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<title>	How much rain will Hurricane Harvey bring to New Orleans, and when? | 						NOLA.com</title>


	
	

	
	
	
	
																									
	

	
																									

	
		
	
	
	

	
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            By <a id="byline__authorLink" href="http://connect.nola.com/user/jenlarino/posts.html" title="Visit Jennifer Larino's Author Page">Jennifer Larino</a></p>
    
        <p id="byline__authorEmail" class="byline__authorEmail"><a id="byline__authorEmailLink" href="mailto:jlarino@nola.com" title="Email Jennifer Larino">jlarino@nola.com</a>,</p><p id="byline__authorAffiliation" class="byline__authorAffiliation">NOLA.com | The Times-Picayune</p>
        
    
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        <p>Current forecasts don't put Louisiana&nbsp;in&nbsp;<a href="https://topics.nola.com/tag/tropical%20storm%20harvey/">Hurricane Harvey</a>'s direct path, but the storm&nbsp;is likely to send out waves of tropical rainfall over the next week that could douse New Orleans and surrounding areas. Exactly how much rain can we expect and when?</p>
<p>The short -- and most conservative -- answer is that it is still too early to get a good read on rainfall amounts in Louisiana&nbsp;before seeing what the storm does once it hits Texas. Harvey is expected to make landfall as a Category 3 hurricane sometime late Friday (Aug. 25) or early Saturday.</p>
<p><a href="http://www.nola.com/hurricane/index.ssf/2017/08/where_is_tropical_storm_harvey.html#incart_2box" data-enhanced="small"></a></p>
<p>Still, forecasters have started to come forward with predictions.</p>
<p>An early forecast map released Thursday by the National Weather Service shows the New Orleans area could see 4 to 6 inches of rain over the next week. That compares with 10 to 15 inches of rain for parts of southwest Louisiana that sit on the Texas border, and 12 to 20 inches in areas directly in the path of the storm. Parts of Texas could get as much as 35 inches of rain.</p>
<p>Forecasters predict New Orleans could start to see some rain related to Harvey as early as Saturday night. The rain will start to increase Sunday night and is likely to continue through Wednesday.</p>
<p>Here is a rough timeline based on the latest info from the National Weather Service:</p>
<ul>
<li><strong>Saturday</strong> - Less than half an inch of rain forecast for the New Orleans area as Harvey hits the middle Texas coast.</li>
<li><strong>Sunday and Monday</strong> - Bands of tropical rainfall begin to move&nbsp;across the Louisiana coast. Between 1.5 and 2 inches of rainfall expected in the greater New Orleans area.</li>
<li><strong>Tuesday and Wednesday</strong> - The local rainfall potential increases as Harvey moves northeast. Some forecast models show Harvey re-emerging briefly in the Gulf of Mexico, though there is still uncertainty about the storm's path after landfall. An additional 3 to 4 inches of rain is forecast for the New Orleans area, with the possibility of localized bands dumping as much as 8 inches.</li>
</ul>
<p>Normally, 4 to 6 inches of rainfall resulting from a distant storm would be less of a concern for New Orleans. Recent problems with the city's system of drainage pumps, however, have elevated the threat of street flooding in many neighborhoods.</p>
<p>Mayor Mitch Landrieu said city officials are preparing for 5-10 inches of rainfall starting Sunday and lasting over several days.</p>
<div id="asset-23294004" class="entry_widget_full entry_widget_"><span class="adv-photo-full"><a href="http://media.nola.com/hurricane_impact/photo/harvey rainbow moving GIF.gif" target="_blank" class="full-size-popup"><img src="/static/common/img/blank.gif" class="lazy adv-photo" data-position="article-full" data-original="http://media.nola.com/hurricane_impact/photo/23294004-standard.gif" alt="harvey rainbow moving GIF"></a><span class="photo-data"><span class="byline">National Hurricane Center</span></span></span>&nbsp;</div>
<p>WVUE Fox 8 Chief Meteorologist David Bernard told NOLA.com | The Times-Picayune the direction Harvey takes after it makes landfall in Texas will change how much rain New Orleans gets.</p>
<p>Right now, a high pressure area in the eastern Gulf of Mexico is pushing Harvey forward, while a separate high pressure trough over the southwest of Mexico is expected to push against the storm's forward momentum as it nears landfall. Bernard said several models show Harvey "getting stuck" on the Texas coast over the weekend, spinning in place and continuing to generate rainfall over the Texas coast.</p>
<p>From there, the high pressure area over the Mexican desert could either overpower the storm and push it southward, or a jet stream from the north could pull it eastward. The second path would be bad news for Louisiana, potentially dragging the storm back over Gulf waters where it can gain strength and bring more and heavier rainfall to our area.</p>
<p><a href="http://www.nola.com/weather/index.ssf/2017/08/tropical_storm_harvey_new_orle.html#incart_2box" data-enhanced="small"></a></p>
<p>Bernard said the "uncertainty is too high" to pinpoint rainfall totals as far out as next week, but predicts New Orleans could see anywhere from 1 to 6 inches of rain by late Sunday night.</p>
<p>"It seems for southeast Louisiana the two big threats are the potential for flooding rains next week and also coastal flooding outside the risk reduction system," Bernard said, adding the forecast should be clearer by Saturday.</p>
<p>The <a href="http://National Hurricane Center ">National Hurricane Center</a>&nbsp;has warned of "life-threatening and devastating flooding" across the Texas coast, but has yet to issue any warnings for Louisiana.</p>
<p>Louisiana Gov. John Bel Edwards <a href="http://www.nola.com/politics/index.ssf/2017/08/louisiana_hurricane_harvey.html#incart_2box">declared a state of emergency </a>Thursday ahead of Hurricane Harvey, a measure he described as precautionary amid rising concerns about flooding and the potential for the storm to drift toward Louisiana.</p>
<p>Here in New Orleans contractors have been working to bring 15 of the city's 120 pumps back into operation. The pumps were either not running or were running at lower capacity during recent flooding.</p>
        
        
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