestern Louisiana.

“With the additional rains, that are expected over the next several days, rainfall totals could reach 50 inches in some locations, which would be historic,” hurricane center forecasters wrote this morning.

Harvey could strengthen somewhat as it moves over water during the next 24 hours, then weaken again as it moves inland later this week near the eastern border of Texas.

This morning, forecasters said the flood threat is spreading farther east into Louisiana with additional rain of 15 to 25 inches possible.

Harvey’s tropical storm-force winds extend outward up to 175 miles from its center. Maximum sustained winds are 40 mph, although flooding remains the biggest threat from the system.

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