Water level warning.

水位警告。

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Local weather forecasters issued the first red rainstorm alert of the year - the highest on the 3-level warning system.

上海中心气象台发布了今年以来首次最高级别的暴雨红色预警信号。

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From an early-warning perspective, make sure the warnings go right down to the community level.

从早期预警的角度来看，要确保这些警告直接下达到社区层面。

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Recently,the World Health Organization raised its warning about the new H1N1 virus to its highest level.

VOA: special.2009.07.14

The nation's civilian "high" alert -- the second highest level of warning -- was put in place Tuesday.

CNN: Al-Jazeera airs purported al Qaeda message

The UK's "negative outlook" is the lowest level of warning offered by the agency - and can be followed by a "negative watch" implying a more than 50% chance of downgrade.

BBC: Moody's rating agency places UK on negative outlook

Two international ratings agencies have downgraded the country's credit grade from the top level AAA, warning about the government's fiscal policies.

NPR: UK In Dark Mood As New Recession May Be Confirmed