{"id":218789,"date":"2025-05-24T12:56:08","date_gmt":"2025-05-24T12:56:08","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=218789"},"modified":"2025-05-24T12:56:11","modified_gmt":"2025-05-24T12:56:11","slug":"read-about-hurricane-categories-in-some-hurricane-facts-in-your-textbook","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/24\/read-about-hurricane-categories-in-some-hurricane-facts-in-your-textbook\/","title":{"rendered":"Read about Hurricane Categories in \u201cSome hurricane facts\u201d in your textbook."},"content":{"rendered":"\n<p>Read about Hurricane Categories in \u201cSome hurricane facts\u201d in your textbook. Hurricane Camille was a Category 5 hurricane when it hit Mississippi on August 17, 1969. Camille&#8217;s 190 mph sustained winds at landfall were the highest winds ever recorded for a hurricane hitting the US. On August 29, 2005, Hurricane Katrina hit the same region of the Mississippi coast, making landfall as a Category 3 hurricane with 130 mph sustained winds. Camille&#8217;s eye had an 11 mi diameter eye, and the radius of maximum sustained winds reached approximately 15 miles. Katrina, though, had a larger 37-mile diameter eye, and hurricane-force winds extended out 120 miles to the east of the center. Katrina&#8217;s radius of maximum winds was about 30 miles. Camille drove a record storm surge of 22.6 feet to Pass Christian, Mississippi, while Katrina&#8217;s storm surge exceeded Camille&#8217;s at all locations, topping out at 27.8 feet at Pass Christian (Fritz et al., 2008). With the given information and assuming the flow outside of the hurricane&#8217;s eye is approximated as a free vortex, perform a simple calculation indicating how a Category 3 hurricane&#8217;s storm surge could exceed that of a Category 5. Also discuss wind speeds, pressures, densities, and temperatures at the eye of hurricanes.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Simplified Calculation: Free Vortex Model<\/h3>\n\n\n\n<p>In a <strong>free vortex<\/strong>, tangential wind speed VV is inversely proportional to the distance rr from the center: V\u221d1rV \\propto \\frac{1}{r}<\/p>\n\n\n\n<p>Given:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Camille&#8217;s radius of maximum winds<\/strong>: rC=15r_C = 15 mi, wind speed VC=190V_C = 190 mph<\/li>\n\n\n\n<li><strong>Katrina&#8217;s radius of maximum winds<\/strong>: rK=30r_K = 30 mi<\/li>\n<\/ul>\n\n\n\n<p>Using the free vortex model: VK=VC\u22c5rCrK=190\u22c51530=95&nbsp;mphV_K = V_C \\cdot \\frac{r_C}{r_K} = 190 \\cdot \\frac{15}{30} = 95 \\text{ mph}<\/p>\n\n\n\n<p>However, Katrina\u2019s recorded wind speed was 130 mph, not 95 mph. This suggests Katrina had a <strong>more complex wind field<\/strong> not perfectly modeled by a free vortex, but the model does highlight that <em>larger hurricanes can exert significant forces over a wider area<\/em>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why Katrina\u2019s Surge Was Higher<\/h3>\n\n\n\n<p>Despite Camille\u2019s higher peak wind speed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Katrina had a <strong>larger eye<\/strong> (37 mi vs. 11 mi)<\/li>\n\n\n\n<li>Katrina had <strong>hurricane-force winds extending 120 mi from the center<\/strong>, much farther than Camille<\/li>\n\n\n\n<li>Katrina&#8217;s <strong>radius of maximum winds was twice as large<\/strong>, leading to <strong>greater water displacement over a larger area<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Storm surge depends heavily on <strong>wind field size<\/strong>, <strong>storm size<\/strong>, <strong>duration<\/strong>, <strong>bathymetry<\/strong>, and <strong>coastal shape<\/strong>\u2014not just peak wind speed. Katrina\u2019s expansive wind field and longer duration over water enabled it to pile up more water over time.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Atmospheric Conditions at the Eye<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wind Speed<\/strong>: Drops sharply to near zero at the eye&#8217;s center<\/li>\n\n\n\n<li><strong>Pressure<\/strong>: Lowest in the entire storm system, typically 870\u2013950 mb<\/li>\n\n\n\n<li><strong>Temperature<\/strong>: Warmer in the eye due to sinking air and latent heat release<\/li>\n\n\n\n<li><strong>Density<\/strong>: Lower due to high temperature and low pressure<\/li>\n<\/ul>\n\n\n\n<p>In summary, <strong>storm size and wind field extent<\/strong>\u2014not just category\u2014are crucial in determining storm surge. Katrina\u2019s broad, sustained winds caused more extensive ocean displacement, leading to a higher surge despite lower peak winds.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/05\/image-344.png\" alt=\"\" class=\"wp-image-218790\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Read about Hurricane Categories in \u201cSome hurricane facts\u201d in your textbook. Hurricane Camille was a Category 5 hurricane when it hit Mississippi on August 17, 1969. Camille&#8217;s 190 mph sustained winds at landfall were the highest winds ever recorded for a hurricane hitting the US. On August 29, 2005, Hurricane Katrina hit the same region [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-218789","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/218789","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=218789"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/218789\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=218789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=218789"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=218789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}