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    </style><div class="headerBannerContainer"><div class="headerBanner"><h2>Complete coverage of Hurricane Irma, a monster storm that struck Florida</h2></div></div></div><body id="article_0"><section id="article-sec_0"><!--[if lte IE 8 ]><div class="article_section"><![endif]--><div id="article_0" class="article_elements  medium   "><style>
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</style><div id="tve_cta"><div class="tve_cta_container"><a href="/live"><span class="play"><img src="//media.nbcmiami.com/images/tve-play-icon.png" /></span><div class="tve_onNow">WATCH LIVE</div><div class="tve_show_onnow"><h2><span id="tve_cta_showTitle">2018 Winter Olympics</span></h2><h3 id="tve_cta_showDek">Speed skating (men's 1500m gold medal final); luge (women's singles); cross-country skiing.</h3></div></a></div><span class="close_cta"></span></div><!--startclickprintinclude--><article id="article_0_elements"><div id="article_0_headline_byline" class="headline_region"><h1 class="headline" itemprop="headline">What to Know About Irma and How Hurricanes Work</h1><h2 class="subtitle">Until Harvey last month, no major hurricane had hit the United States since 2005</h2><h3 class="byline"> By
                                                                                       <a href="/results/?keywords=%22Seth+Borenstein%22&byline=y&sort=date">Seth Borenstein</a></h3><h3 class="dateline" style="font-family: Roboto;font-size: 0.8em;color: #969696;margin: 10px 0;font-weight: 300;padding-left: 5px;">Published at 7:49 AM PDT on Sep 7, 2017 | Updated at 8:00 AM PDT on Sep 7, 2017</h3><!--endclickprintinclude--><script type="application/ld+json">

