|Headquarters||San Francisco, California, U.S.|
|Parent||The Weather Company |
Weather Underground is a commercial weather service providing real-time weather information via the Internet. Weather Underground provides weather reports for most major cities across the world on its website, as well as local weather reports for newspapers and websites. Its information comes from the National Weather Service (NWS), and over 250,000 personal weather stations (PWS). The website is available in many languages, and customers can access an ad-free version of the site with additional features for an annual fee. Weather Underground is owned by The Weather Company, a subsidiary of IBM. 
The company is based in San Francisco, California and was founded in 1995 as an offshoot of the University of Michigan's Internet weather database. The name is a reference to the 1960s militant radical student group the Weather Underground, which also originated at the University of Michigan. 
Jeff Masters, a doctoral candidate in meteorology at the University of Michigan working under the direction of Professor Perry Samson, wrote a menu-based Telnet interface in 1991 that displayed real-time weather information around the world. In 1993, they recruited Alan Steremberg and initiated a project to bring Internet weather into K-12 classrooms. WU's president Alan Steremberg wrote "Blue Skies" for the project, a graphical Mac gopher client, which won several awards. When the Mosaic Web browser appeared, this provided a natural transition from "Blue Skies" to the Web.
In 1995 Weather Underground, Inc. became a commercial entity separate from the university.  It has grown to provide weather for print sources, in addition to its online presence. In 2005, Weather Underground became the weather provider for the Associated Press; WU also provides weather reports for some newspapers (including the San Francisco Chronicle) and the Google search engine.[ citation needed] Alan Steremberg, Weather Underground's president, also worked on the early development of Google's search engine with Larry Page and Sergey Brin. 
In October 2008, Jeff Masters reported that the site was #2 in Internet Weather for 2008. 
In February 2010, Weather Underground launched FullScreenWeather.com, a full screen weather Web tool with integrated mapping and mobile device use in mind.
On July 2, 2012, The Weather Channel announced that it would acquire Weather Underground, which would become operated as part of The Weather Channel Companies, LLC, which was later renamed "The Weather Company". The Weather Underground website continues to operate as a separate entity from The Weather Channel's primary site, weather.com, with its existing staff retained. Third-party web analytics providers Alexa and SimilarWeb rate the site as the 117th and 98th most visited website in the United States respectively, as of July 2015.   SimilarWeb rates the site as the second most visited weather website globally, attracting more than 47 million visitors per month.   The Weather Company also uses the site's San Francisco headquarters as a regional office.  
The website's popularity also helped launch a TV show hosted by meteorologist Mike Bettes, which airs on The Weather Channel from 5 to 8 pm ET (except during storm coverage; in which case the show is extended to 9 pm or 10 pm).
On October 28, 2015, Jeff Masters noted that IBM had officially announced an agreement to acquire The Weather Company’s business-to-business, mobile and cloud-based web properties, including Weather Underground, WSI, weather.com, and also the Weather Company brand. Meanwhile, the television service (The Weather Channel) remains a separate entity, later sold to Entertainment Studios in 2018.  The deal was finalized on January 29, 2016. 
Web logs ( blogs) are one of the main features in Weather Underground, allowing users of the site to create blogs about weather, everyday life and anything else. Jeff Masters started the first blog on April 14, 2005,  and he now posts blog entries nearly every day. Richard B. Rood has been writing blogs on climate change and societal response since 2007, with new entries on a weekly basis.
On October 14, 2016, the Wunderblog announced that it would be changing their name to Category 6, a name which was suggested by Jeff Masters. They decided on the name because it "alludes to our deep fascination with all types of weather and climate extremes, including the many important facets of our changing climate", and "will provide all the insight and expert analysis needed to put the extreme events of our evolving 21st-century climate into context." 
On April 3, 2017 Weather Underground ended all Member blogs, WUMail, SMS alerts, NOAA Weather Radio rebroadcast and Aviation.[ citation needed] As part of this transition, Category 6 will get a new look. All posts by Jeff Masters, Bob Henson and WU featured bloggers will move to Category 6. Users can no longer contact each other or have blogs.
Weather Underground also uses observations from members with automated personal weather stations (PWS).  Weather Underground currently uses observations from over 250,000 personal weather stations worldwide. 
The Weather Underground's WunderMap overlays weather data from personal weather stations and official NWS stations on a Google Map base and provides many interactive and dynamically updated weather and environmental layers.  On November 15, 2017, users were notified via email that their world-wide, user-provided weather cameras would cease to be available on December 15, 2017. However, on December 11th, 2017 users received another email from Weather Underground announcing that they were reversing their position and would not be discontinuing the product based on significant user feedback. 
