It's official: Knoxville has been placed under a winter storm ... according to the National Weather Service. A warning is ...

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PDS warnings were first used to warn of tornado outbreaks in the Midwest. More than a decade ago, three meteorologists proposed expanding their use to disasters such as ice storms, floods ...

It's official: Knoxville has been placed under ... according to the National Weather Service. A warning is issued when a severe weather event is occurring or is highly likely to occur.

PDS warnings were first used to warn of tornado outbreaks in the Midwest. More than a decade ago, three meteorologists proposed expanding their use to disasters such as ice storms, floods ...