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Environment

California Experiences Warmest, 3rd Driest Year Since 1895

ImaGeoBy Tom YulsmanJuly 17, 2014 8:55 PM
New-Melones-Reservoir.gif

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Dramatic shrinking of New Melones Reservoir in California is seen in this animation of Landsat images. The first was acquired on July 8, 2002, after a wet season that brought just slightly less precipitation than average. The second is from Thursday, July 10, 2014. (Source: USGS Earth Explorer)

I didn't think that the release today of the weekly U.S. Drought Monitor report would bring significant news about California. As the report says, with much of the state categorized as being in extreme or exceptional drought, and May through September being normally dry anyway, "there is not much more room for further deterioration, at least during the dry season."

But the report does contain significant news about the continuing profound drought in California: The past year — from July 2013 through June 2014 — has been the warmest and third driest since 1895. And according to the Drought Monitor:

 The only drier July-June periods were in 1923-24 and 1976-77. This is the first time California experienced 3 consecutive years in the top 20 for dryness: 2011-12 ranked 20th, 2012-13 ranked 18th, and statewide precipitation has averaged 67% of normal during this 3-year period, and was just 56% of normal in 2013-14.

The only silver lining is that "California’s reservoirs hold more water than they did in 1977, when the state experienced its 4th and 2nd driest years on record from July 1975-June 1977," the report states.

They may be fuller now than back then, but that doesn't mean they're all in good shape — as the animation of a dramatically shrinking reservoir at the top of this post dramatizes.

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Source: California Department of Water Resources

I created the animation using Landsat satellite images of New Melones Reservoir in the foothills of the Sierra Nevada mountains west of the Bay Area. The first image was acquired on July 8, 2002. The wet season leading up to summer that year was just slightly drier than normal. Landsat captured the second image in the animation just this past July 10. The difference between a year that was close to normal and now is readily apparent.

For a graph showing how much New Melones Reservoir has dropped in elevation over the past two years, please click on the thumbnail above.

I passed over the lake in an airplane on my way back to Colorado from California last Saturday and snapped this photo through the window:

California-Reservoir-processed-1024x895.jpg

A photograph of New Melones Reservoir taken from a commercial airliner at dusk on July 12, 2014. (Photograph: © Tom Yulsman) It was dusk, and there was a good deal of haze in the sky. So the view of New Melones Reservoir was not very clear. That meant I had do some heavy processing, which unavoidably has produced a good deal of digital noise in the photo. Even so, that bathtub ring of light colored ground evident in the photo tells the tale of how much the lake has dropped due to the continuing drought. Unfortunately, the U.S. Climate Prediction Center is forecasting

that drought conditions will persist or even worsen in California, as well as as in Nevada, and parts of Oregon, Washington, Idaho and Texas, through October 31. In coming weeks I'll be posting more stories and images of the continuing California drought and its impacts on ecosystems, fire risks, and farmers. So please check back.

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