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Tropical Storm Bertha moves into the Caribbean

Tropical Storm Bertha moves into the Caribbean

MIAMI -- Tropical Storm Bertha has passed across the Windward Islands and into the eastern Caribbean Sea.

The National Hurricane Center in Miami says the tropical storm's maximum sustained winds as of 5 p.m. ET were at 40 mph. The storm was centered about 20 miles northwest of Fort de France, Martinique or 405 miles southeast of San Juan, PR. The storm is moving to the west-northwest at 24 mph with a minimum central pressure of 1007 MB or 29.74 inches.

A tropical storm warning is in effect for Dominica, Martinique, Puerto Rico, Vieques, Culebra, the US and British Virgin Islands.

Tropical system in Atlantic gaining strength

Tropical system in Atlantic gaining strength

A well-defined low pressure system located about 650 miles east of the southern Windward Islands has been producing organized shower and thunderstorm activity during the past several hours.

If this activity persists, tropical depression or tropical storm advisories will be initiated later this morning. Interests in the Lesser Antilles should monitor the progress of this disturbance as it moves west-northwestward at 15 to 20 mph, and watches or warnings may be required for some of these islands later today.

A Hurricane Hunter aircraft is scheduled to investigate the system this afternoon.

* Formation chance through 48 hours: High, 70%

* Formation chance through 5 days: High, 70%

If it turns into a Tropical Storm it will be named Bertha.

Tropical disturbance in Atlantic getting better organized

Tropical disturbance in Atlantic getting better organized

An area of low pressure in the Atlantic is becoming better defined, according to satellite data from the National Hurricane Center.

Associated shower and thunderstorm activity continues to organize and a tropical depression could form by Wednesday

The disturbance could become Tropical Storm Bertha by Friday.

Next best chance of rain Monday

Next best chance of rain Monday

Another dry day Saturday with mostly sunny skies. Highs will be around 90. Much of Sunday will be dry, but late in the day we will bring back a slight chance for showers ahead of a cold front. The next best chance for rain and thunderstorms will be on Monday.

Cooler air will be moving in next week.

Tropical Depression struggling to hold together

Tropical Depression struggling to hold together

Tropical depression number 2 is struggling to hold together as it moves to the west. The depression still has 35mph winds and is moving toward the west at 18mph. It is encountering wind shear and dry air as it moves to the west. It will weaken as it gets closer to the Lesser Antilles. Right now, the storm is about 800 miles away from the islands.

It is not forecast to become a tropical storm, but if it does happen to get up to tropical storm strength, its name would be Bertha.

INTERACTIVE MAP: Track the tropical system

Clouds and rain continue

Clouds and rain continue

The fog will lift as the day goes by, but skies will remain mostly cloudy. We will see very few breaks in the clouds and that should keep high temperatures below the average (89 degrees). Highs today will be around 84.

Look for scattered showers and thunderstorms to pop up this afternoon with the day time heating. None should be severe.

The unsettled weather continues Tuesday as the clouds hang on. We will see another day with mostly cloudy skies and scattered showers and thunderstorms. Thanks to the clouds, temps will remain below the average.

Intermittent Heavy Showers This Weekend

Intermittent Heavy Showers This Weekend

More rain returns Sunday, but it won't be as widespread, and should mainly be in the second half of the day. High temperatures will be slightly warmer in the low to mid 80s.

Rain chances continue through next week with temperatures gradually warming into the upper 80s by the end of the week.