“It's been downgraded to a tropical storm.”

You're talking to your mother about a hurricane that is headed toward you. You heard on the news that the strength of the hurricane has dropped, so it's not 

It's been downgraded to a tropical storm.

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“There's a hurricane headed toward us.”

 You're talking to your mother, who lives in another part of the country, on the telephone. You are preparing to have bad weather. You say:

There's a hurricane headed toward us.

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