Geomagnetic storms: When should we look up and when should we worry?

The summit sees hurricane-force wind gusts more than 110 days of the year on average. The most powerful wind gust ever recorded by the Mount Washington Observatory was measured at 231 mph on April 21, ...

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The Mount Washington Observatory said the peak wind gust was 138 mph. Video from the observatory showed how strong the winds ...

The air temperature at the summit of Mount Washington dropped to minus 20.6 degrees Thursday morning. Wind gusts exceeded 100 mph at times, and wind chills reached into the 60s below zero.

Mount Washington, known for its harsh and erratic weather, saw its wind gusts top out at 161 mph on Monday, the observatory reported. Wind speeds are relative, however: The mountain still holds ...

Large and destructive avalanches are "very likely" on Mount Washington and New ... the observatory says Arctic air could make the actual temperature as cold as 30 degrees below zero by early ...