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Study: Northern hemisphere summers now warmest of last 600 years

Summers in the northern hemisphere are now warmer than at any period in six centuries, according to climate research published on Wednesday in the science journal Nature. Harvard University researchers analysing evidence from Arctic tree rings, ice cores, lake sediments and thermometer records said recent warm temperature extremes in high…

Close comet flyby will allow for spectacular naked-eye viewing in northern hemisphere

A rare bright comet shows up in the northern hemisphere this week, cruising past Earth with promise of spectacular naked-eye viewings of the giant ball of ice and dust streaking the twilight sky with a blazing tail. Dubbed Pan-STARRS after the Hawaii-based telescope that first spotted it nearing our corner…

Cities affect weather thousands of kilometers away: study

Heat from large cities alters local streams of high-altitude winds, potentially affecting weather in locations thousands of kilometres (miles) away, researchers said on Sunday. The findings could explain a long-running puzzle in climate change — why some regions in the northern hemisphere are strangely experiencing warmer winters than computer models…

Warmer summers cause colder winters, scientists say

SINGAPORE (Reuters) – Warmer summers in the far Northern Hemisphere are disrupting weather patterns and triggering more severe winter weather in the United States and Europe, a team of scientists say, in a finding that could improve long-range weather forecasts. Blizzards and extreme cold temperatures in the winters of 2009/10…