New Jet Stream Caused 3 Extreme Climate Events Recently

The jet stream is exhibiting unusual undulating behavior that’s become increasingly common in summertime over the past decade, reports Jeff Masters at, causing 3 extreme weather events within the past two months. The latest was a sharp trough of low pressure over the Central US, and equally sharp ridges of high pressure over the West and East Coast. Since the jet stream acts as the boundary between cool, Canadian air to the north and warm, subtropical air to the south, this means that record heat penetrated unusually far to the northwest US under the ridges of high pressure, and record cold extended unusually far to the south into Texas under the trough of low pressure. In late May, a  high pressure ridge became stuck over northern Scandanavia, causing all-time May heat records and blocked low pressure systems from moving north, which led to record rains and flooding over Austria and Germany. In mid June, a ridge of high pressure over Alaska broke all-time heat records in the state, while a low pressure system became trapped over Alberta, Canada, causing a $3 billion flood disaster in Calgary.


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New “Extreme” Jet Stream Has Caused 3 Extreme Climate Events in Past Two Months, reports Jeff Masters at  This new behavior is becoming increasingly common during the summer over the past decade, he notes. As the jet stream, which separates cold polar from warm southern air, starts to trace gigantic undulations, it’s pushing record high AND record low temperatures into the US and elsewhere. in past



About melharte

Mel (Mary Ellen) Harte is a biologist (PhD) and climate change educator. She co-authored the free online book, COOL THE EARTH, SAVE THE ECONOMY, available at www.CoolTheEarth.US, and writes the CLIMATE CHANGE THIS WEEK column at the HuffingtonPost. Living summers in the alpine Rockies, she is on the frontlines of watching what climate change can do. Her diagnostic digital photographs of wildflowers have appeared in numerous publications.
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