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		<title>Hurricane Harvey's rainfall was so heavy the US National Weather Service added new colors to its maps — Quartz</title>

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			<span class="kicker">PURPLE RAIN</span>
		<h1 itemprop="headline">Hurricane Harvey dropped so much rain the US National Weather Service added new colors to its maps</h1>	<div class="item-meta-mobile"><div class="byline item-meta-row">
	<h5>Written by</h5>

	
		
			
			<a href="https://qz.com/author/zschlangerqz/" class="author-name" data-index="0" itemprop="author">Zoë Schlanger</a>

			
			
			
		
		
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			<span class="timestamp" itemprop="datePublished">August 28, 2017</span>
	
	
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			<i class="icon-camera"></i>Purple rain is bad news.							<span class="featured-image-credit has-space"> (National Weather Service)</span>
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			<a href="https://qz.com/author/zschlangerqz/" class="author-name" data-index="0" itemprop="author">Zoë Schlanger</a>

			
			
			
		
		
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			<span class="timestamp" itemprop="datePublished">August 28, 2017</span>
	
	
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			<p>Hurricane Harvey&rsquo;s rainfall is, quite literally, off the charts. The US National Weather Service needed to add two colors to its flood maps&mdash;a dark purple hue to represent &ldquo;20 to 30&rdquo; inches (51-76 cm) rainfall, and a lighter purple to indicate &ldquo;greater than 30 inches.&rdquo;</p>
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<p lang="en" dir="ltr"><a href="https://twitter.com/hashtag/Harvey?src=hash">#Harvey</a> in perspective.  So much rain has fallen, we&#39;ve had to update the color charts on our graphics in order to effectively map it. <a href="https://t.co/Su7x2K1uuz">pic.twitter.com/Su7x2K1uuz</a></p>
<p>&mdash; NWS (@NWS) <a href="https://twitter.com/NWS/status/902174274571689984">August 28, 2017</a></p></blockquote>
</div>
<p>Prior to Harvey, which has been dumping rain on Texas since the night of Aug. 25, the NWS maps stopped at &ldquo;greater than 15 inches&rdquo; designation, marked by a dark mauve.</p>
<p>The agency <a href="https://www.nytimes.com/2017/08/27/us/harvey-texas-storm.html">called Harvey&rsquo;s rainfall</a> &ldquo;unprecedented.&rdquo; Parts of southeastern Texas have already received more than 30 inches of rain, with some areas forecast to get <a href="https://weather.com/storms/hurricane/news/tropical-storm-hurricane-harvey-rain-flood-forecast-texas-louisiana">as much as 50 inches</a> by the time Harvey, which has now weakened to a tropical storm, ends this week.</p>
<p>That record rainfall is thanks to an unusual situation. Hurricanes usually suck water up from the ocean and release it over land. But Harvey has already dropped so much water on Texas that the flooded area is acting like a small ocean; the storm is &ldquo;pulling that water back up into itself and dumping it again as more rain,&rdquo; according to <a href="https://www.scientificamerican.com/article/hurricane-harvey-why-is-it-so-extreme/">Scientific American</a>.</p>
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The US National Weather Service needed to add two colors to its flood maps&mdash;a dark purple hue to represent &ldquo;20 to 30&rdquo; inches (51-76 cm) rainfall, and a lighter purple to indicate &ldquo;greater than 30 inches.&rdquo;<\/p>\n<div class=\"embed-twitter\">\n<blockquote class=\"twitter-tweet\" >\n<p lang=\"en\" dir=\"ltr\"><a href=\"https:\/\/twitter.com\/hashtag\/Harvey?src=hash\">#Harvey<\/a> in perspective.  So much rain has fallen, we&#39;ve had to update the color charts on our graphics in order to effectively map it. <a href=\"https:\/\/t.co\/Su7x2K1uuz\">pic.twitter.com\/Su7x2K1uuz<\/a><\/p>\n<p>&mdash; NWS (@NWS) <a href=\"https:\/\/twitter.com\/NWS\/status\/902174274571689984\">August 28, 2017<\/a><\/p><\/blockquote>\n<\/div>\n<p>Prior to Harvey, which has been dumping rain on Texas since the night of Aug. 25, the NWS maps stopped at &ldquo;greater than 15 inches&rdquo; designation, marked by a dark mauve.<\/p>\n<p>The agency <a href=\"https:\/\/www.nytimes.com\/2017\/08\/27\/us\/harvey-texas-storm.html\">called Harvey&rsquo;s rainfall<\/a> &ldquo;unprecedented.