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Forecasters say Tropical Storm Tammy has formed in the Atlantic_我的网站

一 |     MIAMI -- Tropical Storm Tammy formed Wednesday afternoon in the Atlantic Ocean, putting a group of islands on alert for its expected approach.The Miami-based National Hurricane Center said Tammy was centered at 5 p.m. EDT about 625 miles (1,005 kilometers) east of the Windward Islands. It was moving briskly to the west at 23 mph (37 kph) and expected to gradually strengthen in coming days.Tropical storm watches have been issued for Barbados, Dominica, and Martinique and Guadeloupe. Forecasters said tropical storm conditions were possible in the region starting within 48 hours and that further watches and warnings will likely be required Wednesday night or Thursday. Tammy is initially expected to spread heavy rains over the northern Windward and Leeward Islands through Friday and then across the U.S. and British Virgin Islands and Puerto Rico over the weekend, according to the hurricane center.The center's opening advisory on Tammy said total rainfall could measure between 3 and 6 inches (7-14 centimeters) with maximum amounts of 10 inches (25 centimeters) in some spots in the northern Windward Islands and Leeward Islands. Lesser rainfall amounts are expected in the British and U.S. Virgin Islands into eastern Puerto Rico, the hurricane center added.The prospect of heavy rains as Tammy nears those islands raises a threat of scattered flash flooding, urban flooding and isolated mudslides in higher terrain, according to meteorologists.。     8 月 26 日消息，中科宇航今日宣布，8 月 25 日，中科宇航力箭二号遥二运载火箭已按流程完成出厂前各项工作，产品功能、性能指标均满足飞行任务要求，顺利通过出厂评审，整装待发奔赴发射场，拟于今年 10 月完成发射。据介绍，力箭二号运载火箭是我国首款“通用助推器核心”构型的运载火箭，500 公里太阳同步轨道运载能力 8 吨，200 公里近地轨道运载能力 12 吨，具有运载能力大、固有可靠性高、可制造性强、操作简洁便利、拓展空间强、可重复使用等优势。作为我国大规模星座组网和低成本货物运输的主力运载火箭，将支撑低轨星座规模化组网、低成本空间站货物运输及各类科学实验卫星发射。注意到，力箭二号运载火箭已完成首飞验证。今年 3 月 30 日，力箭二号遥一运载火箭成功将轻舟初样试飞船和 2 颗卫星精准送入预定轨道，单次任务输送 4.2 吨载荷入轨，首飞圆满成功、指标表现优异。官方表示，本次力箭二号遥二运载火箭总装测试工作高效有序推进。团队持续优化生产、总装、测试全流程工艺，迭代提升产品研制效率与交付质量，火箭总装测试周期较首飞实现稳步缩短，向标准化、批量化研制发射目标稳步迈进。

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