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Thu Dec 7, 2017, 09:17 AM

California Burning: Expect Stronger Santa Ana Winds, Drier Winters As Temperatures Keep Rising

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(Four large wildfires burn across Los Angeles in this December 5 satellite shot. Image source: NASA Worldview.)

Conditions across the West have been drier lately. Hotter lately. A lot less winter-like during the winter season lately. Add in the fact that climate change is expected to increase the strength of the wildfire-sparking Santa Ana winds and this trend of ebbing winter is a rather serious factor.

The very reason why we use the words — fire season — is due to the fact that fire is more prevalent when it is hotter, when it is drier, and when the dry winds blow more strongly. For California, fire season happens twice a year — once in early summer and again in autumn as the dry Santa Ana winds begin to howl.

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(Consistent unseasonal heat and the development of powerful high pressure ridges over the North American West amplify the Santa Ana winds and set the stage for more severe wildfires. This week, a strong ridge and related abnormal warmth and drought helped to fan a historic Los Angeles outbreak. Image source: Climate Reanalyzer.)

The Santa Ana season lasts from October through April. It notable due to the fact that it tends to threaten more heavily populated areas. Its primary mitigating factor — cooler winter weather — is receding. And, according to this research, the same factors that are warming the U.S. West are also making the Santa Ana winds blow stronger. So we have good reason to believe that the effects of human-caused climate change are making California’s fall and winter fire season considerably worse.

Today is December 6, just a little more than two weeks before the Winter Solstice. Seasonally, we are at the gates of winter. Winter should be coming. But, instead, we have drought in Southern California. Instead we have had consistently warmer than normal weather over the past 30 days. Instead we have 70 mile per hour Santa Ana winds raging over withering peaks and through the drying valleys. These are conditions consistent with a fire season amplified by climate change. Not with normal winter. And today, in Los Angeles alone, we have four fires raging simultaneously.

EDIT

In total, more than 1,000 firefighters are presently battling these four fires around the Los Angeles region. And the risks to the city are now as high as they have ever been. For on Wednesday, weather forecasters are calling for Santa Ana winds to continue to gust as high as 70 miles per hour. With the strength of these powerful fire-inducing winds peaking on Thursday as gusts are predicted to hit as high as 80 miles per hour. The winds will loft sparks and burning material from the fires and drop it over the city — creating nightmare conditions for firefighters trying to contain the four blazes. Red flag warnings — indicating that conditions are ideal for fire combustion — are expected to remain in place over Southern California through Friday.

EDIT/END

https://robertscribbler.com/2017/12/06/winter-is-supposedly-coming-so-why-is-california-burning/#comments

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