Tropical Storm Marco has a head start and is already in the Gulf of Mexico, and is expected to make landfall on Monday. Seven to 11 of them are expected to become hurricanes and three to six of those to become major hurricanes with winds of at least 178km/h (111mph).
Marco is expected to encounter upper level wind shear that could prohibit the storm from becoming a hurricane, but the extent of that limit is unknown.and it could also be weaker than now forecast.
The tropical storms are forecast to meet in the Gulf on Tuesday. "Add a second storm into the mix and the forecasting becomes exponentially more complex as the two storms can interact and affect one another", says Wenckstern.
Meanwhile, further east, Tropical Storm Laura is strengthening and becoming more organised near the Virgin Islands.
On the current forecast track, Laura will move near Hispaniola on Saturday afternoon and night, and then near Cuba on Sunday. It was moving west-northwest at 30kmh.
Tropical Storm Laura has top winds of 72kmh and is expected to move west across much of the Greater Antilles this weekend, said the hurricane centre.
Tropical Storms Laura and Marco are barreling towards the Gulf coasts of Louisiana and Texas.
A hurricane watch was issued for Intracoastal City, Louisiana, eastward to the Mississippi-Alabama border.
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The hurricane center on Friday issued tropical storm warnings for the northern Leeward Islands and Puerto Rico. Marco, now on track to hit Texas, is expected to remain a tropical storm. As of Sunday morning, Marco was nearing hurricane strength with sustained winds of 70 miles per hour.
Tropical Storm Laura has strengthened Sunday morning and now has winds of 50 miles per hour.
Torrential downpours are expected over the next 24 to 48 hours. The Dominican Republic and Haiti can expect 100-200 mm, with maximum amounts of 300 mm inches across southern areas.
The updated 2020 Atlantic hurricane season probability and numbers of named storms.
The latest set of storms developed just as the National Oceanic and Atmospheric Administration (NOAA) explained how its modern fleets of satellites have improved hurricane forecasting. We'll closely watch for changes.
The official forecast track shows Laura possibly reaching the southern Gulf of Mexico as Marco is making landfall on Monday. Tourists staying in hotels should be aware of hazardous weather conditions and consider altering their plans starting on Sunday, Monroe County officials said in a news release.
Louisiana Gov. John Bel Edwards declared a state of emergency Friday ahead of the storms and on Saturday asked President Donald Trump to grant federal emergency status to the state.