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   <title>About.com Weather: What's Hot Now</title>
   <link>http://weather.about.com/</link>
   
      <description>These articles that had the largest increase in popularity over the last week</description>
      <language>en-us</language>
      <pubDate>Wed, 25 Nov 2009 10:09:07 +0000</pubDate>
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         <item>
            <title><![CDATA[Cloud Symbols]]></title>
            <link>http://weather.about.com/library/Clouds/bl_cloud_symbols.htm</link>
            <description><![CDATA[High, Middle, and Low cloud species listed in a table format link to pictures of the different types of clouds.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Raindrops and Burgers?]]></title>
            <link>http://weather.about.com/od/cloudsandprecipitation/a/rainburgers.htm</link>
            <description><![CDATA[The shape of raindrops is a common weather misconception. Rain is not shaped like a teardrop. Contrary to popular belief, raindrops are shaped more like hamburger buns. ]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[What is Lake Effect Snow?]]></title>
            <link>http://weather.about.com/od/weatherfaqs/f/lakeeffectsnow.htm</link>
            <description><![CDATA[What is the difference between a lake effect snow storm and a regular winter storm? All of your weather questions are answered here! Learn the weather terms from your local news channel as you learn to prepare for lake effect snow storm squalls!]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Wind Shear]]></title>
            <link>http://weather.about.com/od/w/g/windshear.htm</link>
            <description><![CDATA[Wind Shear definition is presented along with evidence and new research on preventing aviation accidents based on NASA technology. The role of wind shear in hurricane development is also discussed.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[What&#039;s the Hottest Year Ever?]]></title>
            <link>http://weather.about.com/od/climatechange/a/HottestYears.htm</link>
            <description><![CDATA[The Race for the Title of Warmest Year on Record. Was this a warmer year than average? What are the 25 warmest years on record? Find out now as you delve into the weird weather experienced throughout most of the United States and globally. You will find data sources for educational and research purposes as well as an explanation behind the increased temperatures experienced over the last 50 years. This historical climate record will rank order the hottest average temperatures in the US.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[1800s Weather Service History]]></title>
            <link>http://weather.about.com/od/weatherhistory/tp/Signal_Service.01.htm</link>
            <description><![CDATA[Weather history and the development of the National Weather Service is examined in a list of the development of meteorological institutions in the United States.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[The Fujita Scale]]></title>
            <link>http://weather.about.com/od/tornadoe1/ss/fujita_7.htm</link>
            <description><![CDATA[Dorothy was an actual scientific instrument used to study tornadoes. Similar to the DOT used in the movie Twister, Dorothy actually does esist and was used to study how tornadoes form.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Calculating the Heat Index]]></title>
            <link>http://weather.about.com/od/under10minutes/ht/calcHI.htm</link>
            <description><![CDATA[The Heat Index is a tool used my meteorologists. You know it is hot, but is it a dry heat? Are you in danger of heat stroke? Use an online calculator to calculate Heat Index. Advanced heat index equations are available, or plug some numbers in for the temperature and humidity and you will know if you need to go inside on that hot summer day!]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Climate and Atmosphere Lessons]]></title>
            <link>http://weather.about.com/od/lessonplanselementary/qt/free_nasa_core.htm</link>
            <description><![CDATA[Climate Lessons and Atmosphere Lessons - Get the information you need for free bulletin board sets from NASA on the weather. The fleet of satellites at NASA catch interesting and beautiful earth views from space that teach us lessons on the atmosphere, climate, and weather. Find out how to get your free lessons here.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Air Pressure Experiment]]></title>
            <link>http://weather.about.com/od/lessonplanshighschool/a/atmpressureexp.htm</link>
            <description><![CDATA[Teachers looking for weather lesson plans will love this science experiment on air pressure. The original lesson is exciting and hands-on allowing for development of the science process skills.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Hurricane Katrina Stories]]></title>
            <link>http://weather.about.com/od/hurricanes/tp/KatrinaStories.htm</link>
            <description><![CDATA[The devastation of Katrina will leave few to doubt that hurricanes are one of nature&amp;#146;s most destructive forces. Here, victims and rescue workers tell their tales of heroism and survival.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[How Weather Changed History]]></title>
            <link>http://weather.about.com/od/meteorologyandsociety/ss/weatherhistory_6.htm</link>
            <description><![CDATA[History changes as a result of key weather events. From the Hindenburg to Bubonic Plague to the Challenger accident and more, you will learn the role of weather in changing historical events. This exciting tour will lead you through 10 events that changed the course of history! A great addition to a history and science integration lesson plan for educators!]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[California - Holiday White Christmas Weather Forecasts]]></title>
            <link>http://weather.about.com/od/cloudsandprecipitation/l/bl_californiachristmas.htm</link>
            <description><![CDATA[Have you ever wondered what the chances are for a White Christmas in your state or city? Here is a list of holiday forecasts for a blanket of snow on December 25th for selected cities in every state in the US. The winter weather may produce an abundance of snow in your area. Check it out now.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Ambient Temperature]]></title>
