Month: September 2019

Forbes: Global Warming to Blame But Definitely Not Linked to Early Snow in the Rockies

Mountain Goat at Hidden Lake near Logan Pass in Glacier National ParkMountain Goat at Hidden Lake near Logan Pass in Glacier National Park
Mountain Goat at Hidden Lake near Logan Pass in Glacier National Park. By Robert M. RussellOwn work, CC BY-SA 4.0, Link

Guest essay by Eric Worrall

Although global warming might have been implicated in harsh weather in the Rockies, Forbes author Dr. Marshall Shepard definitely wants to make it very clear he is not trying to link this snow event to climate change, even though there is a growing body of evidence that global warming will make extreme cold and snow more likely.

The Blizzard In The Rockies Doesn’t Disprove Climate Change But People Will Say It Anyhow

Marshall Shepherd Senior Contributor 
Sep 29, 2019, 04:52pm

I predicted several days ago that some people would be tweeting that this early season snowstorm in parts of the Rocky Mountain region somehow refutes anthropogenic climate change. Rob Bailey, a computer engineer in Ohio, brought the Tweet at this link to my attention. I am sure there are many more just like it.

So why is the region experiencing such record cold and snow conditions in terms of magnitude of the event? To answer this question, we have to look to the jet streamAccording to the NWS Glossary, the jet stream is a region of “relatively strong winds concentrated in a narrow stream in the atmosphere, normally referring to horizontal, high-altitude winds….The position and orientation of jet streams vary from day to day.” The wavy pattern of the jet stream is a very strong determinant of general weather patterns, particularly in terms of temperature and wetness. With this storm, the jet stream plunged southward bringing extremely cold air into the region. An upper-level low approaching from the Pacific region supplied the moisture.

To be clear, this is a weather event. I am not attributing it to climate change at all. However, I do want to conclude with something that is very counterintuitive to many people. There is a growing body of evidence (and a few counter-narratives) in the peer review literature that suggests that because the Arctic region is warming, there is less of a difference in temperature between the polar and tropic regions. That difference, called a gradient, is what determines the strength of the jet stream. If the difference is smaller due to so-called Arctic Amplification (warming in the Arctic), the jet stream would be wavier. The “so what” is that a jet stream with greater wave amplitude means more extreme troughs or “dips” with cold air and more extreme ridges or “humps” with warm air. In other words, the extremes on both sides of the temperature range are amplified.

Read more:

The following image seems to have upset Dr. Shepherd, because some cruel contrarians are using this image to mock the urgency of our global warming emergency.

Now don’t any of you go upsetting Dr. Shepherd even further by suggesting what he wrote doesn’t make sense.

via Watts Up With That?

September 30, 2019 at 04:19PM

New Video : If I Was Greta’s Teacher

New Video : If I Was Greta’s Teacher

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via Real Climate Science

September 30, 2019 at 04:06PM

Travelling through the Gibson Desert Oct 1 – 10 — (sorry about emails)

Just a quick note to say I’ll be out in the Gibson desert beyond phones and emails for the next ten days. Apologies I won’t be able to reply and haven’t set up an email auto reply. Responses will be very very delayed. Posts are still coming, David will keep an eye on things. Thanks to the moderators for keeping discussion going. Merci! Back soon. — Jo


Photo by Karl JK Hedin on Unsplash Rating: 0.0/10 (0 votes cast)

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via JoNova

September 30, 2019 at 03:22PM

Montana Governor Declares Emergency

This comes from the Sacramento Bee of all places.

Montana Gov. Steve Bullock declared an emergency on Sunday for areas hit by an historic early-season snowstorm.

The storm brought heavy, wet snow and high winds that closed roads, downed trees and caused scattered power outages.

Snowing in eight states

Winter storm warnings were posted for parts of western Montana, northern Idaho and northeast Washington, with snow also forecast for parts of Wyoming, Utah, Oregon, Nevada and California.

The brunt of the storm hit Montana where up to 2 feet (61 cm) of snow fell in the mountains on Saturday and a record 14 inches (35.5 cm) fell in Great Falls. Snow was still falling on Sunday.

Thanks to Bill Sellers and Lyn Jenkins for this link

“Remember those pix from last year of them trying to harvest wheat in the snow?” asks Bill.

The post Montana Governor Declares Emergency appeared first on Ice Age Now.

via Ice Age Now

September 30, 2019 at 01:28PM