Weather Underground has several Google Chrome extensions  and applications for iPhone, iPad and Android  including FullScreenWeather.com, a redirect to a full screen weather viewer tied into OpenStreetMap. There is also an app developed for Roku devices. 
In February 2015, Weather Underground released an iOS app called Storm.  This app is universal, and can be used on both iPhone and iPad. Other apps by Weather Underground include WunderStation  for iPad and WunderMap  for iOS and Android. In 2017, Weather Underground removed support for "Storm," in favor of the "Storm Radar" app released by The Weather Channel Interactive in June 2017. |
In March of 2017 Weather Underground stopped providing Doppler Radar Detected Storms on their NEXRAD page and has listed the long standing statement "There are no Doppler radar detected storms for (any area) at this time." Also, when checking the lightning box, there was never any lightning depicted on the radar screen, even when lightning was obviously present. When contacted, IT customer service responded by saying it would be back soon, the company was now focusing on a smart phone app, and that app gives the same Doppler Radar Detected Storms information (not yet found on the app as of 5/19/18), and there was no mention of the lightning data issue. The Doppler Radar Detected Storms information was presented in a very useful format, as each storm was given an identifier that could be looked up by scrolling down to a grid giving details of each storm, i.e.: speed, direction of travel, intensity, hail potential, buildup tops, lateral size, etc. Many service users, including Emergency Weather Management Units, felt this was one of the most important features of Weather Underground, as it could be used as an early warning system alert to help people in the path of inclement weather stay out of harm's way, and potentially minimize property damage. The last year or so Weather Underground seems to have slowly lost functionality and download speed; some say the service has become an afterthought since being purchased by The Weather Channel / IBM. Most loyal users and customers contacted for this report are hoping for a major format upgrade for PCs and laptops, to the previous format, and an increase in download speed.[ citation needed]
- "IBM Finalizes Deal for Weather Channel Product and Tech Business". The Wrap. January 29, 2016.
- Masters, Jeff (28 October 2015). "Weather Underground Bought by IBM". Weather Underground. SBM. Retrieved 2 November 2015.
- Schwartz, John; Stelter, Brian (July 3, 2012). "Fans Howl After Weather Site Buys Out Rival". The New York Times.
- Weather Underground, Inc. The First Internet Weather Service. Retrieved on 2008-04-05.
- Jeff Master's WunderBlog, 10-27-2008 Heavy Internet Weather Retrieved on 2008-10-27.
- "wunderground.com Site Overview". Alexa. Retrieved 30 July 2015.
- "Wunderground.com Analytics". SimilarWeb. Retrieved 30 July 2015.
- "Top 50 sites in the world for News And Media > Weather". SimilarWeb. Retrieved 30 July 2015.
- Weather Channel buys Weather Underground, brand stays. PaidContent.org. Retrieved July 4, 2012.
- Dr. Jeff Masters' WunderBlog: Wunderground.com sold to The Weather Channel Companies, Weather Underground, July 2, 2012.
- "Weather Underground Bought by IBM, by Dr. Jeff Masters, October 28, 2015".
- Weather Underground, Inc. Dr. Jeff Masters' WunderBlog. Retrieved on 2008-04-05.
- "Our New Name: Category 6™". Weather Underground. October 14, 2016. Retrieved October 15, 2016.
- Weather Underground, Inc. Personal Weather Station. Retrieved on 2008-04-05.
- Weather Underground, Inc. Personal Weather Station Network. Retrieved on 2017-02-20
- Weather Underground, Inc. WunderMap Retrieved on 2015-02-01.
- "Wunderground.com". Retrieved 2017-12-07.
- WEATHER UNDERGROUND For The Associated Press. Weather Search Retrieved on 2009-10-28.
- "Weather Underground - Chrome Web Store". Chrome.google.com. Retrieved 2015-05-14.
- "Weather Underground - Android Apps on Google Play". Play.google.com. Retrieved 2015-05-14.
- "Weather Underground for Roku". Wunderground.com. Retrieved 2015-05-14.
- "Storm by Weather Underground | Weather Underground". Wunderground.com. Retrieved 2015-05-14.
- "WunderStation by Weather Underground | Weather Underground". Wunderground.com. Retrieved 2015-05-14.
- "WunderMap® by Weather Underground". Wunderground.com. Retrieved 2015-05-14.
- "Storm Radar FAQ". Wunderground.com. Retrieved 2017-11-18.