Tornado leaves five dead in Iowa

A tornado that ripped through the midwestern US state of Iowa killed five people and left dozens injured, officials said, with homes smashed to pieces and cars thrown through the air.

Improving the effectiveness of earthquake early warning systems

Mobile phones have become invaluable for receiving emergency alerts such as weather warnings, evacuation notices and notifications about missing persons. In Japan, where earthquakes are frequent, they are vital for delivering ...

Air quality alerts are a climate change alarm

The sky over Minnesota was the subject of fascination and frustration over the weekend. Awe over solar-storm triggered northern lights turned to "Aw, not again!" over an air quality alert sparked by smoke drifting from wildfires ...

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