Tropical Depression Nine forms in Atlantic

7-29 11am

Updated 5:54 p.m. to correct system  name to Potential Tropical Cyclone Nine.

HOLT, Fla., July 29, 2020—The low pressure system in the Atlantic is now Potential Tropical Cyclone Nine.

Although only gradual strengthening is expected during the next day or two, PTC9 is forecast to become Tropical Storm Isaias tonight or tomorrow before it reaches the Leeward Islands Wednesday.

The system is speeding west at 23 mph with maximum sustained winds of 40 mph.

An Air Force Reserve reconnaissance aircraft mission is scheduled for this afternoon.

Details of the long-range track and intensity forecasts are more uncertain than usual due to the system’s lack of a well-defined center and interaction with portions of the Greater Antilles later this week, according to the National Hurricane Center.

Because of this, the NHC stresses there is greater-than-average uncertainty about both the short-term and longer-term track and intensity forecasts.

Strength of the storm will determine where it will track. A stronger system is likely to favor a more northern track, while a weaker system is likely to track closer to the equator, according to the NHC.

NHC forecast


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