&rdquo; Parts of southeastern Texas have already received more than 30 inches of rain, with some areas forecast to get <a href=\"https:\/\/weather.com\/storms\/hurricane\/news\/tropical-storm-hurricane-harvey-rain-flood-forecast-texas-louisiana\">as much as 50 inches<\/a> by the time Harvey, which has now weakened to a tropical storm, ends this week.<\/p>\n<p>That record rainfall is thanks to an unusual situation. Hurricanes usually suck water up from the ocean and release it over land. But Harvey has already dropped so much water on Texas that the flooded area is acting like a small ocean; the storm is &ldquo;pulling that water back up into itself and dumping it again as more rain,&rdquo; according to <a href=\"https:\/\/www.scientificamerican.com\/article\/hurricane-harvey-why-is-it-so-extreme\/\">Scientific American<\/a>.<\/p>\n","hero":{"id":1063953,"alt":"Purple rain is bad news.","caption":"Purple rain is bad news.","credit":"National Weather Service","width":796,"height":377,"aspectRatio":2.1114058355438,"url":"https:\/\/qzprod.files.wordpress.com\/2017\/08\/screen-shot-2017-08-28-at-12-34-17-pm.png?w=796","size":"extra-large"},"kicker":"PURPLE RAIN","seoTitle":"Hurricane Harvey&#039;s rainfall was so heavy the US National Weather Service added new colors to its maps","facebookTitle":"Harvey dropped so much rain the National Weather Service had to add new colors to its maps","facebookDescription":"There are two new shades of purple to encompass the record rain levels.","edition":"global","taxonomies":{"obsession":[],"tags":[{"name":"Climate change","slug":"climate-change"},{"name":"extreme weather","slug":"extreme-weather-2"},{"name":"flooding","slug":"flooding"},{"name":"Global warming","slug":"global-warming"},{"name":"Houston","slug":"houston"},{"name":"Hurricane Harvey","slug":"hurricane-harvey"},{"name":"hurricanes","slug":"hurricanes"},{"name":"rainfall","slug":"rainfall"},{"name":"Texas","slug":"texas"},{"name":"tropical storm","slug":"tropical-storm"}],"qz_series":[],"topic":[{"name":"Politics and policy","slug":"politics-and-policy"}]},"byline":{"authors":[{"name":"Zo\u00eb Schlanger","username":"zschlangerqz","url":"https:\/\/qz.com\/author\/zschlangerqz\/","twitter":"zoeschlanger"}],"type":"author","label":"Written by"},"share":{"twitter":"https:\/\/twitter.com\/intent\/tweet?url=https%3A%2F%2Fqz.com%2F1063945&text=Harvey%20dropped%20so%20much%20rain%20the%20National%20Weather%20Service%20had%20to%20add%20new%20colors%20to%20its%20maps&via=qz","facebook":"https:\/\/www.facebook.com\/sharer.php?u=https%3A%2F%2Fqz.com%2F1063945%2Fhurricane-harveys-rainfall-was-so-heavy-the-us-national-weather-service-added-new-colors-to-its-maps%2F&caption=qz.com%20%7C%20By%20Zo%C3%AB%20Schlanger","linkedin":"https:\/\/www.linkedin.com\/shareArticle?mini=true&url=https%3A%2F%2Fqz.com%2F1063945%2Fhurricane-harveys-rainfall-was-so-heavy-the-us-national-weather-service-added-new-colors-to-its-maps%2F&title=Harvey%20dropped%20so%20much%20rain%20the%20National%20Weather%20Service%20had%20to%20add%20new%20colors%20to%20its%20maps&summary=Hurricane%20Harvey%E2%80%99s%20rainfall%20is%2C%20quite%20literally%2C%20off%20the%20charts.%20The%20US%20National%20Weather%20Service%20needed%20to%20add%20two%20colors%20to%20its%20flood%20maps%E2%80%94a%20dark%20purple%E2%80%A6&source=Quartz","email":"mailto:?subject=Quartz%3A%20Harvey%20dropped%20so%20much%20rain%20the%20National%20Weather%20Service%20had%20to%20add%20new%20colors%20to%20its%20maps&body=https%3A%2F%2Fqz.com%2F1063945%2Fhurricane-harveys-rainfall-was-so-heavy-the-us-national-weather-service-added-new-colors-to-its-maps%2F%0A%0AHurricane%20Harvey%E2%80%99s%20rainfall%20is%2C%20quite%20literally%2C%20off%20the%20charts.%20The%20US%20National%20Weather%20Service%20needed%20to%20add%20two%20colors%20to%20its%20flood%20maps%E2%80%94a%20dark%20purple%E2%80%A6%0A%0ASign%20up%20for%20the%20Quartz%20Daily%20Brief%3A%20https%3A%2F%2Fbit.ly%2Fquartzdailybrief.","whatsapp":"whatsapp:\/\/send?text=Harvey%20dropped%20so%20much%20rain%20the%20National%20Weather%20Service%20had%20to%20add%20new%20colors%20to%20its%20maps%3A+https%3A%2F%2Fqz.com%2F1063945%2Fhurricane-harveys-rainfall-was-so-heavy-the-us-national-weather-service-added-new-colors-to-its-maps%2F"},"peer39":[9391,9392,9736,1908,9389,9370,9521,9506,9504,9522,9519,9505,9671,9672,9656,9367,9606,9597,9369,12625,21363,18899,13793]}]}};
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