熱帶風暴“艾薩克”再度減弱

U.S. weather forecasters have downgraded TropicAl Storm Isaac to a depression but warn the danger to the southern United States from the system is not over.

The National Hurricane Center says the slow-moving Isaac weakened over northern Louisiana Thursday. The system is expected to produce more rain as it moves toward the north. Forecasters say isolated parts of Louisiana, Mississippi, Alabama and Arkansas could get as much as 63 centimeters of rain through Friday.

The hurricane center warned there could still be more flooding across southeastern Louisiana and Mississippi and that tornadoes are possible.

Forecasters are now keeping a close watch on another tropical Storm Kirk.美國氣象預報人員把熱帶風暴“艾薩克”降級爲低氣壓，但同時警告說，美國南部地區所面臨的威脅還沒有消失。

美國國家颶風中心說，“艾薩克”星期四經過路易斯安那州北部，風力已經減弱。預計，“艾薩克”向北移動的過程中還會帶來降雨。氣象預報說，到星期五爲止，路易斯安那州、密西西比州、阿拉巴馬州和阿肯色州某些地區的降雨量可能多達63釐米。

美國國家颶風中心警告說，路易斯安那州東南部和密西西比州可能還會發生洪水，並可能出現龍捲風。

氣象預報人員目前正在密切監視一個代號爲“柯克”的熱帶風暴。