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<meta name="description" content="Unprecedented rainfall totals from tropical cyclone Harvey caused catastrophic flooding in southeastern Texas and southeastern Louisiana, leaving dozens of casualties, displacing thousands and causing huge economic disruption. Warnings and advisories from the US National Hurricane Center and US National Weather Service were pivotal in the disaster mobilization effort. Large parts of southeast Texas saw more than 30-35 inches (762-889 mm) with isolated amounts up to 42 inches (1067 mm) of rain since 24 August. Cedar Bayou in Texas received 51.88 inches of rain (1.3 meters), according to the U.S. National Weather Prediction Center." />
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<meta property="og:description" content="Unprecedented rainfall totals from tropical cyclone Harvey caused catastrophic flooding in southeastern Texas and southeastern Louisiana, leaving dozens of casualties, displacing thousands and causing huge economic disruption. Warnings and advisories from the US National Hurricane Center and US National Weather Service were pivotal in the disaster mobilization effort. Large parts of southeast Texas saw more than 30-35 inches (762-889 mm) with isolated amounts up to 42 inches (1067 mm) of rain since 24 August. Cedar Bayou in Texas received 51.88 inches of rain (1.3 meters), according to the U.S. National Weather Prediction Center." />
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<meta name="twitter:description" content="Unprecedented rainfall totals from tropical cyclone Harvey caused catastrophic flooding in southeastern Texas and southeastern Louisiana, leaving dozens of casualties, displacing thousands and causing huge economic disruption. Warnings and advisories from the US National Hurricane Center and US National Weather Service were pivotal in the disaster mobilization effort. Large parts of southeast Texas saw more than 30-35 inches (762-889 mm) with isolated amounts up to 42 inches (1067 mm) of rain since 24 August. Cedar Bayou in Texas received 51.88 inches of rain (1.3 meters), according to the U.S. National Weather Prediction Center." />
<meta property="article:published_time" content="2017-08-28T13:04:21+02:00" />
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<meta itemprop="description" content="Unprecedented rainfall totals from tropical cyclone Harvey caused catastrophic flooding in southeastern Texas and southeastern Louisiana, leaving dozens of casualties, displacing thousands and causing huge economic disruption. Warnings and advisories from the US National Hurricane Center and US National Weather Service were pivotal in the disaster mobilization effort. Large parts of southeast Texas saw more than 30-35 inches (762-889 mm) with isolated amounts up to 42 inches (1067 mm) of rain since 24 August. Cedar Bayou in Texas received 51.88 inches of rain (1.3 meters), according to the U.S. National Weather Prediction Center." />
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                    <h1 class="page-header">Hurricane Harvey causes catastrophic floods in USA</h1>
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    <h2>Hurricane Harvey causes catastrophic floods in USA</h2>
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    <p>Unprecedented rainfall totals from tropical cyclone Harvey caused catastrophic flooding in southeastern Texas and southeastern Louisiana, leaving dozens of casualties, displacing thousands and causing huge economic disruption. Warnings and advisories from the US National Hurricane Center and US National Weather Service were pivotal in the disaster mobilization effort. </p>

<p><img alt="US flooding caused by hurricane Harvey. Photo: US Coast Guard Heartland." class="media-element file-default" data-delta="1" data-fid="10752" data-media-element="1" src="https://ane4bf-datap1.s3-eu-west-1.amazonaws.com/wmocms/s3fs-public/ckeditor/files/heartland.jpg?_9VChaq5GsSuYmqFLLn7p07CL19Fvh8x" style="height: 267px; width: 400px; margin: 15px; float: right;" title="US flooding caused by hurricane Harvey. Photo: US Coast Guard Heartland." typeof="foaf:Image" /></p>

<p>Large parts of southeast Texas saw more than 30-35 inches (762-889 mm) with isolated amounts up to 42 inches (1067 mm) of rain since 24 August. Cedar Bayou in Texas received51.88 inches of rain (1.3 meters), <a href="http://www.wpc.ncep.noaa.gov/discussions/nfdscc1.html">according to the U.S. National Weather Prediction Center.</a></p>

<p> As of 31 August, many areas remained inaccessible and the casualty toll is still rising. Harvey will be one of the costliest natural disasters in US history.  Houston is the fourth largest city in the USA and a major transport, communications and industrial hub.</p>

