Isaac

Evacuations have already begun in Miami Beach.

Isaac

Isaac

In New Orleans, a state of emergency is in effect.

Isaac

The storm has made landfall in Key West and has already caused damage in Cuba.

Isaac

The storm has made landfall in Key West and has already caused damage in Cuba.

Isaac

High winds and rain are driving people from the beach.

Isaac

Tropical Storm Isaac is gaining strength in the south.

Tropical Storm Isaac Batters Cuba

ADALBERTO ROQUE/AFP/GettyImages

People ride motorbikes in a flooded street in Havana on August 26, 2012, following the passage of tropical storm Isaac. With winds reaching 50 miles (85 kilometers) per hour, the storm brought heavy rain and choppy seas to the Florida Keys after battering Haiti and sweeping across Cuba late Saturday, the US National Hurricane Center said.

Tropical Storm Isaac Batters Cuba

ADALBERTO ROQUE/AFP/GettyImages

Waves batter Havana's seafront on August 26, 2012, following the passage of tropical storm Isaac. With winds reaching 50 miles (85 kilometers) per hour, the storm brought heavy rain and choppy seas to the Florida Keys after battering Haiti and sweeping across Cuba late Saturday, the US National Hurricane Center said.

Tropical Storm Isaac Barrels Through Haiti

THONY BELIZAIRE/AFP/GettyImages

A Haitian stands amid tents in a camp as Tropical Storm Isaac barrels through Port-Au-Prince, Haiti August 25, 2012 . Forecasters earlier said Isaac was near hurricane strength when the eye of the storm passed over Haiti, where hundreds of thousands of people are still living in squalid, makeshift camps following a catastrophic 2010 earthquake. An eight-year-old Haitian girl died when a wall collapsed at her home and a 51-year-old woman died when her roof collapsed, according to officials, who later said two other people had died in the storm. Haiti was the poorest country in the Western Hemisphere even before the earthquake killed 250,000 people, and 400,000 citizens are still living in tent camps in and around the devastated capital Port-au-Prince. More than 3,300 families had been evacuated to temporary shelters ahead of Isaac as aid groups provided clean water and hygiene kits to try to limit the risk of contaminated water and the spread of disease.

Tampa Bay Prepares For Tropical Storm Isaac Ahead Of The Republican National Convention

Photo by Marc Serota/Getty Images

ST. PETE BEACH, FL - AUGUST 26: Area residents fill sand bags ahead of Tropical Storm Isaac August 26, 2012 in St. Pete Beach, Florida. According to reports, Isaac has become stronger as it moves toward the Florida Keys and forecasters say it could strengthen into a Category 2 storm.

Isaac Bears Down On The Florida Keys

Photo by Marc Serota/Getty Images

MARATHON, FL - AUGUST 26: People ride bikes as as Tropical Storm Isaac begins to move ashore on August 26, 2012 in Marathon, Florida. According to reports, Isaac has become stronger as it moves toward the Florida Keys and forecasters say it could strengthen into a Category 2 storm.

Isaac

Photo by Tom Pennington/Getty Images

ST. PETERSBURG, FL - AUGUST 26: Activists demonstrate through downtown on August 26, 2012 in St. Petersburg, Florida. The demonstration was being held on the eve of the start of the Republican's nominating convention which will hold its first session on August 28. The convention was scheduled to start on August 27 but was pushed back one day as Tropical Storm Isaac threatens to hit the Tampa area.

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Isaac

Isaac

Isaac

Isaac

A projection of Isaac as of Sunday.

Isaac

The "spaghetti" models for Sunday.

Isaac

This is Saturday's "spaghetti strings" model options for Isaac's path.

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This is the Saturday update for Isaac

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Isaac also poses a possible threat to Florida during next week’s Republican National Convention in Tampa.

Issac

The U.S. National Hurricane Center says Isaac is expected to strengthen and could become a hurricane by Thursday.

Issac

According to computer modules, Issac will grow back into a category 1 hurricane.

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If Issac becomes a category 1 hurricane, land mass will drop it back to a tropical storm.

Issac

Tropical Storm Isaac is getting better organized as it approaches the Carribbean.

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Isaac Bears Down On Florida Keys

On Aug. 26, 2012 in Marathon, Florida.

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Isaac's forecast, as of Sunday.