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	</script></div></div></div><figure><div class="leadMediaRegion video"><div id="nextUp0" class="nextUpCard" style="display:none;"><span class="upNextTitle"> UP NEXT </span><img width="84" height="50"><div class="upNextSlate"></div><span class="openTab"></span><span class="closeButton">X</span></div><div id="endcard" style="display:none;"><div id="backplate"></div><div id="topRegion"><div id="backplateTop"></div><div class="items"><p class="videoTitle">Fact or Fiction: Hurricane Myths Busted</p><ul id="socialTools"><li id="endcardShareBtns"></li></ul><ul id="additionalShare"><li class="shareLink"><span>Link</span></li><li class="shareEmbed"><span>Embed</span></li></ul></div></div><div class="shareBoxes"><div class="linkBox" style="visibility:hidden;"><div class="boxCopy boxBtn"><span>Copy</span></div><div class="boxClose boxBtn"><span>Close</span></div><p class="boxLabel"> Link to this video </p><form action="#"><fieldset><textarea rows="1" cols="2" readonly="readonly">http://www.nbcsandiego.com/news/national-international/Why-Irma-is-So-Strong-and-Other-Questions-About-Hurricanes-442954943.html</textarea></fieldset></form></div><div class="embedBox" style="visibility:hidden;"><div class="boxCopy boxBtn"><span>Copy</span></div><div class="boxClose boxBtn"><span>Close</span></div><p class="boxLabel"> Embed this video </p><form action="#"><fieldset><textarea rows="1" cols="2" readonly="readonly"><script type="text/javascript" charset="UTF-8" src="http://www.nbcsandiego.com/portableplayer/?cmsID=442947933&videoID=uSG0DU7YLn09&origin=nbcsandiego.com&sec=news&subsec=national-international&width=600&height=360"></script></textarea></fieldset></form></div></div><p class="replayButton"><a href="#" onclick="return false;">Replay</a></p><div id="bottomRegion"><div id="backplateBottom"></div><div class="items"><p class="related"> More videos (1 of 9)</p><div class="relatedVideos"><ul class="videoBox"></ul></div><span class="pager prev">&laquo;</span><span class="pager next">&raquo;</span></div></div></div><div id="leadVideo0" class="leadMediaThumbnail video" data-ap="true" data-sponsor="" data-cid="442947933" data-vid="uSG0DU7YLn09" data-title="Fact or Fiction: Hurricane Myths Busted" data-thumb="https://media.nbcsandiego.com/images/144*82/hurricane+myth.JPG"><div class="videoPlayButton medium"></div><h3 class="leadMediaTitle">Fact or Fiction: Hurricane Myths Busted</h3><div class="videoOverlay"></div><img src="https://media.nbcsandiego.com/images/652*370/hurricane+myth.JPG"></div></div><script>
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          </script><figcaption><!--startclickprintinclude--><div class="leadMediaCaption"><p>As Hurricane Irma approaches, it's important to stay up to date with the latest information-- but there are a lot of rumors out there.</p> (Published Wednesday, Sept. 6, 2017)</div><!--endclickprintinclude--></figcaption><div id="tbFilmStrip"  style="width:622px; height:169px; background-color:#eee; overflow: hidden;position: relative; padding:16px; margin-left:16px;"><div id="tbFilmStripCarousel" style="overflow:hidden;"></div></div><script>
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                          </script></figure><!--startclickprintinclude--><div id="at_0" class="articleText" itemprop="articleBody"><p class="paragraph" data-pnum="1">A powerful Hurricane Irma is threatening millions of people in the Caribbean and Florida. Some answers to questions about Irma and hurricanes:</p><p class="paragraph" data-pnum="2"><div class="embedded cm embed  centerModule " data-cid="442754363"><p><style type="text/css">
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document.write("<div id='customMod-1' class='footerCirculationMod'><h2>Get the latest on Hurricane Irma from NBC 6 anywhere, anytime</h2><ul><li class='app-recirc'><img height='47' width='47' src='https://media.nbcmiami.com/images/miami-icon.png' alt='NBC Miami' /><h3>Download the App</h3>Available for <a href='https://itunes.apple.com/us/app/nbc-6/id331807842?mt=8'>iOS</a> and <a href='https://play.google.com/store/apps/details?id=com.nbcuni.nbcots.nbcmiami.android&amp;hl=en'>Android</a></li></ul></div>");
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</script></p></div></p><p class="paragraph" data-pnum="3"><b>WHERE DO THESE STORMS COME FROM?</b><br>Irma is a classic Cape Verde storm, which begin near the islands off the west coast of Africa. Some of the worst hurricanes start as puffs of unstable air and storminess there and chug west, gaining strength over the warm open Atlantic. Another storm, Jose, has followed in Irma's footsteps. Some of those storms fizzle from wind shear or other weather conditions. Still others curve harmlessly north into the mid-North Atlantic and are called "fish storms." Storms also start in the Gulf of Mexico, like Katia which formed off Mexico and was declared a hurricane on Wednesday.</p><p class="paragraph" data-pnum="4"><b>WHY ARE STORMS HAPPENING NOW?<br></b>Hurricane season starts June 1 and ends Nov. 30. That's usually when the water is warm enough and other weather conditions are conducive to storm formation. Hurricanes need water that's at least 79 degrees (26 degrees Celsius). Peak hurricane season is from mid-August to mid-October with the peak of the peak being Sept. 10 or 11.</p><p class="paragraph galVidEmbed-C " data-pnum="5"><span class="embeddedWrapper"><span class="embedded  vertical gallery C" data-cid="442922273" data-permloc="//www.nbcsandiego.com/news/national-international/Hurricane-Irma-Lashes-Through-Caribbean-South-Florida-442922273.html" data-title="In Photos: Hurricane Irma Lashes Through the Caribbean"><a href="//www.nbcsandiego.com/news/national-international/Hurricane-Irma-Lashes-Through-Caribbean-South-Florida-442922273.html"><span class="videoOverlay"></span></a><span class="galleryMask"><img alt="In Photos: Hurricane Irma Lashes Through the Caribbean" src="https://media.nbcsandiego.com/images/620*349/AP_172527248703821.jpg" width="100%"></span><a href="//www.nbcsandiego.com/news/national-international/Hurricane-Irma-Lashes-Through-Caribbean-South-Florida-442922273.html"><span class=" largeTitle ">In Photos: Hurricane Irma Lashes Through the Caribbean</span></a><a href="//www.nbcsandiego.com/news/national-international/Hurricane-Irma-Lashes-Through-Caribbean-South-Florida-442922273.html"><span class="icon gallery"></span></a></span></span></p><p class="paragraph" data-pnum="6"><b>WHAT'S AN AVERAGE SEASON LIKE?