<p>The relationship between human induced climate change and tropical cyclones is the subject of continuing research. <a href="https://www.climate.gov/news-features/understanding-climate/extreme-event-attribution-climate-versus-weather-blame-game">When an event like this occurs, it is likely that climate change significantly increases the associated rainfall</a>. Sea level rise is also increasing the exposure and vulnerability to tropical cyclones.</p>

<p>Harvey made landfall on the Texas late Friday 25 August as a Category 4 hurricane on the Saffir-Simpson wind-scale before weakening to a tropical storm. Sustained winds were near 130 mph (215 km/h) with higher gusts, destroying buildings and infrastructure. It was the strongest hurricane to hit the United States of America since Hurricane Wilma in 2005.</p>

<p>“This event is unprecedented and all impacts are unknown and beyond anything experienced. Follow orders from officials to ensure safety,” the US National Weather Service tweeted on Sunday 27 August. The National Hurricane Center said the Houston metro received an "<a href="http://www.nhc.noaa.gov/text/WTUS84-KHGX.shtml">unfathomable amount of rainfall</a>" Sunday night.</p>

<p>Harvey brought so much rainfall that the NWS had to update the colour charts on its graphics in order to effectively map it. It now has a greater than 30 inches category (76 cm).  More rain is forecast. Rivers are on the rise and major to record flooding is forecast.</p>

<p><img alt="NASA's IMERG shows rainfall accumulation along Harvey's track" class="media-element file-default" data-delta="2" data-fid="10753" data-media-element="1" src="https://ane4bf-datap1.s3-eu-west-1.amazonaws.com/wmocms/s3fs-public/ckeditor/files/1-nasacalculat.jpg?TV4_QcUzjHaWim.azQMNDTh61xqKDwsk" style="height: 197px; width: 350px; margin: 15px; float: left;" title="NASA's IMERG shows rainfall accumulation along Harvey's track" typeof="foaf:Image" />Harvey was an extremely slow moving tropical storm, increasing the duration and impact of the rainfall and affecting a very large area roughly the size of Spain.</p>

<p>Harvey made landfall again on 30 August  as a tropical storm in Louisiana on 30 August. It then weakened to a tropical depression as it tracked inland, although the threat of life-threatening flooding continued in its wake.</p>

<p>In addition to the hazards from wind and water, caused tornadoes are possible in southeast Texas and southern Louisiana.</p>

<p>Since 2005 and in addition to the Hurricane Wilma, at least 3 major storms and flooding events occurred in the US (Katrina 2005, Sandy 2012 and Harvey 2017). According to statistics, each of them has less than 1% risk of occurring each year.</p>

<p>Damages of events of this magnitude cannot be prevented through dikes or other safety works alone: a combination of preventive actions such as hazard mapping, flood forecast and warning as well as emergency planning are critical. Keys are real time data (weather and rivers), hydrological models, but also well trained experts and seamless communication: between authorities and population, and between different disciplines (meteorology, hydrology, decision makers, civil protection etc).  </p>

<p> </p>

<p><img alt="NHC mesaage after Harvey" class="media-element file-default" data-delta="1" data-fid="10751" data-media-element="1" src="https://ane4bf-datap1.s3-eu-west-1.amazonaws.com/wmocms/s3fs-public/ckeditor/files/Screen_Shot_2017-08-31_at_11.54.38.png?fWpgCSBSHAZSDrdoy6Hd9XLNs5MWGAiQ" style="height: 179px; width: 450px; margin: 15px; float: right;" title="NHC mesaage after Harvey" typeof="foaf:Image" /></p>

<p>Archive of US National Hurricane Center advisories on Harvey <a href="http://www.nhc.noaa.gov/archive/2017/HARVEY.shtml?">here</a></p>

<p>US National Weather Service <a href="http://www.weather.gov/">here</a></p>

<p>NOAA Weather Prediction Center <a href="http://www.wpc.ncep.noaa.gov/discussions/nfdscc1.html">here</a></p>

<p>Federal Emergency Management Agency <a href="https://www.fema.gov/hurricane-harvey?utm_source=hp_promo&amp;utm_medium=web&amp;utm_campaign=disaster">here</a></p>

<p>WMO frequently asked questions on tropical cyclones <a href="https://public.wmo.int/en/About-us/FAQs/faqs-tropical-cyclones">here</a></p>

<p>Associated Programme on Flood Management <a href="http://www.floodmanagement.info/">here</a></p>

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