            <link>http://weather.about.com/od/a/g/ambient.htm</link>
            <description><![CDATA[Ambient temperature is defined in the weather glossary.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Chances of a White Christmas]]></title>
            <link>http://weather.about.com/od/meteorologyandsociety/a/WhiteChristmas.htm</link>
            <description><![CDATA[White Christmas - It is not just Bing Crosby wishing for a White Christmas! Of Everyone that celebrates Christmas (especially in the North) the often asked question is whether there will be snow on the ground for Christmas morning. Here, I present holiday forecast predictions for snow depth on December 25th.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Frontal System Symbols]]></title>
            <link>http://weather.about.com/od/forecastingtechniques/ss/frontsymbols_4.htm</link>
            <description><![CDATA[Cold fronts cause warm air to be pushed upwards. This can cause severe storms depending on the conditions in the air masses.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Weather Animations]]></title>
            <link>http://weather.about.com/od/educationalmaterials/tp/weather_animations.04.htm</link>
            <description><![CDATA[Weather animations can provide easy lessons on various weather topics including cloud types, hurricane formation, tornado formation, layers of the atmosphere, climate change, and more.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Surviving Hurricane Ivan]]></title>
            <link>http://weather.about.com/od/submityourstory/a/ivanstory.htm</link>
            <description><![CDATA[Author Michielle Beck tells her tale of survival during Hurricane Ivan on weather.about.com, the site for up-to-date weather news and information for teachers, students, and the community. Get educated and explore your earth environment!]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Tornadoes Introduction]]></title>
            <link>http://weather.about.com/od/tornadoe1/ss/tornadointro_3.htm</link>
            <description><![CDATA[When is your state likely to get hit by a tornado? Look at the data to determine your danger zone for tornado damages.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Hurricane Tracking Charts]]></title>
            <link>http://weather.about.com/od/hurricaneformation/qt/tracking_charts.htm</link>
            <description><![CDATA[Hurricane tracking charts are used to track the path of a hurricane. Computer generated versions of the hurricane maps are produced daily, but students and teachers can also use these blank maps in the classroom.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[How to be a Storm Chaser]]></title>
            <link>http://weather.about.com/od/meteorologyandsociety/a/stormchasercars.htm</link>
            <description><![CDATA[How to be a storm chaser is one of the most frequently asked questions I receive. Read an exciting interview with a real-life storm chaser! Chris Caldwell is a participant in the annual storm chaser car show at the National Weather Festival in Oklahoma and he has great stories to tell and advice on becoming a storm chaser.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[The White Christmas Quiz]]></title>
            <link>http://weather.about.com/library/Quiz/bl_christmas_quiz_display.htm</link>
            <description><![CDATA[Test your knowledge of Christmas weather all across the United States.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Hail]]></title>
            <link>http://weather.about.com/od/h/g/hail.htm</link>
            <description><![CDATA[What causes hailstones to form during a severe weather event? These tiny ice balls can cause damages to cars and property and have even been known to kill. So how do golf ball sized hailstones form in the atmosphere? Find out here!]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Will It Be a White Christmas?]]></title>
            <link>http://weather.about.com/od/meteorologyandsociety/tp/WhiteChristmasList.01.htm</link>
            <description><![CDATA[Will it be a white Christmas? It is not just Bing Crosby wishing for a White Christmas! Of Everyone that celebrates Christmas (especially in the North) the often asked question is whether there will be snow on the ground for Christmas morning. Here, I present holiday forecast predictions for snow depth on December 25th.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[SAM Weather Curriculum]]></title>
            <link>http://weather.about.com/od/lessonplanshighschool/a/sam.htm</link>
            <description><![CDATA[Student activities in meteorology or SAM are a series of National Standard aligned lessons offered by NOAA. Each lesson teaches about topics including Doppler radar, tornadoes, lightning, wind chill, humidity, the disappearing ozone, global warming, and more.]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[Earth&#039;s Climate Changes]]></title>
            <link>http://weather.about.com/od/climatechange/i/coolingearth.htm</link>
            <description><![CDATA[Evidence from multiple sources indicate the earth is warming due to increases in greenhouse gases. Political statements and confusion in reading scientific graphs and research have caused a lot of hot button arguments about earth's climate change. ]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[ Barometer Diagram]]></title>
            <link>http://weather.about.com/od/imagegallery/ig/Weather-Image-of-the-Day/Barometer-Diagram.htm</link>
            <description><![CDATA[A barometer measures atmospheric pressure by balance the weight of mercury in a glass tube against the weight of air in the atmosphere. ]]></description>
            <category>education</category>
         </item>
         
         <item>
            <title><![CDATA[ Name That Weather Front Symbol]]></title>
            <link>http://weather.about.com/od/imagegallery/ig/Weather-Map-Symbols/Weather-Symbols---Fronts.htm</link>
            <description><![CDATA[weather maps symbols fronts cold warm occluded stationary stationery]]></description>
            <category>education</category>
         </item>
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