As Hurricane Gabrielle churns in the open Atlantic , forecasters are watching two tropical waves that could soon develop – signs the slow hurricane season is beginning to heat up.

The more organized of the two waves was located in the central Atlantic and was producing thunderstorms southwest of the Cabo Verde Islands. The other disturbance was moving 400 miles east of the Leeward Islands, according to the National Hurricane Center . Both seem poised for development, forecasters said.

"Looking at the satellite, the waves seem pretty juicy right now," said Alex DaSilva, lead hurricane expert for AccuWeather, adding, "This is the first time in a while that we're seeing multiple really healthy looking tropical waves."

The heightened storm activity comes during what has been a quiet 20

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