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Extreme Weather 101:
Climate Change & Precipitation


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Extreme Weather 101:
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Tweetable Fact

If you feel like there's more rain than there used to be, you are correct. Average U.S. precip. is up 5% since 1900 http://bit.ly/11ah5Jf



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Story Highlights

Rainfall

  • Since 1900, the average annual precipitation is up 5 percent for the continental U.S.

  • There are major regional variations, where some of the Southwest has seen precipitation trends drop by as much as 15 percent, while a swath of land from North Dakota down to Oklahoma has seen a precipitation rise of 15 percent.

  • The majority of this extra precipitation is coming from extreme precip events.

  • A warming globe and buildup of greenhouse gases has created an atmosphere that holds more moisture, eventually leading to more rain or snow.

Hot Days

  • The number of hot days is on the rise.

  • Heat is one of the most understood consequences of global warming.


Click for a high-resolution version: WITH A title - WITHOUT

Torrential, record-setting rainfall has pummeled parts of the nation the past few weeks - with more on the way. From the Midwest to Florida to the Eastern Seaboard, the rain has come in different waves from different storms but is producing the same flooding problem. If you feel like there is more rain than there used to be, you are correct. As the graphic shows, overall precipitation for the continental U.S. is up five percent.

Even with the national rainfall total on the rise, there are major regional variations that we need to draw your attention to. For example, parts of the West and Southwest have seen a drop in their average precipitation, with sections of Arizona down 15 percent - only worsening drought conditions in these places. But the Northeast and Southern Great Plains have both received an eight percent rise in their precipitation total, while the Midwest's rainfall rise is up nine percent - the same region that has swung from flood to drought to flood in the span of three years. There is even a swath of land from North Dakota down to Oklahoma where rainfall amounts have risen by as much as 15 percent.

Not only is the annual precpitation average on the rise nationally, the extra rain is coming down from just the kinds of downpours that have filled basements, flooded out roadways, and sent rivers and creeks over their banks recently. (We covered the rise in extreme precipitation in a previous Climate Matters Alert that you can revisit through our archives page).

While there is natural variation in weather patterns, a warming globe and the buildup of heat-trapping greenhouse gases has created an atmosphere that holds more moisture. This means there is more moisture available to fall back down.

Hot Days

Heat is not only the number one weather-related killer, it is one of the most understood consequences of global warming. Studies have shown that global warming made the deadly 2003 European heat wave more likely to occur, as well as the record-shattering 2010 Russian heat wave.

As the graphic below shows, hot days are coming more often than they used to - exacerbating droughts and contributing to dangerous wildfire conditions. We included both a high resolution graphic for you to use on air, and an interactive for your social media use that shows you the specific number of days for each year. This is something you can use for this round of heat, and again with additional rounds of heat this year.


Click here for a high-resolution version
or
Click here for the interactive

To embed the interactive, simply copy and paste the code below:

<iframe width=640 height=360 frameborder="no" src="http://www.climatecentral.org/highcharts/TVMets/2013-06-01/HotDays.php?sid=CAEthr"></iframe>




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