<br></b>An average season produces 12 named storms, according to the National Weather Service. Wednesday's Katia is the 11th this season. Storms get names when winds reach 39 mph. The average season produces six hurricanes and three of those become major at 111 mph winds or higher. So far this year, there have been six hurricanes: two major ones, Harvey and Irma; two new ones Wednesday, Katia and Jose; and Franklin and Gert.</p><p class="paragraph" data-pnum="7"><b>DID FORECASTERS SEE THIS BUSY YEAR COMING?<br></b>Yes. In May, the weather service predicted a 70 percent likelihood of 11 to 17 named storms with 5 to 9 becoming hurricanes. They predicted 2 to 4 major hurricanes. In early August, it was changed to a 60 percent chance of 14 to 19 named storms, 5 to 9 hurricanes and 2 to 5 major hurricanes.</p><p class="paragraph galVidEmbed-C " data-pnum="8"><span id="embeddedVideo01" class="embedded video C" data-cid="442927043" data-vid="kDjociJO5oyg"><span class="leadMediaTitle ">Watching Irma From International Space Station</span><span class="videoPlayButton large"></span><span class="videoOverlay"></span><img alt="Watching Irma From International Space Station" src="https://media.nbcsandiego.com/images/620*349/DIT_NAT_ISS_HURRICANE_IRMA_090617_1-150473083327800002.jpg" /></span><div class="embeddedMediaCaption medium "><div><p>NASA provided incredible views from the International Space Station of Hurricane Irma passing through the Caribbean.</p></div><span class="pub">(Published Thursday, Sept. 7, 2017)</span></div></p><p class="paragraph" data-pnum="9"><b>ARE BACK-TO-BACK BIG HURRICANES UNUSUAL?<br></b>Major storms can and do form back-to-back and did so last year with Matthew and Nicole, but having more than one hit the U.S. in a season is strange. If Irma hits Florida as a category 4 or 5 storm, it will be the first time in historical record that the U.S. was hit by two category 4 or 5 storms in one year, said Colorado State University meteorology professor Phil Klotzbach.</p><p class="paragraph" data-pnum="10"><b>WHY IS IRMA SO STRONG?<br></b>Hurricanes use warm water as fuel. Irma has been over water that is 1.2 to 1.8 degrees (0.7 to 1 degree Celsius) warmer than normal. And that warm water goes deeper than usual. High altitude winds, which can fight or even decapitate storms, are not strong, also helping Irma. While over the open Atlantic Ocean on Tuesday, Irma's 185 mph winds set a record for that region. In the entire Atlantic, Caribbean, and Gulf of Mexico, only Hurricane Allen in 1980 was stronger with 190 mph winds. Others with 185 mph winds: a 1935 Florida storm, 1988's Gilbert, and 2005's Wilma.</p><p class="paragraph galVidEmbed-C " data-pnum="11"><span class="embeddedWrapper"><span class="embedded  vertical gallery C" data-cid="396207901" data-permloc="//www.nbcsandiego.com/news/national-international/Five-Deadliest-Hurricanes-Hit-United-States-Since-1900-396207901.html" data-title="The 5 Deadliest Hurricanes to Hit the US Since 1900"><a href="//www.nbcsandiego.com/news/national-international/Five-Deadliest-Hurricanes-Hit-United-States-Since-1900-396207901.html"><span class="videoOverlay"></span></a><span class="galleryMask"><img alt="The 5 Deadliest Hurricanes to Hit the US Since 1900" src="https://media.nbcsandiego.com/images/620*349/GettyImages-3242810.jpg" width="100%"></span><a href="//www.nbcsandiego.com/news/national-international/Five-Deadliest-Hurricanes-Hit-United-States-Since-1900-396207901.html"><span class=" largeTitle ">The 5 Deadliest Hurricanes to Hit the US Since 1900</span></a><a href="//www.nbcsandiego.com/news/national-international/Five-Deadliest-Hurricanes-Hit-United-States-Since-1900-396207901.html"><span class="icon gallery"></span></a></span></span><br></p><p class="paragraph" data-pnum="12"><b>HOW UNUSUAL IS IRMA?<br></b>This is only the second time since satellite-tracking began about 40 years ago that one maintained 185 mph winds for more than 24 hours, said Klotzbach. The other was the massive killer typhoon Haiyan that killed more than 6,000 people in the Philippines in 2013.</p><p class="paragraph" data-pnum="13"><b>IS THIS GLOBAL WARMING?<br></b>Scientists take weeks or months to conduct intricate studies, using computer simulations, to see if a storm was worsened by man-made climate change. There have been a limited number of hurricanes since record-keeping began in 1851, which makes it difficult to do robust statistical analyses. However, scientists have long said future global warming would make some of the worst storms stronger and wetter and recently have linked climate change to future rapid intensification of storms. There's been scientific debate over whether global warming means more storms, but the stronger and wetter is generally accepted by scientists.</p><p class="paragraph galVidEmbed-C " data-pnum="14"><span id="embeddedVideo02" class="embedded video C" data-cid="442956863" data-vid="KR1bshxlB0t5"><span class="leadMediaTitle ">Plane Travels Through Bands of Irma on Last Flight out of PR</span><span class="videoPlayButton large"></span><span class="videoOverlay"></span><img alt="Plane Travels Through Bands of Irma on Last Flight out of PR" src="https://media.nbcsandiego.com/images/621*349/Plane_Travels_Through_Bands_of_Irma_on_Last_Flight_out.jpg" /></span><div class="embeddedMediaCaption medium "><div><p>People scrambled to get out of Puerto Rico as they boarded the last flight out of the country that is in the line of Hurricane Irma. Gus Rosendale reports.&nbsp;</p></div><span class="pub">(Published Thursday, Sept. 7, 2017)</span></div></p><p class="paragraph" data-pnum="15"><b>WASN'T THERE A HURRICANE DROUGHT?<br></b>In the U.S., yes. Until Harvey last month, no major hurricane had hit the United States since Wilma. That 2005 storm also was the last major hurricane to hit Florida. Scientists say the 12-year landfall drought was likely chance. There were still the same number of hurricanes brewing, they just missed the United States or were not major hurricanes. During that span, Superstorm Sandy was a minor hurricane in terms of wind speed but catastrophic in damage when it hit in 2012.</p><p class="paragraph" data-pnum="16"><b>HOW ARE STORMS FORECAST?<br></b>Forecasters at the National Hurricane Center rely on dozens of computer simulations and their own expert experience. They use real-time readings of wind, temperature, air pressure, humidity and more. But those real-time readings are sparse and spread out. Figuring out a storm's path and strength is tricky and usually forecasts do go out farther than five days.</p><div class="articleAutoFooter"></div><h5 class="copyright">

    
        
    
                
                  
      

		
			
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